Fixed dequeue bug

Added memory leak tracking in debug

CMakeLists.txt

@@ -3,12 +3,14 @@ project(esc C)
 
 set(CMAKE_C_STANDARD 99)
 
+add_compile_options(-DDEBUG)
+
 if(WIN32)
     include_directories(c:/Users/nicol/dev/thirdparty/protobuf-c)
     link_directories(c:/Users/nicol/dev/thirdparty/protobuf-c/protobuf-c/.libs)
 endif()
 
-add_executable(esc src/main.c src/utils/mutex.c src/utils/mutex.h src/utils/thread.c src/utils/thread.h src/utils/socket.c src/utils/socket.h src/esc.c src/esc.h src/proto.c src/proto.h src/utils/uuid.c src/utils/uuid.h src/utils/buffer.c src/utils/buffer.h src/tcp_package.c src/tcp_package.h src/utils/string.c src/utils/string.h src/utils/queue.c src/utils/queue.h src/tcp_messages.c src/tcp_messages.h)
+add_executable(esc src/main.c src/utils/mutex.c src/utils/mutex.h src/utils/thread.c src/utils/thread.h src/utils/socket.c src/utils/socket.h src/esc.c src/esc.h src/proto.c src/proto.h src/utils/uuid.c src/utils/uuid.h src/utils/buffer.c src/utils/buffer.h src/tcp_package.c src/tcp_package.h src/utils/string.c src/utils/string.h src/utils/queue.c src/utils/queue.h src/tcp_messages.c src/tcp_messages.h src/utils/debug.h src/utils/debug.c)
 
 if(WIN32)
     target_link_libraries(esc wsock32 ws2_32 libprotobuf-c.a)

src/esc.c

@@ -7,6 +7,7 @@
 #include <string.h>
 #include <stdarg.h>
 #include "esc.h"
+#include "utils/debug.h"
 #include "utils/socket.h"
 #include "proto.h"
 #include "tcp_package.h"
@@ -238,32 +239,34 @@ void* connection_thread(void* arg) {
 
     while(conn->stop == BOOL_FALSE) {
         if (socket_writable(conn->tcp_conn)) {
-            printf("T1");
             tcp_package_t send_pkg = queue_dequeue(conn->send_queue);
-            printf("T1(%p)", send_pkg);
-            if (send_pkg && connection_send_tcp_package(conn, send_pkg)) {
-                fprintf(stderr, "failed to send pkg.");
+            if (send_pkg != 0) {
+                ssize_t rc = connection_send_tcp_package(conn, send_pkg);
+                if (rc == 0) {
+                    tcp_package_destroy(send_pkg);
+                } else {
+                    fprintf(stderr, "failed to send pkg.");
+                }
             }
-            printf("T2");
         }
 
         if (socket_readable(conn->tcp_conn)) {
-            printf("T3");
             tcp_package_t recv_pkg = connection_recv_tcp_package(conn);
-            printf("T4");
-            if (recv_pkg && recv_pkg->command == MESSAGE_HEARTBEATREQUEST) {
+            if (recv_pkg == 0) {
+                //TODO Handle connection lost
+                conn->stop = 1;
+            } else if (recv_pkg->command == MESSAGE_HEARTBEATREQUEST) {
                 tcp_package_t heartbeat_pkg = tcp_package_create(MESSAGE_HEARTBEATRESPONSE, recv_pkg->correlation_id, buffer_create(0));
-                printf("T5");
                 queue_enqueue(conn->send_queue, heartbeat_pkg);
-            } else if (recv_pkg) {
-                printf("T6");
+            } else {
                 queue_enqueue(conn->recv_queue, recv_pkg);
             }
-            printf("T7");
         }
 
         usleep(1);
     }
+
+    printf("manager thread stopping\n");
 }
 
 // return 0 on success
@@ -297,15 +300,18 @@ int esc_connection_connect(esc_connection_t conn) {
     uint8_t buffer[s];
     event_store__client__messages__identify_client__pack(&identify_client, buffer);
     // build tcp_package
-    tcp_package_t send_pkg = tcp_package_create(MESSAGE_IDENTIFYCLIENT, esc_uuid_create(), buffer_from(buffer, s));
+    esc_uuid_t correlation_id = esc_uuid_create();
+    tcp_package_t send_pkg = tcp_package_create(MESSAGE_IDENTIFYCLIENT, correlation_id, buffer_from(buffer, s));
     queue_enqueue(conn->send_queue, send_pkg);
 
