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/* PipeWire AGL Cluster IPC
*
* Copyright © 2021 Collabora Ltd.
* @author Julian Bouzas <julian.bouzas@collabora.com>
*
* SPDX-License-Identifier: MIT
*/
#include <pthread.h>
#include <string.h>
#include <alloca.h>
#include "private.h"
#include "protocol.h"
#include "receiver.h"
#include "server.h"
#define BUFFER_SIZE 1024
#define MAX_REQUEST_HANDLERS 128
typedef struct ClientHandler {
icipc_server_client_handler_func_t handler;
void *data;
} ClientHandler;
typedef struct RequestHandler {
const char *name;
icipc_server_request_handler_func_t handler;
void *data;
} RequestHandler;
typedef struct ServerPriv {
pthread_mutex_t mutex;
ClientHandler client_handler;
size_t n_request_handlers;
RequestHandler request_handlers[MAX_REQUEST_HANDLERS];
} ServerPriv;
static void sender_state(
struct icipc_receiver *base,
int sender_fd,
enum icipc_receiver_sender_state sender_state,
void *data) {
ServerPriv *priv = icipc_receiver_get_user_data(base);
icipc_log_info("server: new state %d on client %d", sender_state,
sender_fd);
pthread_mutex_lock(&priv->mutex);
if (priv->client_handler.handler)
priv->client_handler.handler((struct icipc_server *)base,
sender_fd, sender_state,
priv->client_handler.data);
pthread_mutex_unlock(&priv->mutex);
}
static bool handle_message(
struct icipc_receiver *base,
int sender_fd,
const uint8_t * buffer,
size_t size,
void *data) {
ServerPriv *priv = icipc_receiver_get_user_data(base);
const char *name = NULL;
const struct icipc_data *args = NULL;
icipc_log_info("server: message from client %d received", sender_fd);
/* parse */
if (!icipc_protocol_parse_request(buffer, size, &name, &args)) {
const char *msg = "could not parse request";
const size_t s = icipc_protocol_calculate_reply_error_size(msg);
uint8_t *b = alloca(s);
icipc_protocol_build_reply_error(b, s, msg);
return icipc_socket_write(sender_fd, b, s) == (ssize_t) s;
}
/* handle */
size_t i;
bool res = false;
pthread_mutex_lock(&priv->mutex);
for (i = 0; i < MAX_REQUEST_HANDLERS; i++) {
RequestHandler *rh = priv->request_handlers + i;
if (rh->name != NULL && strcmp(rh->name, name) == 0
&& rh->handler != NULL) {
res =
rh->handler((struct icipc_server *)base, sender_fd,
name, args, rh->data);
pthread_mutex_unlock(&priv->mutex);
return res;
}
}
/* handler was not found, reply with error */
res = icipc_server_reply_error((struct icipc_server *)base, sender_fd,
"request handler not found");
pthread_mutex_unlock(&priv->mutex);
return res;
}
static struct icipc_receiver_events events = {
.sender_state = sender_state,
.handle_message = handle_message,
};
/* API */
struct icipc_server *icipc_server_new(const char *path, bool start) {
ServerPriv *priv = NULL;
struct icipc_receiver *base = NULL;
base = icipc_receiver_new(path, BUFFER_SIZE, &events, NULL,
sizeof(ServerPriv));
if (base == NULL)
return NULL;
priv = icipc_receiver_get_user_data(base);
pthread_mutex_init(&priv->mutex, NULL);
priv->n_request_handlers = 0;
if (start && !icipc_receiver_start(base)) {
icipc_log_error("failed to start receiver");
icipc_server_free((struct icipc_server *)base);
return NULL;
}
return (struct icipc_server *)base;
}
void icipc_server_free(struct icipc_server *self) {
struct icipc_receiver *base = icipc_server_to_receiver(self);
ServerPriv *priv = icipc_receiver_get_user_data(base);
pthread_mutex_destroy(&priv->mutex);
icipc_receiver_free(base);
}
void icipc_server_set_client_handler(
struct icipc_server *self,
icipc_server_client_handler_func_t handler,
void *data) {
struct icipc_receiver *base = icipc_server_to_receiver(self);
ServerPriv *priv = icipc_receiver_get_user_data(base);
pthread_mutex_lock(&priv->mutex);
priv->client_handler.handler = handler;
priv->client_handler.data = data;
pthread_mutex_unlock(&priv->mutex);
}
void icipc_server_clear_client_handler(struct icipc_server *self) {
struct icipc_receiver *base = icipc_server_to_receiver(self);
ServerPriv *priv = icipc_receiver_get_user_data(base);
pthread_mutex_lock(&priv->mutex);
priv->client_handler.handler = NULL;
priv->client_handler.data = NULL;
pthread_mutex_unlock(&priv->mutex);
}
bool icipc_server_set_request_handler(
struct icipc_server *self,
const char *name,
icipc_server_request_handler_func_t handler,
void *data) {
struct icipc_receiver *base = icipc_server_to_receiver(self);
ServerPriv *priv = icipc_receiver_get_user_data(base);
size_t i;
/* check params */
if (name == NULL)
return false;
pthread_mutex_lock(&priv->mutex);
/* make sure handler does not exist */
for (i = 0; i < MAX_REQUEST_HANDLERS; i++) {
RequestHandler *rh =
priv->request_handlers + i;
if (rh->name != NULL && strcmp(rh->name, name) == 0) {
pthread_mutex_unlock(&priv->mutex);
return false;
}
}
/* set handler */
for (i = 0; i < MAX_REQUEST_HANDLERS; i++) {
RequestHandler *rh =
priv->request_handlers + i;
if (rh->name == NULL) {
rh->name = name;
rh->handler = handler;
rh->data = data;
pthread_mutex_unlock(&priv->mutex);
return true;
}
}
pthread_mutex_unlock(&priv->mutex);
return false;
}
void icipc_server_clear_request_handler(
struct icipc_server *self,
const char *name) {
struct icipc_receiver *base = icipc_server_to_receiver(self);
ServerPriv *priv = icipc_receiver_get_user_data(base);
size_t i;
/* check params */
if (name == NULL)
return;
pthread_mutex_lock(&priv->mutex);
/* clear handler */
for (i = 0; i < MAX_REQUEST_HANDLERS; i++) {
RequestHandler *rh =
priv->request_handlers + i;
if (rh->name != NULL && strcmp(rh->name, name) == 0) {
rh->name = NULL;
break;
}
}
pthread_mutex_unlock(&priv->mutex);
}
bool icipc_server_reply_ok(
struct icipc_server *self,
int client_fd,
const struct icipc_data *value) {
const size_t s = icipc_protocol_calculate_reply_ok_size(value);
uint8_t *b = alloca(s);
icipc_protocol_build_reply_ok(b, s, value);
return icipc_socket_write(client_fd, b, s) == (ssize_t) s;
}
bool icipc_server_reply_error(
struct icipc_server *self,
int client_fd,
const char *msg) {
if (msg == NULL)
return false;
const size_t s = icipc_protocol_calculate_reply_error_size(msg);
uint8_t *b = alloca(s);
icipc_protocol_build_reply_error(b, s, msg);
return icipc_socket_write(client_fd, b, s) == (ssize_t) s;
}
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