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Move server-related code to server.c

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The file server.c already existed, but exposed a low-level API. Make it
higher-level, so that scrcpy.c does not handle server details directly.
This commit is contained in:
Romain Vimont 2018-02-08 15:16:27 +01:00
parent 6c578b5caa
commit 28c5cc030b
7 changed files with 161 additions and 104 deletions
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18
app/src/command.c
View File

@ -3,6 +3,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <SDL2/SDL_log.h>
#define ARRAY_LEN(a) (sizeof(a) / sizeof(a[0]))
@ -63,3 +64,20 @@ process_t adb_push(const char *serial, const char *local, const char *remote) {
const char *const adb_cmd[] = {"push", (char *) local, (char *) remote};
return adb_execute(serial, adb_cmd, ARRAY_LEN(adb_cmd));
}
SDL_bool process_check_success(process_t proc, const char *name) {
if (proc == PROCESS_NONE) {
SDL_LogError(SDL_LOG_CATEGORY_SYSTEM, "Could not execute \"%s\"", name);
return SDL_FALSE;
}
exit_code_t exit_code;
if (!cmd_simple_wait(proc, &exit_code)) {
if (exit_code != NO_EXIT_CODE) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "\"%s\" returned with value %" PRIexitcode, name, exit_code);
} else {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "\"%s\" exited unexpectedly", name);
}
return SDL_FALSE;
}
return SDL_TRUE;
}

4
app/src/command.h
View File

@ -42,4 +42,8 @@ process_t adb_reverse(const char *serial, const char *device_socket_name, uint16
process_t adb_reverse_remove(const char *serial, const char *device_socket_name);
process_t adb_push(const char *serial, const char *local, const char *remote);
// convenience function to wait for a successful process execution
// automatically log process errors with the provided process name
SDL_bool process_check_success(process_t process, const char *name);
#endif

4
app/src/netutil.c
View File

@ -4,7 +4,7 @@
// contrary to SDLNet_TCP_Send and SDLNet_TCP_Recv, SDLNet_TCP_Accept is non-blocking
// so we need to block before calling it
TCPsocket blocking_accept(TCPsocket server_socket) {
TCPsocket server_socket_accept(TCPsocket server_socket) {
SDLNet_SocketSet set = SDLNet_AllocSocketSet(1);
if (!set) {
SDL_LogCritical(SDL_LOG_CATEGORY_SYSTEM, "Could not allocate socket set");
@ -19,7 +19,7 @@ TCPsocket blocking_accept(TCPsocket server_socket) {
// timeout is (2^32-1) milliseconds, this should be sufficient
if (SDLNet_CheckSockets(set, -1) != 1) {
SDL_LogError(SDL_LOG_CATEGORY_SYSTEM, "Could not check socket: %s", SDL_GetError());
SDL_LogError(SDL_LOG_CATEGORY_SYSTEM, "Could not check socket");
SDLNet_FreeSocketSet(set);
return NULL;
}

3
app/src/netutil.h
View File

@ -3,6 +3,7 @@
#include <SDL2/SDL_net.h>
TCPsocket blocking_accept(TCPsocket server_socket);
// blocking accept on the server socket
TCPsocket server_socket_accept(TCPsocket server_socket);
#endif

