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# Sphinx build info version 1
# This file hashes the configuration used when building these files. When it is not found, a full rebuild will be done.
config: 766a535cc0471c7c61f0671fb45a377c
tags: 645f666f9bcd5a90fca523b33c5a78b7

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.. Synapse Developer Documentation documentation master file, created by
sphinx-quickstart on Mon Mar 13 08:59:51 2023.
You can adapt this file completely to your liking, but it should at least
contain the root `toctree` directive.
Welcome to the Synapse Developer Documentation!
===========================================================
.. toctree::
:maxdepth: 2
:caption: Contents:
modules/federation_sender
Indices and tables
==================
* :ref:`genindex`
* :ref:`modindex`
* :ref:`search`

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Federation Sender
=================
```{autodoc2-docstring} synapse.federation.sender
```

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*
* :copyright: Copyright 2007-2023 by the Sphinx team, see AUTHORS.
* :license: BSD, see LICENSE for details.
*
*/
var stopwords = ["a", "and", "are", "as", "at", "be", "but", "by", "for", "if", "in", "into", "is", "it", "near", "no", "not", "of", "on", "or", "such", "that", "the", "their", "then", "there", "these", "they", "this", "to", "was", "will", "with"];
/* Non-minified version is copied as a separate JS file, is available */
/**
* Porter Stemmer
*/
var Stemmer = function() {
var step2list = {
ational: 'ate',
tional: 'tion',
enci: 'ence',
anci: 'ance',
izer: 'ize',
bli: 'ble',
alli: 'al',
entli: 'ent',
eli: 'e',
ousli: 'ous',
ization: 'ize',
ation: 'ate',
ator: 'ate',
alism: 'al',
iveness: 'ive',
fulness: 'ful',
ousness: 'ous',
aliti: 'al',
iviti: 'ive',
biliti: 'ble',
logi: 'log'
};
var step3list = {
icate: 'ic',
ative: '',
alize: 'al',
iciti: 'ic',
ical: 'ic',
ful: '',
ness: ''
};
var c = "[^aeiou]"; // consonant
var v = "[aeiouy]"; // vowel
var C = c + "[^aeiouy]*"; // consonant sequence
var V = v + "[aeiou]*"; // vowel sequence
var mgr0 = "^(" + C + ")?" + V + C; // [C]VC... is m>0
var meq1 = "^(" + C + ")?" + V + C + "(" + V + ")?$"; // [C]VC[V] is m=1
var mgr1 = "^(" + C + ")?" + V + C + V + C; // [C]VCVC... is m>1
var s_v = "^(" + C + ")?" + v; // vowel in stem
this.stemWord = function (w) {
var stem;
var suffix;
var firstch;
var origword = w;
if (w.length < 3)
return w;
var re;
var re2;
var re3;
var re4;
firstch = w.substr(0,1);
if (firstch == "y")
w = firstch.toUpperCase() + w.substr(1);
// Step 1a
re = /^(.+?)(ss|i)es$/;
re2 = /^(.+?)([^s])s$/;
if (re.test(w))
w = w.replace(re,"$1$2");
else if (re2.test(w))
w = w.replace(re2,"$1$2");
// Step 1b
re = /^(.+?)eed$/;
re2 = /^(.+?)(ed|ing)$/;
if (re.test(w)) {
var fp = re.exec(w);
re = new RegExp(mgr0);
if (re.test(fp[1])) {
re = /.$/;
w = w.replace(re,"");
}
}
else if (re2.test(w)) {
var fp = re2.exec(w);
stem = fp[1];
re2 = new RegExp(s_v);
if (re2.test(stem)) {
w = stem;
re2 = /(at|bl|iz)$/;
re3 = new RegExp("([^aeiouylsz])\\1$");
re4 = new RegExp("^" + C + v + "[^aeiouwxy]$");
if (re2.test(w))
w = w + "e";
else if (re3.test(w)) {
re = /.$/;
w = w.replace(re,"");
}
else if (re4.test(w))
w = w + "e";
}
}
// Step 1c
re = /^(.+?)y$/;
if (re.test(w)) {
var fp = re.exec(w);
stem = fp[1];
re = new RegExp(s_v);
if (re.test(stem))
w = stem + "i";
}
// Step 2
re = /^(.+?)(ational|tional|enci|anci|izer|bli|alli|entli|eli|ousli|ization|ation|ator|alism|iveness|fulness|ousness|aliti|iviti|biliti|logi)$/;
if (re.test(w)) {
var fp = re.exec(w);
stem = fp[1];
suffix = fp[2];
re = new RegExp(mgr0);
if (re.test(stem))
w = stem + step2list[suffix];
}
// Step 3
re = /^(.+?)(icate|ative|alize|iciti|ical|ful|ness)$/;
if (re.test(w)) {
var fp = re.exec(w);
stem = fp[1];
suffix = fp[2];
re = new RegExp(mgr0);
if (re.test(stem))
w = stem + step3list[suffix];
}
// Step 4
re = /^(.+?)(al|ance|ence|er|ic|able|ible|ant|ement|ment|ent|ou|ism|ate|iti|ous|ive|ize)$/;
re2 = /^(.+?)(s|t)(ion)$/;
if (re.test(w)) {
var fp = re.exec(w);
stem = fp[1];
re = new RegExp(mgr1);
if (re.test(stem))
w = stem;
}
else if (re2.test(w)) {
var fp = re2.exec(w);
stem = fp[1] + fp[2];