-    tcp_package_t recv_pkg = connection_wait_for(conn, send_pkg->correlation_id);
+    tcp_package_t recv_pkg = connection_wait_for(conn, correlation_id);
     if (recv_pkg->command != MESSAGE_CLIENTIDENTIFIED) {
         conn->last_error = error_create(0, "server error: %d.", recv_pkg->command);
+        tcp_package_destroy(recv_pkg);
         return -1;
     }
 
+    tcp_package_destroy(recv_pkg);
 	return 0;
 }
 
@@ -351,22 +357,16 @@ esc_all_events_slice_t esc_connection_read_all_forward(esc_connection_t conn, co
     size_t s = event_store__client__messages__read_all_events__get_packed_size(&send_msg);
     uint8_t buffer[s];
     event_store__client__messages__read_all_events__pack(&send_msg, buffer);
-    printf("A %s\n", credentials->password);
-    tcp_package_t send_pkg = tcp_package_create_authenticated(MESSAGE_READALLEVENTSFORWARD, esc_uuid_create(), buffer_from(buffer, s), credentials->username, credentials->password);
-    printf("A1 %s %s\n", credentials->password, send_pkg->password);
+    esc_uuid_t correlation_id = esc_uuid_create();
+    tcp_package_t send_pkg = tcp_package_create_authenticated(MESSAGE_READALLEVENTSFORWARD, correlation_id, buffer_from(buffer, s), credentials->username, credentials->password);
     queue_enqueue(conn->send_queue, send_pkg);
-    printf("A2 %s %s\n", credentials->password, send_pkg->password);
 
-    printf("B %s\n", credentials->password);
-
-    tcp_package_t recv_pkg = connection_wait_for(conn, send_pkg->correlation_id);
+    tcp_package_t recv_pkg = connection_wait_for(conn, correlation_id);
     if (recv_pkg->command != MESSAGE_READALLEVENTSFORWARDCOMPLETED) {
         conn->last_error = error_create(recv_pkg->command, "server error: %s", get_string_for_tcp_message(recv_pkg->command));
         return 0;
     }
 
-    printf("C %s\n", credentials->password);
-
     //TODO function for unpacking from protobuf data to client struct
     size_t data_size = buffer_size(recv_pkg->data);
     uint8_t* data = buffer_data(recv_pkg->data);
@@ -388,12 +388,11 @@ esc_all_events_slice_t esc_connection_read_all_forward(esc_connection_t conn, co
     }
     event_store__client__messages__read_all_events_completed__free_unpacked(recv_msg, &conn->protobuf_c_allocator);
 
-    printf("D %s\n", credentials->password);
-
     return result;
 }
 
 void esc_connection_close(esc_connection_t conn) {
+    conn->stop = 1;
     socket_close(conn->tcp_conn);
 }
 

src/main.c

@@ -1,10 +1,12 @@
 #include <stdio.h>
+#include "utils/debug.h"
 #include "esc.h"
 
 #ifdef _WIN32
 #include <winsock.h>
 #include <windows.h>
 #define usleep Sleep
+#define sleep(x) Sleep(x*1000)
 #endif
 #ifdef __linux__
 #include <unistd.h>
@@ -53,10 +55,12 @@ int main() {
         }
     } while(result->is_end_of_stream == 0);
 	
-	usleep(30000);
+	sleep(10);
 
     esc_connection_close(conn);
 
