1 files changed, 152 insertions, 0 deletions
diff --git a/src/client/client.cpp b/src/client/client.cpp
new file mode 100644
index 0000000..cbaddeb
--- /dev/null
+++ b/src/client/client.cpp
@@ -0,0 +1,152 @@
+#include "client.h"
+#include "shared_memory.h"
+#include <optional>
+
+Client::Client()
+{
+    shm_fd = shm_open(SHM_NAME, O_RDWR, 0666);
+    if (shm_fd == -1) {
+        std::cout << "Server not running" << '\n';
+        exit(-1);
+    }
+
+    shared_memory =
+        (SharedMemory*)mmap(0, sizeof(SharedMemory), PROT_READ | PROT_WRITE, MAP_SHARED, shm_fd, 0);
+}
+
+Client::~Client()
+{
+    munmap(shared_memory, sizeof(SharedMemory));
+    close(shm_fd);
+}
+
+void Client::start_client()
+{
+    while (true) {
+        char operation;
+        int k, v;
+        int index = -1;
+        std::cout << "Choose the operation (i: Insert, g: Get, r: Remove, p: Print, e: Exit)"
+                  << '\n';
+        std::cin >> operation;
+
+        switch (operation) {
+        case 'e':
+            return;
+
+        case 'i':
+            std::cout << "Insert: Enter the k-v pair(<int> <int>):" << '\n';
+            if (!(std::cin >> k >> v)) {
+                std::cout << "Invalid input" << '\n';
+                std::cin.clear();
+                std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
+                break;
+            };
+            index = send_request(
+                shared_memory, INSERT, std::optional(serialize(k)), std::optional(serialize(v)));
+            break;
+
+        case 'g': {
+            std::cout << "Get: Enter the key(<int>):" << '\n';
+            if (!(std::cin >> k)) {
+                std::cout << "Invalid input" << '\n';
+                std::cin.clear();
+                std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
+                break;
+            };
+            index = send_request(shared_memory, GET, std::optional(serialize(k)), std::nullopt);
+            break;
+        }
+
+        case 'r':
+            std::cout << "Remove: Enter key(<int>):" << '\n';
+            if (!(std::cin >> k)) {
+                std::cout << "Invalid input" << '\n';
+                std::cin.clear();
+                std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
+                break;
+            };
+            index = send_request(shared_memory, DELETE, std::optional(serialize(k)), std::nullopt);
+            break;
+
+        case 'p':
+            index = send_request(shared_memory, PRINT, std::nullopt, std::nullopt);
+            break;
+
+        default:
+            break;
+        }
+
+        if (index != -1) {
+            std::string response = process_respond(shared_memory, index);
+            std::cout << response << '\n';
+        }
+        std::cout << '\n';
+    }
+}
+
+bool Client::request_processed(SharedMemory* shared_memory, int index)
+{
+    if (index >= QUEUE_SIZE || index < 0) {
+        return false;
+    }
+
+    if (shared_memory->full) {
+        return false;
+    }
+    if (shared_memory->tail == shared_memory->head && !shared_memory->full) {
+        return true;
+    }
+
+    for (int i = shared_memory->head - 1; i != shared_memory->tail; i = (i - 1) % QUEUE_SIZE) {
+        if (i == index) {
+            return false;
+        }
+    }
+
+    return shared_memory->tail != index;
+}
+
+int Client::send_request(
+    SharedMemory* shared_memory,
+    Operations type,
+    std::optional<const std::string> k,
+    std::optional<const std::string> v)
+{
+    int index;
+
+    pthread_mutex_lock(&shared_memory->mutex);
+
+    while (shared_memory->full) {
+        pthread_cond_wait(&shared_memory->cond_var, &shared_memory->mutex);
+    }
+
+    index = shared_memory->head;
+    Request* request = &shared_memory->request[index];
+    request->type = type;
+    strncpy(request->key, k.value_or("null").c_str(), MAX_KEY_SIZE);
+    strncpy(request->value, v.value_or("null").c_str(), MAX_VALUE_SIZE);
+    shared_memory->head = (1 + shared_memory->head) % QUEUE_SIZE;
+    shared_memory->full = shared_memory->head == shared_memory->tail;
+    pthread_cond_signal(&shared_memory->cond_var);
+
+    pthread_mutex_unlock(&shared_memory->mutex);
+
+    return index;
+}
+
+std::string Client::process_respond(SharedMemory* shared_memory, int index)
+{
+    if (index >= QUEUE_SIZE || index < 0) {
+        return std::string();
+    }
+
+    pthread_mutex_lock(&shared_memory->mutex);
+
+    while (!request_processed(shared_memory, index)) {
+        pthread_cond_wait(&shared_memory->cond_var, &shared_memory->mutex);
+    }
+    std::string result(shared_memory->request[index].response);
+    pthread_mutex_unlock(&shared_memory->mutex);
+    return result;
+}