re2 = new RegExp(mgr1);
if (re2.test(stem))
w = stem;
}
// Step 5
re = /^(.+?)e$/;
if (re.test(w)) {
var fp = re.exec(w);
stem = fp[1];
re = new RegExp(mgr1);
re2 = new RegExp(meq1);
re3 = new RegExp("^" + C + v + "[^aeiouwxy]$");
if (re.test(stem) || (re2.test(stem) && !(re3.test(stem))))
w = stem;
}
re = /ll$/;
re2 = new RegExp(mgr1);
if (re.test(w) && re2.test(w)) {
re = /.$/;
w = w.replace(re,"");
}
// and turn initial Y back to y
if (firstch == "y")
w = firstch.toLowerCase() + w.substr(1);
return w;
}
}

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body:not([data-theme="light"]) .highlight .no { color: #40ffff } /* Name.Constant */
body:not([data-theme="light"]) .highlight .nd { color: #ffa500 } /* Name.Decorator */
body:not([data-theme="light"]) .highlight .ni { color: #d0d0d0 } /* Name.Entity */
body:not([data-theme="light"]) .highlight .ne { color: #bbbbbb } /* Name.Exception */
body:not([data-theme="light"]) .highlight .nf { color: #71adff } /* Name.Function */
body:not([data-theme="light"]) .highlight .nl { color: #d0d0d0 } /* Name.Label */
body:not([data-theme="light"]) .highlight .nn { color: #71adff; text-decoration: underline } /* Name.Namespace */
body:not([data-theme="light"]) .highlight .nx { color: #d0d0d0 } /* Name.Other */
body:not([data-theme="light"]) .highlight .py { color: #d0d0d0 } /* Name.Property */
body:not([data-theme="light"]) .highlight .nt { color: #6ebf26; font-weight: bold } /* Name.Tag */
body:not([data-theme="light"]) .highlight .nv { color: #40ffff } /* Name.Variable */
body:not([data-theme="light"]) .highlight .ow { color: #6ebf26; font-weight: bold } /* Operator.Word */
body:not([data-theme="light"]) .highlight .pm { color: #d0d0d0 } /* Punctuation.Marker */
body:not([data-theme="light"]) .highlight .w { color: #666666 } /* Text.Whitespace */
body:not([data-theme="light"]) .highlight .mb { color: #51b2fd } /* Literal.Number.Bin */
body:not([data-theme="light"]) .highlight .mf { color: #51b2fd } /* Literal.Number.Float */
body:not([data-theme="light"]) .highlight .mh { color: #51b2fd } /* Literal.Number.Hex */
body:not([data-theme="light"]) .highlight .mi { color: #51b2fd } /* Literal.Number.Integer */
body:not([data-theme="light"]) .highlight .mo { color: #51b2fd } /* Literal.Number.Oct */
body:not([data-theme="light"]) .highlight .sa { color: #ed9d13 } /* Literal.String.Affix */
body:not([data-theme="light"]) .highlight .sb { color: #ed9d13 } /* Literal.String.Backtick */
body:not([data-theme="light"]) .highlight .sc { color: #ed9d13 } /* Literal.String.Char */
body:not([data-theme="light"]) .highlight .dl { color: #ed9d13 } /* Literal.String.Delimiter */
body:not([data-theme="light"]) .highlight .sd { color: #ed9d13 } /* Literal.String.Doc */
body:not([data-theme="light"]) .highlight .s2 { color: #ed9d13 } /* Literal.String.Double */
body:not([data-theme="light"]) .highlight .se { color: #ed9d13 } /* Literal.String.Escape */
body:not([data-theme="light"]) .highlight .sh { color: #ed9d13 } /* Literal.String.Heredoc */
body:not([data-theme="light"]) .highlight .si { color: #ed9d13 } /* Literal.String.Interpol */
body:not([data-theme="light"]) .highlight .sx { color: #ffa500 } /* Literal.String.Other */
body:not([data-theme="light"]) .highlight .sr { color: #ed9d13 } /* Literal.String.Regex */
body:not([data-theme="light"]) .highlight .s1 { color: #ed9d13 } /* Literal.String.Single */
body:not([data-theme="light"]) .highlight .ss { color: #ed9d13 } /* Literal.String.Symbol */
body:not([data-theme="light"]) .highlight .bp { color: #2fbccd } /* Name.Builtin.Pseudo */
body:not([data-theme="light"]) .highlight .fm { color: #71adff } /* Name.Function.Magic */
body:not([data-theme="light"]) .highlight .vc { color: #40ffff } /* Name.Variable.Class */
body:not([data-theme="light"]) .highlight .vg { color: #40ffff } /* Name.Variable.Global */
body:not([data-theme="light"]) .highlight .vi { color: #40ffff } /* Name.Variable.Instance */
body:not([data-theme="light"]) .highlight .vm { color: #40ffff } /* Name.Variable.Magic */
body:not([data-theme="light"]) .highlight .il { color: #51b2fd } /* Literal.Number.Integer.Long */
}
}

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/*!
