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rpc.c
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/**
* @file rpc.c
* RPC implementation for Apteryx.
*
* Copyright 2015, Allied Telesis Labs New Zealand, Ltd
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>
*/
#include "internal.h"
/* An RPC instance.
* Provides the service, service
* Connects to the remote service using the descriptor
*/
struct rpc_instance_s {
/* Protect the instance */
pthread_mutex_t lock;
/* General settings */
int timeout;
bool reuse_sock;
uint64_t gc_time;
/* Single service */
rpc_msg_handler handler;
rpc_service server;
/* Fast workers */
sigset_t worker_sigmask;
GThreadPool *workers;
/* Slow worker and background task thread */
GMainContext *slow_context;
GMainLoop *slow_loop;
GThread *slow_thread;
int slow_count;
/* Single threaded mode handler */
int pollfd[2];
GAsyncQueue *queue;
uint32_t overflow;
/* Clients */
GHashTable *clients;
};
#include "apteryx.h"
/* Garbage collection timer */
#define RPC_GC_TIMEOUT_US (10 * RPC_TIMEOUT_US)
/* Force test delay */
bool rpc_test_random_watch_delay = false;
/* Client object */
typedef struct rpc_client_t
{
rpc_socket sock;
uint32_t refcount;
char *url;
uint64_t timeout;
int pid;
} rpc_client_t;
/* Message header */
#define RPC_HEADER_LENGTH (2 * sizeof (uint32_t))
/* Server work */
struct rpc_work_s {
rpc_instance rpc;
rpc_socket sock;
rpc_id id;
rpc_msg_handler handler;
rpc_message_t msg;
bool responded;
GSourceFunc cb;
gpointer data;
};
static void
work_destroy (gpointer data)
{
struct rpc_work_s *work = (struct rpc_work_s *)data;
if (!work->cb)
{
rpc_msg_reset (&work->msg);
rpc_socket_deref (work->sock);
}
g_free (work);
}
static void
worker_func (struct rpc_work_s *work, sigset_t *sigmask)
{
sigset_t oldmask;
/* Process callbacks using the worker sigmask */
if (sigmask)
pthread_sigmask (SIG_SETMASK, sigmask, &oldmask);
if (work && work->cb)
{
if (work->cb (work->data) == G_SOURCE_REMOVE)
work_destroy (work);
}
else if (work)
{
rpc_socket sock = work->sock;
rpc_msg_handler handler = work->handler;
rpc_id id = work->id;
rpc_message msg = &work->msg;
/* TEST: force a delay here to change callback timing */
if (rpc_test_random_watch_delay)
usleep (rand() & RPC_TEST_DELAY_MASK);
/* Process the callback */
DEBUG ("RPC[%d]: processing message from "APTERYX_CLIENT_ID"\n", sock->sock, sock->ns, sock->pid);
if (!handler (msg))
{
DEBUG ("RPC[%i]: handler failed\n", sock->sock);
work_destroy (work);
goto exit;
}
/* Send result */
DEBUG ("RPC[%d]: sending %zd bytes\n", sock->sock, msg->length);
if (!work->responded)
{
if (!msg->length)
{
msg->buffer = g_malloc0 (RPC_SOCKET_HDR_SIZE);
msg->size = RPC_SOCKET_HDR_SIZE;
}
rpc_socket_send_response (sock, id, msg->buffer, msg->length);
}
work_destroy (work);
}
exit:
/* Restore the process sigmask */
if (sigmask)
pthread_sigmask (SIG_SETMASK, sigmask, &oldmask);
}
static gboolean
slow_callback_fn (gpointer arg1)
{
struct rpc_work_s *work = (struct rpc_work_s *) arg1;
rpc_instance rpc = work->rpc;
/* Destroy GSource under the safety of the rpc lock */
pthread_mutex_lock (&rpc->lock);
GSource *source = g_main_context_find_source_by_funcs_user_data (rpc->slow_context, &g_timeout_funcs, (gpointer) work);
