Added multithreaded server02 for handling query and insert requests, utility functions for byte operations in data.c, updated tests, and extended project configuration.

.idea/dictionaries/project.xml

@@ -0,0 +1,7 @@
+<component name="ProjectDictionaryState">
+  <dictionary name="project">
+    <words>
+      <w>mintime</w>
+    </words>
+  </dictionary>
+</component>

CMakeLists.txt

@@ -22,3 +22,7 @@ add_executable(server01 server01.c
         ${COMMON_SOURCES})
 
 target_link_libraries(server01 PRIVATE wsock32 ws2_32 json-c::json-c)
+
+
+add_executable(server02 server02.c server02.h ${COMMON_SOURCES})
+target_link_libraries(server02 wsock32 ws2_32)

data.c

@@ -10,9 +10,7 @@
 SOCKET get_listen_socket() {
     WSADATA WSAData;
 
-    SOCKET client;
+    SOCKADDR_IN serverAddr;
-
-    SOCKADDR_IN serverAddr, clientAddr;
 
     WSAStartup(MAKEWORD(2,0), &WSAData);
     SOCKET server = socket(AF_INET, SOCK_STREAM, 0);
@@ -89,13 +87,27 @@ char *char_array_get_until_char(char_array_t *array, char c) {
     char *ret = malloc(idx+1);
     memcpy(ret, array->data, idx);
     ret[idx] = '\0';
-    char *temp = calloc(array->capacity, sizeof(char));
+    char_array_shift_bytes(array, idx+1);
-    size_t new_i = 0;
-    for (size_t i = idx+1; i < array->size; i++) {
-        temp[new_i++] = array->data[i];
-    }
-    free(array->data);
-    array->data = temp;
-    array->size = new_i;
     return ret;
 };
+
+char *char_array_get_bytes(char_array_t *array, size_t length) {
+    if (length < array->size) {
+        return NULL;
+    }
+
+    char *ret = malloc(length);
+    memcpy(ret, array->data, length);
+    char_array_shift_bytes(array, length);
+    return ret;
+}
+void char_array_shift_bytes(char_array_t *array, size_t length) {
+    if (length >= array->size) {
+        array->size = 0;
+        return;
+    }
+
+    memmove(array->data, array->data + length, array->size - length);
+    array->size -= length;
+
+}

data.h

@@ -14,5 +14,7 @@ void char_array_print(const char_array_t *array);
 void char_array_wipe(char_array_t *array);
 bool char_array_has_char(char_array_t *array, char c);
 char *char_array_get_until_char(char_array_t *array, char c);
+char *char_array_get_bytes(char_array_t *array, size_t length);
+void char_array_shift_bytes(char_array_t *array, size_t length);
 
 SOCKET get_listen_socket();

server01.c

@@ -49,6 +49,7 @@ void *handle_connection(void *args) {
         }
         memset(buffer, 0, sizeof(buffer));
     }
+    closesocket(handleArgs->client);
     free(handleArgs);
     pthread_exit(NULL);
 }

server02.c

@@ -0,0 +1,127 @@
+//
+// Created by Ajurna on 28/07/2025.
+//
+
+#include "server02.h"
+#include <winsock2.h>
+#include <stdio.h>
+#include "data.h"
+#include <pthread.h>
+
+int main() {
+    SOCKET server = get_listen_socket();
+    SOCKADDR_IN clientAddr;
+    SOCKET client;
+    int clientAddrSize = sizeof(clientAddr);
+    int connection_number = 1;
+    printf("Listening for incoming connections...\n");
+    while((client = accept(server, (SOCKADDR *)&clientAddr, &clientAddrSize)) != INVALID_SOCKET)
+    {
+        handle_args_t *args = malloc(sizeof(handle_args_t));
+        args->client = client;
+        args->connection = connection_number++;
+        pthread_t thread;
+        pthread_create(&thread, nullptr, handle_connection, args);
+    }
+    return 0;
+}
+void *handle_connection(void *args) {
+    handle_args_t *handleArgs = args;
+    char buffer[1024] = {0};
+    int bytesReceived;
+    char_array_t *data = char_array_create(1024);
+    price_array_t *prices = price_array_create(1024);
+    while ((bytesReceived = recv(handleArgs->client, buffer, sizeof(buffer), 0)) > 0) {
+        printf("Client sent {%d}: |%d| \n", handleArgs->connection, bytesReceived);
+        char_array_append(data, buffer, bytesReceived);
+        query_or_insert_t *request;
+        while ((request = fix_message(char_array_get_bytes(data, 9))) != NULL) {
+            //parse_request(handleArgs, request, data);
+            switch (request->insert.type) {
+                case INSERT:
+                    printf("{%d} timestamp: %d, price: %d\n", handleArgs->connection, request->insert.timestamp, request->insert.price);
+                    price_array_append(prices, &request->insert);
+                    break;
+                case QUERY:
+                    printf("{%d} Query min: %d, max: %d\n", handleArgs->connection, request->query.mintime, request->query.maxtime);
+                    int average = price_array_query(prices, &request->query);
+                    printf("{%d} Query min: %d, max: %d avg %d\n", handleArgs->connection, request->query.mintime, request->query.maxtime, average);
+                    int32_t response = htonl(average);
+                    send(handleArgs->client, (char*)&response, sizeof(response), 0);
+                default:
+                    closesocket(handleArgs->client);
+                    free(handleArgs);
+                    pthread_exit(NULL);
+                    exit(3);
+            }
+            // free(request);
+        }
+        memset(buffer, 0, sizeof(buffer));
+    }
+
+    closesocket(handleArgs->client);
+    free(handleArgs);
+    pthread_exit(NULL);
+}
+
+query_or_insert_t *fix_message(char *message) {
+    if (message == NULL) {
+        return NULL;
+    }
+    query_or_insert_t *ret = malloc(sizeof(query_or_insert_t));
+    ret->insert.type = message[0];
+    ret->query.mintime = message[4] | (message[3] << 8) | (message[2] << 16) | (message[1] << 24);
+    ret->query.maxtime = message[8] | (message[7] << 8) | (message[6] << 16) | (message[5] << 24);
+    return ret;
+}
+
+price_array_t *price_array_create(int capacity) {
+    price_array_t *array = malloc(sizeof(price_array_t));
+    array->capacity = capacity;
+    array->size = 0;
+    array->data = calloc(capacity, sizeof(price_t));
+    return array;
+};
+void price_array_free(price_array_t *array) {
+    free(array->data);
+    free(array);
+};
+void price_array_append(price_array_t *array, insert_t *value) {
+    if (array->data == NULL) {
+        exit(1);
+    }
+    size_t new_size = array->size + 1;
+    if (new_size > array->capacity) {
+        array->capacity = array->capacity+1024;
+        price_t *new_array = realloc(array->data, array->capacity);
+        array->data = new_array;
+        if (array->data == NULL) {
+            printf("Failed to allocate memory for array\n");
+            exit(1);
+        }
+    }
+    price_t *temp = malloc(sizeof(price_t));
+    temp->timestamp = value->timestamp;
+    temp->price = value->price;
+    array->data[array->size] = *temp;
+    array->size = new_size;
+};
+int price_array_query(price_array_t *array, query_t *query) {
+
+    int count = 0;
+    int total = 0;
+    for (int i = 0; i < array->size; i++) {
+        if (array->data[i].timestamp >= query->mintime && array->data[i].timestamp <= query->maxtime) {
+            count++;
+            total += array->data[i].price;
+        }
+    }
+    printf("{%d} Found %d prices\n", query->mintime, count);
+    int ret;
+    if (count == 0) {
+        ret = 0;
+    } else {
+        ret = total/count;
+    }
+    return ret;
+};