* gumshoejs v5.1.2 (patched by @pradyunsg)
* A simple, framework-agnostic scrollspy script.
* (c) 2019 Chris Ferdinandi
* MIT License
* http://github.com/cferdinandi/gumshoe
*/

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/*
* searchtools.js
* ~~~~~~~~~~~~~~~~
*
* Sphinx JavaScript utilities for the full-text search.
*
* :copyright: Copyright 2007-2023 by the Sphinx team, see AUTHORS.
* :license: BSD, see LICENSE for details.
*
*/
"use strict";
/**
* Simple result scoring code.
*/
if (typeof Scorer === "undefined") {
var Scorer = {
// Implement the following function to further tweak the score for each result
// The function takes a result array [docname, title, anchor, descr, score, filename]
// and returns the new score.
/*
score: result => {
const [docname, title, anchor, descr, score, filename] = result
return score
},
*/
// query matches the full name of an object
objNameMatch: 11,
// or matches in the last dotted part of the object name
objPartialMatch: 6,
// Additive scores depending on the priority of the object
objPrio: {
0: 15, // used to be importantResults
1: 5, // used to be objectResults
2: -5, // used to be unimportantResults
},
// Used when the priority is not in the mapping.
objPrioDefault: 0,
// query found in title
title: 15,
partialTitle: 7,
// query found in terms
term: 5,
partialTerm: 2,
};
}
const _removeChildren = (element) => {
while (element && element.lastChild) element.removeChild(element.lastChild);
};
/**
* See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions#escaping
*/
const _escapeRegExp = (string) =>
string.replace(/[.*+\-?^${}()|[\]\\]/g, "\\$&"); // $& means the whole matched string
const _displayItem = (item, searchTerms) => {
const docBuilder = DOCUMENTATION_OPTIONS.BUILDER;
const docUrlRoot = DOCUMENTATION_OPTIONS.URL_ROOT;
const docFileSuffix = DOCUMENTATION_OPTIONS.FILE_SUFFIX;
const docLinkSuffix = DOCUMENTATION_OPTIONS.LINK_SUFFIX;
const showSearchSummary = DOCUMENTATION_OPTIONS.SHOW_SEARCH_SUMMARY;
const [docName, title, anchor, descr, score, _filename] = item;
let listItem = document.createElement("li");
let requestUrl;
let linkUrl;
if (docBuilder === "dirhtml") {
// dirhtml builder
let dirname = docName + "/";
if (dirname.match(/\/index\/$/))
dirname = dirname.substring(0, dirname.length - 6);
else if (dirname === "index/") dirname = "";
requestUrl = docUrlRoot + dirname;
linkUrl = requestUrl;
} else {
// normal html builders
requestUrl = docUrlRoot + docName + docFileSuffix;
linkUrl = docName + docLinkSuffix;
}
let linkEl = listItem.appendChild(document.createElement("a"));
linkEl.href = linkUrl + anchor;
linkEl.dataset.score = score;
linkEl.innerHTML = title;
if (descr)
listItem.appendChild(document.createElement("span")).innerHTML =
" (" + descr + ")";
else if (showSearchSummary)
fetch(requestUrl)
.then((responseData) => responseData.text())
.then((data) => {
if (data)
listItem.appendChild(
Search.makeSearchSummary(data, searchTerms)
);
});
Search.output.appendChild(listItem);
};
const _finishSearch = (resultCount) => {
Search.stopPulse();
Search.title.innerText = _("Search Results");
if (!resultCount)
Search.status.innerText = Documentation.gettext(
"Your search did not match any documents. Please make sure that all words are spelled correctly and that you've selected enough categories."
);
else
Search.status.innerText = _(
`Search finished, found ${resultCount} page(s) matching the search query.`
);
};
const _displayNextItem = (
results,
resultCount,
searchTerms
) => {
// results left, load the summary and display it
// this is intended to be dynamic (don't sub resultsCount)
if (results.length) {
_displayItem(results.pop(), searchTerms);
setTimeout(
() => _displayNextItem(results, resultCount, searchTerms),
5
);
}
// search finished, update title and status message
else _finishSearch(resultCount);
};
/**
* Default splitQuery function. Can be overridden in ``sphinx.search`` with a
* custom function per language.