100
app/src/scrcpy.c
View File

@ -23,6 +23,7 @@
#define DEVICE_NAME_FIELD_LENGTH 64
static struct server server = SERVER_INITIALIZER;
static struct screen screen = SCREEN_INITIALIZER;
static struct frames frames;
static struct decoder decoder;
@ -46,14 +47,6 @@ static void count_frame(void) {
}
}
static TCPsocket listen_on_port(Uint16 port) {
IPaddress addr = {
.host = INADDR_ANY,
.port = SDL_SwapBE16(port),
};
return SDLNet_TCP_Open(&addr);
}
// name must be at least DEVICE_NAME_FIELD_LENGTH bytes
static SDL_bool read_initial_device_info(TCPsocket socket, char *device_name, struct size *size) {
unsigned char buf[DEVICE_NAME_FIELD_LENGTH + 4];
@ -80,23 +73,6 @@ static struct point get_mouse_point(void) {
};
}
static int wait_for_success(process_t proc, const char *name) {
if (proc == PROCESS_NONE) {
SDL_LogError(SDL_LOG_CATEGORY_SYSTEM, "Could not execute \"%s\"", name);
return -1;
}
exit_code_t exit_code;
if (!cmd_simple_wait(proc, &exit_code)) {
if (exit_code != NO_EXIT_CODE) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "\"%s\" returned with value %" PRIexitcode, name, exit_code);
} else {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "\"%s\" exited unexpectedly", name);
}
return -1;
}
return 0;
}
static void send_keycode(enum android_keycode keycode, const char *name) {
// send DOWN event
struct control_event control_event = {
@ -344,43 +320,17 @@ static void event_loop(void) {
}
SDL_bool scrcpy(const char *serial, Uint16 local_port, Uint16 max_size, Uint32 bit_rate) {
SDL_bool ret = SDL_TRUE;
process_t push_proc = push_server(serial);
if (wait_for_success(push_proc, "adb push")) {
if (!server_start(&server, serial, local_port, max_size, bit_rate)) {
return SDL_FALSE;
}
process_t reverse_tunnel_proc = enable_tunnel(serial, local_port);
if (wait_for_success(reverse_tunnel_proc, "adb reverse")) {
return SDL_FALSE;
}
TCPsocket server_socket = listen_on_port(local_port);
if (!server_socket) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not open video socket");
goto finally_adb_reverse_remove;
}
// server will connect to our socket
process_t server = start_server(serial, max_size, bit_rate);
if (server == PROCESS_NONE) {
ret = SDL_FALSE;
SDLNet_TCP_Close(server_socket);
goto finally_adb_reverse_remove;
}
// to reduce startup time, we could be tempted to init other stuff before blocking here
// but we should not block after SDL_Init since it handles the signals (Ctrl+C) in its
// event loop: blocking could lead to deadlock
TCPsocket device_socket = blocking_accept(server_socket);
// we don't need the server socket anymore
SDLNet_TCP_Close(server_socket);
TCPsocket device_socket = server_connect_to(&server);
if (!device_socket) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not accept video socket: %s", SDL_GetError());
ret = SDL_FALSE;
stop_server(server);
goto finally_adb_reverse_remove;
server_stop(&server, serial);
return SDL_FALSE;
}
char device_name[DEVICE_NAME_FIELD_LENGTH];
@ -391,19 +341,17 @@ SDL_bool scrcpy(const char *serial, Uint16 local_port, Uint16 max_size, Uint32 b
// to init the window immediately
if (!read_initial_device_info(device_socket, device_name, &frame_size)) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not retrieve initial screen size");
ret = SDL_FALSE;
SDLNet_TCP_Close(device_socket);
stop_server(server);
goto finally_adb_reverse_remove;
server_stop(&server, serial);
return SDL_FALSE;
}
if (!frames_init(&frames)) {
ret = SDL_FALSE;
SDLNet_TCP_Close(device_socket);
stop_server(server);
goto finally_adb_reverse_remove;
server_stop(&server, serial);
return SDL_FALSE;
}
SDL_bool ret = SDL_TRUE;
decoder.frames = &frames;
decoder.video_socket = device_socket;
@ -411,22 +359,17 @@ SDL_bool scrcpy(const char *serial, Uint16 local_port, Uint16 max_size, Uint32 b
// start the decoder
if (!decoder_start(&decoder)) {
ret = SDL_FALSE;
SDLNet_TCP_Close(device_socket);
stop_server(server);
server_stop(&server, serial);
goto finally_destroy_frames;
}
if (!controller_init(&controller, device_socket)) {
ret = SDL_FALSE;
SDLNet_TCP_Close(device_socket);
stop_server(server);
goto finally_stop_decoder;
}
if (!controller_start(&controller)) {
ret = SDL_FALSE;
SDLNet_TCP_Close(device_socket);
stop_server(server);
goto finally_destroy_controller;
}
@ -450,28 +393,11 @@ finally_stop_and_join_controller:
finally_destroy_controller:
controller_destroy(&controller);
finally_stop_decoder:
SDLNet_TCP_Close(device_socket);
// let the server some time to print any exception trace before killing it
struct timespec timespec = {
.tv_sec = 0,
.tv_nsec = 100000000, // 100ms
};
nanosleep(&timespec, NULL); // ignore error
// kill the server before decoder_join() to wake up the decoder
stop_server(server);
server_stop(&server, serial);
decoder_join(&decoder);
finally_destroy_frames:
frames_destroy(&frames);
finally_adb_reverse_remove:
{
process_t remove = disable_tunnel(serial);
if (remove != PROCESS_NONE) {
// ignore failure
cmd_simple_wait(remove, NULL);
}
}
return ret;
}

