src/server/daemon/sessionhandler.c

Fri, 28 Jun 2013 14:52:35 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Fri, 28 Jun 2013 14:52:35 +0200
changeset 81
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parent 79
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child 106
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permissions
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preparation for admin interface

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2013 Olaf Wintermann. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 #include <stdio.h>
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30 #include <stdlib.h>
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31 #include <errno.h>
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32
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33 #include "../public/nsapi.h"
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35 #include "sessionhandler.h"
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36 #include "httprequest.h"
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37 #include "httpparser.h"
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38 #include "log.h"
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39 #include "error.h"
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40 #include "httplistener.h"
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41
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42 typedef struct _event_http_io {
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43 HTTPRequest *request;
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44 HttpParser *parser;
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45 } EventHttpIO;
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46
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47 SessionHandler* create_basic_session_handler() {
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48 BasicSessionHandler *handler = malloc(sizeof(BasicSessionHandler));
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49 handler->threadpool = threadpool_new(4, 8);
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50 handler->sh.enqueue_connection = basic_enq_conn;
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53 return (SessionHandler*)handler;
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54 }
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55
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56 void basic_enq_conn(SessionHandler *handler, Connection *conn) {
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57 BasicSessionHandler *sh = (BasicSessionHandler*)handler;
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58 conn->session_handler = handler;
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59 threadpool_run(sh->threadpool, basic_run_session, conn);
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60 }
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61
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62 void* basic_run_session(void *data) {
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63 Connection *conn = (Connection*)data;
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64
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65 HTTPRequest request;
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66 http_request_init(&request);
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67 request.connection = conn;
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68
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69 // read request
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70 netbuf *buf = malloc(sizeof(netbuf));
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71 buf->rdtimeout = 120;
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72 buf->pos = 0;
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73 buf->cursize = 0;
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74 buf->maxsize = 2048;
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75 buf->sd = &conn->fd;
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76 buf->inbuf = malloc(2048);
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77 buf->errmsg = NULL;
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78
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79 request.netbuf = buf;
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80
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81 HttpParser *parser = http_parser_new(&request);
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82 int state;
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83 int r;
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84 r = read(conn->fd, buf->inbuf + buf->pos, buf->maxsize - buf->pos);
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85 if(r == -1) {
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86 // TODO: error handling
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87 fprintf(stderr, "%s\n", "Error: Cannot read from socket");
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88 return NULL;
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89 }
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90 buf->cursize += r;
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91 while((state = http_parser_process(parser)) != 0) {
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92 if(state == 2) {
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93 // TODO: error handling
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94 fprintf(stderr, "%s\n", "Error: Cannot parse http request");
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95 return NULL;
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96 }
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97 r = read(conn->fd, buf->inbuf + buf->pos, buf->maxsize - buf->pos);
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98 if(r == -1) {
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99 // TODO: error handling
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100 fprintf(stderr, "%s\n", "Error: Cannot read from socket");
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101 return NULL;
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102 }
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103 buf->cursize += r;
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104 }
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105
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106 // process request
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107 r = handle_request(&request, NULL); // TODO: use correct thread pool
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108
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109 // TODO: free, see evt_request_finish
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110
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111 return NULL;
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112 }
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113
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114 void basic_keep_alive(SessionHandler *handler, Connection *conn) {
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115
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116 }
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117
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118
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119 /* ----- event session handler ----- */
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120
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121 SessionHandler* create_event_session_handler() {
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122 EventSessionHandler *handler = malloc(sizeof(EventSessionHandler));
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123 handler->eventhandler = get_default_event_handler();
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124 handler->sh.enqueue_connection = evt_enq_conn;
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125 handler->sh.keep_alive = evt_keep_alive;
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126 return (SessionHandler*)handler;
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127 }
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128
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129 void evt_enq_conn(SessionHandler *handler, Connection *conn) {
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130 HTTPRequest *request = malloc(sizeof(HTTPRequest));
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131 http_request_init(request);
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132 request->connection = conn;
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133 conn->session_handler = handler;
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134
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135 // set socket non blocking
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136 int flags;
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137 if (-1 == (flags = fcntl(conn->fd, F_GETFL, 0))) {
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138 flags = 0;
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139 }
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140 if (fcntl(conn->fd, F_SETFL, flags | O_NONBLOCK) != 0) {
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141 perror("Error: start_event_session: fcntl");
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142 // TODO: error
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143 }
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144
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145 // TODO: remove code redundancy (basic_run_session)
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146
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147 // read request
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148 netbuf *buf = malloc(sizeof(netbuf));
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149 buf->rdtimeout = 120;
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150 buf->pos = 0;
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151 buf->cursize = 0;
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152 buf->maxsize = 2048;
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153 buf->sd = &conn->fd;
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154 buf->inbuf = malloc(2048);
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155 buf->errmsg = NULL;
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156
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157 request->netbuf = buf;
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158
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159 HttpParser *parser = http_parser_new(request);
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160
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161 EventHttpIO *io = malloc(sizeof(EventHttpIO));
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162 if(io == NULL) {
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163 // TODO: error handling
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164 }
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165 io->request = request;
