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---
title: Emacs から HTTP リクエストを送信する
author: kazu634
date: 2009-11-29
url: /2009/11/29/_1406/
wordtwit_post_info:
- 'O:8:"stdClass":13:{s:6:"manual";b:0;s:11:"tweet_times";i:1;s:5:"delay";i:0;s:7:"enabled";i:1;s:10:"separation";s:2:"60";s:7:"version";s:3:"3.7";s:14:"tweet_template";b:0;s:6:"status";i:2;s:6:"result";a:0:{}s:13:"tweet_counter";i:2;s:13:"tweet_log_ids";a:1:{i:0;i:4957;}s:9:"hash_tags";a:0:{}s:8:"accounts";a:1:{i:0;s:7:"kazu634";}}'
categories:
- Emacs
---
<div class="section">
<p>
<a href="http://d.hatena.ne.jp/hayamiz/" onclick="__gaTracker('send', 'event', 'outbound-article', 'http://d.hatena.ne.jp/hayamiz/', 'id:hayamiz');">id:hayamiz</a> さんの twittering-mode のソースをのぞいていると、 Emacs だけで HTTP リクエストを送信していることを発見した。 Web 経由の API って、基本的には 　HTTP の get か post リクエストなんだから、 Emacs から Web API を利用することが出来るのではないかと考えてみた。
</p>
<p>
というわけで、 Google Mapジオコーディング API を使用してみようと考えてみました…でも、まだ途中です。とりあえず xml でレスポンスを入手するところまで出来ました。基本的には <a href="http://d.hatena.ne.jp/hayamiz/" onclick="__gaTracker('send', 'event', 'outbound-article', 'http://d.hatena.ne.jp/hayamiz/', 'id:hayamiz');">id:hayamiz</a> さんのソースを<strike>ぱくり</strike>参考にさせていただいております。
</p>
<h4>
ソース
</h4>
<p>
「*test-buffer*」というバッファーに HTTP レスポンスを表示させ、そこからごちゃごちゃと処理する流れになっています。
</p>
<pre class="syntax-highlight">
<span class="synSpecial">(</span><span class="synStatement">require</span> <span class="synSpecial">'</span><span class="synIdentifier">xml</span><span class="synSpecial">)</span>
<span class="synComment">;; バッファーが存在しなければ、バッファーを作成する</span>
<span class="synSpecial">(</span><span class="synStatement">defun</span> GMap-get-or-generate-buffer <span class="synSpecial">(</span>buffer<span class="synSpecial">)</span>
<span class="synSpecial">(</span><span class="synStatement">if</span> <span class="synSpecial">(</span>bufferp buffer<span class="synSpecial">)</span>
<span class="synSpecial">(</span><span class="synStatement">if</span> <span class="synSpecial">(</span>buffer-live-p buffer<span class="synSpecial">)</span>
buffer
<span class="synSpecial">(</span>generate-new-buffer <span class="synSpecial">(</span>buffer-name buffer<span class="synSpecial">)))</span>
<span class="synSpecial">(</span><span class="synStatement">if</span> <span class="synSpecial">(</span><span class="synStatement">stringp</span> buffer<span class="synSpecial">)</span>
<span class="synSpecial">(</span><span class="synStatement">or</span> <span class="synSpecial">(</span>get-buffer buffer<span class="synSpecial">)</span>
<span class="synSpecial">(</span>generate-new-buffer buffer<span class="synSpecial">)))))</span>
<span class="synComment">;; HTTP GETリクエストを送信する</span>
<span class="synSpecial">(</span><span class="synStatement">defun</span> GMap-http-get <span class="synSpecial">(</span>address<span class="synSpecial">)</span>
<span class="synConstant">&#34;A method for sending http GET request to maps.google.com&#34;</span>
<span class="synSpecial">(</span>GMap-get-or-generate-buffer <span class="synConstant">&#34;*test-buffer*&#34;</span><span class="synSpecial">)</span>
<span class="synSpecial">(</span>save-excursion
<span class="synSpecial">(</span>set-buffer <span class="synConstant">&#34;*test-buffer*&#34;</span><span class="synSpecial">)</span>
<span class="synSpecial">(</span>erase-buffer<span class="synSpecial">))</span>
<span class="synSpecial">(</span><span class="synStatement">let</span>
<span class="synSpecial">((</span>proc <span class="synStatement">nil</span><span class="synSpecial">)</span>
<span class="synSpecial">(</span>query <span class="synSpecial">(</span>url-hexify-string address<span class="synSpecial">)))</span>
<span class="synSpecial">(</span>condition-case <span class="synStatement">nil</span>
<span class="synSpecial">(</span><span class="synStatement">progn</span>
<span class="synSpecial">(</span><span class="synStatement">setq</span> proc
<span class="synSpecial">(</span>open-network-stream
<span class="synConstant">&#34;GMap-connection-process&#34;</span> <span class="synConstant">&#34;*test-buffer*&#34;</span>
<span class="synConstant">&#34;maps.google.com&#34;</span> <span class="synConstant">80</span><span class="synSpecial">))</span>
<span class="synSpecial">(</span>set-process-sentinel proc <span class="synSpecial">'</span><span class="synIdentifier">test-sentinel</span><span class="synSpecial">)</span>
