Add Core Cache API Support #53

Open
Task
Open
Add Core Cache API Support#53
Task
Milestone
Alpha

Description

@posborne
posborne
opened on Feb 20, 2026

Overview

Add support for Fastly's Core Cache API, providing advanced caching capabilities with request collapsing, stale-while-revalidate, and streaming.

WIT Interface

interfacecache {
usetypes.{error};
usehttp-body.{body};
usehttp-req.{request};
useasync-io.{pollableaspending-entry};
resourceentry {
lookup:static func(key:list<u8>, options:lookup-options) ->result<entry, error>;
transaction-lookup:static func(key:list<u8>, options:lookup-options) ->result<entry, error>;
transaction-lookup-async:static func(key:list<u8>, options:lookup-options) ->result<pending-entry, error>;
transaction-insert:func(options:write-options) ->result<body, error>;
transaction-insert-and-stream-back:func(options:write-options) ->result<tuple<body, entry>, error>;
transaction-update:func(options:write-options) ->result<_, error>;
get-state:func() ->result<lookup-state, error>;
get-user-metadata:func(max-len:u64) ->result<option<list<u8>>, error>;
get-body:func(options:get-body-options) ->result<body, error>;
get-length:func() ->result<option<object-length>, error>;
get-max-age-ns:func() ->result<option<duration-ns>, error>;
get-stale-while-revalidate-ns:func() ->result<option<duration-ns>, error>;
get-age-ns:func() ->result<option<duration-ns>, error>;
get-hits:func() ->result<option<cache-hit-count>, error>;
transaction-cancel:func() ->result<_, error>;
}
resourcereplace-entry {
replace:static func(key:list<u8>, options:replace-options) ->result<replace-entry, error>;
get-age-ns:func() ->result<option<duration-ns>, error>;
get-body:func(options:get-body-options) ->result<option<body>, error>;
get-hits:func() ->result<option<cache-hit-count>, error>;
get-length:func() ->result<option<object-length>, error>;
get-max-age-ns:func() ->result<option<duration-ns>, error>;
get-stale-while-revalidate-ns:func() ->result<option<duration-ns>, error>;
get-state:func() ->result<option<lookup-state>, error>;
get-user-metadata:func(max-len:u64) ->result<option<list<u8>>, error>;
}
typeobject-length = u64;
typeduration-ns = u64;
typecache-hit-count = u64;
resourceextra-lookup-options {
constructor();
}
recordlookup-options {
request-headers:option<borrow<request>>,
always-use-requested-range:bool,
extra:option<borrow<extra-lookup-options>>,
}
resourceextra-write-options {
constructor();
}
recordwrite-options {
max-age-ns:duration-ns,
request-headers:option<borrow<request>>,
vary-rule:option<string>,
initial-age-ns:option<duration-ns>,
stale-while-revalidate-ns:option<duration-ns>,
surrogate-keys:option<string>,
length:option<object-length>,
user-metadata:option<list<u8>>,
edge-max-age-ns:option<duration-ns>,
sensitive-data:bool,
extra:option<borrow<extra-write-options>>,
}
resourceextra-get-body-options;
recordget-body-options {
%from:option<u64>,
to:option<u64>,
extra:option<borrow<extra-get-body-options>>,
}
flagslookup-state {
found,
usable,
stale,
must-insert-or-update,
usable-if-error,
}
resourceextra-replace-options {
constructor();
}
enumreplace-strategy {
immediate,
immediate-force-miss,
wait,
}
recordreplace-options {
request-headers:option<borrow<request>>,
replace-strategy:option<replace-strategy>,
always-use-requested-range:bool,
extra:option<borrow<extra-replace-options>>,
}
insert:func(key:list<u8>, options:write-options) ->result<body, error>;
await-entry:func(handle:pending-entry) ->result<entry, error>;
close-pending-entry:func(handle:pending-entry) ->result<_, error>;
close-entry:func(handle:entry) ->result<_, error>;
replace-insert:func(handle:replace-entry, options:write-options) ->result<body, error>;
close-replace-entry:func(handle:replace-entry) ->result<_, error>;
}

WIT bindings: stubs/wit_world/imports/cache.py

API Design

  • Implement CacheEntry resource wrapper for cache operations
  • Support lookup and transaction-based caching patterns
  • Implement LookupOptions and WriteOptions dataclasses
  • Provide access to cache metadata: age, TTL, hits, state flags
  • Transaction methods: transaction_lookup(), insert(), update(), cancel()
  • Entry body should implement io.IOBase for streaming (similar to KV Store)
  • get_body() returns file-like object that can be read in chunks or passed to stdlib functions

Cross-SDK Comparison: All SDKs provide lookup(), insert(), transaction_lookup() with similar semantics. Rust uses strong typing for state/options enums, Go uses simple structs, JS uses async/Promise-based API. Python should support both blocking operations and context managers for transactions.

Viceroy Testing

Viceroy's cache implementation is limited/stubbed. Testing focus should be on:

  • Verifying hostcall invocations work correctly
  • Testing SDK wrapper logic (option parsing, state flag handling, error mapping)
  • Ensuring body streaming integration functions properly

Do NOT:

  • Try to verify actual cache persistence behavior
  • Create elaborate tests around Viceroy's stubbed functionality
  • Test cache hit/miss logic (this is host behavior, not SDK code)

The goal is to verify our Python wrapper code works, not to test Viceroy's cache implementation.