server02.h

@@ -0,0 +1,56 @@
+//
+// Created by Ajurna on 28/07/2025.
+//
+
+#ifndef SERVER02_H
+#define SERVER02_H
+#include <stdint.h>
+
+#endif //SERVER02_H
+
+#include <winsock2.h>
+typedef struct handleArgs {
+    int connection;
+    SOCKET client;
+} handle_args_t;
+
+typedef enum MessageType {
+    QUERY = 'Q',
+    INSERT = 'I'
+} message_type_t;
+
+typedef struct Insert {
+    char type;
+    int32_t timestamp;
+    int32_t price;
+} insert_t;
+
+typedef struct Query {
+    char type;
+    int32_t mintime;
+    int32_t maxtime;
+} query_t;
+
+typedef union QueryOrInsert {
+    query_t query;
+    insert_t insert;
+} query_or_insert_t;
+
+typedef struct Price {
+    int32_t timestamp;
+    int32_t price;
+} price_t;
+
+typedef struct PriceArray {
+    size_t size;
+    size_t capacity;
+    price_t *data;
+} price_array_t;
+
+void *handle_connection(void *args);
+query_or_insert_t *fix_message(char *message);
+
+price_array_t *price_array_create(int capacity);
+void price_array_free(price_array_t *array);
+void price_array_append(price_array_t *array, insert_t *value);
+int price_array_query(price_array_t *array, query_t *query);

server02_socket_communication_test.py

@@ -0,0 +1,66 @@
+import socket
+import struct
+from time import sleep
+
+def create_insert_message(timestamp: int, price: int) -> bytes:
+    """Create a 9-byte insert message."""
+    return struct.pack('!cii', b'I', timestamp, price)
+
+def create_query_message(mintime: int, maxtime: int) -> bytes:
+    """Create a 9-byte query message."""
+    return struct.pack('!cii', b'Q', mintime, maxtime)
+
+def receive_response(sock: socket.socket) -> int:
+    """Receive and decode a 4-byte response."""
+    data = sock.recv(4)
+    return struct.unpack('!i', data)[0]
+
+def run_test():
+    # Connect to the server
+    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    sock.connect(('localhost', 40000))  # Using the same port as your other servers
+    
+    # Test case 1: Insert some values
+    test_data = [
+        (12345, 101),  # (timestamp, price)
+        (12346, 102),
+        (12347, 100),
+        (40960, 5),
+    ]
+    
+    print("Inserting test data...")
+    for timestamp, price in test_data:
+        message = create_insert_message(timestamp, price)
+        sock.send(message)
+        print(f"Inserted: timestamp={timestamp}, price={price}")
+        sleep(0.1)  # Small delay to avoid overwhelming the server
+    
+    # Test case 2: Query for mean price
+    mintime = 12288
+    maxtime = 16384
+    print(f"\nQuerying mean price between {mintime} and {maxtime}...")
+    
+    query = create_query_message(mintime, maxtime)
+    sock.send(query)
+    
+    # Get response
+    mean_price = receive_response(sock)
+    print(f"Received mean price: {mean_price}")
+    
+    # Test case 3: Query with no data in range
+    print("\nTesting query with no data in range...")
+    query = create_query_message(1, 1000)
+    sock.send(query)
+    mean_price = receive_response(sock)
+    print(f"Received mean price (should be 0): {mean_price}")
+    
+    # Clean up
+    sock.close()
+
+if __name__ == "__main__":
+    try:
+        run_test()
+    except ConnectionRefusedError:
+        print("Could not connect to server. Make sure it's running on port 40000.")
+    except Exception as e:
+        print(f"An error occurred: {e}")