avformat: Add AMQP version 0-9-1 protocol support

Supports connecting to a RabbitMQ broker via AMQP version 0-9-1.

Signed-off-by: Andriy Gelman <andriy.gelman@gmail.com>
Signed-off-by: Marton Balint <cus@passwd.hu>

1 files changed, 298 insertions, 0 deletions

diff --git a/libavformat/libamqp.c b/libavformat/libamqp.c
new file mode 100644
index 0000000000..aaf0e51152
--- /dev/null
+++ b/libavformat/libamqp.c
@@ -0,0 +1,298 @@
+/*
+ * Advanced Message Queuing Protocol (AMQP) 0-9-1
+ * Copyright (c) 2020 Andriy Gelman
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <amqp.h>
+#include <amqp_tcp_socket.h>
+#include <sys/time.h>
+#include "avformat.h"
+#include "libavutil/avstring.h"
+#include "libavutil/opt.h"
+#include "libavutil/time.h"
+#include "network.h"
+#include "url.h"
+#include "urldecode.h"
+
+typedef struct AMQPContext {
+    const AVClass *class;
+    amqp_connection_state_t conn;
+    amqp_socket_t *socket;
+    const char *exchange;
+    const char *routing_key;
+    int pkt_size;
+    int64_t connection_timeout;
+    int pkt_size_overflow;
+} AMQPContext;
+
+#define STR_LEN           1024
+#define DEFAULT_CHANNEL   1
+
+#define OFFSET(x) offsetof(AMQPContext, x)
+#define D AV_OPT_FLAG_DECODING_PARAM
+#define E AV_OPT_FLAG_ENCODING_PARAM
+static const AVOption options[] = {
+    { "pkt_size", "Maximum send/read packet size", OFFSET(pkt_size), AV_OPT_TYPE_INT, { .i64 = 131072 }, 4096, INT_MAX, .flags = D | E },
+    { "exchange", "Exchange to send/read packets", OFFSET(exchange), AV_OPT_TYPE_STRING, { .str = "amq.direct" }, 0, 0, .flags = D | E },
+    { "routing_key", "Key to filter streams", OFFSET(routing_key), AV_OPT_TYPE_STRING, { .str = "amqp" }, 0, 0, .flags = D | E },
+    { "connection_timeout", "Initial connection timeout", OFFSET(connection_timeout), AV_OPT_TYPE_DURATION, { .i64 = -1 }, -1, INT64_MAX, .flags = D | E},
+    { NULL }
+};
+
+static int amqp_proto_open(URLContext *h, const char *uri, int flags)
+{
+    int ret, server_msg;
+    char hostname[STR_LEN], credentials[STR_LEN];
+    int port;
+    const char *user, *password = NULL;
+    const char *user_decoded, *password_decoded;
+    char *p;
+    amqp_rpc_reply_t broker_reply;
+    struct timeval tval = { 0 };
+
+    AMQPContext *s = h->priv_data;
+
+    h->is_streamed     = 1;
+    h->max_packet_size = s->pkt_size;
+
+    av_url_split(NULL, 0, credentials, sizeof(credentials),
+                 hostname, sizeof(hostname), &port, NULL, 0, uri);
+
+    if (port < 0)
+        port = 5672;
+
+    if (hostname[0] == '\0' || port <= 0 || port > 65535 ) {
+        av_log(h, AV_LOG_ERROR, "Invalid hostname/port\n");
+        return AVERROR(EINVAL);
+    }
+
+    p = strchr(credentials, ':');
+    if (p) {
+        *p = '\0';
+        password = p + 1;
+    }
+
+    if (!password || *password == '\0')
+        password = "guest";
+
+    password_decoded = ff_urldecode(password, 0);
+    if (!password_decoded)
+        return AVERROR(ENOMEM);
+
+    user = credentials;
+    if (*user == '\0')
+        user = "guest";
+
+    user_decoded = ff_urldecode(user, 0);
+    if (!user_decoded) {
+        av_freep(&password_decoded);
+        return AVERROR(ENOMEM);
+    }
+
+    s->conn = amqp_new_connection();
