[bitreq] Check utf-8 while deserializing JSON body - #486

Merged
tnull merged 2 commits into
rust-bitcoin:masterfrom
tankyleo:26-01-check-utf8-while-flying
Jan 30, 2026
Merged

[bitreq] Check utf-8 while deserializing JSON body#486
tnull merged 2 commits into
rust-bitcoin:masterfrom
tankyleo:26-01-check-utf8-while-flying

Conversation

@tankyleo

Copy link
Copy Markdown
Contributor
 [bitreq] Check utf-8 while deserializing JSON body
While deserializing, `serde_json::from_slice` validates utf-8 as
needed. So instead of making two passes on the response body, one
to validate utf-8, and another to deserialize the object, we can
let `serde_json::from_slice` check utf-8 as needed during
deserialization.
`Response::json` now returns `Error::SerdeJsonError` instead of
`Error::InvalidUtf8InBody` if invalid utf-8 bytes are found during
deserialization.

and

 [bitreq] Serialize `Request` body into `Vec<u8>`
We avoid creating a `String` only to immediately convert it back to its
inner `Vec<u8>`.
This also mirrors the `serde_json::from_slice` call made when parsing a
`Response` body as JSON.

@tankyleo

Copy link
Copy Markdown
ContributorAuthor

This came up while me and @tnull were working on migrating to bitreq in lightningdevkit/vss-client#56

@tnulltnull left a comment

Copy link
Copy Markdown
Collaborator

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

T: serde::de::Deserialize<'a>,
{
match serde_json::from_str(self.as_str()?) {
match serde_json::from_slice(self.as_bytes()) {

Copy link
Copy Markdown
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Do we really prefer the serde error over the utf8 error? I'm skeptical the claimed perf difference matters (notably when deserializing a string in the json serde skips utf8 validation if you call from_str whereas has to do it if you call from_slice). I don't have a strong feeling on the error but the commit should explain why we prefer the swap.

Copy link
Copy Markdown
ContributorAuthor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Thanks Matt see below, I have expanded the commit message.

I'm skeptical the claimed perf difference matters

The claim is that a reduction in cache misses leads to non-trivial performance gains.

We still do the same amount of work on the data.

While deserializing, `serde_json::from_slice` validates utf-8 as
needed. So instead of making two passes on the response body, one
to validate utf-8, and another to deserialize the object, we let
`serde_json::from_slice` check utf-8 as needed during deserialization.
Making a single pass over large response bodies reduces the number of
cache misses, and hence decreases the cycles taken to fully deserialize
such responses.
`Response::json` now returns `Error::SerdeJsonError` instead of
`Error::InvalidUtf8InBody` if invalid utf-8 is found during
deserialization.
For this error case, the `Error::SerdeJsonError` inner type
`serde_json::error::Error` is of category
`serde_json::error::Category::Syntax`. Other JSON syntax errors are
also assigned to this category.
We accept this loss of information given the performance gain described
above.
We avoid creating a `String` only to immediately convert it back to its
inner `Vec<u8>`.
This also mirrors the `serde_json::from_slice` call made when parsing a
`Response` body as JSON.
@tankyleo
tankyleoforce-pushed the 26-01-check-utf8-while-flying branch from a3ae780 to 2c3bbf2CompareJanuary 30, 2026 19:08

@TheBlueMattTheBlueMatt left a comment

Copy link
Copy Markdown
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Mmm, fair enough.

ACK 2c3bbf2

@tnull
tnull merged commit cfba70d into rust-bitcoin:masterJan 30, 2026
31 checks passed
Sign up for freeto join this conversation on GitHub. Already have an account? Sign in to comment

Labels

None yet

Projects

None yet

Development

Successfully merging this pull request may close these issues.

