/**
* Handles incoming data on a client connection.
* @param socket_server Socket server
* @param conn Client connection
*/
static void handle_connection(struct lwpb_transport_socket_server *socket_server,
struct lwpb_socket_server_conn *conn)
{
void *res_buf;
size_t res_len;
ssize_t len;
size_t used;
struct protocol_header_info info;
lwpb_err_t ret;
used = conn->pos - conn->buf;
len = recv(conn->socket, conn->pos, conn->len - used, 0);
if (len <= 0) {
close_connection(socket_server, conn);
return;
}
conn->pos += len;
used = conn->pos - conn->buf;
LWPB_DEBUG("Client(%d) received %d bytes", conn->index, len);
// Try to decode the request
ret = parse_request(conn->buf, used, &info, socket_server->server->service_list);
if (ret != PARSE_ERR_OK)
return;
LWPB_DEBUG("Client(%d) received request header", conn->index);
LWPB_DEBUG("type = %d, service = %p, method = %p, header_len = %d, msg_len = %d",
info.msg_type, info.service_desc, info.method_desc,
info.header_len, info.msg_len);
if (!info.service_desc) {
// TODO unknown service
}
if (!info.method_desc) {
// TODO unknown method
}
// Allocate response buffer
ret = lwpb_transport_alloc_buf(&socket_server->super, &res_buf, &res_len);
if (ret != LWPB_ERR_OK) {
// TODO handle memory error
}
ret = socket_server->server->call_handler(
socket_server->server, info.method_desc,
info.method_desc->req_desc,conn->buf + info.header_len, info.msg_len,
info.method_desc->res_desc, res_buf, &res_len,
socket_server->server->arg);
// Send response back to server
send_response(conn->socket, info.method_desc, res_buf, res_len);
lwpb_transport_free_buf(&socket_server->super, res_buf);
}
/**
* This method is called from the client to start an RPC call.
* @param transport Transport implementation
* @param client Client
* @param method_desc Method descriptor
* @return Returns LWPB_ERR_OK if successful.
*/
static lwpb_err_t transport_call(lwpb_transport_t transport,
struct lwpb_client *client,
const struct lwpb_method_desc *method_desc)
{
struct lwpb_transport_socket_client *socket_client =
(struct lwpb_transport_socket_client *) transport;
lwpb_err_t ret = LWPB_ERR_OK;
void *req_buf = NULL;
size_t req_len;
// Only continue if connected to server
if (socket_client->socket == -1) {
client->done_handler(client, method_desc,
LWPB_RPC_NOT_CONNECTED, client->arg);
goto out;
}
// Allocate a buffer for the request message
ret = lwpb_transport_alloc_buf(transport, &req_buf, &req_len);
if (ret != LWPB_ERR_OK)
goto out;
// Encode the request message
ret = client->request_handler(client, method_desc, method_desc->req_desc,
req_buf, &req_len, client->arg);
if (ret != LWPB_ERR_OK)
goto out;
socket_client->last_method = method_desc;
// Send the request to the server
// TODO check result
send_request(socket_client->socket, method_desc, req_buf, req_len);
out:
// Free allocated requiest message buffer
if (req_buf)
lwpb_transport_free_buf(transport, req_buf);
return ret;
}
/**
* Accepts new connections on the listen socket.
* @param socket_server Socket server
*/
static void handle_new_connection(struct lwpb_transport_socket_server *socket_server)
{
int socket;
struct sockaddr_storage addr;
socklen_t len = sizeof(addr);
char tmp[16];
struct sockaddr_in *addr_in;
int i;
const char msg[] = "No more connections allowed\n";
socket = accept(socket_server->socket, (struct sockaddr *) &addr, &len);
if (socket < 0) {
LWPB_ERR("Accepting new socket failed (errno: %d)", errno);
return;
}
make_nonblock(socket);
for (i = 0; i < LWPB_TRANSPORT_SOCKET_SERVER_CONNS; i++) {
struct lwpb_socket_server_conn *conn = &socket_server->conns[i];
if (conn->socket == -1) {
addr_in = (struct sockaddr_in *) &addr;
inet_ntop(addr.ss_family, &addr_in->sin_addr, tmp, sizeof(tmp));
LWPB_DEBUG("Client(%d) accepted conncetion from %s", conn->index, tmp);
conn->socket = socket;
if (!conn->buf)
lwpb_transport_alloc_buf(&socket_server->super, &conn->buf, &conn->len);
conn->pos = conn->buf;
socket_server->num_conns++;
return;
}
}
// No more connections allowed
LWPB_DEBUG("No more connections allowed");
send(socket, msg, sizeof(msg), 0);
close(socket);
}
/**
* This method is called from the client to start an RPC call.