Reference

Activity

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      , 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
       blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

      Skip to content
      Add Core Cache API Support #53
      Open
      Task
      Open
      Add Core Cache API Support#53
      Task
      Milestone
      Alpha
      Description
      @posborne
      posborne
      opened on Feb 20, 2026
      Overview
      Add support for Fastly's Core Cache API, providing advanced caching capabilities with request collapsing, stale-while-revalidate, and streaming.
      WIT Interface
      interfacecache {
usetypes.{error};
usehttp-body.{body};
usehttp-req.{request};
useasync-io.{pollableaspending-entry};
resourceentry {
lookup:static func(key:list<u8>, options:lookup-options) ->result<entry, error>;
transaction-lookup:static func(key:list<u8>, options:lookup-options) ->result<entry, error>;
transaction-lookup-async:static func(key:list<u8>, options:lookup-options) ->result<pending-entry, error>;
transaction-insert:func(options:write-options) ->result<body, error>;
transaction-insert-and-stream-back:func(options:write-options) ->result<tuple<body, entry>, error>;
transaction-update:func(options:write-options) ->result<_, error>;
get-state:func() ->result<lookup-state, error>;
get-user-metadata:func(max-len:u64) ->result<option<list<u8>>, error>;
get-body:func(options:get-body-options) ->result<body, error>;
get-length:func() ->result<option<object-length>, error>;
get-max-age-ns:func() ->result<option<duration-ns>, error>;
get-stale-while-revalidate-ns:func() ->result<option<duration-ns>, error>;
get-age-ns:func() ->result<option<duration-ns>, error>;
get-hits:func() ->result<option<cache-hit-count>, error>;
transaction-cancel:func() ->result<_, error>;
}
resourcereplace-entry {
replace:static func(key:list<u8>, options:replace-options) ->result<replace-entry, error>;
get-age-ns:func() ->result<option<duration-ns>, error>;
get-body:func(options:get-body-options) ->result<option<body>, error>;
get-hits:func() ->result<option<cache-hit-count>, error>;
get-length:func() ->result<option<object-length>, error>;
get-max-age-ns:func() ->result<option<duration-ns>, error>;
get-stale-while-revalidate-ns:func() ->result<option<duration-ns>, error>;
get-state:func() ->result<option<lookup-state>, error>;
get-user-metadata:func(max-len:u64) ->result<option<list<u8>>, error>;
}
typeobject-length = u64;
typeduration-ns = u64;
typecache-hit-count = u64;
resourceextra-lookup-options {
constructor();
}
recordlookup-options {
request-headers:option<borrow<request>>,
always-use-requested-range:bool,
extra:option<borrow<extra-lookup-options>>,
}
resourceextra-write-options {
constructor();
}
recordwrite-options {
max-age-ns:duration-ns,
request-headers:option<borrow<request>>,
vary-rule:option<string>,
initial-age-ns:option<duration-ns>,
stale-while-revalidate-ns:option<duration-ns>,
surrogate-keys:option<string>,
length:option<object-length>,
user-metadata:option<list<u8>>,
edge-max-age-ns:option<duration-ns>,
sensitive-data:bool,
extra:option<borrow<extra-write-options>>,
}
resourceextra-get-body-options;
recordget-body-options {
%from:option<u64>,
to:option<u64>,
extra:option<borrow<extra-get-body-options>>,
}
flagslookup-state {
found,
usable,
stale,
must-insert-or-update,
usable-if-error,
}
resourceextra-replace-options {
constructor();
}
enumreplace-strategy {
immediate,
immediate-force-miss,
wait,
}
recordreplace-options {
request-headers:option<borrow<request>>,
replace-strategy:option<replace-strategy>,
always-use-requested-range:bool,
extra:option<borrow<extra-replace-options>>,
}
insert:func(key:list<u8>, options:write-options) ->result<body, error>;
await-entry:func(handle:pending-entry) ->result<entry, error>;
close-pending-entry:func(handle:pending-entry) ->result<_, error>;
close-entry:func(handle:entry) ->result<_, error>;
replace-insert:func(handle:replace-entry, options:write-options) ->result<body, error>;
close-replace-entry:func(handle:replace-entry) ->result<_, error>;
}
      WIT bindings: stubs/wit_world/imports/cache.py
      API Design
      • Implement CacheEntry resource wrapper for cache operations
      • Support lookup and transaction-based caching patterns
      • Implement LookupOptions and WriteOptions dataclasses
      • Provide access to cache metadata: age, TTL, hits, state flags
      • Transaction methods: transaction_lookup(), insert(), update(), cancel()
      • Entry body should implement io.IOBase for streaming (similar to KV Store)
      • get_body() returns file-like object that can be read in chunks or passed to stdlib functions
      Cross-SDK Comparison: All SDKs provide lookup(), insert(), transaction_lookup() with similar semantics. Rust uses strong typing for state/options enums, Go uses simple structs, JS uses async/Promise-based API. Python should support both blocking operations and context managers for transactions.
      Viceroy Testing
      Viceroy's cache implementation is limited/stubbed. Testing focus should be on:
      • Verifying hostcall invocations work correctly
      • Testing SDK wrapper logic (option parsing, state flag handling, error mapping)
      • Ensuring body streaming integration functions properly
      Do NOT:
      • Try to verify actual cache persistence behavior
      • Create elaborate tests around Viceroy's stubbed functionality
      • Test cache hit/miss logic (this is host behavior, not SDK code)
      The goal is to verify our Python wrapper code works, not to test Viceroy's cache implementation.
      Reference
      Activity
      Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
      Metadata
      Metadata
      Assignees
      No one assigned
        Labels
        No labels
        No labels
        Type
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        Projects
        No projects
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          Relationships
          None yet
          Development
          No branches or pull requests
          Issue actions
          