3 participants

@tankyleo@tnull@TheBlueMatt
, '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

[bitreq] Check utf-8 while deserializing JSON body - #486

Merged
tnull merged 2 commits into
rust-bitcoin:masterfrom
tankyleo:26-01-check-utf8-while-flying
Jan 30, 2026
Merged

[bitreq] Check utf-8 while deserializing JSON body#486
tnull merged 2 commits into
rust-bitcoin:masterfrom
tankyleo:26-01-check-utf8-while-flying

Conversation

@tankyleo

Copy link
Copy Markdown
Contributor
 [bitreq] Check utf-8 while deserializing JSON body
While deserializing, `serde_json::from_slice` validates utf-8 as
needed. So instead of making two passes on the response body, one
to validate utf-8, and another to deserialize the object, we can
let `serde_json::from_slice` check utf-8 as needed during
deserialization.
`Response::json` now returns `Error::SerdeJsonError` instead of
`Error::InvalidUtf8InBody` if invalid utf-8 bytes are found during
deserialization.

and

 [bitreq] Serialize `Request` body into `Vec<u8>`
We avoid creating a `String` only to immediately convert it back to its
inner `Vec<u8>`.
This also mirrors the `serde_json::from_slice` call made when parsing a
`Response` body as JSON.

@tankyleo

Copy link
Copy Markdown
ContributorAuthor

This came up while me and @tnull were working on migrating to bitreq in lightningdevkit/vss-client#56

@tnulltnull left a comment

Copy link
Copy Markdown
Collaborator

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

T: serde::de::Deserialize<'a>,
{
match serde_json::from_str(self.as_str()?) {
match serde_json::from_slice(self.as_bytes()) {

Copy link
Copy Markdown
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Do we really prefer the serde error over the utf8 error? I'm skeptical the claimed perf difference matters (notably when deserializing a string in the json serde skips utf8 validation if you call from_str whereas has to do it if you call from_slice). I don't have a strong feeling on the error but the commit should explain why we prefer the swap.

Copy link
Copy Markdown
ContributorAuthor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Thanks Matt see below, I have expanded the commit message.

I'm skeptical the claimed perf difference matters

The claim is that a reduction in cache misses leads to non-trivial performance gains.

We still do the same amount of work on the data.

While deserializing, `serde_json::from_slice` validates utf-8 as
needed. So instead of making two passes on the response body, one
to validate utf-8, and another to deserialize the object, we let
`serde_json::from_slice` check utf-8 as needed during deserialization.
Making a single pass over large response bodies reduces the number of
cache misses, and hence decreases the cycles taken to fully deserialize
such responses.
`Response::json` now returns `Error::SerdeJsonError` instead of
`Error::InvalidUtf8InBody` if invalid utf-8 is found during
deserialization.
For this error case, the `Error::SerdeJsonError` inner type
`serde_json::error::Error` is of category
`serde_json::error::Category::Syntax`. Other JSON syntax errors are
also assigned to this category.
We accept this loss of information given the performance gain described
above.
We avoid creating a `String` only to immediately convert it back to its
inner `Vec<u8>`.
This also mirrors the `serde_json::from_slice` call made when parsing a
`Response` body as JSON.
@tankyleo
tankyleoforce-pushed the 26-01-check-utf8-while-flying branch from a3ae780 to 2c3bbf2CompareJanuary 30, 2026 19:08

@TheBlueMattTheBlueMatt left a comment

Copy link
Copy Markdown
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Mmm, fair enough.

ACK 2c3bbf2

@tnull
tnull merged commit cfba70d into rust-bitcoin:masterJan 30, 2026
31 checks passed
Sign up for freeto join this conversation on GitHub. Already have an account? Sign in to comment

Labels

None yet

Projects

None yet

Development

Successfully merging this pull request may close these issues.

3 participants

@tankyleo@tnull@TheBlueMatt
, '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

[bitreq] Check utf-8 while deserializing JSON body - #486

Merged
tnull merged 2 commits into
rust-bitcoin:masterfrom
tankyleo:26-01-check-utf8-while-flying
Jan 30, 2026
Merged

[bitreq] Check utf-8 while deserializing JSON body#486
tnull merged 2 commits into
rust-bitcoin:masterfrom
tankyleo:26-01-check-utf8-while-flying

Conversation

@tankyleo

Copy link
Copy Markdown
Contributor
 [bitreq] Check utf-8 while deserializing JSON body
While deserializing, `serde_json::from_slice` validates utf-8 as
needed. So instead of making two passes on the response body, one
to validate utf-8, and another to deserialize the object, we can
let `serde_json::from_slice` check utf-8 as needed during
deserialization.
`Response::json` now returns `Error::SerdeJsonError` instead of
`Error::InvalidUtf8InBody` if invalid utf-8 bytes are found during
deserialization.

and

 [bitreq] Serialize `Request` body into `Vec<u8>`
We avoid creating a `String` only to immediately convert it back to its
inner `Vec<u8>`.
This also mirrors the `serde_json::from_slice` call made when parsing a
`Response` body as JSON.