+    if (!s->conn) {
+        av_freep(&user_decoded);
+        av_freep(&password_decoded);
+        av_log(h, AV_LOG_ERROR, "Error creating connection\n");
+        return AVERROR_EXTERNAL;
+    }
+
+    s->socket = amqp_tcp_socket_new(s->conn);
+    if (!s->socket) {
+        av_log(h, AV_LOG_ERROR, "Error creating socket\n");
+        goto destroy_connection;
+    }
+
+    if (s->connection_timeout < 0)
+        s->connection_timeout = (h->rw_timeout > 0 ? h->rw_timeout : 5000000);
+
+    tval.tv_sec  = s->connection_timeout / 1000000;
+    tval.tv_usec = s->connection_timeout % 1000000;
+    ret = amqp_socket_open_noblock(s->socket, hostname, port, &tval);
+
+    if (ret) {
+        av_log(h, AV_LOG_ERROR, "Error connecting to server: %s\n",
+                                 amqp_error_string2(ret));
+        goto destroy_connection;
+    }
+
+    broker_reply = amqp_login(s->conn, "/", 0, s->pkt_size, 0,
+                              AMQP_SASL_METHOD_PLAIN, user_decoded, password_decoded);
+
+    if (broker_reply.reply_type != AMQP_RESPONSE_NORMAL) {
+        av_log(h, AV_LOG_ERROR, "Error login\n");
+        server_msg = AMQP_ACCESS_REFUSED;
+        goto close_connection;
+    }
+
+    amqp_channel_open(s->conn, DEFAULT_CHANNEL);
+    broker_reply = amqp_get_rpc_reply(s->conn);
+
+    if (broker_reply.reply_type != AMQP_RESPONSE_NORMAL) {
+        av_log(h, AV_LOG_ERROR, "Error set channel\n");
+        server_msg = AMQP_CHANNEL_ERROR;
+        goto close_connection;
+    }
+
+    if (h->flags & AVIO_FLAG_READ) {
+        amqp_bytes_t queuename;
+        char queuename_buff[STR_LEN];
+        amqp_queue_declare_ok_t *r;
+
+        r = amqp_queue_declare(s->conn, DEFAULT_CHANNEL, amqp_empty_bytes,
+                               0, 0, 0, 1, amqp_empty_table);
+        broker_reply = amqp_get_rpc_reply(s->conn);
+        if (!r || broker_reply.reply_type != AMQP_RESPONSE_NORMAL) {
+            av_log(h, AV_LOG_ERROR, "Error declare queue\n");
+            server_msg = AMQP_RESOURCE_ERROR;
+            goto close_channel;
+        }
+
+        /* store queuename */
+        queuename.bytes = queuename_buff;
+        queuename.len = FFMIN(r->queue.len, STR_LEN);
+        memcpy(queuename.bytes, r->queue.bytes, queuename.len);
+
+        amqp_queue_bind(s->conn, DEFAULT_CHANNEL, queuename,
+                        amqp_cstring_bytes(s->exchange),
+                        amqp_cstring_bytes(s->routing_key), amqp_empty_table);
+
+        broker_reply = amqp_get_rpc_reply(s->conn);
+        if (broker_reply.reply_type != AMQP_RESPONSE_NORMAL) {
+            av_log(h, AV_LOG_ERROR, "Queue bind error\n");
+            server_msg = AMQP_INTERNAL_ERROR;
+            goto close_channel;
+        }
+
+        amqp_basic_consume(s->conn, DEFAULT_CHANNEL, queuename, amqp_empty_bytes,
+                           0, 1, 0, amqp_empty_table);
+
+        broker_reply = amqp_get_rpc_reply(s->conn);
+        if (broker_reply.reply_type != AMQP_RESPONSE_NORMAL) {
+            av_log(h, AV_LOG_ERROR, "Set consume error\n");
+            server_msg = AMQP_INTERNAL_ERROR;
+            goto close_channel;
+        }
+    }
+
+    av_freep(&user_decoded);
+    av_freep(&password_decoded);