*
* The regular expression works by splitting the string on consecutive characters
* that are not Unicode letters, numbers, underscores, or emoji characters.
* This is the same as ``\W+`` in Python, preserving the surrogate pair area.
*/
if (typeof splitQuery === "undefined") {
var splitQuery = (query) => query
.split(/[^\p{Letter}\p{Number}_\p{Emoji_Presentation}]+/gu)
.filter(term => term) // remove remaining empty strings
}
/**
* Search Module
*/
const Search = {
_index: null,
_queued_query: null,
_pulse_status: -1,
htmlToText: (htmlString) => {
const htmlElement = new DOMParser().parseFromString(htmlString, 'text/html');
htmlElement.querySelectorAll(".headerlink").forEach((el) => { el.remove() });
const docContent = htmlElement.querySelector('[role="main"]');
if (docContent !== undefined) return docContent.textContent;
console.warn(
"Content block not found. Sphinx search tries to obtain it via '[role=main]'. Could you check your theme or template."
);
return "";
},
init: () => {
const query = new URLSearchParams(window.location.search).get("q");
document
.querySelectorAll('input[name="q"]')
.forEach((el) => (el.value = query));
if (query) Search.performSearch(query);
},
loadIndex: (url) =>
(document.body.appendChild(document.createElement("script")).src = url),
setIndex: (index) => {
Search._index = index;
if (Search._queued_query !== null) {
const query = Search._queued_query;
Search._queued_query = null;
Search.query(query);
}
},
hasIndex: () => Search._index !== null,
deferQuery: (query) => (Search._queued_query = query),
stopPulse: () => (Search._pulse_status = -1),
startPulse: () => {
if (Search._pulse_status >= 0) return;
const pulse = () => {
Search._pulse_status = (Search._pulse_status + 1) % 4;
Search.dots.innerText = ".".repeat(Search._pulse_status);
if (Search._pulse_status >= 0) window.setTimeout(pulse, 500);
};
pulse();
},
/**
* perform a search for something (or wait until index is loaded)
*/
performSearch: (query) => {
// create the required interface elements
const searchText = document.createElement("h2");
searchText.textContent = _("Searching");
const searchSummary = document.createElement("p");
searchSummary.classList.add("search-summary");
searchSummary.innerText = "";
const searchList = document.createElement("ul");
searchList.classList.add("search");
const out = document.getElementById("search-results");
Search.title = out.appendChild(searchText);
Search.dots = Search.title.appendChild(document.createElement("span"));
Search.status = out.appendChild(searchSummary);
Search.output = out.appendChild(searchList);
const searchProgress = document.getElementById("search-progress");
// Some themes don't use the search progress node
if (searchProgress) {
searchProgress.innerText = _("Preparing search...");
}
Search.startPulse();
// index already loaded, the browser was quick!
if (Search.hasIndex()) Search.query(query);
else Search.deferQuery(query);
},
/**
* execute search (requires search index to be loaded)
*/
query: (query) => {
const filenames = Search._index.filenames;
const docNames = Search._index.docnames;
const titles = Search._index.titles;
const allTitles = Search._index.alltitles;
const indexEntries = Search._index.indexentries;
// stem the search terms and add them to the correct list
const stemmer = new Stemmer();
const searchTerms = new Set();
const excludedTerms = new Set();
const highlightTerms = new Set();
const objectTerms = new Set(splitQuery(query.toLowerCase().trim()));
splitQuery(query.trim()).forEach((queryTerm) => {
const queryTermLower = queryTerm.toLowerCase();
// maybe skip this "word"
// stopwords array is from language_data.js
if (
stopwords.indexOf(queryTermLower) !== -1 ||
queryTerm.match(/^\d+$/)
)
return;
// stem the word
let word = stemmer.stemWord(queryTermLower);
// select the correct list
if (word[0] === "-") excludedTerms.add(word.substr(1));
else {
searchTerms.add(word);
highlightTerms.add(queryTermLower);
}
});
if (SPHINX_HIGHLIGHT_ENABLED) { // set in sphinx_highlight.js
localStorage.setItem("sphinx_highlight_terms", [...highlightTerms].join(" "))
}
// console.debug("SEARCH: searching for:");
// console.info("required: ", [...searchTerms]);
// console.info("excluded: ", [...excludedTerms]);
// array of [docname, title, anchor, descr, score, filename]
let results = [];
_removeChildren(document.getElementById("search-progress"));
const queryLower = query.toLowerCase();
for (const [title, foundTitles] of Object.entries(allTitles)) {
if (title.toLowerCase().includes(queryLower) && (queryLower.length >= title.length/2)) {
for (const [file, id] of foundTitles) {
let score = Math.round(100 * queryLower.length / title.length)
results.push([
docNames[file],
titles[file] !== title ? `${titles[file]} > ${title}` : title,
id !== null ? "#" + id : "",
null,
score,
filenames[file],
]);
}
}
}
// search for explicit entries in index directives
for (const [entry, foundEntries] of Object.entries(indexEntries)) {
if (entry.includes(queryLower) && (queryLower.length >= entry.length/2)) {
for (const [file, id] of foundEntries) {
let score = Math.round(100 * queryLower.length / entry.length)
results.push([
docNames[file],
titles[file],
id ? "#" + id : "",
null,
score,
filenames[file],
]);
}
}
}
// lookup as object
objectTerms.forEach((term) =>
results.push(...Search.performObjectSearch(term, objectTerms))
);
// lookup as search terms in fulltext
results.push(...Search.performTermsSearch(searchTerms, excludedTerms));
// let the scorer override scores with a custom scoring function