@tankyleo

Copy link
Copy Markdown
ContributorAuthor

This came up while me and @tnull were working on migrating to bitreq in lightningdevkit/vss-client#56

@tnulltnull left a comment

Copy link
Copy Markdown
Collaborator

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

T: serde::de::Deserialize<'a>,
{
match serde_json::from_str(self.as_str()?) {
match serde_json::from_slice(self.as_bytes()) {

Copy link
Copy Markdown
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Do we really prefer the serde error over the utf8 error? I'm skeptical the claimed perf difference matters (notably when deserializing a string in the json serde skips utf8 validation if you call from_str whereas has to do it if you call from_slice). I don't have a strong feeling on the error but the commit should explain why we prefer the swap.

Copy link
Copy Markdown
ContributorAuthor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Thanks Matt see below, I have expanded the commit message.

I'm skeptical the claimed perf difference matters

The claim is that a reduction in cache misses leads to non-trivial performance gains.

We still do the same amount of work on the data.

While deserializing, `serde_json::from_slice` validates utf-8 as
needed. So instead of making two passes on the response body, one
to validate utf-8, and another to deserialize the object, we let
`serde_json::from_slice` check utf-8 as needed during deserialization.
Making a single pass over large response bodies reduces the number of
cache misses, and hence decreases the cycles taken to fully deserialize
such responses.
`Response::json` now returns `Error::SerdeJsonError` instead of
`Error::InvalidUtf8InBody` if invalid utf-8 is found during
deserialization.
For this error case, the `Error::SerdeJsonError` inner type
`serde_json::error::Error` is of category
`serde_json::error::Category::Syntax`. Other JSON syntax errors are
also assigned to this category.
We accept this loss of information given the performance gain described
above.
We avoid creating a `String` only to immediately convert it back to its
inner `Vec<u8>`.
This also mirrors the `serde_json::from_slice` call made when parsing a
`Response` body as JSON.
@tankyleo
tankyleoforce-pushed the 26-01-check-utf8-while-flying branch from a3ae780 to 2c3bbf2CompareJanuary 30, 2026 19:08

@TheBlueMattTheBlueMatt left a comment

Copy link
Copy Markdown
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Mmm, fair enough.

ACK 2c3bbf2

@tnull
tnull merged commit cfba70d into rust-bitcoin:masterJan 30, 2026
31 checks passed
Sign up for freeto join this conversation on GitHub. Already have an account? Sign in to comment

Labels

None yet

Projects

None yet

Development

Successfully merging this pull request may close these issues.

3 participants

@tankyleo@tnull@TheBlueMatt
, '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

[bitreq] Check utf-8 while deserializing JSON body - #486

Merged
tnull merged 2 commits into
rust-bitcoin:masterfrom
tankyleo:26-01-check-utf8-while-flying
Jan 30, 2026
Merged

[bitreq] Check utf-8 while deserializing JSON body#486
tnull merged 2 commits into
rust-bitcoin:masterfrom
tankyleo:26-01-check-utf8-while-flying

Conversation

@tankyleo

Copy link
Copy Markdown
Contributor
 [bitreq] Check utf-8 while deserializing JSON body
While deserializing, `serde_json::from_slice` validates utf-8 as
needed. So instead of making two passes on the response body, one
to validate utf-8, and another to deserialize the object, we can
let `serde_json::from_slice` check utf-8 as needed during
deserialization.
`Response::json` now returns `Error::SerdeJsonError` instead of
`Error::InvalidUtf8InBody` if invalid utf-8 bytes are found during
deserialization.

and

 [bitreq] Serialize `Request` body into `Vec<u8>`
We avoid creating a `String` only to immediately convert it back to its
inner `Vec<u8>`.
This also mirrors the `serde_json::from_slice` call made when parsing a
`Response` body as JSON.

@tankyleo

Copy link
Copy Markdown
ContributorAuthor

This came up while me and @tnull were working on migrating to bitreq in lightningdevkit/vss-client#56

@tnulltnull left a comment

Copy link
Copy Markdown
Collaborator

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

T: serde::de::Deserialize<'a>,
{
match serde_json::from_str(self.as_str()?) {
match serde_json::from_slice(self.as_bytes()) {

Copy link
Copy Markdown
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Do we really prefer the serde error over the utf8 error? I'm skeptical the claimed perf difference matters (notably when deserializing a string in the json serde skips utf8 validation if you call from_str whereas has to do it if you call from_slice). I don't have a strong feeling on the error but the commit should explain why we prefer the swap.

