From 934df81c5296f61b6b4cbc5e9fd25c98cdd5993e Mon Sep 17 00:00:00 2001
From: Mikhail Burakov <mburakov@mailbox.org>
Date: Fri, 6 Jan 2023 13:39:24 +0100
Subject: Preserve mqtt messages in service context

---
 main.c | 45 +++++++++++++++++++++++++++++++++++++++------
 1 file changed, 39 insertions(+), 6 deletions(-)

(limited to 'main.c')

diff --git a/main.c b/main.c
index 7f1b8d5..d5d75fc 100644
--- a/main.c
+++ b/main.c
@@ -22,6 +22,7 @@
 //#include <search.h>
 #include <arpa/inet.h>
 #include <netinet/in.h>
+#include <search.h>
 #include <signal.h>
 #include <stdbool.h>
 #include <stdint.h>
@@ -30,6 +31,7 @@
 #include <sys/socket.h>
 #include <unistd.h>
 
+#include "message.h"
 #include "toolbox/buffer.h"
 #include "toolbox/http_parser.h"
 #include "toolbox/io_muxer.h"
@@ -53,6 +55,7 @@ struct ServiceContext {
   struct IoMuxer io_muxer;
   struct Buffer mqtt_buffer;
   struct ClientContext* clients;
+  void* messages;
 };
 
 static volatile sig_atomic_t g_signal;
@@ -105,8 +108,8 @@ static void DropClientContext(struct ClientContext* client) {
   *next = client->next;
 
   BufferDestroy(&client->http_buffer);
-  if (client->target) free(client->target);
-  if (client->method) free(client->method);
+  free(client->target);
+  free(client->method);
   close(client->sock);
   free(client);
 }
@@ -293,7 +296,37 @@ static void OnMqttPublish(void* user, const char* topic, size_t topic_size,
   (void)user;
   LOGD("%.*s <- %.*s", (int)topic_size, topic, (int)payload_size,
        (const char*)payload);
-  // TODO(mburakov): Implement me!
+  void* payload_copy = malloc(payload_size);
+  if (!payload_copy) {
+    LOGW("Failed to copy payload (%s)", strerror(errno));
+    return;
+  }
+  struct Message key = {
+      .topic = *(void**)(void*)(&topic),
+      .topic_size = topic_size,
+  };
+  struct Message** node = tsearch(&key, &g_service.messages, MessageCompare);
+  if (!node) {
+    LOGW("Failed to create message node (%s)", strerror(errno));
+    goto free_payload;
+  }
+  if (*node == &key) {
+    struct Message* message = MessageCreate(topic, topic_size);
+    if (!message) {
+      LOGW("Failed to create message (%s)", strerror(errno));
+      goto delete_node;
+    }
+    *node = message;
+  }
+  free((*node)->payload);
+  (*node)->payload = payload_copy;
+  (*node)->payload_size = payload_size;
+  return;
+
+delete_node:
+  tdelete(&key, &g_service.messages, MessageCompare);
+free_payload:
+  free(payload_copy);
 }
 
 static void OnMqttFinished(void* user, size_t offset) {
@@ -408,9 +441,9 @@ int main(int argc, char* argv[]) {
       OnSignal(SIGABRT);
     }
   }
-  while (g_service.clients) {
-    DropClientContext(g_service.clients);
-  }
+  tdestroy(g_service.messages, MessageDestroy);
+  while (g_service.clients) DropClientContext(g_service.clients);
+  BufferDestroy(&g_service.mqtt_buffer);
 
 destroy_iomuxer:
   IoMuxerDestroy(&g_service.io_muxer);
-- 
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