flipperzero-firmware/applications/services/rpc/rpc.c

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#include "rpc_i.h"
#include <pb.h>
#include <pb_decode.h>
#include <pb_encode.h>
#include <storage.pb.h>
#include <flipper.pb.h>
#include <portmacro.h>
#include <furi.h>
#include <cli/cli.h>
#include <stdint.h>
#include <stdio.h>
#include <m-dict.h>
#define TAG "RpcSrv"
typedef enum {
RpcEvtNewData = (1 << 0),
RpcEvtDisconnect = (1 << 1),
} RpcEvtFlags;
#define RPC_ALL_EVENTS (RpcEvtNewData | RpcEvtDisconnect)
DICT_DEF2(RpcHandlerDict, pb_size_t, M_DEFAULT_OPLIST, RpcHandler, M_POD_OPLIST)
typedef struct {
RpcSystemAlloc alloc;
RpcSystemFree free;
void* context;
} RpcSystemCallbacks;
static RpcSystemCallbacks rpc_systems[] = {
{
.alloc = rpc_system_system_alloc,
.free = NULL,
},
{
.alloc = rpc_system_storage_alloc,
.free = rpc_system_storage_free,
},
{
.alloc = rpc_system_app_alloc,
.free = rpc_system_app_free,
},
{
.alloc = rpc_system_gui_alloc,
.free = rpc_system_gui_free,
},
{
.alloc = rpc_system_gpio_alloc,
.free = NULL,
}};
struct RpcSession {
Rpc* rpc;
FuriThread* thread;
RpcHandlerDict_t handlers;
FuriStreamBuffer* stream;
PB_Main* decoded_message;
bool terminate;
void** system_contexts;
bool decode_error;
FuriMutex* callbacks_mutex;
RpcSendBytesCallback send_bytes_callback;
RpcBufferIsEmptyCallback buffer_is_empty_callback;
RpcSessionClosedCallback closed_callback;
RpcSessionTerminatedCallback terminated_callback;
void* context;
};
struct Rpc {
FuriMutex* busy_mutex;
};
static void rpc_close_session_process(const PB_Main* request, void* context) {
furi_assert(request);
furi_assert(context);
RpcSession* session = (RpcSession*)context;
rpc_send_and_release_empty(session, request->command_id, PB_CommandStatus_OK);
furi_mutex_acquire(session->callbacks_mutex, FuriWaitForever);
if(session->closed_callback) {
session->closed_callback(session->context);
} else {
FURI_LOG_W(TAG, "Session stop isn't processed by transport layer");
}
furi_mutex_release(session->callbacks_mutex);
}
void rpc_session_set_context(RpcSession* session, void* context) {
furi_assert(session);
furi_mutex_acquire(session->callbacks_mutex, FuriWaitForever);
session->context = context;
furi_mutex_release(session->callbacks_mutex);
}
void rpc_session_set_close_callback(RpcSession* session, RpcSessionClosedCallback callback) {
furi_assert(session);
furi_mutex_acquire(session->callbacks_mutex, FuriWaitForever);
session->closed_callback = callback;
furi_mutex_release(session->callbacks_mutex);
}
void rpc_session_set_send_bytes_callback(RpcSession* session, RpcSendBytesCallback callback) {
furi_assert(session);
furi_mutex_acquire(session->callbacks_mutex, FuriWaitForever);
session->send_bytes_callback = callback;
furi_mutex_release(session->callbacks_mutex);
}
void rpc_session_set_buffer_is_empty_callback(
RpcSession* session,
RpcBufferIsEmptyCallback callback) {
furi_assert(session);
furi_mutex_acquire(session->callbacks_mutex, FuriWaitForever);
session->buffer_is_empty_callback = callback;
furi_mutex_release(session->callbacks_mutex);
}
void rpc_session_set_terminated_callback(
RpcSession* session,
RpcSessionTerminatedCallback callback) {
furi_assert(session);
furi_mutex_acquire(session->callbacks_mutex, FuriWaitForever);
session->terminated_callback = callback;
furi_mutex_release(session->callbacks_mutex);
}
/* Doesn't forbid using rpc_feed_bytes() after session close - it's safe.
* Because any bytes received in buffer will be flushed before next session.
* If bytes get into stream buffer before it's get epmtified and this
* command is gets processed - it's safe either. But case of it is quite
* odd: client sends close request and sends command after.