Copy link
Copy Markdown
ContributorAuthor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Thanks Matt see below, I have expanded the commit message.

I'm skeptical the claimed perf difference matters

The claim is that a reduction in cache misses leads to non-trivial performance gains.

We still do the same amount of work on the data.

While deserializing, `serde_json::from_slice` validates utf-8 as
needed. So instead of making two passes on the response body, one
to validate utf-8, and another to deserialize the object, we let
`serde_json::from_slice` check utf-8 as needed during deserialization.
Making a single pass over large response bodies reduces the number of
cache misses, and hence decreases the cycles taken to fully deserialize
such responses.
`Response::json` now returns `Error::SerdeJsonError` instead of
`Error::InvalidUtf8InBody` if invalid utf-8 is found during
deserialization.
For this error case, the `Error::SerdeJsonError` inner type
`serde_json::error::Error` is of category
`serde_json::error::Category::Syntax`. Other JSON syntax errors are
also assigned to this category.
We accept this loss of information given the performance gain described
above.
We avoid creating a `String` only to immediately convert it back to its
inner `Vec<u8>`.
This also mirrors the `serde_json::from_slice` call made when parsing a
`Response` body as JSON.
@tankyleo
tankyleoforce-pushed the 26-01-check-utf8-while-flying branch from a3ae780 to 2c3bbf2CompareJanuary 30, 2026 19:08

@TheBlueMattTheBlueMatt left a comment

Copy link
Copy Markdown
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Mmm, fair enough.

ACK 2c3bbf2

@tnull
tnull merged commit cfba70d into rust-bitcoin:masterJan 30, 2026
31 checks passed
Sign up for freeto join this conversation on GitHub. Already have an account? Sign in to comment

Labels

None yet

Projects

None yet

Development

Successfully merging this pull request may close these issues.

3 participants

@tankyleo@tnull@TheBlueMatt
, '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

[bitreq] Check utf-8 while deserializing JSON body - #486

Merged
tnull merged 2 commits into
rust-bitcoin:masterfrom
tankyleo:26-01-check-utf8-while-flying
Jan 30, 2026
Merged

[bitreq] Check utf-8 while deserializing JSON body#486
tnull merged 2 commits into
rust-bitcoin:masterfrom
tankyleo:26-01-check-utf8-while-flying

Conversation

@tankyleo

Copy link
Copy Markdown
Contributor
 [bitreq] Check utf-8 while deserializing JSON body
While deserializing, `serde_json::from_slice` validates utf-8 as
needed. So instead of making two passes on the response body, one
to validate utf-8, and another to deserialize the object, we can
let `serde_json::from_slice` check utf-8 as needed during
deserialization.
`Response::json` now returns `Error::SerdeJsonError` instead of
`Error::InvalidUtf8InBody` if invalid utf-8 bytes are found during
deserialization.

and

 [bitreq] Serialize `Request` body into `Vec<u8>`
We avoid creating a `String` only to immediately convert it back to its
inner `Vec<u8>`.
This also mirrors the `serde_json::from_slice` call made when parsing a
`Response` body as JSON.

@tankyleo

Copy link
Copy Markdown
ContributorAuthor

This came up while me and @tnull were working on migrating to bitreq in lightningdevkit/vss-client#56

@tnulltnull left a comment

Copy link
Copy Markdown
Collaborator

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

T: serde::de::Deserialize<'a>,
{
match serde_json::from_str(self.as_str()?) {
match serde_json::from_slice(self.as_bytes()) {

Copy link
Copy Markdown
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Do we really prefer the serde error over the utf8 error? I'm skeptical the claimed perf difference matters (notably when deserializing a string in the json serde skips utf8 validation if you call from_str whereas has to do it if you call from_slice). I don't have a strong feeling on the error but the commit should explain why we prefer the swap.

Copy link
Copy Markdown
ContributorAuthor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Thanks Matt see below, I have expanded the commit message.

I'm skeptical the claimed perf difference matters

The claim is that a reduction in cache misses leads to non-trivial performance gains.

We still do the same amount of work on the data.

