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process: initial SourceMap support via NODE_V8_COVERAGE
PR-URL: #28960 Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: David Carlier <devnexen@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,152 @@ | ||
| 'use strict'; | ||
|
|
||
| // See https://sourcemaps.info/spec.html for SourceMap V3 specification. | ||
| const { Buffer } = require('buffer'); | ||
| const debug = require('internal/util/debuglog').debuglog('source_map'); | ||
| const { dirname, resolve } = require('path'); | ||
| const fs = require('fs'); | ||
| const { | ||
| normalizeReferrerURL, | ||
| } = require('internal/modules/cjs/helpers'); | ||
| const { JSON, Object } = primordials; | ||
| // For cjs, since Module._cache is exposed to users, we use a WeakMap | ||
| // keyed on module, facilitating garbage collection. | ||
| const cjsSourceMapCache = new WeakMap(); | ||
| // The esm cache is not exposed to users, so we can use a Map keyed | ||
| // on filenames. | ||
| const esmSourceMapCache = new Map(); | ||
| const { fileURLToPath, URL } = require('url'); | ||
|
|
||
| function maybeCacheSourceMap(filename, content, cjsModuleInstance) { | ||
| if (!process.env.NODE_V8_COVERAGE) return; | ||
|
|
||
| let basePath; | ||
| try { | ||
| filename = normalizeReferrerURL(filename); | ||
| basePath = dirname(fileURLToPath(filename)); | ||
| } catch (err) { | ||
| // This is most likely an [eval]-wrapper, which is currently not | ||
| // supported. | ||
| debug(err.stack); | ||
| return; | ||
| } | ||
|
|
||
| const match = content.match(/\/[*/]#\s+sourceMappingURL=(?<sourceMappingURL>[^\s]+)/); | ||
| if (match) { | ||
| if (cjsModuleInstance) { | ||
| cjsSourceMapCache.set(cjsModuleInstance, { | ||
| url: match.groups.sourceMappingURL, | ||
| data: dataFromUrl(basePath, match.groups.sourceMappingURL) | ||
| }); | ||
| } else { | ||
| // If there is no cjsModuleInstance assume we are in a | ||
| // "modules/esm" context. | ||
| esmSourceMapCache.set(filename, { | ||
| url: match.groups.sourceMappingURL, | ||
| data: dataFromUrl(basePath, match.groups.sourceMappingURL) | ||
| }); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| function dataFromUrl(basePath, sourceMappingURL) { | ||
| try { | ||
| const url = new URL(sourceMappingURL); | ||
| switch (url.protocol) { | ||
| case 'data:': | ||
| return sourceMapFromDataUrl(basePath, url.pathname); | ||
| default: | ||
| debug(`unknown protocol ${url.protocol}`); | ||
| return null; | ||
| } | ||
| } catch (err) { | ||
| debug(err.stack); | ||
| // If no scheme is present, we assume we are dealing with a file path. | ||
| const sourceMapFile = resolve(basePath, sourceMappingURL); | ||
| return sourceMapFromFile(sourceMapFile); | ||
| } | ||
| } | ||
|
|
||
| function sourceMapFromFile(sourceMapFile) { | ||
| try { | ||
| const content = fs.readFileSync(sourceMapFile, 'utf8'); | ||
| const data = JSON.parse(content); | ||
| return sourcesToAbsolute(dirname(sourceMapFile), data); | ||
| } catch (err) { | ||
| debug(err.stack); | ||
| return null; | ||
| } | ||
| } | ||
|
|
||
| // data:[<mediatype>][;base64],<data> see: | ||
| // https://tools.ietf.org/html/rfc2397#section-2 | ||
| function sourceMapFromDataUrl(basePath, url) { | ||
| const [format, data] = url.split(','); | ||
| const splitFormat = format.split(';'); | ||
| const contentType = splitFormat[0]; | ||
| const base64 = splitFormat[splitFormat.length - 1] === 'base64'; | ||
| if (contentType === 'application/json') { | ||
| const decodedData = base64 ? | ||
| Buffer.from(data, 'base64').toString('utf8') : data; | ||
| try { | ||
| const parsedData = JSON.parse(decodedData); | ||
| return sourcesToAbsolute(basePath, parsedData); | ||
| } catch (err) { | ||
| debug(err.stack); | ||
| return null; | ||
| } | ||
| } else { | ||
| debug(`unknown content-type ${contentType}`); | ||
| return null; | ||
| } | ||
| } | ||
|
|
||
| // If the sources are not absolute URLs after prepending of the "sourceRoot", | ||
| // the sources are resolved relative to the SourceMap (like resolving script | ||
| // src in a html document). | ||
| function sourcesToAbsolute(base, data) { | ||
| data.sources = data.sources.map((source) => { | ||
| source = (data.sourceRoot || '') + source; | ||
| if (!/^[\\/]/.test(source[0])) { | ||
| source = resolve(base, source); | ||
| } | ||
| if (!source.startsWith('file://')) source = `file://${source}`; | ||
| return source; | ||
| }); | ||
| // The sources array is now resolved to absolute URLs, sourceRoot should | ||
| // be updated to noop. | ||
| data.sourceRoot = ''; | ||
| return data; | ||
| } | ||
|
|
||
| function sourceMapCacheToObject() { | ||
| const obj = Object.create(null); | ||
|
|
||
| for (const [k, v] of esmSourceMapCache) { | ||
| obj[k] = v; | ||
| } | ||
| appendCJSCache(obj); | ||
|
|
||
| if (Object.keys(obj).length === 0) { | ||
| return undefined; | ||
| } else { | ||
| return obj; | ||
| } | ||
| } | ||
|
|
||
| // Since WeakMap can't be iterated over, we use Module._cache's | ||
| // keys to facilitate Source Map serialization. | ||
| function appendCJSCache(obj) { | ||
| const { Module } = require('internal/modules/cjs/loader'); | ||
| Object.keys(Module._cache).forEach((key) => { | ||
| const value = cjsSourceMapCache.get(Module._cache[key]); | ||
| if (value) { | ||
| obj[`file://${key}`] = value; | ||
| } | ||
| }); | ||
| } | ||
|
|
||
| module.exports = { | ||
| sourceMapCacheToObject, | ||
| maybeCacheSourceMap | ||
| }; |
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