Add execute mechanism to receiver nodes.
[paraslash.git] / http_recv.c
1 /*
2 * Copyright (C) 2005-2012 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
12 #include "para.h"
13 #include "error.h"
14 #include "http.h"
15 #include "list.h"
16 #include "sched.h"
17 #include "ggo.h"
18 #include "buffer_tree.h"
19 #include "recv.h"
20 #include "http_recv.cmdline.h"
21 #include "net.h"
22 #include "string.h"
23 #include "fd.h"
24
25 /**
26 * the possible states of a http receiver node
27 *
28 * \sa receiver_node
29 */
30 enum http_recv_status {HTTP_CONNECTED, HTTP_SENT_GET_REQUEST, HTTP_STREAMING};
31
32 /**
33 * Data specific to the http receiver.
34 *
35 * Each running instance of the http receiver reserves space for one such struct.
36 */
37 struct private_http_recv_data {
38 /**
39 * The current status of the http receiver node.
40 *
41 * It gets initialized to \p HTTP_CONNECTED by the open function of the
42 * http receiver.
43 *
44 * \sa receiver::open, receiver_node.
45 */
46 enum http_recv_status status;
47 };
48
49 static char *make_request_msg(void)
50 {
51 char *ret, *hn = para_hostname();
52 ret = make_message("%s1.0\nHost: %s\nUser-Agent: para_recv/%s\n\n\n",
53 HTTP_GET_MSG, hn, PACKAGE_VERSION);
54 free(hn);
55 return ret;
56 }
57
58 static void http_recv_pre_select(struct sched *s, struct task *t)
59 {
60 struct receiver_node *rn = container_of(t, struct receiver_node, task);
61 struct private_http_recv_data *phd = rn->private_data;
62
63 t->error = 0;
64 if (generic_recv_pre_select(s, t) <= 0)
65 return;
66 if (phd->status == HTTP_CONNECTED)
67 para_fd_set(rn->fd, &s->wfds, &s->max_fileno);
68 else
69 para_fd_set(rn->fd, &s->rfds, &s->max_fileno);
70 }
71
72 /*
73 * Establish the http connection. If already established, fill the buffer pool
74 * area with data read from the socket. In any case, update the state of the
75 * connection if necessary.
76 */
77 static void http_recv_post_select(struct sched *s, struct task *t)
78 {
79 struct receiver_node *rn = container_of(t, struct receiver_node, task);
80 struct private_http_recv_data *phd = rn->private_data;
81 struct btr_node *btrn = rn->btrn;
82 int ret, iovcnt;
83 struct iovec iov[2];
84 size_t num_bytes;
85
86 ret = task_get_notification(t);
87 if (ret < 0)
88 goto out;
89 ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
90 if (ret < 0)
91 goto out;
92 if (ret == 0)
93 return;
94 if (phd->status == HTTP_CONNECTED) {
95 char *rq;
96 if (!FD_ISSET(rn->fd, &s->wfds))
97 return;
98 rq = make_request_msg();
99 PARA_INFO_LOG("sending http request\n");
100 ret = write_va_buffer(rn->fd, "%s", rq);
101 free(rq);
102 if (ret < 0)
103 goto out;
104 phd->status = HTTP_SENT_GET_REQUEST;
105 return;
106 }
107 if (phd->status == HTTP_SENT_GET_REQUEST) {
108 ret = read_pattern(rn->fd, HTTP_OK_MSG, strlen(HTTP_OK_MSG), &s->rfds);
109 if (ret < 0)
110 goto out;
111 if (ret == 0)
112 return;
113 PARA_INFO_LOG("received ok msg, streaming\n");
114 phd->status = HTTP_STREAMING;
115 return;
116 }
117 ret = -E_HTTP_RECV_OVERRUN;
118 iovcnt = btr_pool_get_buffers(rn->btrp, iov);
119 if (iovcnt == 0)
120 goto out;
121 ret = readv_nonblock(rn->fd, iov, iovcnt, &s->rfds, &num_bytes);
122 if (num_bytes == 0)
123 goto out;
124 if (num_bytes <= iov[0].iov_len) /* only the first buffer was filled */
125 btr_add_output_pool(rn->btrp, num_bytes, btrn);
126 else { /* both buffers contain data */
127 btr_add_output_pool(rn->btrp, iov[0].iov_len, btrn);
128 btr_add_output_pool(rn->btrp, num_bytes - iov[0].iov_len, btrn);
129 }
130 out:
131 if (ret >= 0)
132 return;
133 btr_remove_node(&rn->btrn);
134 t->error = ret;
135 }
136
137 static void http_recv_close(struct receiver_node *rn)
138 {
139 close(rn->fd);
140 btr_pool_free(rn->btrp);
141 free(rn->private_data);
142 }
143
144 static void *http_recv_parse_config(int argc, char **argv)
145 {
146 struct http_recv_args_info *tmp = para_calloc(sizeof(*tmp));
147
148 if (!http_recv_cmdline_parser(argc, argv, tmp))
149 return tmp;
150 free(tmp);
151 return NULL;
152 }
153
154 static int http_recv_open(struct receiver_node *rn)
155 {
156 struct private_http_recv_data *phd;
157 struct http_recv_args_info *conf = rn->conf;
158 int fd, ret = para_connect_simple(IPPROTO_TCP, conf->host_arg,
159 conf->port_arg);
160
161 if (ret < 0)
162 return ret;
163 fd = ret;
164 ret = mark_fd_nonblocking(fd);
165 if (ret < 0) {
166 close(fd);
167 return ret;
168 }
169 rn->private_data = phd = para_calloc(sizeof(struct private_http_recv_data));
170 rn->fd = fd;
171 phd->status = HTTP_CONNECTED;
172 rn->btrp = btr_pool_new("http_recv", 320 * 1024);
173 return 1;
174 }
175
176 static void http_recv_free_config(void *conf)
177 {
178 http_recv_cmdline_parser_free(conf);
179 free(conf);
180 }
181
182 /**
183 * The init function of the http receiver.
184 *
185 * \param r Pointer to the receiver struct to initialize.
186 *
187 * This initializes all function pointers of \a r.
188 */
189 void http_recv_init(struct receiver *r)
190 {
191 struct http_recv_args_info dummy;
192
193 http_recv_cmdline_parser_init(&dummy);
194 r->open = http_recv_open;
195 r->close = http_recv_close;
196 r->pre_select = http_recv_pre_select;
197 r->post_select = http_recv_post_select;
198 r->parse_config = http_recv_parse_config;
199 r->free_config = http_recv_free_config;
200 r->help = (struct ggo_help) {
201 .short_help = http_recv_args_info_help,
202 .detailed_help = http_recv_args_info_detailed_help
203 };
204 http_recv_cmdline_parser_free(&dummy);
205 }