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756adee999
mpv/input/ipc.c
wm4 756adee999 client API: be more lenient about mpv_suspend/resume mismatches 
Before this commit, this was defined to trigger undefined behavior. This
was nice because it required less code; but on the other hand, Lua as
well as IPC support had to check these things manually. Do it directly
in the API to avoid code duplication, and to make the API more robust.
(The total code size still grows, though...)

Since all of the failure cases were originally meant to ruin things
forever, there is no way to return error codes. So just print the
errors.
2014-12-15 14:44:47 +01:00

797 lines
23 KiB
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/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mpv 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <pthread.h>
#include <assert.h>
#include <errno.h>
#include <unistd.h>
#include <poll.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/un.h>
#include "config.h"
#include "osdep/io.h"
#include "osdep/threads.h"
#include "common/common.h"
#include "common/global.h"
#include "common/msg.h"
#include "input/input.h"
#include "libmpv/client.h"
#include "misc/bstr.h"
#include "misc/json.h"
#include "options/m_option.h"
#include "options/options.h"
#include "options/path.h"
#include "player/client.h"
struct mp_ipc_ctx {
struct mp_log *log;
struct mp_client_api *client_api;
const char *path;
pthread_t thread;
int death_pipe[2];
};
struct client_arg {
struct mp_log *log;
struct mpv_handle *client;
char *client_name;
int client_fd;
bool close_client_fd;
bool writable;
};
static mpv_node *mpv_node_map_get(mpv_node *src, const char *key)
{
if (src->format != MPV_FORMAT_NODE_MAP)
return NULL;
for (int i = 0; i < src->u.list->num; i++)
if (!strcmp(key, src->u.list->keys[i]))
return &src->u.list->values[i];
return NULL;
}
static mpv_node *mpv_node_array_get(mpv_node *src, int index)
{
if (src->format != MPV_FORMAT_NODE_ARRAY)
return NULL;
if (src->u.list->num < (index + 1))
return NULL;
return &src->u.list->values[index];
}
static void mpv_node_array_add(void *ta_parent, mpv_node *src, mpv_node *val)
{
if (src->format != MPV_FORMAT_NODE_ARRAY)
return;
if (!src->u.list)
src->u.list = talloc_zero(ta_parent, mpv_node_list);
MP_TARRAY_GROW(src->u.list, src->u.list->values, src->u.list->num);
static const struct m_option type = { .type = CONF_TYPE_NODE };
m_option_get_node(&type, ta_parent, &src->u.list->values[src->u.list->num], val);
src->u.list->num++;
}
static void mpv_node_array_add_string(void *ta_parent, mpv_node *src, const char *val)
{
mpv_node val_node = {.format = MPV_FORMAT_STRING, .u.string = (char *)val};
mpv_node_array_add(ta_parent, src, &val_node);
}
static void mpv_node_map_add(void *ta_parent, mpv_node *src, const char *key, mpv_node *val)
{
if (src->format != MPV_FORMAT_NODE_MAP)
return;
if (!src->u.list)
src->u.list = talloc_zero(ta_parent, mpv_node_list);
MP_TARRAY_GROW(src->u.list, src->u.list->keys, src->u.list->num);
MP_TARRAY_GROW(src->u.list, src->u.list->values, src->u.list->num);
src->u.list->keys[src->u.list->num] = talloc_strdup(ta_parent, key);
static const struct m_option type = { .type = CONF_TYPE_NODE };
m_option_get_node(&type, ta_parent, &src->u.list->values[src->u.list->num], val);
src->u.list->num++;
}
static void mpv_node_map_add_null(void *ta_parent, mpv_node *src, const char *key)
{
mpv_node val_node = {.format = MPV_FORMAT_NONE};
mpv_node_map_add(ta_parent, src, key, &val_node);
}
static void mpv_node_map_add_flag(void *ta_parent, mpv_node *src, const char *key, bool val)
{
mpv_node val_node = {.format = MPV_FORMAT_FLAG, .u.flag = val};
mpv_node_map_add(ta_parent, src, key, &val_node);
}
static void mpv_node_map_add_int64(void *ta_parent, mpv_node *src, const char *key, int64_t val)
{
mpv_node val_node = {.format = MPV_FORMAT_INT64, .u.int64 = val};
mpv_node_map_add(ta_parent, src, key, &val_node);
