Remove ->shutdown of struct receiver.
[paraslash.git] / http_recv.c
1 /*
2 * Copyright (C) 2005-2009 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 <regex.h>
10 #include <sys/types.h>
11 #include <dirent.h>
12
13 #include "para.h"
14 #include "error.h"
15 #include "http.h"
16 #include "list.h"
17 #include "sched.h"
18 #include "ggo.h"
19 #include "recv.h"
20 #include "http_recv.cmdline.h"
21 #include "net.h"
22 #include "string.h"
23 #include "fd.h"
24 #include "buffer_tree.h"
25
26 /** the output buffer size of the http receiver */
27 #define BUFSIZE (32 * 1024)
28
29 /**
30 * the possible states of a http receiver node
31 *
32 * \sa receiver_node
33 */
34 enum http_recv_status {HTTP_CONNECTED, HTTP_SENT_GET_REQUEST, HTTP_STREAMING};
35
36 /**
37 * Data specific to the http receiver.
38 *
39 * Each running instance of the http receiver reserves space for one such struct.
40 */
41 struct private_http_recv_data {
42 /**
43 * The current status of the http receiver node.
44 *
45 * It gets initialized to \p HTTP_CONNECTED by the open function of the
46 * http receiver.
47 *
48 * \sa receiver::open, receiver_node.
49 */
50 enum http_recv_status status;
51 /**
52 * The file descriptor used for receiving the http stream.
53 *
54 * The pre_select function of the http receiver adds this file descriptor to
55 * the set of file decriptors which are checked for reading/writing (depending
56 * on the current status) by the select loop of the application (para_audiod or
57 * para_recv).
58 *
59 * The post_select function of the http receiver uses \a fd, if ready, to
60 * establish the http connection, and updates \a status according to the new
61 * state of the connection. As soon as \a status is \p HTTP_STREAMING, \a fd is
62 * going to be only checked for reading. If data is available, it is read into
63 * the output buffer of the receiver node by post_select.
64 *
65 * \sa receiver::pre_select receiver::post_select receiver_node, http_recv_status
66 */
67 int fd;
68 struct btr_pool *btrp;
69 };
70
71 static char *make_request_msg(void)
72 {
73 char *ret, *hn = para_hostname();
74 ret = make_message("%s1.0\nHost: %s\nUser-Agent: para_recv/%s\n\n\n",
75 HTTP_GET_MSG, hn, PACKAGE_VERSION);
76 free(hn);
77 return ret;
78 }
79
80 static void http_recv_pre_select(struct sched *s, struct task *t)
81 {
82 struct receiver_node *rn = container_of(t, struct receiver_node, task);
83 struct private_http_recv_data *phd = rn->private_data;
84 int ret;
85
86 if (rn->btrn) {
87 ret = generic_recv_pre_select(s, t);
88 if (ret <= 0)
89 return;
90 }
91 t->error = 0;
92 if (phd->status == HTTP_CONNECTED)
93 para_fd_set(phd->fd, &s->wfds, &s->max_fileno);
94 else
95 para_fd_set(phd->fd, &s->rfds, &s->max_fileno);
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 struct btr_node *btrn = rn->btrn;
103 int ret;
104
105 t->error = 0;
106 if (btrn) {
107 ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
108 if (ret < 0)
109 goto err;
110 if (ret == 0)
111 return;
112 } else {
113 if (rn->output_error && *rn->output_error < 0) {
114 ret = *rn->output_error;
115 goto err;
116 }
117 }
118 if (phd->status == HTTP_CONNECTED) {
119 char *rq;
120 if (!FD_ISSET(phd->fd, &s->wfds))
121 return;
122 rq = make_request_msg();
123 PARA_INFO_LOG("sending http request\n");