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

          Skip to content
          Add Core Cache API Support #53
          Open
          Task
          Open
          Add Core Cache API Support#53
          Task
          Milestone
          Alpha
          Description
          @posborne
          posborne
          opened on Feb 20, 2026
          Overview
          Add support for Fastly's Core Cache API, providing advanced caching capabilities with request collapsing, stale-while-revalidate, and streaming.
          WIT Interface
          interfacecache {
usetypes.{error};
usehttp-body.{body};
usehttp-req.{request};
useasync-io.{pollableaspending-entry};
resourceentry {
lookup:static func(key:list<u8>, options:lookup-options) ->result<entry, error>;
transaction-lookup:static func(key:list<u8>, options:lookup-options) ->result<entry, error>;
transaction-lookup-async:static func(key:list<u8>, options:lookup-options) ->result<pending-entry, error>;
transaction-insert:func(options:write-options) ->result<body, error>;
transaction-insert-and-stream-back:func(options:write-options) ->result<tuple<body, entry>, error>;
transaction-update:func(options:write-options) ->result<_, error>;
get-state:func() ->result<lookup-state, error>;
get-user-metadata:func(max-len:u64) ->result<option<list<u8>>, error>;
get-body:func(options:get-body-options) ->result<body, error>;
get-length:func() ->result<option<object-length>, error>;
get-max-age-ns:func() ->result<option<duration-ns>, error>;
get-stale-while-revalidate-ns:func() ->result<option<duration-ns>, error>;
get-age-ns:func() ->result<option<duration-ns>, error>;
get-hits:func() ->result<option<cache-hit-count>, error>;
transaction-cancel:func() ->result<_, error>;
}
resourcereplace-entry {
replace:static func(key:list<u8>, options:replace-options) ->result<replace-entry, error>;
get-age-ns:func() ->result<option<duration-ns>, error>;
get-body:func(options:get-body-options) ->result<option<body>, error>;
get-hits:func() ->result<option<cache-hit-count>, error>;
get-length:func() ->result<option<object-length>, error>;
get-max-age-ns:func() ->result<option<duration-ns>, error>;
get-stale-while-revalidate-ns:func() ->result<option<duration-ns>, error>;
get-state:func() ->result<option<lookup-state>, error>;
get-user-metadata:func(max-len:u64) ->result<option<list<u8>>, error>;
}
typeobject-length = u64;
typeduration-ns = u64;
typecache-hit-count = u64;
resourceextra-lookup-options {
constructor();
}
recordlookup-options {
request-headers:option<borrow<request>>,
always-use-requested-range:bool,
extra:option<borrow<extra-lookup-options>>,
}
resourceextra-write-options {
constructor();
}
recordwrite-options {
max-age-ns:duration-ns,
request-headers:option<borrow<request>>,
vary-rule:option<string>,
initial-age-ns:option<duration-ns>,
stale-while-revalidate-ns:option<duration-ns>,
surrogate-keys:option<string>,
length:option<object-length>,
user-metadata:option<list<u8>>,
edge-max-age-ns:option<duration-ns>,
sensitive-data:bool,
extra:option<borrow<extra-write-options>>,
}
resourceextra-get-body-options;
recordget-body-options {
%from:option<u64>,
to:option<u64>,
extra:option<borrow<extra-get-body-options>>,
}
flagslookup-state {
found,
usable,
stale,
must-insert-or-update,
usable-if-error,
}
resourceextra-replace-options {
constructor();
}
enumreplace-strategy {
immediate,
immediate-force-miss,
wait,
}
recordreplace-options {
request-headers:option<borrow<request>>,
replace-strategy:option<replace-strategy>,
always-use-requested-range:bool,
extra:option<borrow<extra-replace-options>>,
}
insert:func(key:list<u8>, options:write-options) ->result<body, error>;
await-entry:func(handle:pending-entry) ->result<entry, error>;
close-pending-entry:func(handle:pending-entry) ->result<_, error>;
close-entry:func(handle:entry) ->result<_, error>;
replace-insert:func(handle:replace-entry, options:write-options) ->result<body, error>;
close-replace-entry:func(handle:replace-entry) ->result<_, error>;
}
          WIT bindings: stubs/wit_world/imports/cache.py
          API Design
          • Implement CacheEntry resource wrapper for cache operations
          • Support lookup and transaction-based caching patterns
          • Implement LookupOptions and WriteOptions dataclasses
          • Provide access to cache metadata: age, TTL, hits, state flags
          • Transaction methods: transaction_lookup(), insert(), update(), cancel()
          • Entry body should implement io.IOBase for streaming (similar to KV Store)
          • get_body() returns file-like object that can be read in chunks or passed to stdlib functions
          Cross-SDK Comparison: All SDKs provide lookup(), insert(), transaction_lookup() with similar semantics. Rust uses strong typing for state/options enums, Go uses simple structs, JS uses async/Promise-based API. Python should support both blocking operations and context managers for transactions.
          Viceroy Testing
          Viceroy's cache implementation is limited/stubbed. Testing focus should be on:
          • Verifying hostcall invocations work correctly
          • Testing SDK wrapper logic (option parsing, state flag handling, error mapping)
          • Ensuring body streaming integration functions properly
          Do NOT:
          • Try to verify actual cache persistence behavior
          • Create elaborate tests around Viceroy's stubbed functionality
          • Test cache hit/miss logic (this is host behavior, not SDK code)
          The goal is to verify our Python wrapper code works, not to test Viceroy's cache implementation.
          Reference
          Activity
          Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
          Metadata
          Metadata
          Assignees
          No one assigned
            Labels
            No labels
            No labels
            Type
            Task
            Projects
            No projects
              Milestone
              Relationships
              None yet
              Development
              No branches or pull requests
              Issue actions
              