if (Scorer.score) results.forEach((item) => (item[4] = Scorer.score(item)));
// now sort the results by score (in opposite order of appearance, since the
// display function below uses pop() to retrieve items) and then
// alphabetically
results.sort((a, b) => {
const leftScore = a[4];
const rightScore = b[4];
if (leftScore === rightScore) {
// same score: sort alphabetically
const leftTitle = a[1].toLowerCase();
const rightTitle = b[1].toLowerCase();
if (leftTitle === rightTitle) return 0;
return leftTitle > rightTitle ? -1 : 1; // inverted is intentional
}
return leftScore > rightScore ? 1 : -1;
});
// remove duplicate search results
// note the reversing of results, so that in the case of duplicates, the highest-scoring entry is kept
let seen = new Set();
results = results.reverse().reduce((acc, result) => {
let resultStr = result.slice(0, 4).concat([result[5]]).map(v => String(v)).join(',');
if (!seen.has(resultStr)) {
acc.push(result);
seen.add(resultStr);
}
return acc;
}, []);
results = results.reverse();
// for debugging
//Search.lastresults = results.slice(); // a copy
// console.info("search results:", Search.lastresults);
// print the results
_displayNextItem(results, results.length, searchTerms);
},
/**
* search for object names
*/
performObjectSearch: (object, objectTerms) => {
const filenames = Search._index.filenames;
const docNames = Search._index.docnames;
const objects = Search._index.objects;
const objNames = Search._index.objnames;
const titles = Search._index.titles;
const results = [];
const objectSearchCallback = (prefix, match) => {
const name = match[4]
const fullname = (prefix ? prefix + "." : "") + name;
const fullnameLower = fullname.toLowerCase();
if (fullnameLower.indexOf(object) < 0) return;
let score = 0;
const parts = fullnameLower.split(".");
// check for different match types: exact matches of full name or
// "last name" (i.e. last dotted part)
if (fullnameLower === object || parts.slice(-1)[0] === object)
score += Scorer.objNameMatch;
else if (parts.slice(-1)[0].indexOf(object) > -1)
score += Scorer.objPartialMatch; // matches in last name
const objName = objNames[match[1]][2];
const title = titles[match[0]];
// If more than one term searched for, we require other words to be
// found in the name/title/description
const otherTerms = new Set(objectTerms);
otherTerms.delete(object);
if (otherTerms.size > 0) {
const haystack = `${prefix} ${name} ${objName} ${title}`.toLowerCase();
if (
[...otherTerms].some((otherTerm) => haystack.indexOf(otherTerm) < 0)
)
return;
}
let anchor = match[3];
if (anchor === "") anchor = fullname;
else if (anchor === "-") anchor = objNames[match[1]][1] + "-" + fullname;
const descr = objName + _(", in ") + title;
// add custom score for some objects according to scorer
if (Scorer.objPrio.hasOwnProperty(match[2]))
score += Scorer.objPrio[match[2]];
else score += Scorer.objPrioDefault;
results.push([
docNames[match[0]],
fullname,
"#" + anchor,
descr,
score,
filenames[match[0]],
]);
};
Object.keys(objects).forEach((prefix) =>
objects[prefix].forEach((array) =>
objectSearchCallback(prefix, array)
)
);
return results;
},
/**
* search for full-text terms in the index
*/
performTermsSearch: (searchTerms, excludedTerms) => {
// prepare search
const terms = Search._index.terms;
const titleTerms = Search._index.titleterms;
const filenames = Search._index.filenames;
const docNames = Search._index.docnames;
const titles = Search._index.titles;
const scoreMap = new Map();
const fileMap = new Map();
// perform the search on the required terms
searchTerms.forEach((word) => {
const files = [];
const arr = [
{ files: terms[word], score: Scorer.term },
{ files: titleTerms[word], score: Scorer.title },
];
// add support for partial matches
if (word.length > 2) {
const escapedWord = _escapeRegExp(word);
Object.keys(terms).forEach((term) => {
if (term.match(escapedWord) && !terms[word])
arr.push({ files: terms[term], score: Scorer.partialTerm });
});
Object.keys(titleTerms).forEach((term) => {
if (term.match(escapedWord) && !titleTerms[word])
arr.push({ files: titleTerms[word], score: Scorer.partialTitle });
});
}
// no match but word was a required one
if (arr.every((record) => record.files === undefined)) return;
// found search word in contents
arr.forEach((record) => {
if (record.files === undefined) return;
let recordFiles = record.files;
if (recordFiles.length === undefined) recordFiles = [recordFiles];
files.push(...recordFiles);
// set score for the word in each file
recordFiles.forEach((file) => {
if (!scoreMap.has(file)) scoreMap.set(file, {});
scoreMap.get(file)[word] = record.score;
});
});
// create the mapping
files.forEach((file) => {
if (fileMap.has(file) && fileMap.get(file).indexOf(word) === -1)
fileMap.get(file).push(word);
else fileMap.set(file, [word]);
});
});
// now check if the files don't contain excluded terms
const results = [];
for (const [file, wordList] of fileMap) {
// check if all requirements are matched
// as search terms with length < 3 are discarded
const filteredTermCount = [...searchTerms].filter(
(term) => term.length > 2
).length;
if (
wordList.length !== searchTerms.size &&
wordList.length !== filteredTermCount
)
continue;
// ensure that none of the excluded terms is in the search result
if (
[...excludedTerms].some(
(term) =>
terms[term] === file ||
titleTerms[term] === file ||
(terms[term] || []).includes(file) ||
(titleTerms[term] || []).includes(file)
)
)
break;
// select one (max) score for the file.