*/
size_t
rpc_session_feed(RpcSession* session, uint8_t* encoded_bytes, size_t size, TickType_t timeout) {
furi_assert(session);
furi_assert(encoded_bytes);
if(!size) return 0;
size_t bytes_sent = furi_stream_buffer_send(session->stream, encoded_bytes, size, timeout);
furi_thread_flags_set(furi_thread_get_id(session->thread), RpcEvtNewData);
return bytes_sent;
}
size_t rpc_session_get_available_size(RpcSession* session) {
furi_assert(session);
return furi_stream_buffer_spaces_available(session->stream);
}
bool rpc_pb_stream_read(pb_istream_t* istream, pb_byte_t* buf, size_t count) {
furi_assert(istream);
furi_assert(buf);
RpcSession* session = istream->state;
furi_assert(session);
furi_assert(istream->bytes_left);
uint32_t flags = 0;
size_t bytes_received = 0;
while(1) {
bytes_received += furi_stream_buffer_receive(
session->stream, buf + bytes_received, count - bytes_received, 0);
if(furi_stream_buffer_is_empty(session->stream)) {
if(session->buffer_is_empty_callback) {
session->buffer_is_empty_callback(session->context);
}
}
if(session->decode_error) {
/* never go out till RPC_EVENT_DISCONNECT come */
bytes_received = 0;
}
if(count == bytes_received) {
break;
} else {
flags = furi_thread_flags_wait(RPC_ALL_EVENTS, FuriFlagWaitAny, FuriWaitForever);
if(flags & RpcEvtDisconnect) {
if(furi_stream_buffer_is_empty(session->stream)) {
session->terminate = true;
istream->bytes_left = 0;
bytes_received = 0;
break;
} else {
/* Save disconnect flag and continue reading buffer */
furi_thread_flags_set(furi_thread_get_id(session->thread), RpcEvtDisconnect);
}
} else if(flags & RpcEvtNewData) {
// Just wake thread up
}
}
}
#if SRV_RPC_DEBUG
rpc_debug_print_data("INPUT", buf, bytes_received);
#endif
return (count == bytes_received);
}
static bool rpc_pb_content_callback(pb_istream_t* stream, const pb_field_t* field, void** arg) {
furi_assert(stream);
RpcSession* session = stream->state;
furi_assert(session);
furi_assert(field);
RpcHandler* handler = RpcHandlerDict_get(session->handlers, field->tag);
if(handler && handler->decode_submessage) {
handler->decode_submessage(stream, field, arg);
}
return true;
}
static int32_t rpc_session_worker(void* context) {
furi_assert(context);
RpcSession* session = (RpcSession*)context;
Rpc* rpc = session->rpc;
FURI_LOG_D(TAG, "Session started");
while(1) {
pb_istream_t istream = {
.callback = rpc_pb_stream_read,
.state = session,
.errmsg = NULL,
.bytes_left = RPC_MAX_MESSAGE_SIZE, /* max incoming message size */
};
bool message_decode_failed = false;
if(pb_decode_ex(&istream, &PB_Main_msg, session->decoded_message, PB_DECODE_DELIMITED)) {
#if SRV_RPC_DEBUG
FURI_LOG_I(TAG, "INPUT:");
rpc_debug_print_message(session->decoded_message);
#endif
RpcHandler* handler =
RpcHandlerDict_get(session->handlers, session->decoded_message->which_content);
if(handler && handler->message_handler) {
furi_check(furi_mutex_acquire(rpc->busy_mutex, FuriWaitForever) == FuriStatusOk);
handler->message_handler(session->decoded_message, handler->context);
furi_check(furi_mutex_release(rpc->busy_mutex) == FuriStatusOk);
} else if(session->decoded_message->which_content == 0) {
/* Receiving zeroes means message is 0-length, which
* is valid for proto3: all fields are filled with default values.
* 0 - is default value for which_content field.
* Mark it as decode error, because there is no content message
* in Main message with tag 0.
*/
message_decode_failed = true;
} else if(!handler && !session->terminate) {
FURI_LOG_E(
TAG,
"Message(%d) decoded, but not implemented",
session->decoded_message->which_content);
rpc_send_and_release_empty(
session,
session->decoded_message->command_id,
PB_CommandStatus_ERROR_NOT_IMPLEMENTED);
}
} else {
message_decode_failed = true;
}
if(message_decode_failed) {
furi_stream_buffer_reset(session->stream);
if(!session->terminate) {
/* Protobuf can't determine start and end of message.
* Handle this by adding varint at beginning
* of a message (PB_ENCODE_DELIMITED). But decoding fail
* means we can't be sure next bytes are varint for next
* message, so the only way to close session.
* RPC itself can't make decision to close session. It has
* to notify:
* 1) down layer (transport)
* 2) other side (companion app)
* Who are responsible to handle RPC session lifecycle.
* Companion receives 2 messages: ERROR_DECODE and session_closed.
