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Merge pull request #420 from piotr-gawron/string-virtual-file
Dynamically generated vcf content
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/** | ||
* AbstractFile is an abstract representation of a file. There are two implementation: | ||
* 1. RemoteFile - representation of a file on a remote server which can be | ||
* fetched in chunks, e.g. using a Range request. | ||
* 2. LocalStringFile is a representation of a file that was created from input string. | ||
* Used for testing and small input files. | ||
* @flow | ||
*/ | ||
'use strict'; | ||
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//import Q from 'q'; | ||
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class AbstractFile { | ||
constructor() { | ||
//how to prevent instantation of this class??? | ||
//this code doesn't pass npm run flow | ||
// if (new.target === AbstractFile) { | ||
// throw new TypeError("Cannot construct AbstractFile instances directly"); | ||
// } | ||
} | ||
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getBytes(start: number, length: number):Object {//: Q.Promise<ArrayBuffer> { | ||
throw new TypeError("Method getBytes is not implemented"); | ||
} | ||
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// Read the entire file -- not recommended for large files! | ||
getAll():Object {//: Q.Promise<ArrayBuffer> { | ||
throw new TypeError("Method getAll is not implemented"); | ||
} | ||
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// Reads the entire file as a string (not an ArrayBuffer). | ||
// This does not use the cache. | ||
getAllString():Object {//: Q.Promise<string> { | ||
throw new TypeError("Method getAllString is not implemented"); | ||
} | ||
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// Returns a promise for the number of bytes in the remote file. | ||
getSize():Object {//: Q.Promise<number> { | ||
throw new TypeError("Method getSize is not implemented"); | ||
} | ||
} | ||
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module.exports = AbstractFile; |
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Original file line number | Diff line number | Diff line change |
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/** | ||
* LocalStringFile is a representation of a file that was created from input string. Used for testing and small input files. | ||
* @flow | ||
*/ | ||
'use strict'; | ||
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import Q from 'q'; | ||
import AbstractFile from './AbstractFile'; | ||
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class LocalStringFile extends AbstractFile { | ||
fileLength: number; | ||
content: string; //content of this "File" | ||
buffer: ArrayBuffer; | ||
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constructor(content: string) { | ||
super(); | ||
this.fileLength = content.length; | ||
this.buffer = new ArrayBuffer(content.length); // 2 bytes for each char | ||
this.content = content; | ||
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var bufView = new Uint8Array(this.buffer); | ||
for (var i=0; i < this.fileLength; i++) { | ||
bufView[i] = content.charCodeAt(i); | ||
} | ||
} | ||
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getBytes(start: number, length: number): Q.Promise<ArrayBuffer> { | ||
if (length < 0) { | ||
return Q.reject(`Requested <0 bytes (${length})`); | ||
} | ||
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// If the remote file length is known, clamp the request to fit within it. | ||
var stop = start + length - 1; | ||
if (this.fileLength != -1) { | ||
stop = Math.min(this.fileLength - 1, stop); | ||
} | ||
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// First check the cache. | ||
var buf = this.getFromCache(start, stop); | ||
return Q.when(buf); | ||
} | ||
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// Read the entire file -- not recommended for large files! | ||
getAll(): Q.Promise<ArrayBuffer> { | ||
var buf = this.getFromCache(0, this.fileLength - 1); | ||
return Q.when(buf); | ||
} | ||
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// Reads the entire file as a string (not an ArrayBuffer). | ||
// This does not use the cache. | ||
getAllString(): Q.Promise<string> { | ||
return Q.when(this.content); | ||
} | ||
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// Returns a promise for the number of bytes in the remote file. | ||
getSize(): Q.Promise<number> { | ||
return Q.when(this.fileLength); | ||
} | ||
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getFromCache(start: number, stop: number): ?ArrayBuffer { | ||