const score = Math.max(...wordList.map((w) => scoreMap.get(file)[w]));
// add result to the result list
results.push([
docNames[file],
titles[file],
"",
null,
score,
filenames[file],
]);
}
return results;
},
/**
* helper function to return a node containing the
* search summary for a given text. keywords is a list
* of stemmed words.
*/
makeSearchSummary: (htmlText, keywords) => {
const text = Search.htmlToText(htmlText);
if (text === "") return null;
const textLower = text.toLowerCase();
const actualStartPosition = [...keywords]
.map((k) => textLower.indexOf(k.toLowerCase()))
.filter((i) => i > -1)
.slice(-1)[0];
const startWithContext = Math.max(actualStartPosition - 120, 0);
const top = startWithContext === 0 ? "" : "...";
const tail = startWithContext + 240 < text.length ? "..." : "";
let summary = document.createElement("p");
summary.classList.add("context");
summary.textContent = top + text.substr(startWithContext, 240).trim() + tail;
return summary;
},
};
_ready(Search.init);

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/* Some sane resets. */
html {
height: 100%;
}
body {
margin: 0;
min-height: 100%;
}
/* All the flexbox magic! */
body,
.sb-announcement,
.sb-content,
.sb-main,
.sb-container,
.sb-container__inner,
.sb-article-container,
.sb-footer-content,
.sb-header,
.sb-header-secondary,
.sb-footer {
display: flex;
}
/* These order things vertically */
body,
.sb-main,
.sb-article-container {
flex-direction: column;
}
/* Put elements in the center */
.sb-header,
.sb-header-secondary,
.sb-container,
.sb-content,
.sb-footer,
.sb-footer-content {
justify-content: center;
}
/* Put elements at the ends */
.sb-article-container {
justify-content: space-between;
}
/* These elements grow. */
.sb-main,
.sb-content,
.sb-container,
article {
flex-grow: 1;
}
/* Because padding making this wider is not fun */
article {
box-sizing: border-box;
}
/* The announcements element should never be wider than the page. */
.sb-announcement {
max-width: 100%;
}
.sb-sidebar-primary,
.sb-sidebar-secondary {
flex-shrink: 0;
width: 17rem;
}
.sb-announcement__inner {
justify-content: center;
box-sizing: border-box;
height: 3rem;
overflow-x: auto;
white-space: nowrap;
}
/* Sidebars, with checkbox-based toggle */
.sb-sidebar-primary,
.sb-sidebar-secondary {
position: fixed;
height: 100%;
top: 0;
}
.sb-sidebar-primary {
left: -17rem;
transition: left 250ms ease-in-out;
}
.sb-sidebar-secondary {
right: -17rem;
transition: right 250ms ease-in-out;
}
.sb-sidebar-toggle {
display: none;
}
.sb-sidebar-overlay {
position: fixed;
top: 0;
width: 0;
height: 0;
transition: width 0ms ease 250ms, height 0ms ease 250ms, opacity 250ms ease;
opacity: 0;
background-color: rgba(0, 0, 0, 0.54);
}
#sb-sidebar-toggle--primary:checked
~ .sb-sidebar-overlay[for="sb-sidebar-toggle--primary"],
#sb-sidebar-toggle--secondary:checked
~ .sb-sidebar-overlay[for="sb-sidebar-toggle--secondary"] {
width: 100%;
height: 100%;
opacity: 1;
transition: width 0ms ease, height 0ms ease, opacity 250ms ease;
}
#sb-sidebar-toggle--primary:checked ~ .sb-container .sb-sidebar-primary {
left: 0;
}
#sb-sidebar-toggle--secondary:checked ~ .sb-container .sb-sidebar-secondary {
right: 0;
}
/* Full-width mode */
.drop-secondary-sidebar-for-full-width-content
.hide-when-secondary-sidebar-shown {
display: none !important;
}
.drop-secondary-sidebar-for-full-width-content .sb-sidebar-secondary {
display: none !important;
}
/* Mobile views */
.sb-page-width {
width: 100%;
}
.sb-article-container,
.sb-footer-content__inner,
.drop-secondary-sidebar-for-full-width-content .sb-article,
.drop-secondary-sidebar-for-full-width-content .match-content-width {
width: 100vw;
}
.sb-article,
.match-content-width {
padding: 0 1rem;
box-sizing: border-box;
}
@media (min-width: 32rem) {
.sb-article,
.match-content-width {
padding: 0 2rem;
}
}
/* Tablet views */
@media (min-width: 42rem) {
.sb-article-container {
width: auto;
}
.sb-footer-content__inner,
.drop-secondary-sidebar-for-full-width-content .sb-article,