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

              Skip to content
              Add Core Cache API Support #53
              Open
              Task
              Open
              Add Core Cache API Support#53
              Task
              Milestone
              Alpha
              Description
              @posborne
              posborne
              opened on Feb 20, 2026
              Overview
              Add support for Fastly's Core Cache API, providing advanced caching capabilities with request collapsing, stale-while-revalidate, and streaming.
              WIT Interface
              interfacecache {
usetypes.{error};
usehttp-body.{body};
usehttp-req.{request};
useasync-io.{pollableaspending-entry};
resourceentry {
lookup:static func(key:list<u8>, options:lookup-options) ->result<entry, error>;
transaction-lookup:static func(key:list<u8>, options:lookup-options) ->result<entry, error>;
transaction-lookup-async:static func(key:list<u8>, options:lookup-options) ->result<pending-entry, error>;
transaction-insert:func(options:write-options) ->result<body, error>;
transaction-insert-and-stream-back:func(options:write-options) ->result<tuple<body, entry>, error>;
transaction-update:func(options:write-options) ->result<_, error>;
get-state:func() ->result<lookup-state, error>;
get-user-metadata:func(max-len:u64) ->result<option<list<u8>>, error>;
get-body:func(options:get-body-options) ->result<body, error>;
get-length:func() ->result<option<object-length>, error>;
get-max-age-ns:func() ->result<option<duration-ns>, error>;
get-stale-while-revalidate-ns:func() ->result<option<duration-ns>, error>;
get-age-ns:func() ->result<option<duration-ns>, error>;
get-hits:func() ->result<option<cache-hit-count>, error>;
transaction-cancel:func() ->result<_, error>;
}
resourcereplace-entry {
replace:static func(key:list<u8>, options:replace-options) ->result<replace-entry, error>;
get-age-ns:func() ->result<option<duration-ns>, error>;
get-body:func(options:get-body-options) ->result<option<body>, error>;
get-hits:func() ->result<option<cache-hit-count>, error>;
get-length:func() ->result<option<object-length>, error>;
get-max-age-ns:func() ->result<option<duration-ns>, error>;
get-stale-while-revalidate-ns:func() ->result<option<duration-ns>, error>;
get-state:func() ->result<option<lookup-state>, error>;
get-user-metadata:func(max-len:u64) ->result<option<list<u8>>, error>;
}
typeobject-length = u64;
typeduration-ns = u64;
typecache-hit-count = u64;
resourceextra-lookup-options {
constructor();
}
recordlookup-options {
request-headers:option<borrow<request>>,
always-use-requested-range:bool,
extra:option<borrow<extra-lookup-options>>,
}
resourceextra-write-options {
constructor();
}
recordwrite-options {
max-age-ns:duration-ns,
request-headers:option<borrow<request>>,
vary-rule:option<string>,
initial-age-ns:option<duration-ns>,
stale-while-revalidate-ns:option<duration-ns>,
surrogate-keys:option<string>,
length:option<object-length>,
user-metadata:option<list<u8>>,
edge-max-age-ns:option<duration-ns>,
sensitive-data:bool,
extra:option<borrow<extra-write-options>>,
}
resourceextra-get-body-options;
recordget-body-options {
%from:option<u64>,
to:option<u64>,
extra:option<borrow<extra-get-body-options>>,
}
flagslookup-state {
found,
usable,
stale,
must-insert-or-update,
usable-if-error,
}
resourceextra-replace-options {
constructor();
}
enumreplace-strategy {
immediate,
immediate-force-miss,
wait,
}
recordreplace-options {
request-headers:option<borrow<request>>,
replace-strategy:option<replace-strategy>,
always-use-requested-range:bool,
extra:option<borrow<extra-replace-options>>,
}
insert:func(key:list<u8>, options:write-options) ->result<body, error>;
await-entry:func(handle:pending-entry) ->result<entry, error>;
close-pending-entry:func(handle:pending-entry) ->result<_, error>;
close-entry:func(handle:entry) ->result<_, error>;
replace-insert:func(handle:replace-entry, options:write-options) ->result<body, error>;
close-replace-entry:func(handle:replace-entry) ->result<_, error>;
}
              WIT bindings: stubs/wit_world/imports/cache.py
              API Design
              • Implement CacheEntry resource wrapper for cache operations
              • Support lookup and transaction-based caching patterns
              • Implement LookupOptions and WriteOptions dataclasses
              • Provide access to cache metadata: age, TTL, hits, state flags
              • Transaction methods: transaction_lookup(), insert(), update(), cancel()
              • Entry body should implement io.IOBase for streaming (similar to KV Store)
              • get_body() returns file-like object that can be read in chunks or passed to stdlib functions
              Cross-SDK Comparison: All SDKs provide lookup(), insert(), transaction_lookup() with similar semantics. Rust uses strong typing for state/options enums, Go uses simple structs, JS uses async/Promise-based API. Python should support both blocking operations and context managers for transactions.
              Viceroy Testing
              Viceroy's cache implementation is limited/stubbed. Testing focus should be on:
              • Verifying hostcall invocations work correctly
              • Testing SDK wrapper logic (option parsing, state flag handling, error mapping)
              • Ensuring body streaming integration functions properly
              Do NOT:
              • Try to verify actual cache persistence behavior
              • Create elaborate tests around Viceroy's stubbed functionality
              • Test cache hit/miss logic (this is host behavior, not SDK code)
              The goal is to verify our Python wrapper code works, not to test Viceroy's cache implementation.
              Reference
              Activity
              Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
              Metadata
              Metadata
              Assignees
              No one assigned
                Labels
                No labels
                No labels
                Type
                Task
                Projects
                No projects
                  Milestone
                  Relationships
                  None yet
                  Development
                  No branches or pull requests
                  Issue actions
                  