While deserializing, `serde_json::from_slice` validates utf-8 as
needed. So instead of making two passes on the response body, one
to validate utf-8, and another to deserialize the object, we let
`serde_json::from_slice` check utf-8 as needed during deserialization.
Making a single pass over large response bodies reduces the number of
cache misses, and hence decreases the cycles taken to fully deserialize
such responses.
`Response::json` now returns `Error::SerdeJsonError` instead of
`Error::InvalidUtf8InBody` if invalid utf-8 is found during
deserialization.
For this error case, the `Error::SerdeJsonError` inner type
`serde_json::error::Error` is of category
`serde_json::error::Category::Syntax`. Other JSON syntax errors are
also assigned to this category.
We accept this loss of information given the performance gain described
above.
We avoid creating a `String` only to immediately convert it back to its
inner `Vec<u8>`.
This also mirrors the `serde_json::from_slice` call made when parsing a
`Response` body as JSON.
@tankyleo
tankyleoforce-pushed the 26-01-check-utf8-while-flying branch from a3ae780 to 2c3bbf2CompareJanuary 30, 2026 19:08

@TheBlueMattTheBlueMatt left a comment

Copy link
Copy Markdown
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Mmm, fair enough.

ACK 2c3bbf2

@tnull
tnull merged commit cfba70d into rust-bitcoin:masterJan 30, 2026
31 checks passed
Sign up for freeto join this conversation on GitHub. Already have an account? Sign in to comment

Labels

None yet

Projects

None yet

Development

Successfully merging this pull request may close these issues.

3 participants

@tankyleo@tnull@TheBlueMatt
, '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

[bitreq] Check utf-8 while deserializing JSON body - #486

Merged
tnull merged 2 commits into
rust-bitcoin:masterfrom
tankyleo:26-01-check-utf8-while-flying
Jan 30, 2026
Merged

[bitreq] Check utf-8 while deserializing JSON body#486
tnull merged 2 commits into
rust-bitcoin:masterfrom
tankyleo:26-01-check-utf8-while-flying

Conversation

@tankyleo

Copy link
Copy Markdown
Contributor
 [bitreq] Check utf-8 while deserializing JSON body
While deserializing, `serde_json::from_slice` validates utf-8 as
needed. So instead of making two passes on the response body, one
to validate utf-8, and another to deserialize the object, we can
let `serde_json::from_slice` check utf-8 as needed during
deserialization.
`Response::json` now returns `Error::SerdeJsonError` instead of
`Error::InvalidUtf8InBody` if invalid utf-8 bytes are found during
deserialization.

and

 [bitreq] Serialize `Request` body into `Vec<u8>`
We avoid creating a `String` only to immediately convert it back to its
inner `Vec<u8>`.
This also mirrors the `serde_json::from_slice` call made when parsing a
`Response` body as JSON.

@tankyleo

Copy link
Copy Markdown
ContributorAuthor

This came up while me and @tnull were working on migrating to bitreq in lightningdevkit/vss-client#56

@tnulltnull left a comment

Copy link
Copy Markdown
Collaborator

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

T: serde::de::Deserialize<'a>,
{
match serde_json::from_str(self.as_str()?) {
match serde_json::from_slice(self.as_bytes()) {

Copy link
Copy Markdown
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Do we really prefer the serde error over the utf8 error? I'm skeptical the claimed perf difference matters (notably when deserializing a string in the json serde skips utf8 validation if you call from_str whereas has to do it if you call from_slice). I don't have a strong feeling on the error but the commit should explain why we prefer the swap.

Copy link
Copy Markdown
ContributorAuthor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Thanks Matt see below, I have expanded the commit message.

I'm skeptical the claimed perf difference matters

The claim is that a reduction in cache misses leads to non-trivial performance gains.

We still do the same amount of work on the data.

