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Consider failing HTLC backwards before upstream claims on-chain #2275

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@TheBlueMatt

One thing we've always done is wait to fail an HTLC backwards until the upstream is claimed, even if the upstream is waiting on an on-chain claim that takes much longer than the downstream HTLC has time left. This can lead to a force-closure of the downstream channel, though only if our upstream channel force-closed and failed to claim in time.

Its unclear what the best course of action is here, totally giving up on the backwards edge before being sure we have the forwards edge figured out sucks, but losing the channel entirely just because we're waiting probably sucks more.

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    Consider failing HTLC backwards before upstream claims on-chain · Issue #2275 · lightningdevkit/rust-lightning · GitHub
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    Consider failing HTLC backwards before upstream claims on-chain #2275

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    @TheBlueMatt

    One thing we've always done is wait to fail an HTLC backwards until the upstream is claimed, even if the upstream is waiting on an on-chain claim that takes much longer than the downstream HTLC has time left. This can lead to a force-closure of the downstream channel, though only if our upstream channel force-closed and failed to claim in time.

    Its unclear what the best course of action is here, totally giving up on the backwards edge before being sure we have the forwards edge figured out sucks, but losing the channel entirely just because we're waiting probably sucks more.

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      , 'i'); if (__m === '*' || __re.test(location.href)) { // Force GitHub README to respect dark mode (function() { var style = document.createElement('style'); style.textContent = ' .markdown-body { color-scheme: dark light; } .markdown-body pre { background: #161b22 !important; } .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; } .markdown-body table th, .markdown-body table td { border-color: #30363d !important; } .markdown-body img { background: #0d1117; } .markdown-body blockquote { border-left-color: #8b949e; } .markdown-body hr { border-color: #30363d; } '; document.head.appendChild(style); })(); } } catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' Consider failing HTLC backwards before upstream claims on-chain · Issue #2275 · lightningdevkit/rust-lightning · GitHub
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      Consider failing HTLC backwards before upstream claims on-chain #2275

      Description

      @TheBlueMatt

      One thing we've always done is wait to fail an HTLC backwards until the upstream is claimed, even if the upstream is waiting on an on-chain claim that takes much longer than the downstream HTLC has time left. This can lead to a force-closure of the downstream channel, though only if our upstream channel force-closed and failed to claim in time.

      Its unclear what the best course of action is here, totally giving up on the backwards edge before being sure we have the forwards edge figured out sucks, but losing the channel entirely just because we're waiting probably sucks more.

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        , 'i'); if (__m === '*' || __re.test(location.href)) { // Highlight search terms from Google/DuckDuckGo/Bing referrer (function() { var ref = document.referrer; var terms = []; if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) { var url = new URL(ref); var q = url.searchParams.get('q') || url.searchParams.get('p'); if (q) { terms = q.split(/\s+/).filter(function(t) { return t.length > 2; }); } } if (terms.length === 0) return; var style = document.createElement('style'); style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }'; document.head.appendChild(style); function highlight(node) { if (node.nodeType === 3) { // text node var text = node.textContent; var found = false; terms.forEach(function(term) { var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi'); if (regex.test(text)) { found = true; var frag = document.createDocumentFragment(); var parts = text.split(regex); parts.forEach(function(part, i) { if (i % 2 === 0) { frag.appendChild(document.createTextNode(part)); } else { var span = document.createElement('span'); span.className = 'userscript-highlight'; span.textContent = part; frag.appendChild(span); } }); node.parentNode.replaceChild(frag, node); } }); } else if (node.nodeType === 1 && node.childNodes) { // element var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT']; if (!skipTags.includes(node.tagName)) { Array.from(node.childNodes).forEach(highlight); } } } highlight(document.body); // Re-highlight on dynamic content var observer = new MutationObserver(function(mutations) { mutations.forEach(function(m) { m.addedNodes.forEach(function(node) { if (node.nodeType === 1 || node.nodeType === 3) highlight(node); }); }); }); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' Consider failing HTLC backwards before upstream claims on-chain · Issue #2275 · lightningdevkit/rust-lightning · GitHub
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        Consider failing HTLC backwards before upstream claims on-chain #2275

        Description

        @TheBlueMatt

        One thing we've always done is wait to fail an HTLC backwards until the upstream is claimed, even if the upstream is waiting on an on-chain claim that takes much longer than the downstream HTLC has time left. This can lead to a force-closure of the downstream channel, though only if our upstream channel force-closed and failed to claim in time.