+    return 0;
+
+close_channel:
+    amqp_channel_close(s->conn, DEFAULT_CHANNEL, server_msg);
+close_connection:
+    amqp_connection_close(s->conn, server_msg);
+destroy_connection:
+    amqp_destroy_connection(s->conn);
+
+    av_freep(&user_decoded);
+    av_freep(&password_decoded);
+    return AVERROR_EXTERNAL;
+}
+
+static int amqp_proto_write(URLContext *h, const unsigned char *buf, int size)
+{
+    int ret;
+    AMQPContext *s = h->priv_data;
+    int fd = amqp_socket_get_sockfd(s->socket);
+
+    amqp_bytes_t message = { size, (void *)buf };
+    amqp_basic_properties_t props;
+
+    ret = ff_network_wait_fd_timeout(fd, 1, h->rw_timeout, &h->interrupt_callback);
+    if (ret)
+        return ret;
+
+    props._flags = AMQP_BASIC_CONTENT_TYPE_FLAG | AMQP_BASIC_DELIVERY_MODE_FLAG;
+    props.content_type = amqp_cstring_bytes("octet/stream");
+    props.delivery_mode = 2; /* persistent delivery mode */
+
+    ret = amqp_basic_publish(s->conn, DEFAULT_CHANNEL, amqp_cstring_bytes(s->exchange),
+                             amqp_cstring_bytes(s->routing_key), 0, 0,
+                             &props, message);
+
+    if (ret) {
+        av_log(h, AV_LOG_ERROR, "Error publish: %s\n", amqp_error_string2(ret));
+        return AVERROR_EXTERNAL;
+    }
+
+    return size;
+}
+
+static int amqp_proto_read(URLContext *h, unsigned char *buf, int size)
+{
+    AMQPContext *s = h->priv_data;
+    int fd = amqp_socket_get_sockfd(s->socket);
+    int ret;
+
+    amqp_rpc_reply_t broker_reply;
+    amqp_envelope_t envelope;
+
+    ret = ff_network_wait_fd_timeout(fd, 0, h->rw_timeout, &h->interrupt_callback);
+    if (ret)
+        return ret;
+
+    amqp_maybe_release_buffers(s->conn);
+    broker_reply = amqp_consume_message(s->conn, &envelope, NULL, 0);
+
+    if (broker_reply.reply_type != AMQP_RESPONSE_NORMAL)
+        return AVERROR_EXTERNAL;
+
+    if (envelope.message.body.len > size) {
+        s->pkt_size_overflow = FFMAX(s->pkt_size_overflow, envelope.message.body.len);
+        av_log(h, AV_LOG_WARNING, "Message exceeds space in the buffer. "
+                                  "Message will be truncated. Setting -pkt_size %d "
+                                  "may resolve this issue.\n", s->pkt_size_overflow);
+    }
+    size = FFMIN(size, envelope.message.body.len);
+
+    memcpy(buf, envelope.message.body.bytes, size);
+    amqp_destroy_envelope(&envelope);
+
+    return size;
+}
+
+static int amqp_proto_close(URLContext *h)
+{
+    AMQPContext *s = h->priv_data;
+    amqp_channel_close(s->conn, DEFAULT_CHANNEL, AMQP_REPLY_SUCCESS);
+    amqp_connection_close(s->conn, AMQP_REPLY_SUCCESS);
+    amqp_destroy_connection(s->conn);
+
+    return 0;
+}
+
+static const AVClass amqp_context_class = {
+    .class_name = "amqp",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+const URLProtocol ff_libamqp_protocol = {
+    .name            = "amqp",
+    .url_close       = amqp_proto_close,
+    .url_open        = amqp_proto_open,
+    .url_read        = amqp_proto_read,
+    .url_write       = amqp_proto_write,
+    .priv_data_size  = sizeof(AMQPContext),
+    .priv_data_class = &amqp_context_class,
+    .flags           = URL_PROTOCOL_FLAG_NETWORK,
+};