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comparison net/http.lua @ 616:69bc5782b25e

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Non-blocking HTTP requests (adding net.http)
author Matthew Wild <mwild1@gmail.com>
date Fri, 12 Dec 2008 04:06:15 +0000
parents
children b17fd66b7e10
comparison
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615:4ae3e81513f3 616:69bc5782b25e
1
2 local socket = require "socket"
3 local mime = require "mime"
4 local url = require "socket.url"
5
6 local server = require "net.server"
7
8 local connlisteners_get = require "net.connlisteners".get;
9 local listener = connlisteners_get("httpclient") or error("No httpclient listener!");
10
11 local t_insert, t_concat = table.insert, table.concat;
12 local tonumber, tostring, pairs = tonumber, tostring, pairs;
13 local print = function () end
14
15 local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end });
16 local urlencode = function (s) return s and (s:gsub("%W", function (c) return string.format("%%%x", c:byte()); end)); end
17
18 module "http"
19
20 local function expectbody(reqt, code)
21 if reqt.method == "HEAD" then return nil end
22 if code == 204 or code == 304 then return nil end
23 if code >= 100 and code < 200 then return nil end
24 return 1
25 end
26
27 local function request_reader(request, data, startpos)
28 if not data then
29 if request.body then
30 request.callback(t_concat(request.body));
31 else
32 -- Error.. connection was closed prematurely
33 request.callback(nil, "connection-closed");
34 end
35 destroy_request(request);
36 return;
37 end
38 if request.state == "body" then
39 print("Reading body...")
40 if not request.body then request.body = {}; request.havebodylength, request.bodylength = 0, tonumber(request.responseheaders["content-length"]); end
41 if startpos then
42 data = data:sub(startpos, -1)
43 end
44 t_insert(request.body, data);
45 if request.bodylength then
46 request.havebodylength = request.havebodylength + #data;
47 if request.havebodylength >= request.bodylength then
48 -- We have the body
49 if request.callback then
50 request.callback(t_concat(request.body));
51 end
52 end
53 print("", "Have "..request.havebodylength.." bytes out of "..request.bodylength);
54 end
55 elseif request.state == "headers" then
56 print("Reading headers...")
57 local pos = startpos;
58 local headers = request.responseheaders or {};
59 for line in data:sub(startpos, -1):gmatch("(.-)\r\n") do
60 startpos = startpos + #line + 2;
61 local k, v = line:match("(%S+): (.+)");
62 if k and v then
63 headers[k:lower()] = v;
64 print("Header: "..k:lower().." = "..v);
65 elseif #line == 0 then
66 request.responseheaders = headers;
67 break;
68 else
69 print("Unhandled header line: "..line);
70 end
71 end
72 -- Reached the end of the headers
73 request.state = "body";
74 if #data > startpos then
75 return request_reader(request, data, startpos);
76 end
77 elseif request.state == "status" then
78 print("Reading status...")
79 local http, code, text, linelen = data:match("^HTTP/(%S+) (%d+) (.-)\r\n()", startpos);
80 if not code then
81 return request.callback(nil, "invalid-status-line", data);
82 end
83
84 request.responsecode, request.responseversion = code, http;
85
86 if request.onlystatus or not expectbody(request, tonumber(code)) then
87 if request.callback then
88 request.callback(code);
89 end
90 destroy_request(request);
91 return;
92 end
93
94 request.state = "headers";
95
96 if #data > linelen then
97 return request_reader(request, data, linelen);
98 end
99 end
100 end
101
102 function request(u, callback, ex)
103 local req = url.parse(u);
104
105 local custom_headers, body;
106 local default_headers = { ["Host"] = req.host, ["User-Agent"] = "Prosody XMPP Server" }
107
108
109 if req.userinfo then
110 default_headers["Authorization"] = "Basic "..mime.b64(req.userinfo);
111 end
112
113 if ex then
114 custom_headers = ex.custom_headers;
115 req.onlystatus = ex.onlystatus;
116 body = ex.body;
117 if body then
118 req.method = "POST ";
119 default_headers["Content-Length"] = tostring(#body);
120 default_headers["Content-Type"] = "application/x-www-form-urlencoded";
121 end
122 if ex.method then req.method = ex.method; end
123 end
124
125 req.handler, req.conn = server.wraptcpclient(listener, socket.tcp(), req.host, req.port or 80, 0, "*a");
126 req.write = req.handler.write;
127 req.conn:settimeout(0);
128 local ok, err = req.conn:connect(req.host, req.port or 80);
129 if not ok and err ~= "timeout" then
130 return nil, err;
131 end
132
133 req.write((req.method or "GET ")..req.path.." HTTP/1.0\r\n");
134 local t = { [2] = ": ", [4] = "\r\n" };
135 if custom_headers then
136 for k, v in pairs(custom_headers) do
137 t[1], t[3] = k, v;
138 req.write(t_concat(t));
139 default_headers[k] = nil;
140 end
141 end
142
143 for k, v in pairs(default_headers) do
144 t[1], t[3] = k, v;
145 req.write(t_concat(t));
146 default_headers[k] = nil;
147 end
148 req.write("\r\n");
149
150 if body then
151 req.write(body);
152 end
153
154 req.callback = callback;
155 req.reader = request_reader;
156 req.state = "status"
157
158 listener.register_request(req.handler, req);
159
160 server.loop()
161 return req;
162 end
163
164 function destroy_request(request)
165 if request.conn then
166 request.handler.close()
167 listener.disconnect(request.conn, "closed");
168 end
169 end
170
171 _M.urlencode = urlencode;
172
173 return _M;