1 /* Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
3 /** \file http_recv.c paraslash's http receiver */
6 #include <netinet/in.h>
7 #include <sys/socket.h>
14 #include "recv_cmd.lsg.h"
20 #include "buffer_tree.h"
27 * the possible states of a http receiver node
29 * \sa \ref receiver_node.
31 enum http_recv_status {HTTP_CONNECTED, HTTP_SENT_GET_REQUEST, HTTP_STREAMING};
34 * Data specific to the http receiver.
36 * Each running instance of the http receiver reserves space for one such struct.
38 struct private_http_recv_data {
40 * The current status of the http receiver node.
42 * It gets initialized to \p HTTP_CONNECTED by the open function of the
45 * \sa \ref receiver::open, \ref receiver_node.
47 enum http_recv_status status;
50 static char *make_request_msg(void)
52 char *ret, *hn = para_hostname();
53 ret = make_message("%s1.0\nHost: %s\nUser-Agent: para_recv/%s\n\n\n",
54 HTTP_GET_MSG, hn, PACKAGE_VERSION);
59 static void http_recv_pre_select(struct sched *s, void *context)
61 struct receiver_node *rn = context;
62 struct private_http_recv_data *phd = rn->private_data;
64 if (generic_recv_pre_select(s, rn) <= 0)
66 if (phd->status == HTTP_CONNECTED)
67 para_fd_set(rn->fd, &s->wfds, &s->max_fileno);
69 para_fd_set(rn->fd, &s->rfds, &s->max_fileno);
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.
77 static int http_recv_post_select(struct sched *s, void *context)
79 struct receiver_node *rn = context;
80 struct private_http_recv_data *phd = rn->private_data;
81 struct btr_node *btrn = rn->btrn;
86 ret = task_get_notification(rn->task);
89 ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
94 if (phd->status == HTTP_CONNECTED) {
96 if (!FD_ISSET(rn->fd, &s->wfds))
98 rq = make_request_msg();
99 PARA_INFO_LOG("sending http request\n");
100 ret = write_va_buffer(rn->fd, "%s", rq);
104 phd->status = HTTP_SENT_GET_REQUEST;
107 if (phd->status == HTTP_SENT_GET_REQUEST) {
108 ret = read_pattern(rn->fd, HTTP_OK_MSG, strlen(HTTP_OK_MSG), &s->rfds);
113 PARA_INFO_LOG("received ok msg, streaming\n");
114 phd->status = HTTP_STREAMING;
117 ret = -E_HTTP_RECV_OVERRUN;
118 iovcnt = btr_pool_get_buffers(rn->btrp, iov);
121 ret = readv_nonblock(rn->fd, iov, iovcnt, &s->rfds, &num_bytes);
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);
132 btr_remove_node(&rn->btrn);
136 static void http_recv_close(struct receiver_node *rn)
139 btr_pool_free(rn->btrp);
140 free(rn->private_data);
143 static int http_recv_open(struct receiver_node *rn)
145 struct private_http_recv_data *phd;
146 struct lls_parse_result *lpr = rn->lpr;
147 const char *r_i = RECV_CMD_OPT_STRING_VAL(HTTP, HOST, lpr);
148 uint32_t r_p = RECV_CMD_OPT_UINT32_VAL(HTTP, PORT, lpr);
149 int fd, ret = para_connect_simple(IPPROTO_TCP, r_i, r_p);
154 ret = mark_fd_nonblocking(fd);
159 rn->private_data = phd = para_calloc(sizeof(struct private_http_recv_data));
161 phd->status = HTTP_CONNECTED;
162 rn->btrp = btr_pool_new("http_recv", 320 * 1024);
166 /** See \ref recv_init(). */
167 const struct receiver lsg_recv_cmd_com_http_user_data = {
168 .open = http_recv_open,
169 .close = http_recv_close,
170 .pre_select = http_recv_pre_select,
171 .post_select = http_recv_post_select,