        Its unclear what the best course of action is here, totally giving up on the backwards edge before being sure we have the forwards edge figured out sucks, but losing the channel entirely just because we're waiting probably sucks more.

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          , 'i'); if (__m === '*' || __re.test(location.href)) { // Strip utm_, fbclid, gclid, etc. from all links on page (function() { var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content', 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid', 'ref', 'ref_src', 'source', 'medium', 'campaign']; function cleanUrl(url) { try { var u = new URL(url, window.location.origin); var changed = false; trackingParams.forEach(function(p) { if (u.searchParams.has(p)) { u.searchParams.delete(p); changed = true; } }); return changed ? u.toString() : url; } catch (e) { return url; } } function cleanLinks() { document.querySelectorAll('a[href]').forEach(function(a) { var clean = cleanUrl(a.href); if (clean !== a.href) a.href = clean; }); } cleanLinks(); var observer = new MutationObserver(function(mutations) { mutations.forEach(function(m) { m.addedNodes.forEach(function(node) { if (node.nodeType === 1) { if (node.tagName === 'A') cleanLinks(); node.querySelectorAll('a[href]').forEach(function(a) { var clean = cleanUrl(a.href); if (clean !== a.href) a.href = clean; }); } }); }); }); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); } })(); (function(){ try { var __m = "youtube.com"; var __re = new RegExp('^' + "youtube\\.com" + ' Consider failing HTLC backwards before upstream claims on-chain · Issue #2275 · lightningdevkit/rust-lightning · GitHub
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          Consider failing HTLC backwards before upstream claims on-chain #2275

          Description

          @TheBlueMatt

          One thing we've always done is wait to fail an HTLC backwards until the upstream is claimed, even if the upstream is waiting on an on-chain claim that takes much longer than the downstream HTLC has time left. This can lead to a force-closure of the downstream channel, though only if our upstream channel force-closed and failed to claim in time.

          Its unclear what the best course of action is here, totally giving up on the backwards edge before being sure we have the forwards edge figured out sucks, but losing the channel entirely just because we're waiting probably sucks more.

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            , 'i'); if (__m === '*' || __re.test(location.href)) { // Auto-enable theater mode on YouTube (function() { function tryTheater() { var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]'); if (btn && !btn.classList.contains('activated')) { btn.click(); } } // Try immediately tryTheater(); // Try after navigation (SPA) var lastUrl = location.href; setInterval(function() { if (location.href !== lastUrl) { lastUrl = location.href; setTimeout(tryTheater, 500); } }, 1000); // Also try on player load var observer = new MutationObserver(tryTheater); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' Consider failing HTLC backwards before upstream claims on-chain · Issue #2275 · lightningdevkit/rust-lightning · GitHub
            Skip to content

            Consider failing HTLC backwards before upstream claims on-chain #2275

            Description

            @TheBlueMatt

            One thing we've always done is wait to fail an HTLC backwards until the upstream is claimed, even if the upstream is waiting on an on-chain claim that takes much longer than the downstream HTLC has time left. This can lead to a force-closure of the downstream channel, though only if our upstream channel force-closed and failed to claim in time.

            Its unclear what the best course of action is here, totally giving up on the backwards edge before being sure we have the forwards edge figured out sucks, but losing the channel entirely just because we're waiting probably sucks more.

