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Merge pull request #335 from Rugvip/readfilecontext
Add support for Node.js v16.3.0+
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Original file line number | Diff line number | Diff line change |
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'use strict'; | ||
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const {AbortError} = require('./error'); | ||
const {FSReqCallback} = process.binding('fs'); | ||
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/** | ||
* This is a workaround for getting access to the ReadFileContext | ||
* prototype, which we need to be able to patch its methods. | ||
* @returns {object} | ||
*/ | ||
exports.getReadFileContextPrototype = function() { | ||
const fs = require('fs'); | ||
const fsBinding = process.binding('fs'); | ||
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const originalOpen = fsBinding.open; | ||
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let proto; | ||
fsBinding.open = (_path, _flags, _mode, req) => { | ||
proto = Object.getPrototypeOf(req.context); | ||
}; | ||
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fs.readFile('/ignored.txt', () => {}); | ||
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fsBinding.open = originalOpen; | ||
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return proto; | ||
}; | ||
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/** | ||
* This patches the ReadFileContext prototype to use mocked bindings | ||
* when available. This entire implementation is more or less fully | ||
* copied over from Node.js's /lib/internal/fs/read_file_context.js | ||
* | ||
* This patch is required to support Node.js v16+, where the ReadFileContext | ||
* closes directly over the internal fs bindings, and is also eagerly loader. | ||
* | ||
* See https://github.com/tschaub/mock-fs/issues/332 for more information. | ||
* | ||
* @param {object} prototype The ReadFileContext prototype object to patch. | ||
*/ | ||
exports.patchReadFileContext = function(prototype) { | ||
const origRead = prototype.read; | ||
const origClose = prototype.close; | ||
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const kReadFileUnknownBufferLength = 64 * 1024; | ||
const kReadFileBufferLength = 512 * 1024; | ||
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function readFileAfterRead(err, bytesRead) { | ||
const context = this.context; | ||
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if (err) { | ||
return context.close(err); | ||
} | ||
context.pos += bytesRead; | ||
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if (context.pos === context.size || bytesRead === 0) { | ||
context.close(); | ||
} else { | ||
if (context.size === 0) { | ||
// Unknown size, just read until we don't get bytes. | ||
const buffer = | ||
bytesRead === kReadFileUnknownBufferLength | ||
? context.buffer | ||
: context.buffer.slice(0, bytesRead); | ||
context.buffers.push(buffer); | ||
} | ||
context.read(); | ||
} | ||
} | ||
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function readFileAfterClose(err) { | ||
const context = this.context; | ||
const callback = context.callback; | ||
let buffer = null; | ||
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if (context.err || err) { | ||
// This is a simplification from Node.js, where we don't bother merging the errors | ||
return callback(context.err || err); | ||
} | ||
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try { | ||
if (context.size === 0) { | ||
buffer = Buffer.concat(context.buffers, context.pos); | ||
} else if (context.pos < context.size) { | ||
buffer = context.buffer.slice(0, context.pos); | ||
} else { | ||
buffer = context.buffer; | ||
} | ||
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if (context.encoding) { | ||
buffer = buffer.toString(context.encoding); | ||
} | ||
} catch (err) { | ||
return callback(err); | ||
} | ||
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callback(null, buffer); | ||
} | ||
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prototype.read = function read() { | ||
if (!prototype._mockedBinding) { | ||
return origRead.apply(this, arguments); | ||
} | ||
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let buffer; | ||
let offset; | ||
let length; | ||
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if (this.signal && this.signal.aborted) { | ||
return this.close(new AbortError()); | ||
} | ||
if (this.size === 0) { | ||
buffer = Buffer.allocUnsafeSlow(kReadFileUnknownBufferLength); | ||
offset = 0; | ||
length = kReadFileUnknownBufferLength; | ||
this.buffer = buffer; | ||
} else { | ||
buffer = this.buffer; | ||
offset = this.pos; | ||
length = Math.min(kReadFileBufferLength, this.size - this.pos); | ||
} | ||
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const req = new FSReqCallback(); | ||
req.oncomplete = readFileAfterRead; | ||
req.context = this; | ||
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// This call and the one in close() is what we want to change, the | ||
// rest is pretty much the same as Node.js except we don't have access | ||
// to some of the internal optimizations. | ||
prototype._mockedBinding.read(this.fd, buffer, offset, length, -1, req); | ||
}; | ||
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prototype.close = function close(err) { | ||
if (!prototype._mockedBinding) { | ||
return origClose.apply(this, arguments); | ||
} | ||
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if (this.isUserFd) { | ||
process.nextTick(function tick(context) { | ||
readFileAfterClose.apply({context}, [null]); | ||
}, this); | ||
return; | ||
} | ||
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const req = new FSReqCallback(); | ||
req.oncomplete = readFileAfterClose; | ||
req.context = this; | ||
this.err = err; | ||
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prototype._mockedBinding.close(this.fd, req); | ||
}; | ||
}; |
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