* @param transport Transport implementation
* @param client Client
* @param method_desc Method descriptor
* @return Returns LWPB_ERR_OK if successful.
*/
static lwpb_err_t transport_call(lwpb_transport_t transport,
struct lwpb_client *client,
const struct lwpb_method_desc *method_desc)
{
struct lwpb_transport_socket_server *socket_server =
(struct lwpb_transport_socket_server *) transport;
lwpb_err_t ret = LWPB_ERR_OK;
void *req_buf = NULL;
size_t req_len;
void *res_buf = NULL;
size_t res_len;
// Allocate a buffer for the request message
ret = lwpb_transport_alloc_buf(transport, &req_buf, &req_len);
if (ret != LWPB_ERR_OK)
goto out;
// Allocate a buffer for the response message
ret = lwpb_transport_alloc_buf(transport, &res_buf, &res_len);
if (ret != LWPB_ERR_OK)
goto out;
// Encode the request message
ret = client->request_handler(client, method_desc, method_desc->req_desc,
req_buf, &req_len, client->arg);
if (ret != LWPB_ERR_OK)
goto out;
// We need a registered server to continue
if (!socket_server->server) {
client->done_handler(client, method_desc,
LWPB_RPC_NOT_CONNECTED, client->arg);
goto out;
}
// Process the call on the server
ret = socket_server->server->call_handler(socket_server->server, method_desc,
method_desc->req_desc, req_buf, req_len,
method_desc->res_desc, res_buf, &res_len,
socket_server->server->arg);
if (ret != LWPB_ERR_OK) {
client->done_handler(client, method_desc,
LWPB_RPC_FAILED, client->arg);
goto out;
}
// Process the response in the client
ret = client->response_handler(client, method_desc,
method_desc->res_desc, res_buf, res_len,
client->arg);
client->done_handler(client, method_desc, LWPB_RPC_OK, client->arg);
out:
// Free allocated message buffers
if (req_buf)
lwpb_transport_free_buf(transport, req_buf);
if (res_buf)
lwpb_transport_free_buf(transport, res_buf);
return ret;
}
/**
* Opens the socket client for communication.
* @param transport Transport handle
* @param host Hostname or IP address (using local address if NULL)
* @param port Port number for listen port
* @return Returns LWPB_ERR_OK if successful.
*/
lwpb_err_t lwpb_transport_socket_client_open(lwpb_transport_t transport,
const char *host, u16_t port)
{
struct lwpb_transport_socket_client *socket_client =
(struct lwpb_transport_socket_client *) transport;
lwpb_err_t ret = LWPB_ERR_OK;
int status;
struct addrinfo hints;
struct addrinfo *res;
struct sockaddr_in *addr;
char tmp[16];
int yes = 1;
if (socket_client->socket != -1) {
LWPB_INFO("Socket client already opened");
return LWPB_ERR_OK;
}
// Allocate receive buffer
ret = lwpb_transport_alloc_buf(&socket_client->super,
&socket_client->buf, &socket_client->len);
if (ret != LWPB_ERR_OK)
return ret;
socket_client->pos = socket_client->buf;
// Resolve hostname
LWPB_DEBUG("Resolving hostname '%s'", host);
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_INET; // IPv4
hints.ai_socktype = SOCK_STREAM; // TCP stream sockets
hints.ai_flags = AI_PASSIVE; // Fill in the IP
snprintf(tmp, sizeof(tmp), "%d", port);
if ((status = getaddrinfo(host, tmp, &hints, &res)) != 0) {
LWPB_ERR("getaddrinfo error: %s\n", gai_strerror(status));
ret = LWPB_ERR_NET_INIT;
goto out;
}
addr = (struct sockaddr_in *) res->ai_addr;
inet_ntop(res->ai_family, &addr->sin_addr, tmp, sizeof(tmp));
// Create client socket
LWPB_DEBUG("Creating client socket");
socket_client->socket = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (socket_client->socket == -1) {
LWPB_ERR("Cannot create client socket");
ret = LWPB_ERR_NET_INIT;
goto out;
}
// Reuse address if necessary
if (setsockopt(socket_client->socket, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) == -1) {
LWPB_ERR("Cannot set SO_REUSEADDR (error: %d)", errno);
ret = LWPB_ERR_NET_INIT;
goto out;
}
// Connect to server
LWPB_DEBUG("Connecting to %s:%d", tmp, port);
if (connect(socket_client->socket, res->ai_addr, res->ai_addrlen) == -1) {
LWPB_ERR("Cannot open connection (errno: %d)", errno);
ret = LWPB_ERR_NET_INIT;
goto out;
}
// Make non-blocking
make_nonblock(socket_client->socket);
out:
freeaddrinfo(res);
return ret;
}
