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RESTFileTransfer

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Example of how to transfer files using RESTful services

What's new in this version

Initial Release

RESTFileTransfer

Example of how to transfer files using RESTful services
The motivation and the explanations are available in these articles in Developer Commnunity:
Transferring Files via REST to Store in a Property, Part 1
Transferring Files via REST to Store in a Property, Part 2

Prerequisites

Make sure you have git and Docker desktop installed.

Installation

Clone/git pull the repo into any local directory

$ git clone https://github.com/intersystems-community/objectscript-docker-template.git

Open the terminal in this directory and build and run the IRIS container with your project:

$ docker-compose up  -d --build

How to Test it

From POSTMAN or ARC client send a POST request with your file as BODY

Use SMP > System-Explorer > Globals
or IRIS terminal to examine globals:

$ docker-compose exec iris iris session iris
USER>zwrite ^RestTransfer.FileDescD
^RestTransfer.FileDescD=5
^RestTransfer.FileDescD(1)=$lb("","1","")
^RestTransfer.FileDescD(2)=$lb("","2","")
^RestTransfer.FileDescD(3)=$lb("","3","")
^RestTransfer.FileDescD(4)=$lb("","4","Writer.cls")
^RestTransfer.FileDescD(5)=$lb("","5","dev.md")
USER> 
USER>zwrite ^RestTransfer.FileDescS(4)
^RestTransfer.FileDescS(4)=1
^RestTransfer.FileDescS(4,0)=1219
^RestTransfer.FileDescS(4,1)="Class RestTransfer.ChunkedWriter Extends %Net.ChunkedWriter"_$c(10)_"{"_$c(10,10)_"Parameter MAXSIZEOFCHUNK = 10000;"_$c(10,10)_"Property Filename As %String;"_$c(10,10)_"/// Abstract method to be overridden by subclass to do the chunked output using the "_$c(10)_"/// utility functions defined by this abstract super class."_$c(10)_"Method OutputStream()"_$c(10)_"{"_$c(10,9)_"set ..TranslateTable = ""RAW"""_$c(10,9)_"set cTime = $zdatetime($Now(), 8, 1) "_$c(10,9,9,9,10,9)_"set fStream = ##class(%Stream.FileBinary).%New()"_$c(10,9)_"set fStream.Filename = ..Filename"_$c(10,9)_"set size = fStream.Size"_$c(9,9,10,9)_"if size < ..#MAXSIZEOFCHUNK {"_$c(9,10,9,9)_"set buf = fStream.Read(.size, .st)"_$c(10,9,9)_"if $$$ISERR(st)"_$c(10,9,9)_"{"_$c(10,9,9,9)_"THROW st"_$c(10,9,9)_"} else {"_$c(10,9,9,9)_"set ^log(cTime, ..Filename) = size"_$c(10,9,9,9)_"do ..WriteSingleChunk(buf)"_$c(10,9,9)_"}"_$c(10,9)_"} else {"_$c(10,9,9)_"set ^log(cTime, ..Filename, 0) = size"_$c(10,9,9)_"set len = ..#MAXSIZEOFCHUNK"_$c(10,9,9)_"set buf = fStream.Read(.len, .st)"_$c(10,9,9)_"if $$$ISERR(st)"_$c(10,9,9)_"{"_$c(10,9,9,9)_"THROW st"_$c(10,9,9)_"} else {"_$c(10,9,9,9)_"set ^log(cTime, ..Filename, 1) = len"_$c(10,9,9,9)_"do ..WriteFirstChunk(buf)"_$c(10,9,9)_"}"_$c(9,9,10,9,9)_"set i = 2"_$c(10,9,9)_"While 'fStream.AtEnd {"_$c(9,10)_"    "_$c(9,9)_"set len = ..#MAXSIZEOFCHUNK"_$c(10,9)_" "_$c(9,9)_"set temp = fStream.Read(.len, .sc)"_$c(10,9)_" "_$c(9,9)_"if len<..#MAXSIZEOFCHUNK "_$c(10,9)_" "_$c(9,9)_"{"_$c(10,9,9)_" "_$c(9,9)_"do ..WriteLastChunk(temp)"_$c(10,9,9)_" "_$c(9,9,10,9)_" "_$c(9,9)_"} else {"_$c(10,9,9)_" "_$c(9,9)_"do ..WriteChunk(temp)"_$c(10,9,9)_" "_$c(9)_"}"_$c(10,9,9)_" "_$c(9)_"set ^log(cTime, ..Filename, i) = len"_$c(10,9,9)_" "_$c(9)_"set i = $increment(i)"_$c(10)_"  "_$c(9,9)_"}"_$c(9,9,9,10,9)_"}"_$c(10)_"}"_$c(10,10)_"}"_$c(10)

Follow the guidelines as described here

Made with
Version
1.0.004 Jan, 2021
Category
Technology Example
Works with
InterSystems IRIS
First published
04 Jan, 2021
Last checked by moderator
27 Jun, 2023Works