first cut on client and server

amqp/client.c

@@ -0,0 +1,180 @@
+
+/*
+ *  amqp_producer.c from
+ *  https://github.com/alanxz/rabbitmq-c/blob/master/examples/amqp_producer.c
+ *
+ *  This is an example of a AMQP client which requests a single URI, hello,
+ *  which is provided by a sample CoAP server also in the same github folder.
+ *
+ *  Starting with that source code, I am embellishing with more comments and
+ *  some additional functionality to explore the AMQP protocol.
+ *
+ *  To compile you must first have the RabbitMQ AMQP library installed using:
+ *    sudo apt-get install librabbitmq-dev
+ *
+ *  You will also need the FastJSON library for parsing JSON text libfastjson:
+ *    sudo apt-get install libfastjson-dev
+ *
+ *  You will need to specify the include path and you will need to specify
+ *  the define -DWITH_POSIX on the compiler command line.
+ *
+ *  cc -DWITH_POSIX -o client client.c -lrabbitmq -lfastjson
+*/
+
+
+#include <stdio.h>
+
+// header for the Fast JSON library. should be in /usr/include/libfastjson
+#include <libfastjson/json.h>
+
+/*
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MIT
+ *
+ * Portions created by Alan Antonuk are Copyright (c) 2012-2013
+ * Alan Antonuk. All Rights Reserved.
+ *
+ * Portions created by VMware are Copyright (c) 2007-2012 VMware, Inc.
+ * All Rights Reserved.
+ *
+ * Portions created by Tony Garnock-Jones are Copyright (c) 2009-2010
+ * VMware, Inc. and Tony Garnock-Jones. All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ * ***** END LICENSE BLOCK *****
+ */
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <amqp.h>
+#include <amqp_tcp_socket.h>
+
+#include "utils.h"
+
+#define SUMMARY_EVERY_US 1000000
+
+static void send_batch(amqp_connection_state_t conn, char const *queue_name,
+                       int rate_limit, int message_count) {
+  uint64_t start_time = now_microseconds();
+  int i;
+  int sent = 0;
+  int previous_sent = 0;
+  uint64_t previous_report_time = start_time;
+  uint64_t next_summary_time = start_time + SUMMARY_EVERY_US;
+
+  char message[256];
+  amqp_bytes_t message_bytes;
+
+  for (i = 0; i < (int)sizeof(message); i++) {
+    message[i] = i & 0xff;
+  }
+
+  message_bytes.len = sizeof(message);
+  message_bytes.bytes = message;
+
+  for (i = 0; i < message_count; i++) {
+    uint64_t now = now_microseconds();
+
+    die_on_error(amqp_basic_publish(conn, 1, amqp_cstring_bytes("amq.direct"),
+                                    amqp_cstring_bytes(queue_name), 0, 0, NULL,
+                                    message_bytes),
+                 "Publishing");
+    sent++;
+    if (now > next_summary_time) {
+      int countOverInterval = sent - previous_sent;
+      double intervalRate =
+          countOverInterval / ((now - previous_report_time) / 1000000.0);
+      printf("%d ms: Sent %d - %d since last report (%d Hz)\n",
+             (int)(now - start_time) / 1000, sent, countOverInterval,
+             (int)intervalRate);
+
+      previous_sent = sent;
+      previous_report_time = now;
+      next_summary_time += SUMMARY_EVERY_US;
+    }
+
+    while (((i * 1000000.0) / (now - start_time)) > rate_limit) {
+      microsleep(2000);
+      now = now_microseconds();
+    }
+  }
+
+  {
+    uint64_t stop_time = now_microseconds();
+    int total_delta = (int)(stop_time - start_time);
+
+    printf("PRODUCER - Message count: %d\n", message_count);
+    printf("Total time, milliseconds: %d\n", total_delta / 1000);
+    printf("Overall messages-per-second: %g\n",
+           (message_count / (total_delta / 1000000.0)));
+  }
+}
+
+int main(int argc, char const *const *argv) {
+  char const *hostname;
+  int port, status;
+  int rate_limit;
+  int message_count;
+  amqp_socket_t *socket = NULL;
+  amqp_connection_state_t conn;
+
+  if (argc < 5) {
+    fprintf(stderr,
+            "Usage: amqp_producer host port rate_limit message_count\n");
+    return 1;
+  }
+
+  hostname = argv[1];
+  port = atoi(argv[2]);
+  rate_limit = atoi(argv[3]);
+  message_count = atoi(argv[4]);
+
+  conn = amqp_new_connection();
+
+  socket = amqp_tcp_socket_new(conn);
+  if (!socket) {
+    die("creating TCP socket");
+  }
+
+  status = amqp_socket_open(socket, hostname, port);
+  if (status) {
+    die("opening TCP socket");
+  }
+
+  die_on_amqp_error(amqp_login(conn, "/", 0, 131072, 0, AMQP_SASL_METHOD_PLAIN,
+                               "pi", "raspberry"),
+                    "Logging in");
+  amqp_channel_open(conn, 1);
+  die_on_amqp_error(amqp_get_rpc_reply(conn), "Opening channel");
+
+  send_batch(conn, "test queue", rate_limit, message_count);
+
+  die_on_amqp_error(amqp_channel_close(conn, 1, AMQP_REPLY_SUCCESS),
+                    "Closing channel");
+  die_on_amqp_error(amqp_connection_close(conn, AMQP_REPLY_SUCCESS),
+                    "Closing connection");
+  die_on_error(amqp_destroy_connection(conn), "Ending connection");
+  return 0;
+}
+

amqp/makefile

@@ -0,0 +1,16 @@
+# this make file uses two different libraries for the build.
+#   libmosquitto is the mosquitto MQTT library
+#      use sudo apt-get install libmosquitto-dev
+#      use sudo apt-get install mosquitto mosquitto-clients
+
+#   libfastjson is the Fast JSON library for JSON text handling
+#      use sudo apt-get install libfastjson-dev
+
+CFLAGS=-DWITH_POSIX
+
+client: client.c
+	cc $(CFLAGS) -o client client.c utils.c platform_utils.c -lrabbitmq -lfastjson -lsqlite3
+
+server: server.c
+	cc $(CFLAGS) -o server server.c utils.c platform_utils.c -lrabbitmq -lfastjson -lpthread -lwiringPi
+

amqp/platform_utils.c

@@ -0,0 +1,53 @@
+/*
+ * ***** BEGIN LICENSE BLOCK *****
+ * Version: MIT
+ *
+ * Portions created by Alan Antonuk are Copyright (c) 2012-2013
+ * Alan Antonuk. All Rights Reserved.
+ *
+ * Portions created by VMware are Copyright (c) 2007-2012 VMware, Inc.
+ * All Rights Reserved.
+ *
+ * Portions created by Tony Garnock-Jones are Copyright (c) 2009-2010
+ * VMware, Inc. and Tony Garnock-Jones. All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ * ***** END LICENSE BLOCK *****
+ */
+
+#include <stdint.h>
+#include <sys/time.h>
+#include <time.h>
+#include <unistd.h>
+
+uint64_t now_microseconds(void) {
+  struct timeval tv;
+  gettimeofday(&tv, NULL);
+  return (uint64_t)tv.tv_sec * 1000000 + (uint64_t)tv.tv_usec;
+}
+
+void microsleep(int usec) {
+  struct timespec req;
+  req.tv_sec = 0;
+  req.tv_nsec = 1000 * usec;
+  nanosleep(&req, NULL);
+}
+