callback to handle completion of pipe

Question

I am using the following node js code to download documents from some url and save it in the disk  I want to be informed about when the document is downloaded  i have not seen any callback with pipe Or  Is there any  end  event that can be captured on completion of download    request some url doc  pipe fs createWriteStream  xyz doc

User · Answer

Here s a solution that handles errors in requests and calls a callback after the file is written   request opts       on  error   function err   return callback err         pipe fs createWriteStream filename        on  finish   function  err            return callback err

User · Answer

Code snippet for piping content from web via http s  to filesystem  As   starbeamrainbowlabs noticed event finish does job  var tmpFile     tmp somefilename doc    var ws   fs createWriteStream tmpFile   ws on  finish   function          pipe done here  do something with file      var client   url slice 0  5       https    https   http  client get url  function response      return response pipe ws

User · Answer

Streams are EventEmitters so you can listen to certain events  As you said there is a finish event for request  previously end     var stream   request      pipe        stream on  finish   function                For more information about which events are available you can check the stream documentation page

User · Answer

Based nodejs document  http   nodejs org api stream html stream event finish  it should handle writableStream s finish event   var writable   getWriteable    var readable   getReadable    readable pipe writable   writable on  finish   function

User · Answer

I found an a bit different solution of my problem regarding this context  Thought worth sharing   Most of the example create readStreams from file  But in my case readStream has to be created from JSON string coming from a message pool    var jsonStream   through2 obj function chunk  encoding  callback                        this push JSON stringify chunk  null  4      n                        callback                           message value -- gt  value text to write in write txt  jsonStream write JSON parse message value    var writeStream   sftp createWriteStream   path to write write txt        close  event didn t work for me  writeStream on   close   function          console log   - done          sftp end                 finish  event didn t work for me either  writeStream on   close   function          console log   - done           sftp end                     finally this worked for me  jsonStream on  data   function data        var toString   Object prototype toString call data       console log  type of data    toString       console log   - file transferred          jsonStream pipe  writeStream

[node.js] callback to handle completion of pipe

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