if (source)
g_source_destroy (source);
pthread_mutex_unlock (&rpc->lock);
/* Timeout callback but in single thread mode */
if (rpc->queue)
{
uint8_t dummy = 0;
g_async_queue_push (rpc->queue, (gpointer) work);
if (write (rpc->pollfd[1], &dummy, 1) != 1)
{
g_atomic_int_inc (&rpc->overflow);
}
}
else
worker_func (arg1, &rpc->worker_sigmask);
g_atomic_int_dec_and_test (&rpc->slow_count);
return G_SOURCE_REMOVE;
}
static gpointer
slow_thread_fn (gpointer data)
{
/* Block all signals */
sigset_t set;
sigfillset (&set);
pthread_sigmask (SIG_BLOCK, &set, NULL);
rpc_instance rpc = (rpc_instance) data;
g_main_loop_run (rpc->slow_loop);
g_main_loop_unref (rpc->slow_loop);
rpc->slow_loop = NULL;
g_main_context_unref (rpc->slow_context);
rpc->slow_context = NULL;
return NULL;
}
static void
submit_slow_work (rpc_instance rpc, struct rpc_work_s *work, guint timeout_ms)
{
/* Start the slow worker thread on demand */
if (!rpc->slow_loop)
{
rpc->slow_context = g_main_context_new ();
rpc->slow_loop = g_main_loop_new (rpc->slow_context, FALSE);
rpc->slow_thread = g_thread_new ("apteryx_slow", slow_thread_fn, (gpointer)rpc);
}
/* Pass to the slow worker thread either via a timeout or invoke directly */
g_atomic_int_inc (&rpc->slow_count);
if (timeout_ms)
{
/* Create a timeout callback on the slow worker thread */
GSource *source = g_timeout_source_new (timeout_ms);
g_source_set_priority (source, G_PRIORITY_DEFAULT);
g_source_set_callback (source, slow_callback_fn, (gpointer) work, NULL);
g_source_attach (source, rpc->slow_context);
g_source_unref (source);
}
else
{
/* Pass the work to the slow worker thread */
GSource *source;
source = g_idle_source_new ();
g_source_set_priority (source, G_PRIORITY_DEFAULT);
g_source_set_callback (source, slow_callback_fn, work, NULL);
g_source_attach (source, rpc->slow_context);
g_source_unref (source);
}
}
gpointer
rpc_add_callback (rpc_instance rpc, GSourceFunc cb, gpointer data, guint timeout_ms)
{
struct rpc_work_s *work = (struct rpc_work_s *) g_malloc0 (sizeof(*work));
assert (timeout_ms > 0);
work->rpc = rpc;
work->cb = cb;
work->data = data;
pthread_mutex_lock (&rpc->lock);
submit_slow_work (rpc, work, timeout_ms);
pthread_mutex_unlock (&rpc->lock);
DEBUG ("RPC-CB[%p]: ADD callback with timeout %dms\n", work, timeout_ms);
return (gpointer) work;
}
void
rpc_restart_callback (rpc_instance rpc, gpointer handle, guint timeout_ms)
{
struct rpc_work_s *work = (struct rpc_work_s *) handle;
GSource *source;
pthread_mutex_lock (&rpc->lock);
source = g_main_context_find_source_by_funcs_user_data (rpc->slow_context, &g_timeout_funcs, (gpointer) work);
if (source && !g_source_is_destroyed (source))
{
DEBUG ("RPC-CB[%p]: RESTART callback with timeout %dms\n", work, timeout_ms);
g_source_destroy (source);
g_atomic_int_dec_and_test (&rpc->slow_count);
submit_slow_work (rpc, work, timeout_ms);
}
else
{
DEBUG ("RPC-CB[%p]: RESTART - already completed sorry ...\n", work);
}
pthread_mutex_unlock (&rpc->lock);
}
void
rpc_cancel_callback (rpc_instance rpc, gpointer handle)
{
struct rpc_work_s *work = (struct rpc_work_s *) handle;
GSource *source;
pthread_mutex_lock (&rpc->lock);