While deserializing, `serde_json::from_slice` validates utf-8 as
needed. So instead of making two passes on the response body, one
to validate utf-8, and another to deserialize the object, we let
`serde_json::from_slice` check utf-8 as needed during deserialization.
Making a single pass over large response bodies reduces the number of
cache misses, and hence decreases the cycles taken to fully deserialize
such responses.
`Response::json` now returns `Error::SerdeJsonError` instead of
`Error::InvalidUtf8InBody` if invalid utf-8 is found during
deserialization.
For this error case, the `Error::SerdeJsonError` inner type
`serde_json::error::Error` is of category
`serde_json::error::Category::Syntax`. Other JSON syntax errors are
also assigned to this category.
We accept this loss of information given the performance gain described
above.
We avoid creating a `String` only to immediately convert it back to its
inner `Vec<u8>`.
This also mirrors the `serde_json::from_slice` call made when parsing a
`Response` body as JSON.
@tankyleo
tankyleoforce-pushed the 26-01-check-utf8-while-flying branch from a3ae780 to 2c3bbf2CompareJanuary 30, 2026 19:08

@TheBlueMattTheBlueMatt left a comment

Copy link
Copy Markdown
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Mmm, fair enough.

ACK 2c3bbf2

@tnull
tnull merged commit cfba70d into rust-bitcoin:masterJan 30, 2026
31 checks passed
Sign up for freeto join this conversation on GitHub. Already have an account? Sign in to comment

Labels

None yet

Projects

None yet

Development

Successfully merging this pull request may close these issues.

3 participants

@tankyleo@tnull@TheBlueMatt
, '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

[bitreq] Check utf-8 while deserializing JSON body - #486

Merged
tnull merged 2 commits into
rust-bitcoin:masterfrom
tankyleo:26-01-check-utf8-while-flying
Jan 30, 2026
Merged

[bitreq] Check utf-8 while deserializing JSON body#486
tnull merged 2 commits into
rust-bitcoin:masterfrom
tankyleo:26-01-check-utf8-while-flying

Conversation

@tankyleo

Copy link
Copy Markdown
Contributor
 [bitreq] Check utf-8 while deserializing JSON body
While deserializing, `serde_json::from_slice` validates utf-8 as
needed. So instead of making two passes on the response body, one
to validate utf-8, and another to deserialize the object, we can
let `serde_json::from_slice` check utf-8 as needed during
deserialization.
`Response::json` now returns `Error::SerdeJsonError` instead of
`Error::InvalidUtf8InBody` if invalid utf-8 bytes are found during
deserialization.

and

 [bitreq] Serialize `Request` body into `Vec<u8>`
We avoid creating a `String` only to immediately convert it back to its
inner `Vec<u8>`.
This also mirrors the `serde_json::from_slice` call made when parsing a
`Response` body as JSON.

@tankyleo

Copy link
Copy Markdown
ContributorAuthor

This came up while me and @tnull were working on migrating to bitreq in lightningdevkit/vss-client#56

@tnulltnull left a comment

Copy link
Copy Markdown
Collaborator

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

T: serde::de::Deserialize<'a>,
{
match serde_json::from_str(self.as_str()?) {
match serde_json::from_slice(self.as_bytes()) {

Copy link
Copy Markdown
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Do we really prefer the serde error over the utf8 error? I'm skeptical the claimed perf difference matters (notably when deserializing a string in the json serde skips utf8 validation if you call from_str whereas has to do it if you call from_slice). I don't have a strong feeling on the error but the commit should explain why we prefer the swap.

Copy link
Copy Markdown
ContributorAuthor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Thanks Matt see below, I have expanded the commit message.

I'm skeptical the claimed perf difference matters

The claim is that a reduction in cache misses leads to non-trivial performance gains.

We still do the same amount of work on the data.

While deserializing, `serde_json::from_slice` validates utf-8 as
needed. So instead of making two passes on the response body, one
to validate utf-8, and another to deserialize the object, we let
`serde_json::from_slice` check utf-8 as needed during deserialization.
Making a single pass over large response bodies reduces the number of
cache misses, and hence decreases the cycles taken to fully deserialize
such responses.
`Response::json` now returns `Error::SerdeJsonError` instead of
`Error::InvalidUtf8InBody` if invalid utf-8 is found during
deserialization.
For this error case, the `Error::SerdeJsonError` inner type
`serde_json::error::Error` is of category
`serde_json::error::Category::Syntax`. Other JSON syntax errors are
also assigned to this category.
We accept this loss of information given the performance gain described
above.
We avoid creating a `String` only to immediately convert it back to its
inner `Vec<u8>`.
This also mirrors the `serde_json::from_slice` call made when parsing a
`Response` body as JSON.
@tankyleo
tankyleoforce-pushed the 26-01-check-utf8-while-flying branch from a3ae780 to 2c3bbf2CompareJanuary 30, 2026 19:08

@TheBlueMattTheBlueMatt left a comment

Copy link
Copy Markdown
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Mmm, fair enough.

