Simple producer/consumer examples

1 files changed, 172 insertions, 0 deletions

diff --git a/examples/amqp_consumer.c b/examples/amqp_consumer.c
new file mode 100644
index 0000000..84c3669
--- /dev/null
+++ b/examples/amqp_consumer.c
@@ -0,0 +1,172 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+#include <stdint.h>
+#include <amqp.h>
+#include <amqp_framing.h>
+
+#include <unistd.h>
+#include <assert.h>
+
+#include "example_utils.h"
+
+#define SUMMARY_EVERY_US 1000000
+
+static void run(amqp_connection_state_t conn)
+{
+  long long start_time = now_microseconds();
+  int received = 0;
+  int previous_received = 0;
+  long long previous_report_time = start_time;
+  long long next_summary_time = start_time + SUMMARY_EVERY_US;
+
+  amqp_frame_t frame;
+  int result;
+  size_t body_received;
+  size_t body_target;
+
+  long long now;
+
+  while (1) {
+    now = now_microseconds();
+    if (now > next_summary_time) {
+      int countOverInterval = received - previous_received;
+      double intervalRate = countOverInterval / ((now - previous_report_time) / 1000000.0);
+      printf("%lld ms: Received %d - %d since last report (%d Hz)\n",
+	     (now - start_time) / 1000, received, countOverInterval, (int) intervalRate);
+
+      previous_received = received;
+      previous_report_time = now;
+      next_summary_time += SUMMARY_EVERY_US;
+    }
+
+    amqp_maybe_release_buffers(conn);
+    result = amqp_simple_wait_frame(conn, &frame);
+    if (result <= 0) return;
+
+    if (frame.frame_type != AMQP_FRAME_METHOD)
+      continue;
+
+    if (frame.payload.method.id != AMQP_BASIC_DELIVER_METHOD)
+      continue;
+
+    result = amqp_simple_wait_frame(conn, &frame);
+    if (result <= 0) return;
+    if (frame.frame_type != AMQP_FRAME_HEADER) {
+      fprintf(stderr, "Expected header!");
+      abort();
+    }
+
+    body_target = frame.payload.properties.body_size;
+    body_received = 0;
+
+    while (body_received < body_target) {
+      result = amqp_simple_wait_frame(conn, &frame);
+      if (result <= 0) return;
+
+      if (frame.frame_type != AMQP_FRAME_BODY) {
+	fprintf(stderr, "Expected body!");
+	abort();
+      }
+
+      body_received += frame.payload.body_fragment.len;
+      assert(body_received <= body_target);
+    }
+
+    received++;
+  }
+}
+
+int main(int argc, char const * const *argv) {
+  char const *hostname;
+  int port;
+  char const *exchange;
+  char const *bindingkey;
+
+  int sockfd;
+  amqp_connection_state_t conn;
+
+  amqp_rpc_reply_t result;
+  amqp_bytes_t queuename;
+
+  if (argc < 3) {
+    fprintf(stderr, "Usage: amqp_consumer host port\n");
+    return 1;
+  }
+
+  hostname = argv[1];
+  port = atoi(argv[2]);
+  exchange = ""; //argv[3];
+  bindingkey = "test queue"; //argv[4];
+
+  conn = amqp_new_connection();
+
+  die_on_error(sockfd = amqp_open_socket(hostname, port), "Opening socket");
+  amqp_set_sockfd(conn, sockfd);
+  die_on_amqp_error(amqp_login(conn, "/", 131072, AMQP_SASL_METHOD_PLAIN, "guest", "guest"),
+		    "Logging in");
+
+  {
+    amqp_queue_declare_t s =
+      (amqp_queue_declare_t) {
+        .ticket = 0,
+	.queue = {.len = 0, .bytes = NULL},
+	.passive = 0,
+	.durable = 0,
+	.exclusive = 0,
+	.auto_delete = 1,
+	.nowait = 0,
+	.arguments = {.num_entries = 0, .entries = NULL}
+      };
+    die_on_amqp_error(result = amqp_simple_rpc(conn, 1, AMQP_QUEUE_DECLARE_METHOD,
+					       AMQP_QUEUE_DECLARE_OK_METHOD, &s),
+		      "Declaring queue");
+    amqp_queue_declare_ok_t *r = (amqp_queue_declare_ok_t *) result.reply.decoded;
+    queuename = amqp_bytes_malloc_dup(r->queue);
+    if (queuename.bytes == NULL) {
+      die_on_error(-ENOMEM, "Copying queue name");
+    }
+  }
+
+  {
+    amqp_queue_bind_t s =
+      (amqp_queue_bind_t) {
+        .ticket = 0,
+	.queue = queuename,
+	.exchange = amqp_cstring_bytes(exchange),
+	.routing_key = amqp_cstring_bytes(bindingkey),
+	.nowait = 0,
+	.arguments = {.num_entries = 0, .entries = NULL}
+      };
+    die_on_amqp_error(result = amqp_simple_rpc(conn, 1, AMQP_QUEUE_BIND_METHOD,
+					       AMQP_QUEUE_BIND_OK_METHOD, &s),
+		      "Binding queue");
+  }
+
+  {
+    amqp_basic_consume_t s =
+      (amqp_basic_consume_t) {
+        .ticket = 0,
+	.queue = queuename,
+	.consumer_tag = {.len = 0, .bytes = NULL},
+	.no_local = 0,
+	.no_ack = 1,
+	.exclusive = 0,
+	.nowait = 0
+      };
+    die_on_amqp_error(result = amqp_simple_rpc(conn, 1, AMQP_BASIC_CONSUME_METHOD,
+					       AMQP_BASIC_CONSUME_OK_METHOD, &s),
+		      "Consuming");
+  }
+
+  run(conn);
+
+  die_on_amqp_error(amqp_channel_close(conn, AMQP_REPLY_SUCCESS), "Closing channel");
+  die_on_amqp_error(amqp_connection_close(conn, AMQP_REPLY_SUCCESS), "Closing connection");
+  amqp_destroy_connection(conn);
+  die_on_error(close(sockfd), "Closing socket");
+
+  return 0;
+}