source = g_main_context_find_source_by_funcs_user_data (rpc->slow_context, &g_timeout_funcs, (gpointer) work);
if (source && !g_source_is_destroyed (source))
{
DEBUG ("RPC-CB[%p]: CANCEL callback\n", work);
g_source_destroy (source);
g_atomic_int_dec_and_test (&rpc->slow_count);
work_destroy (work);
}
else
{
DEBUG ("RPC-CB[%p]: CANCEL - already completed sorry ...\n", work);
}
pthread_mutex_unlock (&rpc->lock);
}
static void
request_cb (rpc_socket sock, rpc_id id, void *buffer, size_t len)
{
rpc_instance rpc;
struct rpc_work_s *work;
bool watch = false;
DEBUG ("RPC[%d]: received %zd bytes\n", sock->sock, len);
/* Get the rpc instance from the socket */
rpc = (rpc_instance) rpc_socket_priv_get (sock);
if (rpc == NULL || rpc->handler == NULL)
{
ERROR ("RPC[%i]: bad service (instance:%p)\n", sock->sock, rpc);
return;
}
/* Store what we need to process this later */
rpc_socket_ref (sock);
work = g_malloc0 (sizeof(*work));
work->rpc = rpc;
work->sock = sock;
work->id = id;
work->handler = rpc->handler;
work->responded = false;
rpc_msg_push (&work->msg, len);
memcpy (work->msg.buffer + work->msg.offset, buffer, len);
work->msg.length = len;
/* Sneak a peak to see if we can respond now */
if (*(unsigned char*)buffer == MODE_WATCH)
{
DEBUG ("RPC[%i]: Early closure (no result required)\n", sock->sock);
uint8_t *empty = g_malloc0 (RPC_SOCKET_HDR_SIZE);
rpc_socket_send_response (sock, id, empty, 0);
g_free (empty);
work->responded = true;
}
/* Both variants of watch callbacks need to be processed on the same thread -
* this is the single thread servicing the "slow workers".
*/
if (*(unsigned char*)buffer == MODE_WATCH ||
*(unsigned char*)buffer == MODE_WATCH_WITH_ACK)
{
watch = true;
}
/* Check if in polling mode first */
if (rpc->queue)
{
uint8_t dummy = 0;
g_async_queue_push (rpc->queue, (gpointer) work);
if (write (rpc->pollfd[1], &dummy, 1) != 1)
{
g_atomic_int_inc (&rpc->overflow);
}
}
/* Callbacks from local Apteryx threads */
else if (watch || work->responded)
{
pthread_mutex_lock (&rpc->lock);
submit_slow_work (rpc, work, 0);
pthread_mutex_unlock (&rpc->lock);
}
else if (rpc->workers)
g_thread_pool_push (rpc->workers, work, NULL);
else
goto error;
return;
error:
if (work)
{
g_free (work);
}
rpc_socket_deref (sock);
return;
}
rpc_instance
rpc_init (int timeout, bool reuse_sock, rpc_msg_handler handler)
{
assert (timeout > 0);
/* Malloc memory for the new service */
rpc_instance rpc = (rpc_instance) g_malloc0 (sizeof(*rpc));
/* Create the server */
rpc_service server = rpc_service_init (request_cb, rpc);
if (server == NULL)
{
ERROR ("RPC: Failed to initialise server\n");
g_free ((void*)rpc);
return NULL;
}
/* Create a new RPC instance */
pthread_mutex_init (&rpc->lock, NULL);
pthread_sigmask (SIG_SETMASK, NULL, &rpc->worker_sigmask);
rpc->timeout = timeout;
rpc->reuse_sock = reuse_sock;
rpc->gc_time = get_time_us ();
rpc->handler = handler;
rpc->server = server;
rpc->clients = g_hash_table_new (g_str_hash, g_str_equal);
rpc->workers = g_thread_pool_new ((GFunc)worker_func, (gpointer)&rpc->worker_sigmask,
8, FALSE, NULL);
DEBUG ("RPC: New Instance (%p)\n", rpc);
return rpc;
}
static bool
destroy_rpc_client (gpointer key, gpointer value, gpointer rpc)