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

                  Skip to content
                  Add Core Cache API Support #53
                  Open
                  Task
                  Open
                  Add Core Cache API Support#53
                  Task
                  Milestone
                  Alpha
                  Description
                  @posborne
                  posborne
                  opened on Feb 20, 2026
                  Overview
                  Add support for Fastly's Core Cache API, providing advanced caching capabilities with request collapsing, stale-while-revalidate, and streaming.
                  WIT Interface
                  interfacecache {
usetypes.{error};
usehttp-body.{body};
usehttp-req.{request};
useasync-io.{pollableaspending-entry};
resourceentry {
lookup:static func(key:list<u8>, options:lookup-options) ->result<entry, error>;
transaction-lookup:static func(key:list<u8>, options:lookup-options) ->result<entry, error>;
transaction-lookup-async:static func(key:list<u8>, options:lookup-options) ->result<pending-entry, error>;
transaction-insert:func(options:write-options) ->result<body, error>;
transaction-insert-and-stream-back:func(options:write-options) ->result<tuple<body, entry>, error>;
transaction-update:func(options:write-options) ->result<_, error>;
get-state:func() ->result<lookup-state, error>;
get-user-metadata:func(max-len:u64) ->result<option<list<u8>>, error>;
get-body:func(options:get-body-options) ->result<body, error>;
get-length:func() ->result<option<object-length>, error>;
get-max-age-ns:func() ->result<option<duration-ns>, error>;
get-stale-while-revalidate-ns:func() ->result<option<duration-ns>, error>;
get-age-ns:func() ->result<option<duration-ns>, error>;
get-hits:func() ->result<option<cache-hit-count>, error>;
transaction-cancel:func() ->result<_, error>;
}
resourcereplace-entry {
replace:static func(key:list<u8>, options:replace-options) ->result<replace-entry, error>;
get-age-ns:func() ->result<option<duration-ns>, error>;
get-body:func(options:get-body-options) ->result<option<body>, error>;
get-hits:func() ->result<option<cache-hit-count>, error>;
get-length:func() ->result<option<object-length>, error>;
get-max-age-ns:func() ->result<option<duration-ns>, error>;
get-stale-while-revalidate-ns:func() ->result<option<duration-ns>, error>;
get-state:func() ->result<option<lookup-state>, error>;
get-user-metadata:func(max-len:u64) ->result<option<list<u8>>, error>;
}
typeobject-length = u64;
typeduration-ns = u64;
typecache-hit-count = u64;
resourceextra-lookup-options {
constructor();
}
recordlookup-options {
request-headers:option<borrow<request>>,
always-use-requested-range:bool,
extra:option<borrow<extra-lookup-options>>,
}
resourceextra-write-options {
constructor();
}
recordwrite-options {
max-age-ns:duration-ns,
request-headers:option<borrow<request>>,
vary-rule:option<string>,
initial-age-ns:option<duration-ns>,
stale-while-revalidate-ns:option<duration-ns>,
surrogate-keys:option<string>,
length:option<object-length>,
user-metadata:option<list<u8>>,
edge-max-age-ns:option<duration-ns>,
sensitive-data:bool,
extra:option<borrow<extra-write-options>>,
}
resourceextra-get-body-options;
recordget-body-options {
%from:option<u64>,
to:option<u64>,
extra:option<borrow<extra-get-body-options>>,
}
flagslookup-state {
found,
usable,
stale,
must-insert-or-update,
usable-if-error,
}
resourceextra-replace-options {
constructor();
}
enumreplace-strategy {
immediate,
immediate-force-miss,
wait,
}
recordreplace-options {
request-headers:option<borrow<request>>,
replace-strategy:option<replace-strategy>,
always-use-requested-range:bool,
extra:option<borrow<extra-replace-options>>,
}
insert:func(key:list<u8>, options:write-options) ->result<body, error>;
await-entry:func(handle:pending-entry) ->result<entry, error>;
close-pending-entry:func(handle:pending-entry) ->result<_, error>;
close-entry:func(handle:entry) ->result<_, error>;
replace-insert:func(handle:replace-entry, options:write-options) ->result<body, error>;
close-replace-entry:func(handle:replace-entry) ->result<_, error>;
}
                  WIT bindings: stubs/wit_world/imports/cache.py
                  API Design
                  • Implement CacheEntry resource wrapper for cache operations
                  • Support lookup and transaction-based caching patterns
                  • Implement LookupOptions and WriteOptions dataclasses
                  • Provide access to cache metadata: age, TTL, hits, state flags
                  • Transaction methods: transaction_lookup(), insert(), update(), cancel()
                  • Entry body should implement io.IOBase for streaming (similar to KV Store)
                  • get_body() returns file-like object that can be read in chunks or passed to stdlib functions
                  Cross-SDK Comparison: All SDKs provide lookup(), insert(), transaction_lookup() with similar semantics. Rust uses strong typing for state/options enums, Go uses simple structs, JS uses async/Promise-based API. Python should support both blocking operations and context managers for transactions.
                  Viceroy Testing
                  Viceroy's cache implementation is limited/stubbed. Testing focus should be on:
                  • Verifying hostcall invocations work correctly
                  • Testing SDK wrapper logic (option parsing, state flag handling, error mapping)
                  • Ensuring body streaming integration functions properly
                  Do NOT:
                  • Try to verify actual cache persistence behavior
                  • Create elaborate tests around Viceroy's stubbed functionality
                  • Test cache hit/miss logic (this is host behavior, not SDK code)
                  The goal is to verify our Python wrapper code works, not to test Viceroy's cache implementation.
                  Reference
                  Activity
                  Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
                  Metadata
                  Metadata
                  Assignees
                  No one assigned
                    Labels
                    No labels
                    No labels
                    Type
                    Task
                    Projects
                    No projects
                      Milestone
                      Relationships
                      None yet
                      Development
                      No branches or pull requests
                      Issue actions
                      