+    dbg_list_allocs();
+
 #ifdef _WIN32
     WSACleanup();
 #endif

src/tcp_package.c

@@ -7,6 +7,7 @@
 #include <string.h>
 #include <stdio.h>
 #include "tcp_package.h"
+#include "utils/debug.h"
 #include "utils/string.h"
 
 const uint32_t CommandOffset = 0;

src/utils/buffer.c

@@ -4,6 +4,7 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include "debug.h"
 #include "buffer.h"
 
 struct st_buffer {

src/utils/debug.c

@@ -0,0 +1,52 @@
+//
+// Created by nicolas on 21/03/18.
+//
+
+#include <stdlib.h>
+#include <stdio.h>
+void* (*_malloc)(size_t) = malloc;
+void (*_free)(void*) = free;
+#include "debug.h"
+
+struct st_alloc {
+    const char* file;
+    int line;
+    size_t size;
+    void *ptr;
+};
+size_t _allocations_count = 0;
+size_t _allocations_size = 0;
+struct st_alloc* _allocations = 0;
+
+void* dbg_malloc(const char* file, int line, size_t size) {
+    if (_allocations_count == _allocations_size) {
+        _allocations = _allocations_size == 0 ? _malloc(1024*sizeof(struct st_alloc)) : realloc(_allocations, (_allocations_size + 1024)*sizeof(struct st_alloc));
+        _allocations_size += 1024;
+    }
+    void* ptr = _malloc(size);
+    struct st_alloc* alloc = &_allocations[_allocations_count++];
+    alloc->file = file;
+    alloc->line = line;
+    alloc->size = size;
+    alloc->ptr = ptr;
+    return ptr;
+}
+
+void dbg_free(void* ptr) {
+    for (size_t i = 0; i < _allocations_count; i++) {
+        if (_allocations[i].ptr == ptr) _allocations[i].ptr = 0;
+    }
+    _free(ptr);
+}
+
+
+void dbg_list_allocs() {
+    size_t total = 0;
+    printf("Memory leaks:\n");
+    for (size_t i = 0; i < _allocations_count; i++) {
+        if (_allocations[i].ptr == 0) continue;
+        printf("%lu %p (%lu) @ %s:%d\n", i, _allocations[i].ptr, _allocations[i].size, _allocations[i].file, _allocations[i].line);
+        total += _allocations[i].size;
+    }
+    printf("Total memory leaked: %lu\n", total);
+}

src/utils/debug.h

@@ -0,0 +1,19 @@
+//
+// Created by nicolas on 21/03/18.
+//
+
+#ifndef ESC_DEBUG_H
+#define ESC_DEBUG_H
+
+#include <stddef.h>
+#include <malloc.h>
+
+#ifdef DEBUG
+void* dbg_malloc(const char* file, int line, size_t size);
+void dbg_free(void* ptr);
+void dbg_list_allocs();
+#define malloc(s) dbg_malloc(__FILE__, __LINE__, s)
+#define free(p) dbg_free(p)
+#endif
+
+#endif //ESC_DEBUG_H

src/utils/mutex.c

@@ -7,6 +7,7 @@
 #endif
 
 #include <stdlib.h>
+#include "debug.h"
 #include "mutex.h"
 
 #ifdef _WIN32

src/utils/queue.c

@@ -5,6 +5,7 @@
 #include <stddef.h>
 #include <stdlib.h>
 #include <assert.h>
+#include "debug.h"
 #include "queue.h"
 #include "mutex.h"
 
@@ -56,6 +57,9 @@ void* queue_dequeue(queue_t q) {
     struct st_node* node = q->start;
     void* item = node->item;
     q->start = node->next;
+    if (q->end == node) {
+        q->end = 0;
+    }
     q->size--;
     mutex_unlock(q->lock);
     free(node);

src/utils/socket.c

@@ -4,6 +4,7 @@
 
 #include <stdlib.h>
 #include <unistd.h>
+#include "debug.h"
 #include "socket.h"
 
 #ifdef _WIN32

src/utils/string.c

@@ -4,6 +4,7 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include "debug.h"
 #include "string.h"
 
 const char* string_copy(const char *src) {

src/utils/thread.c

@@ -3,6 +3,7 @@
 //
 
 #include <stdlib.h>
+#include "debug.h"
 #include "thread.h"
 
 #ifdef _WIN32

src/utils/uuid.c

@@ -6,6 +6,7 @@
 #include <time.h>
 #include <stdio.h>
 #include <memory.h>
+#include "debug.h"
 #include "uuid.h"
 
 #define UUID_SIZE 16