{
rpc_client_t *client = (rpc_client_t *) value;
DEBUG ("RPC: Destroy client to %s\n", (const char *)key);
/* Release the socket and free the client */
rpc_socket_deref (client->sock);
g_free (client->url);
g_free (client);
g_free (key);
return true;
}
static void
halt_client (gpointer _unused, gpointer _client, gpointer _also_unused)
{
rpc_client_t *client = (rpc_client_t*)_client;
if (client && client->sock && client->sock->thread)
{
pthread_cancel (client->sock->thread);
pthread_join (client->sock->thread, NULL);
}
}
void
rpc_halt (rpc_instance rpc)
{
if (rpc)
{
pthread_mutex_lock (&rpc->lock);
if (rpc->workers)
g_thread_pool_set_max_threads (rpc->workers, 0, NULL);
if (rpc->clients)
{
g_hash_table_foreach(rpc->clients, halt_client, NULL);
}
pthread_mutex_unlock (&rpc->lock);
}
}
void
rpc_shutdown (rpc_instance rpc)
{
int i;
assert (rpc);
DEBUG ("RPC: Shutdown Instance (%p)\n", rpc);
/* Need to wait until all threads are cleaned up */
for (i=0; i<10; i++)
{
g_thread_pool_stop_unused_threads ();
if (g_thread_pool_unprocessed (rpc->workers) == 0 &&
g_thread_pool_get_num_threads (rpc->workers) == 0 &&
g_thread_pool_get_num_unused_threads () == 0)
{
break;
}
else if (i >= 9)
{
ERROR ("RPC: Worker threads not shutting down\n");
}
g_usleep (RPC_TIMEOUT_US / 10);
}
g_thread_pool_free (rpc->workers, FALSE, TRUE);
rpc->workers = NULL;
if (rpc->slow_loop)
{
for (i=0; i<10; i++)
{
if (g_atomic_int_get(&rpc->slow_count) == 0)
{
break;
}
else if (i >= 9)
{
ERROR ("RPC: Slow thread not shutting down (%d more jobs)\n", g_atomic_int_get (&rpc->slow_count));
}
g_usleep (RPC_TIMEOUT_US / 10);
}
g_main_loop_quit (rpc->slow_loop);
g_thread_join (rpc->slow_thread);
rpc->slow_thread = NULL;
}
if (rpc->queue)
{
g_async_queue_unref (rpc->queue);
rpc->queue = NULL;
}
/* Stop the server */
rpc_service_die (rpc->server);
/* Remove all clients */
g_hash_table_foreach_remove (rpc->clients, (GHRFunc)destroy_rpc_client, rpc);
g_hash_table_destroy (rpc->clients);
rpc->clients = NULL;
/* Free instance */
g_free ((void*) rpc);
rpc = NULL;
}
bool
rpc_server_bind (rpc_instance rpc, const char *guid, const char *url)
{
assert (rpc);
assert (url);
/* Bind to the URL */
return rpc_service_bind_url (rpc->server, guid, url);
}
bool
rpc_server_release (rpc_instance rpc, const char *guid)
{
assert (rpc);
assert (guid);
/* Unbind from the URL */
return rpc_service_unbind_url (rpc->server, guid);
}
int
rpc_server_process (rpc_instance rpc, bool poll)
{
assert (rpc);
int flags;
int dummy = 0;
/* Start polling if requested */
if (poll && rpc->queue == NULL)
{
DEBUG ("RPC: Starting Polling mode\n");
if (pipe (rpc->pollfd) < 0 ||
(rpc->queue = g_async_queue_new_full (work_destroy)) == NULL)
{
ERROR ("RPC: Failed to enable poll mode\n");
goto cleanup;
}
/* Write is non-blocking to avoid blocking apteryxd */
flags = fcntl (rpc->pollfd[1], F_GETFL, 0);
if (fcntl (rpc->pollfd[1], F_SETFL, flags | O_NONBLOCK) < 0)
{
ERROR ("RPC: Failed to set pipe nonblocking\n");
goto cleanup;
}
}
/* Check for work and process it if required */
if (poll)
{
struct rpc_work_s *work = (struct rpc_work_s *) g_async_queue_try_pop (rpc->queue);
if (work)
{
/* Process a single work job */