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

                      Skip to content
                      Add Core Cache API Support #53
                      Open
                      Task
                      Open
                      Add Core Cache API Support#53
                      Task
                      Milestone
                      Alpha
                      Description
                      @posborne
                      posborne
                      opened on Feb 20, 2026
                      Overview
                      Add support for Fastly's Core Cache API, providing advanced caching capabilities with request collapsing, stale-while-revalidate, and streaming.
                      WIT Interface
                      interfacecache {
usetypes.{error};
usehttp-body.{body};
usehttp-req.{request};
useasync-io.{pollableaspending-entry};
resourceentry {
lookup:static func(key:list<u8>, options:lookup-options) ->result<entry, error>;
transaction-lookup:static func(key:list<u8>, options:lookup-options) ->result<entry, error>;
transaction-lookup-async:static func(key:list<u8>, options:lookup-options) ->result<pending-entry, error>;
transaction-insert:func(options:write-options) ->result<body, error>;
transaction-insert-and-stream-back:func(options:write-options) ->result<tuple<body, entry>, error>;
transaction-update:func(options:write-options) ->result<_, error>;
get-state:func() ->result<lookup-state, error>;
get-user-metadata:func(max-len:u64) ->result<option<list<u8>>, error>;
get-body:func(options:get-body-options) ->result<body, error>;
get-length:func() ->result<option<object-length>, error>;
get-max-age-ns:func() ->result<option<duration-ns>, error>;
get-stale-while-revalidate-ns:func() ->result<option<duration-ns>, error>;
get-age-ns:func() ->result<option<duration-ns>, error>;
get-hits:func() ->result<option<cache-hit-count>, error>;
transaction-cancel:func() ->result<_, error>;
}
resourcereplace-entry {
replace:static func(key:list<u8>, options:replace-options) ->result<replace-entry, error>;
get-age-ns:func() ->result<option<duration-ns>, error>;
get-body:func(options:get-body-options) ->result<option<body>, error>;
get-hits:func() ->result<option<cache-hit-count>, error>;
get-length:func() ->result<option<object-length>, error>;
get-max-age-ns:func() ->result<option<duration-ns>, error>;
get-stale-while-revalidate-ns:func() ->result<option<duration-ns>, error>;
get-state:func() ->result<option<lookup-state>, error>;
get-user-metadata:func(max-len:u64) ->result<option<list<u8>>, error>;
}
typeobject-length = u64;
typeduration-ns = u64;
typecache-hit-count = u64;
resourceextra-lookup-options {
constructor();
}
recordlookup-options {
request-headers:option<borrow<request>>,
always-use-requested-range:bool,
extra:option<borrow<extra-lookup-options>>,
}
resourceextra-write-options {
constructor();
}
recordwrite-options {
max-age-ns:duration-ns,
request-headers:option<borrow<request>>,
vary-rule:option<string>,
initial-age-ns:option<duration-ns>,
stale-while-revalidate-ns:option<duration-ns>,
surrogate-keys:option<string>,
length:option<object-length>,
user-metadata:option<list<u8>>,
edge-max-age-ns:option<duration-ns>,
sensitive-data:bool,
extra:option<borrow<extra-write-options>>,
}
resourceextra-get-body-options;
recordget-body-options {
%from:option<u64>,
to:option<u64>,
extra:option<borrow<extra-get-body-options>>,
}
flagslookup-state {
found,
usable,
stale,
must-insert-or-update,
usable-if-error,
}
resourceextra-replace-options {
constructor();
}
enumreplace-strategy {
immediate,
immediate-force-miss,
wait,
}
recordreplace-options {
request-headers:option<borrow<request>>,
replace-strategy:option<replace-strategy>,
always-use-requested-range:bool,
extra:option<borrow<extra-replace-options>>,
}
insert:func(key:list<u8>, options:write-options) ->result<body, error>;
await-entry:func(handle:pending-entry) ->result<entry, error>;
close-pending-entry:func(handle:pending-entry) ->result<_, error>;
close-entry:func(handle:entry) ->result<_, error>;
replace-insert:func(handle:replace-entry, options:write-options) ->result<body, error>;
close-replace-entry:func(handle:replace-entry) ->result<_, error>;
}
                      WIT bindings: stubs/wit_world/imports/cache.py
                      API Design
                      • Implement CacheEntry resource wrapper for cache operations
                      • Support lookup and transaction-based caching patterns
                      • Implement LookupOptions and WriteOptions dataclasses
                      • Provide access to cache metadata: age, TTL, hits, state flags
                      • Transaction methods: transaction_lookup(), insert(), update(), cancel()
                      • Entry body should implement io.IOBase for streaming (similar to KV Store)
                      • get_body() returns file-like object that can be read in chunks or passed to stdlib functions
                      Cross-SDK Comparison: All SDKs provide lookup(), insert(), transaction_lookup() with similar semantics. Rust uses strong typing for state/options enums, Go uses simple structs, JS uses async/Promise-based API. Python should support both blocking operations and context managers for transactions.
                      Viceroy Testing
                      Viceroy's cache implementation is limited/stubbed. Testing focus should be on:
                      • Verifying hostcall invocations work correctly
                      • Testing SDK wrapper logic (option parsing, state flag handling, error mapping)
                      • Ensuring body streaming integration functions properly
                      Do NOT:
                      • Try to verify actual cache persistence behavior
                      • Create elaborate tests around Viceroy's stubbed functionality
                      • Test cache hit/miss logic (this is host behavior, not SDK code)
                      The goal is to verify our Python wrapper code works, not to test Viceroy's cache implementation.
                      Reference
                      Activity
                      Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
                      Metadata
                      Metadata
                      Assignees
                      No one assigned
                        Labels
                        No labels
                        No labels
                        Type
                        Task
                        Projects
                        No projects
                          Milestone
                          Relationships
                          None yet
                          Development
                          No branches or pull requests
                          Issue actions
                          