}
static void mpv_node_map_add_double(void *ta_parent, mpv_node *src, const char *key, double val)
{
mpv_node val_node = {.format = MPV_FORMAT_DOUBLE, .u.double_ = val};
mpv_node_map_add(ta_parent, src, key, &val_node);
}
static void mpv_node_map_add_string(void *ta_parent, mpv_node *src, const char *key, const char *val)
{
mpv_node val_node = {.format = MPV_FORMAT_STRING, .u.string = (char*)val};
mpv_node_map_add(ta_parent, src, key, &val_node);
}
static void mpv_event_to_node(void *ta_parent, mpv_event *event, mpv_node *dst)
{
mpv_node_map_add_string(ta_parent, dst, "event", mpv_event_name(event->event_id));
if (event->reply_userdata)
mpv_node_map_add_int64(ta_parent, dst, "id", event->reply_userdata);
if (event->error < 0)
mpv_node_map_add_string(ta_parent, dst, "error", mpv_error_string(event->error));
switch (event->event_id) {
case MPV_EVENT_LOG_MESSAGE: {
mpv_event_log_message *msg = event->data;
mpv_node_map_add_string(ta_parent, dst, "prefix", msg->prefix);
mpv_node_map_add_string(ta_parent, dst, "level", msg->level);
mpv_node_map_add_string(ta_parent, dst, "text", msg->text);
break;
}
case MPV_EVENT_CLIENT_MESSAGE: {
mpv_event_client_message *msg = event->data;
mpv_node args_node = {.format = MPV_FORMAT_NODE_ARRAY, .u.list = NULL};
for (int n = 0; n < msg->num_args; n++)
mpv_node_array_add_string(ta_parent, &args_node, msg->args[n]);
mpv_node_map_add(ta_parent, dst, "args", &args_node);
break;
}
case MPV_EVENT_PROPERTY_CHANGE: {
mpv_event_property *prop = event->data;
mpv_node_map_add_string(ta_parent, dst, "name", prop->name);
switch (prop->format) {
case MPV_FORMAT_NODE:
mpv_node_map_add(ta_parent, dst, "data", prop->data);
break;
case MPV_FORMAT_DOUBLE:
mpv_node_map_add_double(ta_parent, dst, "data", *(double *)prop->data);
break;
case MPV_FORMAT_FLAG:
mpv_node_map_add_flag(ta_parent, dst, "data", *(int *)prop->data);
break;
case MPV_FORMAT_STRING:
mpv_node_map_add_string(ta_parent, dst, "data", *(char **)prop->data);
break;
default:
mpv_node_map_add_null(ta_parent, dst, "data");
}
break;
}
}
}
static char *json_encode_event(mpv_event *event)
{
void *ta_parent = talloc_new(NULL);
mpv_node event_node = {.format = MPV_FORMAT_NODE_MAP, .u.list = NULL};
mpv_event_to_node(ta_parent, event, &event_node);
char *output = talloc_strdup(NULL, "");
json_write(&output, &event_node);
output = ta_talloc_strdup_append(output, "\n");
talloc_free(ta_parent);
return output;
}
// Function is allowed to modify src[n].
static char *json_execute_command(struct client_arg *arg, void *ta_parent,
char *src)
{
int rc;
const char *cmd = NULL;
mpv_node msg_node;
mpv_node reply_node = {.format = MPV_FORMAT_NODE_MAP, .u.list = NULL};
rc = json_parse(ta_parent, &msg_node, &src, 3);
if (rc < 0) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
if (msg_node.format != MPV_FORMAT_NODE_MAP) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
mpv_node *cmd_node = mpv_node_map_get(&msg_node, "command");
if (!cmd_node ||
(cmd_node->format != MPV_FORMAT_NODE_ARRAY) ||
!cmd_node->u.list->num)
{
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
mpv_node *cmd_str_node = mpv_node_array_get(cmd_node, 0);
if (!cmd_str_node || (cmd_str_node->format != MPV_FORMAT_STRING)) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
cmd = cmd_str_node->u.string;
if (!strcmp("client_name", cmd)) {
const char *client_name = mpv_client_name(arg->client);
mpv_node_map_add_string(ta_parent, &reply_node, "data", client_name);
rc = MPV_ERROR_SUCCESS;
} else if (!strcmp("get_time_us", cmd)) {
int64_t time_us = mpv_get_time_us(arg->client);
mpv_node_map_add_int64(ta_parent, &reply_node, "data", time_us);
rc = MPV_ERROR_SUCCESS;
} else if (!strcmp("get_version", cmd)) {
int64_t ver = mpv_client_api_version();
mpv_node_map_add_int64(ta_parent, &reply_node, "data", ver);
rc = MPV_ERROR_SUCCESS;
} else if (!strcmp("get_property", cmd)) {
mpv_node result_node;