DEBUG ("RPC: Polled processing...\n");
worker_func (work, NULL);
}
else
{
DEBUG ("RPC: Polling. Nothing to process\n");
}
/* Check for overflow */
if (g_atomic_int_get (&rpc->overflow) &&
write (rpc->pollfd[1], &dummy, 1) == 1)
{
g_atomic_int_dec_and_test (&rpc->overflow);
}
/* Return the poll fd for the client to monitor */
return rpc->pollfd[0];
}
/* Disable poll mode */
DEBUG ("RPC: Stopping Polling mode\n");
cleanup:
if (rpc->pollfd[0] != -1)
{
close (rpc->pollfd[0]);
rpc->pollfd[0] = -1;
close (rpc->pollfd[1]);
rpc->pollfd[1] = -1;
}
if (rpc->queue)
{
g_async_queue_unref (rpc->queue);
rpc->queue = NULL;
}
return -1;
}
static void
client_release (rpc_instance rpc, rpc_client_t *client, bool keep)
{
bool done;
/* Remove this client from the active list if requested */
if (!keep)
{
rpc_client_t *existing = NULL;
char *name = NULL;
/* Make sure it is actually on the list */
if (g_hash_table_lookup_extended (rpc->clients, client->url, (void **)&name, (void **)&existing)
&& existing == client)
{
DEBUG ("RPC[%d]: Abandon client to %s\n", client->sock ? client->sock->sock : -1, client->url);
/* Release the client and remove it from the list */
g_hash_table_remove (rpc->clients, client->url);
g_free (name);
client->refcount--;
}
}
/* Release the client */
done = (client->refcount <= 1);
client->refcount--;
if (done)
{
DEBUG ("RPC[%d]: Release client\n", client->sock ? client->sock->sock : -1);
/* Release the socket and free the client */
rpc_socket_deref (client->sock);
g_free (client->url);
g_free (client);
}
return;
}
static void
gc_clients (rpc_instance rpc)
{
GHashTableIter hiter;
const char *url;
rpc_client_t *client;
GList *dead = NULL;
GList *iter = NULL;
/* Minimum timeout between collections */
if (get_time_us () > rpc->gc_time + RPC_GC_TIMEOUT_US)
{
/* Iterate over all clients */
g_hash_table_iter_init (&hiter, rpc->clients);
while (g_hash_table_iter_next (&hiter, (void **)&url, (void **)&client))
{
if (client->sock && client->sock->dead)
dead = g_list_append (dead, client);
}
/* Cleanup any dead clients */
for (iter = dead; iter; iter = g_list_next (iter))
{
client = (rpc_client_t *) iter->data;
DEBUG ("RPC[%d]: Collecting dead socket for %s\n", client->sock->sock, client->url);
if (client->refcount < 2)
client_release (rpc, client, false);
}
g_list_free (dead);
/* Wait another timeout */
rpc->gc_time = get_time_us ();
}
}
static rpc_client_t *
rpc_client_existing_s (rpc_instance rpc, const char *url)
{
rpc_client_t *client = NULL;
char *name = NULL;
/* Garbage collect any stale clients */
gc_clients (rpc);
/* Find an existing client */
if (g_hash_table_lookup_extended (rpc->clients, url, (void **)&name, (void **)&client))
{
/* Reference this client */
client->refcount++;
/* Check the attached socket is still valid */
if (client->sock != NULL && !client->sock->dead && client->pid == getpid ())
{
/* This client will do */
return client;
}
/* Otherwise chuck this one away and make another */
DEBUG ("RPC[%d]: Pruning dead socket for %s\n", client->sock ? client->sock->sock : -1, url);
client_release (rpc, client, false);
}
/* Find an existing connection to one of our servers */
if (rpc->reuse_sock && rpc->server && rpc->server->servers)
{