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166 io->parser = parser;
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167
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168 /*
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169 * to start the request handling, we begin with a poll on the socket,
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170 *
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171 * evt_enq_conn() --> event handler --> handle_request()
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172 */
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173
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174 event_handler_t *ev = ((EventSessionHandler*)handler)->eventhandler;
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175
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176 event_t *event = malloc(sizeof(event_t));
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177 event->fn = evt_request_input;
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178 event->finish = evt_request_finish;
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179 event->cookie = io;
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180
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181 if(ev_pollin(ev, conn->fd, event) != 0) {
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182 // TODO: ev_pollin should log, intercept some errors here
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183 log_ereport(LOG_WARN, "ev_pollin failed: %s", strerror(errno));
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184 close(conn->fd);
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185 // TODO: free stuff
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186 }
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187 }
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188
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189 int evt_request_input(event_handler_t *handler, event_t *event) {
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190 EventHttpIO *io = event->cookie;
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191 HttpParser *parser = io->parser;
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192 HTTPRequest *request = io->request;
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193 netbuf *buf = request->netbuf;
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194
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195 int state;
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196 int r;
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197 r = read(
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198 request->connection->fd,
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199 buf->inbuf + buf->pos,
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200 buf->maxsize - buf->pos);
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201 if(r == -1) {
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202 event->finish = evt_request_error;
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203 return 0;
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204 }
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205 //fwrite(buf->inbuf + buf->pos, 1, r, stdout);
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206 //printf("\n");
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207
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208 buf->cursize += r;
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209 state = http_parser_process(parser);
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210 if(state == 2) {
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211 // parse error
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212 fatal_error(request, 400);
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213 event->finish = evt_request_error;
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214 return 0;
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215 } else if(state == 1) {
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216 /*
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217 * we need more data -> return 1 to tell the event handler to
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218 * continue polling
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219 */
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220 return 1;
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221 }
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222
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223 // we are done with reading
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224
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225 // set socket blocking
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226 int flags;
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227 if (-1 == (flags = fcntl(request->connection->fd, F_GETFL, 0))) {
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228 flags = 0;
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229 }
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230 if (fcntl(request->connection->fd, F_SETFL, flags & ~O_NONBLOCK) != 0) {
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231 // just close the connection if fcntl fails
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232 event->finish = evt_request_error;
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233 return 0;
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234 }
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235
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236 /*
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237 * process request
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238 *
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239 * We return 0 to finish request input. The event handler than stops
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240 * polling and executes event->finish (evt_request_input_finish)
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241 */
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242 return 0;
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243 }
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244
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245 int evt_request_finish(event_handler_t *h, event_t *event) {
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246 EventHttpIO *io = event->cookie;
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247 HttpParser *parser = io->parser;
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248 HTTPRequest *request = io->request;
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249
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250 int r = handle_request(request, NULL);
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251 if(r != 0) {
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252 // TODO: error message
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253 close(request->connection->fd);
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254 }
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255
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256 /*
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257 * handle_request can return before the request is finished, but it copies
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258 * all important data. We can free request, parser and event
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259 *
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260 * don't free request->netbuf and request->connection
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261 */
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262 header_array_free(request->headers);
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263 free(request);
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264
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265 http_parser_free(parser);
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266
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267 free(io);
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268 free(event);
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269
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270 return 0;
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271 }
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272
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273 int evt_request_error(event_handler_t *h, event_t *event) {
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274 EventHttpIO *io = event->cookie;
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275 HttpParser *parser = io->parser;
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276 HTTPRequest *request = io->request;
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277
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278 close(request->connection->fd);
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279 cfg_unref(request->connection->listener->cfg);
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280
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281 header_array_free(request->headers);
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282 free(request);
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283
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284 http_parser_free(parser);
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285
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286 free(io);
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287 free(event);
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288
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289 return 0;
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290 }
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291
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292 void evt_keep_alive(SessionHandler *handler, Connection *conn) {
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293 // TODO: set timeout
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294
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295 /* TODO:
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296 * Don't just re-enqueue the connection
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297 * create a evt_req_init function which does most of the evt_enq_conn stuff
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298 * but don't poll.
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299 * evt_keep_alive should poll and if an event occurs:
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300 * evt_req_init
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301 * evt_request_input
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302 * evt_enq_conn should do:
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303 * evt_req_init
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304 * ev_pollin
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305 */
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306 evt_enq_conn(handler, conn);
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diff changeset
307 }

mercurial