if (cmd_node->u.list->num != 2) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
if (cmd_node->u.list->values[1].format != MPV_FORMAT_STRING) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
rc = mpv_get_property(arg->client, cmd_node->u.list->values[1].u.string,
MPV_FORMAT_NODE, &result_node);
if (rc >= 0) {
mpv_node_map_add(ta_parent, &reply_node, "data", &result_node);
mpv_free_node_contents(&result_node);
}
} else if (!strcmp("get_property_string", cmd)) {
if (cmd_node->u.list->num != 2) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
if (cmd_node->u.list->values[1].format != MPV_FORMAT_STRING) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
char *result = mpv_get_property_string(arg->client,
cmd_node->u.list->values[1].u.string);
if (!result) {
mpv_node_map_add_null(ta_parent, &reply_node, "data");
} else {
mpv_node_map_add_string(ta_parent, &reply_node, "data", result);
mpv_free(result);
}
} else if (!strcmp("set_property", cmd)) {
if (cmd_node->u.list->num != 3) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
if (cmd_node->u.list->values[1].format != MPV_FORMAT_STRING) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
rc = mpv_set_property(arg->client, cmd_node->u.list->values[1].u.string,
MPV_FORMAT_NODE, &cmd_node->u.list->values[2]);
} else if (!strcmp("set_property_string", cmd)) {
if (cmd_node->u.list->num != 3) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
if (cmd_node->u.list->values[1].format != MPV_FORMAT_STRING) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
if (cmd_node->u.list->values[2].format != MPV_FORMAT_STRING) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
rc = mpv_set_property_string(arg->client,
cmd_node->u.list->values[1].u.string,
cmd_node->u.list->values[2].u.string);
} else if (!strcmp("observe_property", cmd)) {
if (cmd_node->u.list->num != 3) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
if (cmd_node->u.list->values[1].format != MPV_FORMAT_INT64) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
if (cmd_node->u.list->values[2].format != MPV_FORMAT_STRING) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
rc = mpv_observe_property(arg->client,
cmd_node->u.list->values[1].u.int64,
cmd_node->u.list->values[2].u.string,
MPV_FORMAT_NODE);
} else if (!strcmp("observe_property_string", cmd)) {
if (cmd_node->u.list->num != 3) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
if (cmd_node->u.list->values[1].format != MPV_FORMAT_INT64) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
if (cmd_node->u.list->values[2].format != MPV_FORMAT_STRING) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
rc = mpv_observe_property(arg->client,
cmd_node->u.list->values[1].u.int64,
cmd_node->u.list->values[2].u.string,
MPV_FORMAT_STRING);
} else if (!strcmp("unobserve_property", cmd)) {
if (cmd_node->u.list->num != 2) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
if (cmd_node->u.list->values[1].format != MPV_FORMAT_INT64) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
rc = mpv_unobserve_property(arg->client,
cmd_node->u.list->values[1].u.int64);
} else if (!strcmp("request_log_messages", cmd)) {
if (cmd_node->u.list->num != 2) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
if (cmd_node->u.list->values[1].format != MPV_FORMAT_STRING) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
}
rc = mpv_request_log_messages(arg->client,
cmd_node->u.list->values[1].u.string);
} else if (!strcmp("suspend", cmd)) {
mpv_suspend(arg->client);
rc = MPV_ERROR_SUCCESS;
} else if (!strcmp("resume", cmd)) {
mpv_resume(arg->client);
rc = MPV_ERROR_SUCCESS;
} else {
mpv_node result_node;
rc = mpv_command_node(arg->client, cmd_node, &result_node);
if (rc >= 0)
mpv_node_map_add(ta_parent, &reply_node, "data", &result_node);
}
error:
mpv_node_map_add_string(ta_parent, &reply_node, "error", mpv_error_string(rc));
char *output = talloc_strdup(ta_parent, "");