for (GList *s = rpc->server->servers; s; s = s->next)
{
rpc_server server = (rpc_server) s->data;
for (GList *c = server->clients; c; c = c->next)
{
rpc_socket sock = (rpc_socket) c->data;
if (sock->dead)
continue;
char *surl = g_strdup_printf ("%s."APTERYX_CLIENT_ID, server->url, sock->ns, sock->pid);
DEBUG ("Compare client: %s to %s\n", url, surl);
if (g_strcmp0 (url, surl) == 0)
{
/* Create client */
client = g_malloc0 (sizeof (rpc_client_t));
client->sock = sock;
client->refcount = 1;
client->url = surl;
client->timeout = rpc->timeout;
client->pid = getpid ();
rpc_socket_ref (sock);
DEBUG ("RPC[%d]: Reuse client to %s\n", sock->sock, url);
/* Add it to the list of clients */
g_hash_table_insert (rpc->clients, g_strdup (url), client);
client->refcount++;
return client;
}
free (surl);
}
}
}
return NULL;
}
rpc_client
rpc_client_existing (rpc_instance rpc, const char *url)
{
rpc_client_t *client = NULL;
assert (rpc);
assert (url);
/* Protect the instance */
pthread_mutex_lock (&rpc->lock);
client = rpc_client_existing_s (rpc, url);
/* Release the instance */
pthread_mutex_unlock (&rpc->lock);
return client;
}
rpc_client
rpc_client_connect (rpc_instance rpc, const char *url)
{
rpc_client_t *client = NULL;
assert (rpc);
assert (url);
/* Protect the instance */
pthread_mutex_lock (&rpc->lock);
client = rpc_client_existing_s (rpc, url);
if (client)
{
/* Found a client */
pthread_mutex_unlock (&rpc->lock);
return client;
}
/* Catch old style client callbacks */
if (rpc->reuse_sock && g_str_has_prefix (url, "unix:") && g_strcmp0 (url, APTERYX_SERVER) != 0)
{
ERROR ("RPC: Client socket to %s has been lost!\n", url);
}
/* Create a new socket */
rpc_socket sock = rpc_socket_connect_service (url, request_cb);
if (sock == NULL)
{
ERROR ("RPC: Failed to create socket to %s\n", url);
pthread_mutex_unlock (&rpc->lock);
return NULL;
}
sock->priv = (void*)rpc;
/* Create client */
client = g_malloc0 (sizeof (rpc_client_t));
if (!client)
{
ERROR ("RPC: Failed to allocate memory for client service\n");
rpc_socket_deref (sock);
pthread_mutex_unlock (&rpc->lock);
return NULL;
}
client->sock = sock;
client->refcount = 1;
client->url = g_strdup (url);
client->timeout = rpc->timeout;
client->pid = getpid ();
DEBUG ("RPC[%d]: New client to %s\n", sock->sock, url);
/* Add it to the list of clients */
g_hash_table_insert (rpc->clients, g_strdup (url), client);
client->refcount++;
/* Start processing this socket */
if (!rpc_socket_process (sock))
{
ERROR ("RPC: Failed to start socket processing for client service\n");
g_hash_table_remove (rpc->clients, client->url);
g_free (client->url);
g_free (client);
rpc_socket_deref (sock);
pthread_mutex_unlock (&rpc->lock);
return NULL;
}
/* Release the instance */
pthread_mutex_unlock (&rpc->lock);
return client;
}
void
rpc_client_release (rpc_instance rpc, rpc_client client, bool keep)
{
assert (rpc);
assert (client);
/* Protected release */
pthread_mutex_lock (&rpc->lock);
client_release (rpc, client, keep);
pthread_mutex_unlock (&rpc->lock);
return;
}
#define MSG_MINIMUM_MALLOC 1024
void
rpc_msg_reset (rpc_message msg)
{
if (msg->size)
g_free (msg->buffer);
memset (msg, 0, sizeof (rpc_message_t));
}
void
