examples/curl_http.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Copyright 2013 Matthieu Lucas <lucasmatthieu@gmail.com>
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at
   8 #
   9 #     http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 # Sample of the Curl module.
  18 module curl_http
  19
  20 import curl
  21
  22 # Small class to represent an Http Fetcher
  23 class MyHttpFetcher
  24   super CurlCallbacks
  25
  26   var curl: Curl
  27
  28   init do self.curl = new Curl
  29
  30   # Release curl object
  31   fun destroy do self.curl.destroy
  32
  33   fun request(url: String): nullable CurlRequest do return self.curl.http_request(url)
  34
  35   # Header callback
  36   redef fun header_callback(line: String) do print "Header_callback : {line}"
  37
  38   # Body callback
  39   redef fun body_callback(line: String) do print "Body_callback : {line}"
  40
  41   # Stream callback - Cf : No one is registered
  42   redef fun stream_callback(buffer: String, size: Int, count: Int) do print "Stream_callback : {buffer} - {size} - {count}"
  43 end
  44
  45
  46 # Program
  47 if args.length < 2 then
  48   print "Usage {sys.program_name} <method wished [POST, GET, GET_FILE]> <target url>"
  49 else
  50
  51   var myHttpFetcher = new MyHttpFetcher
  52   var url = args[1]
  53
  54   # HTTP Get Request
  55   if args[0] == "GET" then
  56     var getContentRequest = myHttpFetcher.request(url)
  57     if getContentRequest isa CurlHTTPRequest then
  58
  59       getContentRequest.verbose = false
  60       var getResponse = getContentRequest.execute
  61
  62       if getResponse isa CurlResponseSuccess then
  63         print "Status code : {getResponse.status_code}"
  64         print "Body : {getResponse.body_str}"
  65       else if getResponse isa CurlResponseFailed then
  66         print "Error code : {getResponse.error_code}"
  67         print "Error msg : {getResponse.error_msg}"
  68       end
  69
  70     else
  71       print "Wrong init with Curl HTTP request"
  72     end
  73
  74   # HTTP Post Request
  75   else if args[0] == "POST" then
  76     var postContentRequest = myHttpFetcher.request(url)
  77     if postContentRequest isa CurlHTTPRequest then
  78
  79       postContentRequest.delegate = myHttpFetcher
  80       var postDatas = new HeaderMap
  81       postDatas["Bugs Bunny"] = "Daffy Duck"
  82       postDatas["Batman"] = "Robin likes special characters @#ùà!è§'(\"é&://,;<>∞~*"
  83       postDatas["Batman"] = "Yes you can set multiple identical keys, but APACHE will consider only once, the last one"
  84       postContentRequest.datas = postDatas
  85       postContentRequest.verbose = false
  86       var postResponse = postContentRequest.execute
  87
  88       if postResponse isa CurlResponseSuccess then
  89         print "*** Answer ***"
  90         print "Status code : {postResponse.status_code}"
  91         print "Body should be empty, because we decided to manage callbacks : {postResponse.body_str.length}"
  92       else if postResponse isa CurlResponseFailed then
  93         print "Error code : {postResponse.error_code}"
  94         print "Error msg : {postResponse.error_msg}"
  95       end
  96
  97     else
  98       print "Wrong init with Curl HTTP request"
  99     end
 100
 101   # HTTP Get to file Request
 102   else if args[0] == "GET_FILE" then
 103     var downloadFileRequest = myHttpFetcher.request(url)
 104     if downloadFileRequest isa CurlHTTPRequest then
 105
 106       var headers = new HeaderMap
 107       headers["Accept"] = "Moo"
 108       downloadFileRequest.headers = headers
 109       downloadFileRequest.verbose = true
 110       var downloadResponse = downloadFileRequest.download_to_file(null)
 111
 112       if downloadResponse isa CurlFileResponseSuccess then
 113         print "*** Answer ***"
 114         print "Status code : {downloadResponse.status_code}"
 115         print "Size downloaded : {downloadResponse.size_download}"
 116       else if downloadResponse isa CurlResponseFailed then
 117         print "Error code : {downloadResponse.error_code}"
 118         print "Error msg : {downloadResponse.error_msg}"
 119       end
 120
 121     else
 122       print "Wrong init with Curl HTTP request"
 123     end
 124
 125   # Program logic
 126   else
 127     print "Usage : Method[POST, GET, GET_FILE]"
 128   end
 129 end