json_write(&output, &reply_node);
output = ta_talloc_strdup_append(output, "\n");
return output;
}
static char *text_execute_command(struct client_arg *arg, void *tmp, char *src)
{
mpv_command_string(arg->client, src);
return NULL;
}
static int ipc_write(int fd, const char *buf, size_t count)
{
while (count > 0) {
ssize_t rc = write(fd, buf, count);
if (rc <= 0) {
if (rc == 0)
return -1;
if (errno == EINTR)
continue;
if (errno == EAGAIN)
return 0;
return rc;
}
count -= rc;
buf += rc;
}
return 0;
}
static void *client_thread(void *p)
{
pthread_detach(pthread_self());
int rc;
struct client_arg *arg = p;
bstr client_msg = { talloc_strdup(NULL, ""), 0 };
mpthread_set_name(arg->client_name);
int pipe_fd = mpv_get_wakeup_pipe(arg->client);
if (pipe_fd < 0) {
MP_ERR(arg, "Could not get wakeup pipe\n");
goto done;
}
MP_INFO(arg, "Client connected\n");
struct pollfd fds[2] = {
{.events = POLLIN, .fd = pipe_fd},
{.events = POLLIN, .fd = arg->client_fd},
};
fcntl(arg->client_fd, F_SETFL, fcntl(arg->client_fd, F_GETFL, 0) | O_NONBLOCK);
while (1) {
rc = poll(fds, 2, -1);
if (rc < 0) {
MP_ERR(arg, "Poll error\n");
continue;
}
if (fds[0].revents & POLLIN) {
char discard[100];
read(pipe_fd, discard, sizeof(discard));
while (1) {
mpv_event *event = mpv_wait_event(arg->client, 0);
if (event->event_id == MPV_EVENT_NONE)
break;
if (event->event_id == MPV_EVENT_SHUTDOWN)
goto done;
if (!arg->writable)
continue;
char *event_msg = json_encode_event(event);
if (!event_msg) {
MP_ERR(arg, "Encoding error\n");
goto done;
}
rc = ipc_write(arg->client_fd, event_msg, strlen(event_msg));
talloc_free(event_msg);
if (rc < 0) {
MP_ERR(arg, "Write error\n");
goto done;
}
}
}
if (fds[1].revents & POLLIN) {
while (1) {
char buf[128];
bstr append = { buf, 0 };
ssize_t bytes = read(arg->client_fd, buf, sizeof(buf));
if (bytes < 0) {
if (errno == EAGAIN)
break;
MP_ERR(arg, "Read error\n");
goto done;
}
if (bytes == 0) {
MP_INFO(arg, "Client disconnected\n");
goto done;
}
append.len = bytes;
bstr_xappend(NULL, &client_msg, append);
while (bstrchr(client_msg, '\n') != -1) {
void *tmp = talloc_new(NULL);
bstr rest;
bstr line = bstr_getline(client_msg, &rest);
char *line0 = bstrto0(tmp, line);
talloc_steal(tmp, client_msg.start);
client_msg = bstrdup(NULL, rest);
json_skip_whitespace(&line0);
char *reply_msg = NULL;
if (line0[0] == '\0' || line0[0] == '#') {
// skip
} else if (line0[0] == '{') {
reply_msg = json_execute_command(arg, tmp, line0);
} else {
reply_msg = text_execute_command(arg, tmp, line0);
}
if (reply_msg && arg->writable) {
rc = ipc_write(arg->client_fd, reply_msg,
strlen(reply_msg));
if (rc < 0) {
MP_ERR(arg, "Write error\n");
talloc_free(tmp);
goto done;
}
}
talloc_free(tmp);
}
}
}
}
done:
talloc_free(client_msg.start);
if (arg->close_client_fd)
close(arg->client_fd);
mpv_detach_destroy(arg->client);
talloc_free(arg);
return NULL;
}
static void ipc_start_client(struct mp_ipc_ctx *ctx, struct client_arg *client)
{
client->client = mp_new_client(ctx->client_api, client->client_name),
client->log = mp_client_get_log(client->client);
pthread_t client_thr;
if (pthread_create(&client_thr, NULL, client_thread, client)) {
mpv_detach_destroy(client->client);
if (client->close_client_fd)
close(client->client_fd);
talloc_free(client);
}
}
static void ipc_start_client_json(struct mp_ipc_ctx *ctx, int id, int fd)
{
struct client_arg *client = talloc_ptrtype(NULL, client);
*client = (struct client_arg){
.client_name = talloc_asprintf(client, "ipc-%d", id),
.client_fd = fd,
.close_client_fd = true,
.writable = true,
};
ipc_start_client(ctx, client);
}
static void ipc_start_client_text(struct mp_ipc_ctx *ctx, const char *path)
{
int mode = O_RDONLY;
int client_fd = -1;
bool close_client_fd = true;
if (strcmp(path, "/dev/stdin") == 0) { // for symmetry with Linux
client_fd = STDIN_FILENO;
close_client_fd = false;
} else {
// Use RDWR for FIFOs to ensure they stay open over multiple accesses.