rpc_msg_push (rpc_message msg, size_t len)
{
/* Check if we need to (re)alloc */
if (!msg->buffer || (msg->size - msg->offset) < len)
{
size_t size = RPC_SOCKET_HDR_SIZE + msg->length + len;
size = size < MSG_MINIMUM_MALLOC ? MSG_MINIMUM_MALLOC : size;
//DEBUG ("MSG: realloc(%zd/%zd)\n", len, size);
msg->buffer = g_realloc (msg->buffer, size);
msg->size = size;
}
msg->offset = msg->offset ?: RPC_SOCKET_HDR_SIZE;
}
void
rpc_msg_encode_uint8 (rpc_message msg, uint8_t value)
{
int len = sizeof (uint8_t);
rpc_msg_push (msg, len);
*((uint8_t*)(msg->buffer + msg->offset)) = value;
msg->length += len;
msg->offset += len;
}
uint8_t
rpc_msg_decode_uint8 (rpc_message msg)
{
int len = sizeof (uint8_t);
if (((msg->length + RPC_SOCKET_HDR_SIZE)- msg->offset) < len)
return 0;
uint8_t value = (*((uint8_t*)(msg->buffer + msg->offset)));
msg->offset += len;
return value;
}
void
rpc_msg_encode_uint64 (rpc_message msg, uint64_t value)
{
int len = sizeof (uint64_t);
rpc_msg_push (msg, len);
value = htobe64 (value);
memcpy (((char*)msg->buffer) + msg->offset, &value, len);
msg->length += len;
msg->offset += len;
}
uint64_t
rpc_msg_decode_uint64 (rpc_message msg)
{
int len = sizeof (uint64_t);
if (((msg->length + RPC_SOCKET_HDR_SIZE) - msg->offset) < len)
return 0;
uint64_t value;
memcpy (&value, ((char*)msg->buffer) + msg->offset, len);
value = be64toh (value);
msg->offset += len;
return value;
}
void
rpc_msg_encode_string (rpc_message msg, const char *value)
{
int len = strlen (value) + 1;
rpc_msg_push (msg, len);
memcpy (msg->buffer + msg->offset, value, len);
msg->length += len;
msg->offset += len;
return;
}
char*
rpc_msg_decode_string (rpc_message msg)
{
if (msg->offset >= (msg->length + RPC_SOCKET_HDR_SIZE))
return NULL;
char *value = (char *) (msg->buffer + msg->offset);
msg->offset += strlen (value) + 1;
return value;
}
static void
rpc_msg_add_children (rpc_message msg, GNode *root)
{
GNode *child = NULL;
/* If there are any children, write them here. */
if (g_node_first_child(root))
{
rpc_msg_encode_uint8 (msg, rpc_start_children);
for (child = g_node_first_child(root); child; child = g_node_next_sibling(child))
{
rpc_msg_encode_tree (msg, child);
}
rpc_msg_encode_uint8 (msg, rpc_end_children);
}
}
void
rpc_msg_encode_tree (rpc_message msg, GNode *root)
{
const char *key = APTERYX_NAME (root);
const char *value = APTERYX_HAS_VALUE (root) ? APTERYX_VALUE (root) : NULL;
rpc_msg_encode_uint8 (msg, rpc_value);
/* Write this key (and value). */
rpc_msg_encode_string (msg, key);
rpc_msg_encode_string (msg, value ?: "");
/* If this node has no value, add its children. */
if (!APTERYX_HAS_VALUE (root))
{
rpc_msg_add_children (msg, root);
}
}
static GNode *
_rpc_msg_decode_tree (rpc_message msg, GNode *root)
{
rpc_type_t type;
char *key = NULL;
const char *value = NULL;
GNode *node = NULL;
do
{
type = rpc_msg_decode_uint8 (msg);
switch (type)
{
case rpc_value:
key = rpc_msg_decode_string (msg);
value = rpc_msg_decode_string (msg);
if (!root)
{
/* Find the leading part of this path. Sometimes these nodes
* can be a compound path (root key = /test/a/b/c) and they need
* to be broken up into root + value.
*/
gchar *path = g_strdup (key);
key = strrchr(path, '/');
if (key)