105
app/src/server.c
View File

@ -1,28 +1,34 @@
#include "command.h"
#include "server.h"
#include <SDL2/SDL_log.h>
#include <SDL2/SDL_net.h>
#include <errno.h>
#include <stdint.h>
#include <time.h>
#include "netutil.h"
#define SOCKET_NAME "scrcpy"
process_t push_server(const char *serial) {
static SDL_bool push_server(const char *serial) {
const char *server_path = getenv("SCRCPY_SERVER_JAR");
if (!server_path) {
server_path = "scrcpy-server.jar";
}
return adb_push(serial, server_path, "/data/local/tmp/scrcpy-server.jar");
process_t process = adb_push(serial, server_path, "/data/local/tmp/scrcpy-server.jar");
return process_check_success(process, "adb push");
}
process_t enable_tunnel(const char *serial, Uint16 local_port) {
return adb_reverse(serial, SOCKET_NAME, local_port);
static SDL_bool enable_tunnel(const char *serial, Uint16 local_port) {
process_t process = adb_reverse(serial, SOCKET_NAME, local_port);
return process_check_success(process, "adb reverse");
}
process_t disable_tunnel(const char *serial) {
return adb_reverse_remove(serial, SOCKET_NAME);
static SDL_bool disable_tunnel(const char *serial) {
process_t process = adb_reverse_remove(serial, SOCKET_NAME);
return process_check_success(process, "adb reverse --remove");
}
process_t start_server(const char *serial, Uint16 max_size, Uint32 bit_rate) {
static process_t execute_server(const char *serial, Uint16 max_size, Uint32 bit_rate) {
char max_size_string[6];
char bit_rate_string[11];
sprintf(max_size_string, "%"PRIu16, max_size);
@ -39,8 +45,89 @@ process_t start_server(const char *serial, Uint16 max_size, Uint32 bit_rate) {
return adb_execute(serial, cmd, sizeof(cmd) / sizeof(cmd[0]));
}
void stop_server(process_t server) {
static void terminate_server(process_t server) {
if (!cmd_terminate(server)) {
SDL_LogError(SDL_LOG_CATEGORY_SYSTEM, "Could not terminate server: %s", strerror(errno));
}
}
static TCPsocket listen_on_port(Uint16 port) {
IPaddress addr = {
.host = INADDR_ANY,
.port = SDL_SwapBE16(port),
};
return SDLNet_TCP_Open(&addr);
}
void server_init(struct server *server) {
*server = (struct server) SERVER_INITIALIZER;
}
SDL_bool server_start(struct server *server, const char *serial, Uint16 local_port,
Uint16 max_size, Uint32 bit_rate) {
if (!push_server(serial)) {
return SDL_FALSE;
}
if (!enable_tunnel(serial, local_port)) {
return SDL_FALSE;
}
// At the application level, the device part is "the server" because it
// serves video stream and control. However, at network level, the client
// listens and the server connects to the client. That way, the client can
// listen before starting the server app, so there is no need to try to
// connect until the server socket is listening on the device.
server->server_socket = listen_on_port(local_port);
if (!server->server_socket) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not listen on port %" PRIu16, local_port);
disable_tunnel(serial);
return SDL_FALSE;
}
// server will connect to our server socket
server->process = execute_server(serial, max_size, bit_rate);
if (server->process == PROCESS_NONE) {
SDLNet_TCP_Close(server->server_socket);
disable_tunnel(serial);
return SDL_FALSE;
}
server->adb_reverse_enabled = SDL_TRUE;
return SDL_TRUE;
}
TCPsocket server_connect_to(struct server *server) {
SDL_assert(server->server_socket);
server->device_socket = server_socket_accept(server->server_socket);
// we don't need the server socket anymore
SDLNet_TCP_Close(server->server_socket);
server->server_socket = NULL;
return server->device_socket;
}
void server_stop(struct server *server, const char *serial) {
SDL_assert(server->process != PROCESS_NONE);
if (server->server_socket) {
SDLNet_TCP_Close(server->server_socket);
}
if (server->device_socket) {
SDLNet_TCP_Close(server->device_socket);
}
// let the server some time to print any exception trace before killing it
struct timespec timespec = {
.tv_sec = 0,
.tv_nsec = 100000000, // 100ms
};
nanosleep(&timespec, NULL); // ignore error
terminate_server(server->process);
if (server->adb_reverse_enabled) {
// ignore failure
disable_tunnel(serial);
}
}

31
app/src/server.h
View File

@ -1,13 +1,34 @@
#ifndef SERVER_H
#define SERVER_H
#include <SDL2/SDL_net.h>
#include "command.h"
process_t push_server(const char *serial);
process_t enable_tunnel(const char *serial, Uint16 local_port);
process_t disable_tunnel(const char *serial);
struct server {
process_t process;
TCPsocket server_socket;
TCPsocket device_socket;
SDL_bool adb_reverse_enabled;
};
process_t start_server(const char *serial, Uint16 max_size, Uint32 bit_rate);
void stop_server(process_t server);
#define SERVER_INITIALIZER { \
.process = PROCESS_NONE, \
.server_socket = NULL, \
.device_socket = NULL, \
.adb_reverse_enabled = SDL_FALSE, \
}
// init default values
void server_init(struct server *server);
// push, enable tunnel et start the server
SDL_bool server_start(struct server *server, const char *serial, Uint16 local_port,
Uint16 max_size, Uint32 bit_rate);
// block until the communication with the server is established
TCPsocket server_connect_to(struct server *server);
// disconnect and kill the server process
void server_stop(struct server *server, const char *serial);
#endif