*/
FURI_LOG_E(TAG, "Decode failed, error: \'%.128s\'", PB_GET_ERROR(&istream));
session->decode_error = true;
rpc_send_and_release_empty(session, 0, PB_CommandStatus_ERROR_DECODE);
furi_mutex_acquire(session->callbacks_mutex, FuriWaitForever);
if(session->closed_callback) {
session->closed_callback(session->context);
}
furi_mutex_release(session->callbacks_mutex);
}
}
pb_release(&PB_Main_msg, session->decoded_message);
if(session->terminate) {
FURI_LOG_D(TAG, "Session terminated");
break;
}
}
return 0;
}
static void rpc_session_free_callback(FuriThreadState thread_state, void* context) {
furi_assert(context);
RpcSession* session = (RpcSession*)context;
if(thread_state == FuriThreadStateStopped) {
for(size_t i = 0; i < COUNT_OF(rpc_systems); ++i) {
if(rpc_systems[i].free) {
rpc_systems[i].free(session->system_contexts[i]);
}
}
free(session->system_contexts);
free(session->decoded_message);
RpcHandlerDict_clear(session->handlers);
furi_stream_buffer_free(session->stream);
furi_mutex_acquire(session->callbacks_mutex, FuriWaitForever);
if(session->terminated_callback) {
session->terminated_callback(session->context);
}
furi_mutex_release(session->callbacks_mutex);
furi_mutex_free(session->callbacks_mutex);
furi_thread_free(session->thread);
free(session);
}
}
RpcSession* rpc_session_open(Rpc* rpc) {
furi_assert(rpc);
RpcSession* session = malloc(sizeof(RpcSession));
session->callbacks_mutex = furi_mutex_alloc(FuriMutexTypeNormal);
session->stream = furi_stream_buffer_alloc(RPC_BUFFER_SIZE, 1);
session->rpc = rpc;
session->terminate = false;
session->decode_error = false;
RpcHandlerDict_init(session->handlers);
session->decoded_message = malloc(sizeof(PB_Main));
session->decoded_message->cb_content.funcs.decode = rpc_pb_content_callback;
session->decoded_message->cb_content.arg = session;
session->system_contexts = malloc(COUNT_OF(rpc_systems) * sizeof(void*));
for(size_t i = 0; i < COUNT_OF(rpc_systems); ++i) {
session->system_contexts[i] = rpc_systems[i].alloc(session);
}
RpcHandler rpc_handler = {
.message_handler = rpc_close_session_process,
.decode_submessage = NULL,
.context = session,
};
rpc_add_handler(session, PB_Main_stop_session_tag, &rpc_handler);
session->thread = furi_thread_alloc();
furi_thread_set_name(session->thread, "RpcSessionWorker");
furi_thread_set_stack_size(session->thread, 3072);
furi_thread_set_context(session->thread, session);
furi_thread_set_callback(session->thread, rpc_session_worker);
furi_thread_set_state_context(session->thread, session);
furi_thread_set_state_callback(session->thread, rpc_session_free_callback);
furi_thread_start(session->thread);
return session;
}
void rpc_session_close(RpcSession* session) {
furi_assert(session);
furi_assert(session->rpc);
rpc_session_set_send_bytes_callback(session, NULL);
rpc_session_set_close_callback(session, NULL);
rpc_session_set_buffer_is_empty_callback(session, NULL);
furi_thread_flags_set(furi_thread_get_id(session->thread), RpcEvtDisconnect);
}
void rpc_on_system_start(void* p) {
UNUSED(p);
Rpc* rpc = malloc(sizeof(Rpc));
rpc->busy_mutex = furi_mutex_alloc(FuriMutexTypeNormal);
Cli* cli = furi_record_open(RECORD_CLI);
cli_add_command(
cli, "start_rpc_session", CliCommandFlagParallelSafe, rpc_cli_command_start_session, rpc);
furi_record_create(RECORD_RPC, rpc);
}
void rpc_add_handler(RpcSession* session, pb_size_t message_tag, RpcHandler* handler) {
furi_assert(RpcHandlerDict_get(session->handlers, message_tag) == NULL);
RpcHandlerDict_set_at(session->handlers, message_tag, *handler);
}
void rpc_send(RpcSession* session, PB_Main* message) {
furi_assert(session);
furi_assert(message);
pb_ostream_t ostream = PB_OSTREAM_SIZING;
#if SRV_RPC_DEBUG
FURI_LOG_I(TAG, "OUTPUT:");
rpc_debug_print_message(message);
#endif
bool result = pb_encode_ex(&ostream, &PB_Main_msg, message, PB_ENCODE_DELIMITED);
furi_check(result && ostream.bytes_written);
uint8_t* buffer = malloc(ostream.bytes_written);
ostream = pb_ostream_from_buffer(buffer, ostream.bytes_written);
pb_encode_ex(&ostream, &PB_Main_msg, message, PB_ENCODE_DELIMITED);
#if SRV_RPC_DEBUG
rpc_debug_print_data("OUTPUT", buffer, ostream.bytes_written);
#endif
furi_mutex_acquire(session->callbacks_mutex, FuriWaitForever);
if(session->send_bytes_callback) {
session->send_bytes_callback(session->context, buffer, ostream.bytes_written);
}
furi_mutex_release(session->callbacks_mutex);
free(buffer);
}
void rpc_send_and_release(RpcSession* session, PB_Main* message) {
rpc_send(session, message);
pb_release(&PB_Main_msg, message);
}
void rpc_send_and_release_empty(RpcSession* session, uint32_t command_id, PB_CommandStatus status) {
PB_Main message = {
.command_id = command_id,
.command_status = status,
.has_next = false,
.which_content = PB_Main_empty_tag,
};
rpc_send_and_release(session, &message);
pb_release(&PB_Main_msg, &message);
}