124 ret = send_va_buffer(phd->fd, "%s", rq);
125 free(rq);
126 if (ret < 0)
127 goto err;
128 phd->status = HTTP_SENT_GET_REQUEST;
129 return;
130 }
131 if (!FD_ISSET(phd->fd, &s->rfds))
132 return;
133 if (phd->status == HTTP_SENT_GET_REQUEST) {
134 ret = recv_pattern(phd->fd, HTTP_OK_MSG, strlen(HTTP_OK_MSG));
135 if (ret < 0)
136 goto err;
137 PARA_INFO_LOG("received ok msg, streaming\n");
138 phd->status = HTTP_STREAMING;
139 return;
140 }
141 if (btrn) {
142 char *buf;
143 size_t sz;
144
145 sz = btr_pool_get_buffer(phd->btrp, &buf);
146 //PARA_CRIT_LOG("max buffer %p: %zu\n", buf, sz);
147 ret = -E_HTTP_RECV_OVERRUN;
148 if (sz == 0)
149 goto err;
150 //buf = para_malloc(HTTP_RECV_READ_BUF_SIZE);
151 //sz = HTTP_RECV_READ_BUF_SIZE;
152 ret = recv_bin_buffer(phd->fd, buf, sz);
153 if (ret == 0)
154 ret = -E_RECV_EOF;
155 if (ret < 0)
156 goto err;
157 btr_add_output_pool(phd->btrp, ret, btrn);
158 return;
159 }
160 ret = -E_HTTP_RECV_OVERRUN;
161 if (rn->loaded >= BUFSIZE)
162 goto err;
163 ret = recv_bin_buffer(phd->fd, rn->buf + rn->loaded,
164 BUFSIZE - rn->loaded);
165 if (ret == 0)
166 ret = -E_RECV_EOF;
167 if (ret < 0)
168 goto err;
169 rn->loaded += ret;
170 return;
171 err:
172 if (btrn)
173 btr_remove_node(rn->btrn);
174 t->error = ret;
175 }
176
177 static void http_recv_close(struct receiver_node *rn)
178 {
179 struct private_http_recv_data *phd = rn->private_data;
180
181 close(phd->fd);
182 btr_pool_free(phd->btrp);
183 free(rn->buf);
184 free(rn->private_data);
185 }
186
187 static void *http_recv_parse_config(int argc, char **argv)
188 {
189 struct http_recv_args_info *tmp = para_calloc(sizeof(struct http_recv_args_info));
190
191 if (!http_recv_cmdline_parser(argc, argv, tmp))
192 return tmp;
193 free(tmp);
194 return NULL;
195 }
196
197 static int http_recv_open(struct receiver_node *rn)
198 {
199 struct private_http_recv_data *phd;
200 struct http_recv_args_info *conf = rn->conf;
201 int fd, ret = makesock(AF_UNSPEC, IPPROTO_TCP, 0, conf->host_arg,
202 conf->port_arg);
203
204 if (ret < 0)
205 return ret;
206 fd = ret;
207 ret = mark_fd_nonblocking(fd);
208 if (ret < 0) {
209 close(fd);
210 return ret;
211 }
212 rn->buf = para_calloc(BUFSIZE);
213 rn->private_data = phd = para_calloc(sizeof(struct private_http_recv_data));
214 phd->fd = fd;
215 phd->status = HTTP_CONNECTED;
216 phd->btrp = btr_pool_new("http_recv", 320 * 1024);
217 return 1;
218 }
219
220 static void http_recv_free_config(void *conf)
221 {
222 http_recv_cmdline_parser_free(conf);
223 }
224
225 /**
226 * The init function of the http receiver.
227 *
228 * \param r Pointer to the receiver struct to initialize.
229 *
230 * This initializes all function pointers of \a r.
231 */
232 void http_recv_init(struct receiver *r)
233 {
234 struct http_recv_args_info dummy;
235
236 http_recv_cmdline_parser_init(&dummy);
237 r->open = http_recv_open;
238 r->close = http_recv_close;
239 r->pre_select = http_recv_pre_select;
240 r->post_select = http_recv_post_select;
241 r->parse_config = http_recv_parse_config;
242 r->free_config = http_recv_free_config;
243 r->help = (struct ggo_help) {
244 .short_help = http_recv_args_info_help,
245 .detailed_help = http_recv_args_info_detailed_help
246 };
247 http_recv_cmdline_parser_free(&dummy);
248 }