<span class="synSpecial">(</span>process-send-string
proc
<span class="synSpecial">(</span><span class="synStatement">let</span> <span class="synSpecial">((</span>nl <span class="synConstant">&#34;\r\n&#34;</span><span class="synSpecial">))</span>
<span class="synSpecial">(</span>concat <span class="synConstant">&#34;GET /maps/geo?output=xml&#38;hl=ja&#38;q=&#34;</span>
query
<span class="synConstant">&#34;&#38;ie=UTF8&#38;oe=UTF8 HTTP/1.1&#34;</span> nl
<span class="synConstant">&#34;Host: maps.google.com&#34;</span> nl
<span class="synConstant">&#34;Keep-Alive: 10&#34;</span> nl
<span class="synConstant">&#34;Accept: text/xml&#34;</span>
<span class="synConstant">&#34;,application/xhtml+xml&#34;</span>
<span class="synConstant">&#34;,application/html;q=0.9&#34;</span>
<span class="synConstant">&#34;,text/plain;q=0.8&#34;</span> nl
<span class="synConstant">&#34;Accept-Charset: utf-8;q=0.7,*;q=0.7&#34;</span> nl
<span class="synConstant">&#34;Connection: close&#34;</span>
nl nl<span class="synSpecial">))))</span>
<span class="synSpecial">(</span><span class="synStatement">error</span>
<span class="synSpecial">(</span>message <span class="synConstant">&#34;Failure: HTTP GET&#34;</span><span class="synSpecial">)</span> <span class="synStatement">nil</span><span class="synSpecial">))))</span>
<span class="synComment">;; HTTP レスポンスからヘッダーの部分を抽出する</span>
<span class="synSpecial">(</span><span class="synStatement">defun</span> GMap-extract-http-response-header <span class="synSpecial">(</span>&#38;optional buffer<span class="synSpecial">)</span>
<span class="synConstant">&#34;A method for extracting http response. You need to give the buffer name as the argument.&#34;</span>
<span class="synSpecial">(</span>save-excursion
<span class="synSpecial">(</span>set-buffer <span class="synConstant">&#34;*test-buffer*&#34;</span><span class="synSpecial">)</span>
<span class="synSpecial">(</span><span class="synStatement">let</span> <span class="synSpecial">((</span>content <span class="synSpecial">(</span>buffer-string<span class="synSpecial">)))</span>
<span class="synSpecial">(</span>substring content <span class="synConstant"></span> <span class="synSpecial">(</span>string-match <span class="synConstant">&#34;\r?\n\r?\n&#34;</span> content<span class="synSpecial">)))))</span>
<span class="synComment">;; HTTP レスポンスからボディーの部分(XML)を抽出する</span>
<span class="synSpecial">(</span><span class="synStatement">defun</span> GMap-extract-http-response-body <span class="synSpecial">(</span>&#38;optional buffer<span class="synSpecial">)</span>
<span class="synConstant">&#34;A method for extracting http response body from HTTP response.&#34;</span>
<span class="synSpecial">(</span><span class="synStatement">if</span> <span class="synSpecial">(</span><span class="synStatement">stringp</span> buffer<span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">setq</span> buffer <span class="synSpecial">(</span>get-buffer buffer<span class="synSpecial">)))</span>
<span class="synSpecial">(</span><span class="synStatement">if</span> <span class="synSpecial">(</span><span class="synStatement">null</span> buffer<span class="synSpecial">)</span> <span class="synSpecial">(</span><span class="synStatement">setq</span> buffer <span class="synConstant">&#34;*test-buffer*&#34;</span><span class="synSpecial">))</span>
<span class="synSpecial">(</span>save-excursion
<span class="synSpecial">(</span>set-buffer buffer<span class="synSpecial">)</span>
<span class="synSpecial">(</span><span class="synStatement">let</span> <span class="synSpecial">((</span>content <span class="synSpecial">(</span>buffer-string<span class="synSpecial">)))</span>
<span class="synSpecial">(</span>xml-parse-region <span class="synSpecial">(</span><span class="synStatement">+</span> <span class="synSpecial">(</span>string-match <span class="synConstant">&#34;\r?\n\r?\n&#34;</span> content<span class="synSpecial">)</span>
<span class="synSpecial">(</span><span class="synStatement">length</span> <span class="synSpecial">(</span>match-string <span class="synConstant"></span> content<span class="synSpecial">)))</span>
<span class="synSpecial">(</span>point-max<span class="synSpecial">)))))</span>
<span class="synComment">;; GET リクエストを送信して、レスポンスが返ってきたら実行される関数</span>