struct stat st;
if (stat(path, &st) == 0 && S_ISFIFO(st.st_mode))
mode = O_RDWR;
client_fd = open(path, mode);
}
if (client_fd < 0) {
MP_ERR(ctx, "Could not open pipe at '%s'\n", path);
return;
}
struct client_arg *client = talloc_ptrtype(NULL, client);
*client = (struct client_arg){
.client_name = "input-file",
.client_fd = client_fd,
.close_client_fd = close_client_fd,
.writable = false,
};
ipc_start_client(ctx, client);
}
static void *ipc_thread(void *p)
{
int rc;
int ipc_fd;
struct sockaddr_un ipc_un;
struct mp_ipc_ctx *arg = p;
mpthread_set_name("ipc socket listener");
MP_INFO(arg, "Starting IPC master\n");
ipc_fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (ipc_fd < 0) {
MP_ERR(arg, "Could not create IPC socket\n");
goto done;
}
size_t path_len = strlen(arg->path);
if (path_len >= sizeof(ipc_un.sun_path) - 1) {
MP_ERR(arg, "Could not create IPC socket\n");
goto done;
}
ipc_un.sun_family = AF_UNIX,
strncpy(ipc_un.sun_path, arg->path, sizeof(ipc_un.sun_path));
unlink(ipc_un.sun_path);
if (ipc_un.sun_path[0] == '@') {
ipc_un.sun_path[0] = '\0';
path_len--;
}
size_t addr_len = offsetof(struct sockaddr_un, sun_path) + 1 + path_len;
rc = bind(ipc_fd, (struct sockaddr *) &ipc_un, addr_len);
if (rc < 0) {
MP_ERR(arg, "Could not bind IPC socket\n");
goto done;
}
rc = listen(ipc_fd, 10);
if (rc < 0) {
MP_ERR(arg, "Could not listen on IPC socket\n");
goto done;
}
int client_num = 0;
struct pollfd fds[2] = {
{.events = POLLIN, .fd = arg->death_pipe[0]},
{.events = POLLIN, .fd = ipc_fd},
};
while (1) {
rc = poll(fds, 2, -1);
if (rc < 0) {
MP_ERR(arg, "Poll error\n");
continue;
}
if (fds[0].revents & POLLIN)
goto done;
if (fds[1].revents & POLLIN) {
int client_fd = accept(ipc_fd, NULL, NULL);
if (client_fd < 0) {
MP_ERR(arg, "Could not accept IPC client\n");
goto done;
}
ipc_start_client_json(arg, client_num++, client_fd);
}
}
done:
if (ipc_fd >= 0)
close(ipc_fd);
return NULL;
}
struct mp_ipc_ctx *mp_init_ipc(struct mp_client_api *client_api,
struct mpv_global *global)
{
struct MPOpts *opts = global->opts;
struct mp_ipc_ctx *arg = talloc_ptrtype(NULL, arg);
*arg = (struct mp_ipc_ctx){
.log = mp_log_new(arg, global->log, "ipc"),
.client_api = client_api,
.path = mp_get_user_path(arg, global, opts->ipc_path),
.death_pipe = {-1, -1},
};
char *input_file = mp_get_user_path(arg, global, opts->input_file);
if (input_file && *input_file)
ipc_start_client_text(arg, input_file);
if (!opts->ipc_path || !*opts->ipc_path)
goto out;
if (mp_make_wakeup_pipe(arg->death_pipe) < 0)
goto out;
if (pthread_create(&arg->thread, NULL, ipc_thread, arg))
goto out;
return arg;
out:
close(arg->death_pipe[0]);
close(arg->death_pipe[1]);
talloc_free(arg);
return NULL;
}
void mp_uninit_ipc(struct mp_ipc_ctx *arg)
{
if (!arg)
return;
write(arg->death_pipe[1], &(char){0}, 1);
pthread_join(arg->thread, NULL);
close(arg->death_pipe[0]);
close(arg->death_pipe[1]);
talloc_free(arg);
}
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