From 06c78fe0e2e4e7f0a5ba791571e1986a2e0dab42 Mon Sep 17 00:00:00 2001
From: Trygve Laugstøl <trygvis@inamo.no>
Date: Sun, 2 Aug 2015 16:27:10 +0200
Subject: o Adding a MQTT consumer that stores the parsed record in Cassandra.

---
 sm-mqtt-consumer.cpp | 78 ++++++++++++++--------------------------------------
 1 file changed, 20 insertions(+), 58 deletions(-)

(limited to 'sm-mqtt-consumer.cpp')

diff --git a/sm-mqtt-consumer.cpp b/sm-mqtt-consumer.cpp
index e1f6801..b91b663 100644
--- a/sm-mqtt-consumer.cpp
+++ b/sm-mqtt-consumer.cpp
@@ -1,15 +1,19 @@
 #include "cassandra_support.h"
-#include "mosquittopp.h"
-#include "trygvis/sensor/io.h"
+#include "mqtt_support.h"
+#include "misc_support.h"
 #include <thread>
-#include <boost/lexical_cast.hpp>
 #include <boost/program_options.hpp>
+#include <trygvis/sensor/io.h>
+
+namespace sm_mqtt_consumer {
 
 using namespace std;
 using namespace std::chrono;
 using namespace trygvis::sensor;
 using namespace trygvis::sensor::io;
 using namespace trygvis::cassandra_support;
+using namespace trygvis::mqtt_support;
+using namespace trygvis::misc_support;
 using namespace boost;
 namespace po = boost::program_options;
 
@@ -53,29 +57,12 @@ struct device_measurement {
     }
 };
 
-string &&to_string(CassFuture *f) {
-    const char *message;
-    size_t message_length;
-    cass_future_error_message(f, &message, &message_length);
-
-    return std::move(string(message, message_length));
-}
-
-class mqtt_lib {
-public:
-    mqtt_lib() {
-        mosquitto_lib_init();
-    }
-
-    ~mqtt_lib() {
-        mosquitto_lib_cleanup();
-    }
-};
-
 class mqtt_client : private mosqpp::mosquittopp {
 public:
-    mqtt_client(std::function<void(const struct mosquitto_message *)> on_message_) : mosquittopp(),
-                                                                                     on_message_(on_message_) {
+    typedef std::function<void(const struct mosquitto_message *)> callback_t;
+
+    mqtt_client(callback_t on_message_) : mosquittopp(),
+                                          on_message_(on_message_) {
         cout << "Connecting to " << mqtt_broker_host << ":" << mqtt_broker_port << endl;
         loop_start();
         connect_async(mqtt_broker_host.c_str(), mqtt_broker_port, 10);
@@ -87,7 +74,7 @@ public:
     }
 
 private:
-    std::function<void(const struct mosquitto_message *)> on_message_;
+    callback_t on_message_;
     bool subscribed = false;
 
     void on_connect(int rc) override {
@@ -132,10 +119,6 @@ private:
     }
 };
 
-void print_error(CassFuture *future) {
-    cout << "Cassandra error: " << error_message(future) << endl;
-}
-
 auto insert_into_sm_by_day(CassSession *session, device_measurement &&measurement) {
     cassandra_statement q("INSERT INTO sm_by_day(device, day, timestamp, sensors) VALUES (?, ?, ?, ?);", 4);
 
@@ -161,33 +144,6 @@ auto insert_into_sm_by_day(CassSession *session, device_measurement &&measuremen
     return cass_session_execute(session, q);
 }
 
-template<typename Target, typename Source>
-boost::optional<Target> map(boost::optional<Source> &a, std::function<Target(Source)> f) {
-    if (!a.is_initialized()) {
-        return boost::none;
-    }
-
-    return make_optional(f(a));
-}
-
-template<typename Target, typename Source>
-boost::optional<Target> flat_map(boost::optional<Source> &a, boost::optional<Target> (&f)(Source)) {
-    if (!a.is_initialized()) {
-        return boost::none;
-    }
-
-    return f(a.get());
-}
-
-template<typename Target, typename Source = string>
-boost::optional<Target> l_c(const Source source) {
-    try {
-        return boost::lexical_cast<Target>(source);
-    } catch (bad_lexical_cast &e) {
-        return boost::none;
-    }
-};
-
 void on_message(const struct mosquitto_message *message) {
     string payload((const char *) message->payload, (size_t) message->payloadlen);
     cout << "storing message: " << endl;
@@ -255,7 +211,7 @@ void on_message(const struct mosquitto_message *message) {
             handle_future(insert_into_sm_by_day((CassSession*) current_cassandra_session.get(), std::move(measurement)), [&](auto future) {
                 cout << "Success!" << endl;
             }, [&](auto future, auto err) {
-                cout << "Failure: " << error_message(future) << endl;
+                cout << "Failure: " << cassandra_future::error_message(future) << endl;
             });
         } else {
             cout << "Not connected to Cassandra" << endl;
@@ -306,7 +262,7 @@ int main(int argc, const char **argv) {
     connect_future = cass_session_connect((CassSession*) session.get(), cluster);
 
     if (cass_future_error_code(connect_future) != CASS_OK) {
-        string s = to_string(connect_future);
+        string s = cassandra_future::error_message(connect_future);
         cerr << "Could not connect to Cassandra:" << s << endl;
         return EXIT_FAILURE;
     }
@@ -326,3 +282,9 @@ int main(int argc, const char **argv) {
 
     return 0;
 }
+
+}
+
+int main(int argc, const char **argv) {
+    return sm_mqtt_consumer::main(argc, argv);
+}
-- 
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