<span class="synSpecial">(</span><span class="synStatement">defun</span> test-sentinel <span class="synSpecial">(</span>proc state<span class="synSpecial">)</span>
<span class="synSpecial">(</span><span class="synStatement">let</span> <span class="synSpecial">((</span>header <span class="synSpecial">(</span>GMap-extract-http-response-header<span class="synSpecial">))</span>
<span class="synSpecial">(</span>status <span class="synStatement">nil</span><span class="synSpecial">))</span>
<span class="synSpecial">(</span><span class="synStatement">if</span> <span class="synSpecial">(</span>string-match <span class="synConstant">&#34;HTTP/1\.[01] \\([A-Z0-9 ]+\\)\r?\n&#34;</span> header<span class="synSpecial">)</span>
<span class="synSpecial">(</span><span class="synStatement">progn</span>
<span class="synSpecial">(</span><span class="synStatement">setq</span> status <span class="synSpecial">(</span>match-string-no-properties <span class="synConstant">1</span> header<span class="synSpecial">))</span>
<span class="synSpecial">(</span>case-string
status
<span class="synSpecial">((</span><span class="synConstant">&#34;200 OK&#34;</span><span class="synSpecial">)</span>
<span class="synSpecial">(</span>message <span class="synConstant">&#34;Success: Get.&#34;</span><span class="synSpecial">))</span>
<span class="synSpecial">(</span><span class="synStatement">t</span> <span class="synSpecial">(</span>message status<span class="synSpecial">))))</span>
<span class="synSpecial">(</span>message <span class="synConstant">&#34;Failure: Bad HTTP response.&#34;</span><span class="synSpecial">))))</span>
</pre>
<p>
</p>
<h4>
実行例
</h4>
<p>
下記のコマンドを実行してみてください。とりあえずレスポンスは取得できています。後はこれをどうつかうかだな:
</p>
<pre class="syntax-highlight">
<span class="synSpecial">(</span>GMap-http-get <span class="synConstant">&#34;横浜&#34;</span><span class="synSpecial">)</span>
<span class="synSpecial">(</span>GMap-extract-http-response-header<span class="synSpecial">)</span>
<span class="synSpecial">(</span>GMap-extract-http-response-body<span class="synSpecial">)</span>
</pre>
<h4>
参考
</h4>
<ul>
<li>
<a href="http://www.asahi-net.or.jp/~pw9s-szk/emacs/elisp_net.html" onclick="__gaTracker('send', 'event', 'outbound-article', 'http://www.asahi-net.or.jp/~pw9s-szk/emacs/elisp_net.html', 'elisp でのネットワークプログラム');" target="_blank">elisp でのネットワークプログラム</a>
</li>
</ul>
<div class="hatena-asin-detail">
<a href="http://www.amazon.co.jp/dp/4906391702/?tag=hatena_st1-22&ascsubtag=d-7ibv" onclick="__gaTracker('send', 'event', 'outbound-article', 'http://www.amazon.co.jp/dp/4906391702/?tag=hatena_st1-22&ascsubtag=d-7ibv', '');"><img src="https://images-na.ssl-images-amazon.com/images/I/51C4N4SHT7L._SL160_.jpg" class="hatena-asin-detail-image" alt="やさしいEmacs‐Lisp講座" title="やさしいEmacs‐Lisp講座" /></a></p>
<div class="hatena-asin-detail-info">
<p class="hatena-asin-detail-title">
<a href="http://www.amazon.co.jp/dp/4906391702/?tag=hatena_st1-22&ascsubtag=d-7ibv" onclick="__gaTracker('send', 'event', 'outbound-article', 'http://www.amazon.co.jp/dp/4906391702/?tag=hatena_st1-22&ascsubtag=d-7ibv', 'やさしいEmacs‐Lisp講座');">やさしいEmacs‐Lisp講座</a>
</p>
<ul>
<li>
<span class="hatena-asin-detail-label">作者:</span> <a href="http://d.hatena.ne.jp/keyword/%B9%AD%C0%A5%CD%BA%C6%F3" onclick="__gaTracker('send', 'event', 'outbound-article', 'http://d.hatena.ne.jp/keyword/%B9%AD%C0%A5%CD%BA%C6%F3', '広瀬雄二');" class="keyword">広瀬雄二</a>
</li>
<li>
<span class="hatena-asin-detail-label">出版社/メーカー:</span> <a href="http://d.hatena.ne.jp/keyword/%A5%AB%A5%C3%A5%C8%A5%B7%A5%B9%A5%C6%A5%E0" onclick="__gaTracker('send', 'event', 'outbound-article', 'http://d.hatena.ne.jp/keyword/%A5%AB%A5%C3%A5%C8%A5%B7%A5%B9%A5%C6%A5%E0', 'カットシステム');" class="keyword">カットシステム</a>
</li>
<li>
<span class="hatena-asin-detail-label">発売日:</span> 1999/01
</li>
<li>
<span class="hatena-asin-detail-label">メディア:</span> 単行本
</li>
<li>
<span class="hatena-asin-detail-label">購入</span>: 4人 <span class="hatena-asin-detail-label">クリック</span>: 145回
</li>
<li>
<a href="http://d.hatena.ne.jp/asin/4906391702" onclick="__gaTracker('send', 'event', 'outbound-article', 'http://d.hatena.ne.jp/asin/4906391702', 'この商品を含むブログ (30件) を見る');" target="_blank">この商品を含むブログ (30件) を見る</a>
</li>
</ul>
</div>
<div class="hatena-asin-detail-foot">
</div>
</div>
</div>