ACK 2c3bbf2

@tnull
tnull merged commit cfba70d into rust-bitcoin:masterJan 30, 2026
31 checks passed
Sign up for freeto join this conversation on GitHub. Already have an account? Sign in to comment

Labels

None yet

Projects

None yet

Development

Successfully merging this pull request may close these issues.

3 participants

@tankyleo@tnull@TheBlueMatt
, '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); } })(); })();
Skip to content

[bitreq] Check utf-8 while deserializing JSON body - #486

Merged
tnull merged 2 commits into
rust-bitcoin:masterfrom
tankyleo:26-01-check-utf8-while-flying
Jan 30, 2026
Merged

[bitreq] Check utf-8 while deserializing JSON body#486
tnull merged 2 commits into
rust-bitcoin:masterfrom
tankyleo:26-01-check-utf8-while-flying

Conversation

@tankyleo

Copy link
Copy Markdown
Contributor
 [bitreq] Check utf-8 while deserializing JSON body
While deserializing, `serde_json::from_slice` validates utf-8 as
needed. So instead of making two passes on the response body, one
to validate utf-8, and another to deserialize the object, we can
let `serde_json::from_slice` check utf-8 as needed during
deserialization.
`Response::json` now returns `Error::SerdeJsonError` instead of
`Error::InvalidUtf8InBody` if invalid utf-8 bytes are found during
deserialization.

and

 [bitreq] Serialize `Request` body into `Vec<u8>`
We avoid creating a `String` only to immediately convert it back to its
inner `Vec<u8>`.
This also mirrors the `serde_json::from_slice` call made when parsing a
`Response` body as JSON.

@tankyleo

Copy link
Copy Markdown
ContributorAuthor

This came up while me and @tnull were working on migrating to bitreq in lightningdevkit/vss-client#56

@tnulltnull left a comment

Copy link
Copy Markdown
Collaborator

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

T: serde::de::Deserialize<'a>,
{
match serde_json::from_str(self.as_str()?) {
match serde_json::from_slice(self.as_bytes()) {

Copy link
Copy Markdown
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Do we really prefer the serde error over the utf8 error? I'm skeptical the claimed perf difference matters (notably when deserializing a string in the json serde skips utf8 validation if you call from_str whereas has to do it if you call from_slice). I don't have a strong feeling on the error but the commit should explain why we prefer the swap.

Copy link
Copy Markdown
ContributorAuthor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Thanks Matt see below, I have expanded the commit message.

I'm skeptical the claimed perf difference matters

The claim is that a reduction in cache misses leads to non-trivial performance gains.

We still do the same amount of work on the data.

While deserializing, `serde_json::from_slice` validates utf-8 as
needed. So instead of making two passes on the response body, one
to validate utf-8, and another to deserialize the object, we let
`serde_json::from_slice` check utf-8 as needed during deserialization.
Making a single pass over large response bodies reduces the number of
cache misses, and hence decreases the cycles taken to fully deserialize
such responses.
`Response::json` now returns `Error::SerdeJsonError` instead of
`Error::InvalidUtf8InBody` if invalid utf-8 is found during
deserialization.
For this error case, the `Error::SerdeJsonError` inner type
`serde_json::error::Error` is of category
`serde_json::error::Category::Syntax`. Other JSON syntax errors are
also assigned to this category.
We accept this loss of information given the performance gain described
above.
We avoid creating a `String` only to immediately convert it back to its
inner `Vec<u8>`.
This also mirrors the `serde_json::from_slice` call made when parsing a
`Response` body as JSON.
@tankyleo
tankyleoforce-pushed the 26-01-check-utf8-while-flying branch from a3ae780 to 2c3bbf2CompareJanuary 30, 2026 19:08

@TheBlueMattTheBlueMatt left a comment

Copy link
Copy Markdown
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Mmm, fair enough.

ACK 2c3bbf2

@tnull
tnull merged commit cfba70d into rust-bitcoin:masterJan 30, 2026
31 checks passed
Sign up for freeto join this conversation on GitHub. Already have an account? Sign in to comment

Labels

None yet

Projects

None yet

Development

Successfully merging this pull request may close these issues.

3 participants

@tankyleo@tnull@TheBlueMatt