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

                          Skip to content
                          Add Core Cache API Support #53
                          Open
                          Task
                          Open
                          Add Core Cache API Support#53
                          Task
                          Milestone
                          Alpha
                          Description
                          @posborne
                          posborne
                          opened on Feb 20, 2026
                          Overview
                          Add support for Fastly's Core Cache API, providing advanced caching capabilities with request collapsing, stale-while-revalidate, and streaming.
                          WIT Interface
                          interfacecache {
usetypes.{error};
usehttp-body.{body};
usehttp-req.{request};
useasync-io.{pollableaspending-entry};
resourceentry {
lookup:static func(key:list<u8>, options:lookup-options) ->result<entry, error>;
transaction-lookup:static func(key:list<u8>, options:lookup-options) ->result<entry, error>;
transaction-lookup-async:static func(key:list<u8>, options:lookup-options) ->result<pending-entry, error>;
transaction-insert:func(options:write-options) ->result<body, error>;
transaction-insert-and-stream-back:func(options:write-options) ->result<tuple<body, entry>, error>;
transaction-update:func(options:write-options) ->result<_, error>;
get-state:func() ->result<lookup-state, error>;
get-user-metadata:func(max-len:u64) ->result<option<list<u8>>, error>;
get-body:func(options:get-body-options) ->result<body, error>;
get-length:func() ->result<option<object-length>, error>;
get-max-age-ns:func() ->result<option<duration-ns>, error>;
get-stale-while-revalidate-ns:func() ->result<option<duration-ns>, error>;
get-age-ns:func() ->result<option<duration-ns>, error>;
get-hits:func() ->result<option<cache-hit-count>, error>;
transaction-cancel:func() ->result<_, error>;
}
resourcereplace-entry {
replace:static func(key:list<u8>, options:replace-options) ->result<replace-entry, error>;
get-age-ns:func() ->result<option<duration-ns>, error>;
get-body:func(options:get-body-options) ->result<option<body>, error>;
get-hits:func() ->result<option<cache-hit-count>, error>;
get-length:func() ->result<option<object-length>, error>;
get-max-age-ns:func() ->result<option<duration-ns>, error>;
get-stale-while-revalidate-ns:func() ->result<option<duration-ns>, error>;
get-state:func() ->result<option<lookup-state>, error>;
get-user-metadata:func(max-len:u64) ->result<option<list<u8>>, error>;
}
typeobject-length = u64;
typeduration-ns = u64;
typecache-hit-count = u64;
resourceextra-lookup-options {
constructor();
}
recordlookup-options {
request-headers:option<borrow<request>>,
always-use-requested-range:bool,
extra:option<borrow<extra-lookup-options>>,
}
resourceextra-write-options {
constructor();
}
recordwrite-options {
max-age-ns:duration-ns,
request-headers:option<borrow<request>>,
vary-rule:option<string>,
initial-age-ns:option<duration-ns>,
stale-while-revalidate-ns:option<duration-ns>,
surrogate-keys:option<string>,
length:option<object-length>,
user-metadata:option<list<u8>>,
edge-max-age-ns:option<duration-ns>,
sensitive-data:bool,
extra:option<borrow<extra-write-options>>,
}
resourceextra-get-body-options;
recordget-body-options {
%from:option<u64>,
to:option<u64>,
extra:option<borrow<extra-get-body-options>>,
}
flagslookup-state {
found,
usable,
stale,
must-insert-or-update,
usable-if-error,
}
resourceextra-replace-options {
constructor();
}
enumreplace-strategy {
immediate,
immediate-force-miss,
wait,
}
recordreplace-options {
request-headers:option<borrow<request>>,
replace-strategy:option<replace-strategy>,
always-use-requested-range:bool,
extra:option<borrow<extra-replace-options>>,
}
insert:func(key:list<u8>, options:write-options) ->result<body, error>;
await-entry:func(handle:pending-entry) ->result<entry, error>;
close-pending-entry:func(handle:pending-entry) ->result<_, error>;
close-entry:func(handle:entry) ->result<_, error>;
replace-insert:func(handle:replace-entry, options:write-options) ->result<body, error>;
close-replace-entry:func(handle:replace-entry) ->result<_, error>;
}
                          WIT bindings: stubs/wit_world/imports/cache.py
                          API Design
                          • Implement CacheEntry resource wrapper for cache operations
                          • Support lookup and transaction-based caching patterns
                          • Implement LookupOptions and WriteOptions dataclasses
                          • Provide access to cache metadata: age, TTL, hits, state flags
                          • Transaction methods: transaction_lookup(), insert(), update(), cancel()
                          • Entry body should implement io.IOBase for streaming (similar to KV Store)
                          • get_body() returns file-like object that can be read in chunks or passed to stdlib functions
                          Cross-SDK Comparison: All SDKs provide lookup(), insert(), transaction_lookup() with similar semantics. Rust uses strong typing for state/options enums, Go uses simple structs, JS uses async/Promise-based API. Python should support both blocking operations and context managers for transactions.
                          Viceroy Testing
                          Viceroy's cache implementation is limited/stubbed. Testing focus should be on:
                          • Verifying hostcall invocations work correctly
                          • Testing SDK wrapper logic (option parsing, state flag handling, error mapping)
                          • Ensuring body streaming integration functions properly
                          Do NOT:
                          • Try to verify actual cache persistence behavior
                          • Create elaborate tests around Viceroy's stubbed functionality
                          • Test cache hit/miss logic (this is host behavior, not SDK code)
                          The goal is to verify our Python wrapper code works, not to test Viceroy's cache implementation.
                          Reference
                          Activity
                          Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
                          Metadata
                          Metadata
                          Assignees
                          No one assigned
                            Labels
                            No labels
                            No labels
                            Type
                            Task
                            Projects
                            No projects
                              Milestone
                              Relationships
                              None yet
                              Development
                              No branches or pull requests
                              Issue actions
                              
