stdin: Abort if the consumer terminates.
[paraslash.git] / http_recv.c
1 /*
2 * Copyright (C) 2005-2008 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file http_recv.c paraslash's http receiver */
8
9 #include <sys/types.h>
10 #include <dirent.h>
11
12 #include "para.h"
13 #include "error.h"
14 #include "http.h"
15 #include "list.h"
16 #include "sched.h"
17 #include "recv.h"
18 #include "http_recv.cmdline.h"
19 #include "net.h"
20 #include "string.h"
21 #include "fd.h"
22
23 /** the output buffer size of the http receiver */
24 #define BUFSIZE (32 * 1024)
25
26 /**
27 * the possible states of a http receiver node
28 *
29 * \sa receiver_node
30 */
31 enum http_recv_status {HTTP_CONNECTED, HTTP_SENT_GET_REQUEST, HTTP_STREAMING};
32
33 /**
34 * data specific to the http receiver
35 *
36 * Each running instance of the http receiver reserves space for one such struct.
37 */
38 struct private_http_recv_data {
39 /**
40 *
41 *
42 * the current status of the http receiver node
43 *
44 * It gets initialized to \p HTTP_CONNECTED by the open function of the
45 * http receiver.
46 *
47 * \sa receiver::open, receiver_node.
48 */
49 enum http_recv_status status;
50 /**
51 *
52 *
53 * the file descriptor used for receiving the http stream
54 *
55 * The pre_select function of the http receiver adds this file descriptor to
56 * the set of file decriptors which are checked for reading/writing (depending
57 * on the current status) by the select loop of the application (para_audiod or
58 * para_recv).
59 *
60 * The post_select function of the http receiver uses \a fd, if ready, to
61 * establish the http connection, and updates \a status according to the new
62 * state of the connection. As soon as \a status is \p HTTP_STREAMING, \a fd is
63 * going to be only checked for reading. If data is available, it is read into
64 * the output buffer of the receiver node by post_select.
65 *
66 * \sa receiver::pre_select receiver::post_select receiver_node, http_recv_status
67 */
68 int fd;
69 };
70
71 static void http_shutdown(void)
72 {
73 return;
74 }
75
76 static char *make_request_msg(void)
77 {
78 char *ret, *hn = para_hostname();
79 ret = make_message("%s1.0\nHost: %s\nUser-Agent: para_recv/%s\n\n\n",
80 HTTP_GET_MSG, hn, PACKAGE_VERSION);
81 free(hn);
82 return ret;
83 }
84
85 static void http_recv_pre_select(struct sched *s, struct task *t)
86 {
87 struct receiver_node *rn = container_of(t, struct receiver_node, task);
88 struct private_http_recv_data *phd = rn->private_data;
89
90 t->error = 0;
91 if (phd->status == HTTP_CONNECTED)
92 para_fd_set(phd->fd, &s->wfds, &s->max_fileno);
93 else
94 para_fd_set(phd->fd, &s->rfds, &s->max_fileno);
95 }
96
97
98 static void http_recv_post_select(struct sched *s, struct task *t)
99 {
100 struct receiver_node *rn = container_of(t, struct receiver_node, task);
101 struct private_http_recv_data *phd = rn->private_data;
102
103 if (rn->output_error && *rn->output_error < 0) {
104 t->error = *rn->output_error;
105 return;
106 }
107 if (phd->status == HTTP_CONNECTED) {
108 char *rq;
109 if (!FD_ISSET(phd->fd, &s->wfds))
110 return;
111 rq = make_request_msg();
112 PARA_INFO_LOG("sending http request\n");
113 t->error = send_va_buffer(phd->fd, "%s", rq);
114 free(rq);
115 if (t->error >= 0)
116 phd->status = HTTP_SENT_GET_REQUEST;
117 return;
118 }
119 if (!FD_ISSET(phd->fd, &s->rfds))
120 return;
121 if (phd->status == HTTP_SENT_GET_REQUEST) {
122 t->error = recv_pattern(phd->fd, HTTP_OK_MSG, MAXLINE);
123 if (t->error >= 0) {
124 PARA_INFO_LOG("received ok msg, streaming\n");
125 phd->status = HTTP_STREAMING;
126 }
127 return;
128 }
129 if (rn->loaded >= BUFSIZE) {
130 t->error = -E_HTTP_RECV_OVERRUN;
131 return;
132 }
133 t->error = recv_bin_buffer(phd->fd, rn->buf + rn->loaded,
134 BUFSIZE - rn->loaded);
135 if (t->error > 0) {
136 rn->loaded += t->error;
137 return;
138 }
139 if (!t->error)
140 t->error = -E_RECV_EOF;
141 }
142
143 static void http_recv_close(struct receiver_node *rn)
144 {
145 struct private_http_recv_data *phd = rn->private_data;
146 close(phd->fd);
147 free(rn->buf);
148 free(rn->private_data);
149 }
150
151 static void *http_recv_parse_config(int argc, char **argv)
152 {
153 struct http_recv_args_info *tmp = para_calloc(sizeof(struct http_recv_args_info));
154
155 if (!http_recv_cmdline_parser(argc, argv, tmp))
156 return tmp;
157 free(tmp);
158 return NULL;
159 }
160
161 static int http_recv_open(struct receiver_node *rn)
162 {
163 struct private_http_recv_data *phd;
164 struct http_recv_args_info *conf = rn->conf;
165 int fd, ret = makesock(AF_UNSPEC, IPPROTO_TCP, 0, conf->host_arg,
166 conf->port_arg);
167
168 if (ret < 0)
169 return ret;
170 fd = ret;
171 ret = mark_fd_nonblocking(fd);
172 if (ret < 0) {
173 close(fd);
174 return ret;
175 }
176 rn->buf = para_calloc(BUFSIZE);
177 rn->private_data = phd = para_calloc(sizeof(struct private_http_recv_data));
178 phd->fd = fd;
179 phd->status = HTTP_CONNECTED;
180 return 1;
181 }
182
183 /**
184 * the init function of the http receiver
185 *
186 * \param r pointer to the receiver struct to initialize
187 *
188 * Just initialize all function pointers of \a r.
189 */
190 void http_recv_init(struct receiver *r)
191 {
192 r->open = http_recv_open;
193 r->close = http_recv_close;
194 r->pre_select = http_recv_pre_select;
195 r->post_select = http_recv_post_select;
196 r->shutdown = http_shutdown;
197 r->parse_config = http_recv_parse_config;
198 }