.drop-secondary-sidebar-for-full-width-content .match-content-width {
width: 42rem;
}
.sb-article,
.match-content-width {
width: 42rem;
}
}
@media (min-width: 46rem) {
.sb-footer-content__inner,
.drop-secondary-sidebar-for-full-width-content .sb-article,
.drop-secondary-sidebar-for-full-width-content .match-content-width {
width: 46rem;
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<section id="federation-sender">
<h1>Federation Sender<a class="headerlink" href="#federation-sender" title="Permalink to this heading">#</a></h1>
<p>The Federation Sender is responsible for sending Persistent Data Units (PDUs)
and Ephemeral Data Units (EDUs) to other homeservers using
the <code class="docutils literal notranslate"><span class="pre">/send</span></code> Federation API.</p>
<h2 class="rubric" id="how-do-pdus-get-sent">How do PDUs get sent?</h2>
<p>The Federation Sender is made aware of new PDUs due to <code class="docutils literal notranslate"><span class="pre">FederationSender.notify_new_events</span></code>.
When the sender is notified about a newly-persisted PDU that originates from this homeserver
and is not an out-of-band event, we pass the PDU to the <code class="docutils literal notranslate"><span class="pre">_PerDestinationQueue</span></code> for each
remote homeserver that is in the room at that point in the DAG.</p>
<h3 class="rubric" id="per-destination-queues">Per-Destination Queues</h3>
<p>There is one <code class="docutils literal notranslate"><span class="pre">PerDestinationQueue</span></code> per destination homeserver.
The <code class="docutils literal notranslate"><span class="pre">PerDestinationQueue</span></code> maintains the following information about the destination:</p>
<ul class="simple">
<li><p>whether the destination is currently in <a class="reference internal" href="#catch-up-mode"><span class="xref myst">catch-up mode (see below)</span></a>;</p></li>
<li><p>a queue of PDUs to be sent to the destination; and</p></li>
<li><p>a queue of EDUs to be sent to the destination (not considered in this section).</p></li>
</ul>
<p>Upon a new PDU being enqueued, <code class="docutils literal notranslate"><span class="pre">attempt_new_transaction</span></code> is called to start a new
transaction if there is not already one in progress.</p>
<h3 class="rubric" id="transactions-and-the-transaction-transmission-loop">Transactions and the Transaction Transmission Loop</h3>
<p>Each federation HTTP request to the <code class="docutils literal notranslate"><span class="pre">/send</span></code> endpoint is referred to as a transaction.
The body of the HTTP request contains a list of PDUs and EDUs to send to the destination.</p>
<p>The <em>Transaction Transmission Loop</em> (<code class="docutils literal notranslate"><span class="pre">_transaction_transmission_loop</span></code>) is responsible
for emptying the queued PDUs (and EDUs) from a <code class="docutils literal notranslate"><span class="pre">PerDestinationQueue</span></code> by sending
them to the destination.</p>
<p>There can only be one transaction in flight for a given destination at any time.
(Other than preventing us from overloading the destination, this also makes it easier to
reason about because we process events sequentially for each destination.
This is useful for <em>Catch-Up Mode</em>, described later.)</p>
<p>The loop continues so long as there is anything to send. At each iteration of the loop, we:</p>
<ul class="simple">
<li><p>dequeue up to 50 PDUs (and up to 100 EDUs).</p></li>
<li><p>make the <code class="docutils literal notranslate"><span class="pre">/send</span></code> request to the destination homeserver with the dequeued PDUs and EDUs.</p></li>
<li><p>if successful, make note of the fact that we succeeded in transmitting PDUs up to
the given <code class="docutils literal notranslate"><span class="pre">stream_ordering</span></code> of the latest PDU by</p></li>
<li><p>if unsuccessful, back off from the remote homeserver for some time.