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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                              Add Core Cache API Support #53
                              Open
                              Task
                              Open
                              Add Core Cache API Support#53
                              Task
                              Milestone
                              Alpha
                              Description
                              @posborne
                              posborne
                              opened on Feb 20, 2026
                              Overview
                              Add support for Fastly's Core Cache API, providing advanced caching capabilities with request collapsing, stale-while-revalidate, and streaming.
                              WIT Interface
                              interfacecache {
usetypes.{error};
usehttp-body.{body};
usehttp-req.{request};
useasync-io.{pollableaspending-entry};
resourceentry {
lookup:static func(key:list<u8>, options:lookup-options) ->result<entry, error>;
transaction-lookup:static func(key:list<u8>, options:lookup-options) ->result<entry, error>;
transaction-lookup-async:static func(key:list<u8>, options:lookup-options) ->result<pending-entry, error>;
transaction-insert:func(options:write-options) ->result<body, error>;
transaction-insert-and-stream-back:func(options:write-options) ->result<tuple<body, entry>, error>;
transaction-update:func(options:write-options) ->result<_, error>;
get-state:func() ->result<lookup-state, error>;
get-user-metadata:func(max-len:u64) ->result<option<list<u8>>, error>;
get-body:func(options:get-body-options) ->result<body, error>;
get-length:func() ->result<option<object-length>, error>;
get-max-age-ns:func() ->result<option<duration-ns>, error>;
get-stale-while-revalidate-ns:func() ->result<option<duration-ns>, error>;
get-age-ns:func() ->result<option<duration-ns>, error>;
get-hits:func() ->result<option<cache-hit-count>, error>;
transaction-cancel:func() ->result<_, error>;
}
resourcereplace-entry {
replace:static func(key:list<u8>, options:replace-options) ->result<replace-entry, error>;
get-age-ns:func() ->result<option<duration-ns>, error>;
get-body:func(options:get-body-options) ->result<option<body>, error>;
get-hits:func() ->result<option<cache-hit-count>, error>;
get-length:func() ->result<option<object-length>, error>;
get-max-age-ns:func() ->result<option<duration-ns>, error>;
get-stale-while-revalidate-ns:func() ->result<option<duration-ns>, error>;
get-state:func() ->result<option<lookup-state>, error>;
get-user-metadata:func(max-len:u64) ->result<option<list<u8>>, error>;
}
typeobject-length = u64;
typeduration-ns = u64;
typecache-hit-count = u64;
resourceextra-lookup-options {
constructor();
}
recordlookup-options {
request-headers:option<borrow<request>>,
always-use-requested-range:bool,
extra:option<borrow<extra-lookup-options>>,
}
resourceextra-write-options {
constructor();
}
recordwrite-options {
max-age-ns:duration-ns,
request-headers:option<borrow<request>>,
vary-rule:option<string>,
initial-age-ns:option<duration-ns>,
stale-while-revalidate-ns:option<duration-ns>,
surrogate-keys:option<string>,
length:option<object-length>,
user-metadata:option<list<u8>>,
edge-max-age-ns:option<duration-ns>,
sensitive-data:bool,
extra:option<borrow<extra-write-options>>,
}
resourceextra-get-body-options;
recordget-body-options {
%from:option<u64>,
to:option<u64>,
extra:option<borrow<extra-get-body-options>>,
}
flagslookup-state {
found,
usable,
stale,
must-insert-or-update,
usable-if-error,
}
resourceextra-replace-options {
constructor();
}
enumreplace-strategy {
immediate,
immediate-force-miss,
wait,
}
recordreplace-options {
request-headers:option<borrow<request>>,
replace-strategy:option<replace-strategy>,
always-use-requested-range:bool,
extra:option<borrow<extra-replace-options>>,
}
insert:func(key:list<u8>, options:write-options) ->result<body, error>;
await-entry:func(handle:pending-entry) ->result<entry, error>;
close-pending-entry:func(handle:pending-entry) ->result<_, error>;
close-entry:func(handle:entry) ->result<_, error>;
replace-insert:func(handle:replace-entry, options:write-options) ->result<body, error>;
close-replace-entry:func(handle:replace-entry) ->result<_, error>;
}
                              WIT bindings: stubs/wit_world/imports/cache.py
                              API Design
                              • Implement CacheEntry resource wrapper for cache operations
                              • Support lookup and transaction-based caching patterns
                              • Implement LookupOptions and WriteOptions dataclasses
                              • Provide access to cache metadata: age, TTL, hits, state flags
                              • Transaction methods: transaction_lookup(), insert(), update(), cancel()
                              • Entry body should implement io.IOBase for streaming (similar to KV Store)
                              • get_body() returns file-like object that can be read in chunks or passed to stdlib functions
                              Cross-SDK Comparison: All SDKs provide lookup(), insert(), transaction_lookup() with similar semantics. Rust uses strong typing for state/options enums, Go uses simple structs, JS uses async/Promise-based API. Python should support both blocking operations and context managers for transactions.
                              Viceroy Testing
                              Viceroy's cache implementation is limited/stubbed. Testing focus should be on:
                              • Verifying hostcall invocations work correctly
                              • Testing SDK wrapper logic (option parsing, state flag handling, error mapping)
                              • Ensuring body streaming integration functions properly
                              Do NOT:
                              • Try to verify actual cache persistence behavior
                              • Create elaborate tests around Viceroy's stubbed functionality
                              • Test cache hit/miss logic (this is host behavior, not SDK code)
                              The goal is to verify our Python wrapper code works, not to test Viceroy's cache implementation.
                              Reference
                              Activity
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