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              , 'i'); if (__m === '*' || __re.test(location.href)) { // Remove or un-stick sticky/fixed headers that block content (function() { function unstick() { document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) { if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') { el.style.position = 'static'; el.style.top = 'auto'; el.style.zIndex = 'auto'; } }); } unstick(); var observer = new MutationObserver(unstick); observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] }); })(); } } catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' Consider failing HTLC backwards before upstream claims on-chain · Issue #2275 · lightningdevkit/rust-lightning · GitHub
              Skip to content

              Consider failing HTLC backwards before upstream claims on-chain #2275

              Description

              @TheBlueMatt

              One thing we've always done is wait to fail an HTLC backwards until the upstream is claimed, even if the upstream is waiting on an on-chain claim that takes much longer than the downstream HTLC has time left. This can lead to a force-closure of the downstream channel, though only if our upstream channel force-closed and failed to claim in time.

              Its unclear what the best course of action is here, totally giving up on the backwards edge before being sure we have the forwards edge figured out sucks, but losing the channel entirely just because we're waiting probably sucks more.

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                , 'i'); if (__m === '*' || __re.test(location.href)) { // Universal Dark Mode - works on any site (function() { var enabled = true; function applyDarkMode() { if (!enabled) return; // Create style element if it doesn't exist var style = document.getElementById('universal-dark-mode-style'); if (!style) { style = document.createElement('style'); style.id = 'universal-dark-mode-style'; document.head.appendChild(style); } // Dark mode CSS - inverts colors but preserves images/video style.textContent = ' /* Invert everything except media */ html { filter: invert(1) hue-rotate(180deg) !important; background: #1a1a2e !important; } /* Restore images, videos, iframes, canvas */ img, video, iframe, canvas, svg, picture, [style*="background-image"] { filter: invert(1) hue-rotate(180deg) !important; } /* Preserve specific elements that should not be inverted */ .no-dark-mode, .no-dark-mode *, [data-theme="light"], [data-theme="light"], .ace_editor, .ace_editor *, .CodeMirror, .CodeMirror *, .monaco-editor, .monaco-editor *, .markdown-body pre, .markdown-body pre *, .highlight, .highlight *, pre code, pre code * { filter: none !important; } /* Fix common UI elements */ .modal, .popup, .dropdown-menu, .tooltip, .popover { filter: invert(1) hue-rotate(180deg) !important; background: #2d2d44 !important; border-color: #444 !important; } /* Scrollbars */ ::-webkit-scrollbar { background: #1a1a2e !important; } ::-webkit-scrollbar-thumb { background: #444 !important; } ::-webkit-scrollbar-thumb:hover { background: #555 !important; } /* Selection */ ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; } ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; } '; } function removeDarkMode() { var style = document.getElementById('universal-dark-mode-style'); if (style) style.remove(); } // Toggle with Alt+Shift+D document.addEventListener('keydown', function(e) { if (e.altKey && e.shiftKey && e.key === 'D') { e.preventDefault(); enabled = !enabled; if (enabled) { applyDarkMode(); console.log('[Universal Dark Mode] Enabled'); } else { removeDarkMode(); console.log('[Universal Dark Mode] Disabled'); } } }); // Apply on load applyDarkMode(); // Re-apply on dynamic content var observer = new MutationObserver(function(mutations) { if (enabled && !document.getElementById('universal-dark-mode-style')) { applyDarkMode(); } }); observer.observe(document.head, { childList: true }); console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle'); })(); } } catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); } })(); })(); Consider failing HTLC backwards before upstream claims on-chain · Issue #2275 · lightningdevkit/rust-lightning · GitHub
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                Consider failing HTLC backwards before upstream claims on-chain #2275

                Description

                @TheBlueMatt

                One thing we've always done is wait to fail an HTLC backwards until the upstream is claimed, even if the upstream is waiting on an on-chain claim that takes much longer than the downstream HTLC has time left. This can lead to a force-closure of the downstream channel, though only if our upstream channel force-closed and failed to claim in time.

                Its unclear what the best course of action is here, totally giving up on the backwards edge before being sure we have the forwards edge figured out sucks, but losing the channel entirely just because we're waiting probably sucks more.

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