If we have been unsuccessful for too long (when the backoff interval grows to exceed 1 hour),
the in-memory queues are emptied and we enter <a class="reference internal" href="#catch-up-mode"><span class="xref myst"><em>Catch-Up Mode</em>, described below</span></a>.</p></li>
</ul>
<h3 class="rubric" id="catch-up-mode">Catch-Up Mode</h3>
<p>When the <code class="docutils literal notranslate"><span class="pre">PerDestinationQueue</span></code> has the catch-up flag set, the <em>Catch-Up Transmission Loop</em>
(<code class="docutils literal notranslate"><span class="pre">_catch_up_transmission_loop</span></code>) is used in lieu of the regular <code class="docutils literal notranslate"><span class="pre">_transaction_transmission_loop</span></code>.
(Only once the catch-up mode has been exited can the regular tranaction transmission behaviour
be resumed.)</p>
<p><em>Catch-Up Mode</em>, entered upon Synapse startup or once a homeserver has fallen behind due to
connection problems, is responsible for sending PDUs that have been missed by the destination
homeserver. (PDUs can be missed because the <code class="docutils literal notranslate"><span class="pre">PerDestinationQueue</span></code> is volatile — i.e. resets
on startup — and it does not hold PDUs forever if <code class="docutils literal notranslate"><span class="pre">/send</span></code> requests to the destination fail.)</p>
<p>The catch-up mechanism makes use of the <code class="docutils literal notranslate"><span class="pre">last_successful_stream_ordering</span></code> column in the
<code class="docutils literal notranslate"><span class="pre">destinations</span></code> table (which gives the <code class="docutils literal notranslate"><span class="pre">stream_ordering</span></code> of the most recent successfully
sent PDU) and the <code class="docutils literal notranslate"><span class="pre">stream_ordering</span></code> column in the <code class="docutils literal notranslate"><span class="pre">destination_rooms</span></code> table (which gives,
for each room, the <code class="docutils literal notranslate"><span class="pre">stream_ordering</span></code> of the most recent PDU that needs to be sent to this
destination).</p>
<p>Each iteration of the loop pulls out 50 <code class="docutils literal notranslate"><span class="pre">destination_rooms</span></code> entries with the oldest
<code class="docutils literal notranslate"><span class="pre">stream_ordering</span></code>s that are greater than the <code class="docutils literal notranslate"><span class="pre">last_successful_stream_ordering</span></code>.
In other words, from the set of latest PDUs in each room to be sent to the destination,
the 50 oldest such PDUs are pulled out.</p>
<p>These PDUs could, in principle, now be directly sent to the destination. However, as an
optimisation intended to prevent overloading destination homeservers, we instead attempt
to send the latest forward extremities so long as the destination homeserver is still
eligible to receive those.
This reduces load on the destination <strong>in aggregate</strong> because all Synapse homeservers
will behave according to this principle and therefore avoid sending lots of different PDUs
at different points in the DAG to a recovering homeserver.
<em>This optimisation is not currently valid in rooms which are partial-state on this homeserver,
since we are unable to determine whether the destination homeserver is eligible to receive
the latest forward extremities unless this homeserver sent those PDUs — in this case, we
just send the latest PDUs originating from this server and skip this optimisation.</em></p>
<p>Whilst PDUs are sent through this mechanism, the position of <code class="docutils literal notranslate"><span class="pre">last_successful_stream_ordering</span></code>
is advanced as normal.
Once there are no longer any rooms containing outstanding PDUs to be sent to the destination
<em>that are not already in the <code class="docutils literal notranslate"><span class="pre">PerDestinationQueue</span></code> because they arrived since Catch-Up Mode
was enabled</em>, Catch-Up Mode is exited and we return to <code class="docutils literal notranslate"><span class="pre">_transaction_transmission_loop</span></code>.</p>
<h4 class="rubric" id="a-note-on-failures-and-back-offs">A note on failures and back-offs</h4>
<p>If a remote server is unreachable over federation, we back off from that server,
with an exponentially-increasing retry interval.
Whilst we dont automatically retry after the interval, we prevent making new attempts
until such time as the back-off has cleared.
Once the back-off is cleared and a new PDU or EDU arrives for transmission, the transmission
loop resumes and empties the queue by making federation requests.</p>
<p>If the backoff grows too large (&gt; 1 hour), the in-memory queue is emptied (to prevent
unbounded growth) and Catch-Up Mode is entered.</p>
<p>It is worth noting that the back-off for a remote server is cleared once an inbound
request from that remote server is received (see <code class="docutils literal notranslate"><span class="pre">notify_remote_server_up</span></code>).
At this point, the transaction transmission loop is also started up, to proactively
send missed PDUs and EDUs to the destination (i.e. you dont need to wait for a new PDU
or EDU, destined for that destination, to be created in order to send out missed PDUs and
EDUs).</p>
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