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53 lines
2.1 KiB
CoffeeScript
53 lines
2.1 KiB
CoffeeScript
request = require("request").defaults(jar: false)
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fs = require("fs")
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logger = require "logger-sharelatex"
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module.exports = UrlFetcher =
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pipeUrlToFile: (url, filePath, _callback = (error) ->) ->
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callbackOnce = (error) ->
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cleanUp error, (error) ->
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_callback(error)
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_callback = () ->
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cleanUp = (error, callback) ->
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if error?
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logger.log filePath: filePath, "deleting file from cache due to error"
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fs.unlink filePath, (err) ->
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if err?
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logger.err err: err, filePath: filePath, "error deleting file from cache"
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callback(error)
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else
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callback()
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fileStream = fs.createWriteStream(filePath)
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fileStream.on 'error', (error) ->
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logger.error err: error, url:url, filePath: filePath, "error writing file into cache"
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callbackOnce(error)
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logger.log url:url, filePath: filePath, "downloading url to cache"
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urlStream = request.get(url)
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urlStream.on "response", (res) ->
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if res.statusCode >= 200 and res.statusCode < 300
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urlStream.pipe(fileStream)
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else
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logger.error statusCode: res.statusCode, url:url, filePath: filePath, "unexpected status code downloading url to cache"
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# https://nodejs.org/api/http.html#http_class_http_clientrequest
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# If you add a 'response' event handler, then you must consume
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# the data from the response object, either by calling
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# response.read() whenever there is a 'readable' event, or by
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# adding a 'data' handler, or by calling the .resume()
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# method. Until the data is consumed, the 'end' event will not
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# fire. Also, until the data is read it will consume memory
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# that can eventually lead to a 'process out of memory' error.
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urlStream.on 'data', () -> # discard the data
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callbackOnce(new Error("URL returned non-success status code: #{res.statusCode} #{url}"))
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urlStream.on "error", (error) ->
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logger.error err: error, url:url, filePath: filePath, "error downloading url"
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callbackOnce(error or new Error("Something went wrong downloading the URL #{url}"))
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urlStream.on "end", () ->
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# FIXME: what if we get an error writing the file? Maybe we
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# should be using the fileStream end event as the point of
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# callback.
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callbackOnce()
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