return this.buffer.slice(start, stop + 1); | ||
} | ||
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} | ||
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module.exports = LocalStringFile; |
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Original file line number | Diff line number | Diff line change |
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/* @flow */ | ||
'use strict'; | ||
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import {expect} from 'chai'; | ||
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import LocalStringFile from '../main/LocalStringFile'; | ||
import jBinary from 'jbinary'; | ||
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describe('LocalStringFile', () => { | ||
function bufferToText(buf) { | ||
return new jBinary(buf).read('string'); | ||
} | ||
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it('should fetch a subset of a file', function() { | ||
var f = new LocalStringFile('0123456789\n'); | ||
var promisedData = f.getBytes(4, 5); | ||
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return promisedData.then(buf => { | ||
expect(buf.byteLength).to.equal(5); | ||
expect(bufferToText(buf)).to.equal('45678'); | ||
}); | ||
}); | ||
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it('should fetch subsets from cache', function() { | ||
var f = new LocalStringFile('0123456789\n'); | ||
return f.getBytes(0, 10).then(buf => { | ||
expect(buf.byteLength).to.equal(10); | ||
expect(bufferToText(buf)).to.equal('0123456789'); | ||
return f.getBytes(4, 5).then(buf => { | ||
expect(buf.byteLength).to.equal(5); | ||
expect(bufferToText(buf)).to.equal('45678'); | ||
}); | ||
}); | ||
}); | ||
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it('should fetch entire files', function() { | ||
var f = new LocalStringFile('0123456789\n'); | ||
return f.getAll().then(buf => { | ||
expect(buf.byteLength).to.equal(11); | ||
expect(bufferToText(buf)).to.equal('0123456789\n'); | ||
}); | ||
}); | ||
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it('should determine file lengths', function() { | ||
var f = new LocalStringFile('0123456789\n'); | ||
return f.getSize().then(size => { | ||
expect(size).to.equal(11); | ||
}); | ||
}); | ||
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it('should get file lengths from full requests', function() { | ||
var f = new LocalStringFile('0123456789\n'); | ||
return f.getAll().then(buf => { | ||
return f.getSize().then(size => { | ||
expect(size).to.equal(11); | ||
}); | ||
}); | ||
}); | ||
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it('should get file lengths from range requests', function() { | ||
var f = new LocalStringFile('0123456789\n'); | ||
return f.getBytes(4, 5).then(buf => { | ||
return f.getSize().then(size => { | ||
expect(size).to.equal(11); | ||
}); | ||
}); | ||
}); | ||
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it('should cache requests for full files', function() { | ||
var f = new LocalStringFile('0123456789\n'); | ||
f.getAll().then(buf => { | ||
expect(buf.byteLength).to.equal(11); | ||
expect(bufferToText(buf)).to.equal('0123456789\n'); | ||
return f.getAll().then(buf => { | ||
expect(buf.byteLength).to.equal(11); | ||
expect(bufferToText(buf)).to.equal('0123456789\n'); | ||
}); | ||
}); | ||
}); | ||
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it('should serve range requests from cache after getAll', function() { | ||
var f = new LocalStringFile('0123456789\n'); | ||
return f.getAll().then(buf => { | ||
expect(buf.byteLength).to.equal(11); | ||
expect(bufferToText(buf)).to.equal('0123456789\n'); | ||
return f.getBytes(4, 5).then(buf => { | ||
expect(buf.byteLength).to.equal(5); | ||
expect(bufferToText(buf)).to.equal('45678'); | ||
}); | ||
}); | ||
}); | ||
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it('should truncate requests past EOF', function() { | ||
var f = new LocalStringFile('0123456789\n'); | ||
var promisedData = f.getBytes(4, 100); | ||
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return promisedData.then(buf => { | ||
expect(buf.byteLength).to.equal(7); | ||
expect(bufferToText(buf)).to.equal('456789\n'); | ||
return f.getBytes(6, 90).then(buf => { | ||
expect(buf.byteLength).to.equal(5); | ||
expect(bufferToText(buf)).to.equal('6789\n'); | ||
}); | ||
}); | ||
}); | ||
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it('should fetch entire files as strings', function() { | ||
var f = new LocalStringFile('0123456789\n'); | ||
return f.getAllString().then(txt => { | ||
expect(txt).to.equal('0123456789\n'); | ||
}); | ||
}); | ||
}); |
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