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ipc: allow sending commands with named arguments

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This has been part of the libmpv for a while, so the implementation in
the IPC code is quite simple: just pass the mpv_node representing the
value of the "command" field without further checks to
mpv_command_node().

The only problem are the IPC-specific commands, which essentially have
their own dispatch mechanism. They expect an array. I'm not going to
rewrite the dispatch mechanism, so these still work only with an array.
I decided make the other case explicit with cmd==NULL. (I could also
have set cmd=="", which would have avoided changing each if condition
since "" matches no existing command, but that felt dirty.)
This commit is contained in:
wm4 2020-02-24 00:31:46 +01:00
parent 67311af05f
commit c418aa3807
2 changed files with 33 additions and 23 deletions
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11
DOCS/man/ipc.rst
View File

@ -202,6 +202,17 @@ commands that finished execution immediately.
Cancellation of asynchronous commands is available in the libmpv API, but has
not yet been implemented in the IPC protocol.
Commands with named arguments
-----------------------------
If the ``command`` field is a JSON object, named arguments are expected. This
is described in the C API ``mpv_command_node()`` documentation (the
``MPV_FORMAT_NODE_MAP`` case). In some cases, this may make commands more
readable, while some obscure commands basically require using named arguments.
Currently, only "proper" commands (as listed by `List of Input Commands`_)
support named arguments.
Commands
--------

45
input/ipc.c
View File

@ -254,35 +254,34 @@ static char *json_execute_command(struct mpv_handle *client, void *ta_parent,
}
mpv_node *cmd_node = node_map_get(&msg_node, "command");
if (!cmd_node ||
(cmd_node->format != MPV_FORMAT_NODE_ARRAY) ||
!cmd_node->u.list->num)
{
if (!cmd_node) {
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;
if (cmd_node->format == MPV_FORMAT_NODE_ARRAY) {
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;
}
cmd = cmd_str_node->u.string;
if (!strcmp("client_name", cmd)) {
if (cmd && !strcmp("client_name", cmd)) {
const char *client_name = mpv_client_name(client);
mpv_node_map_add_string(ta_parent, &reply_node, "data", client_name);
rc = MPV_ERROR_SUCCESS;
} else if (!strcmp("get_time_us", cmd)) {
} else if (cmd && !strcmp("get_time_us", cmd)) {
int64_t time_us = mpv_get_time_us(client);
mpv_node_map_add_int64(ta_parent, &reply_node, "data", time_us);
rc = MPV_ERROR_SUCCESS;
} else if (!strcmp("get_version", cmd)) {
} else if (cmd && !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)) {
} else if (cmd && !strcmp("get_property", cmd)) {
mpv_node result_node;
if (cmd_node->u.list->num != 2) {
@ -301,7 +300,7 @@ static char *json_execute_command(struct mpv_handle *client, void *ta_parent,
mpv_node_map_add(ta_parent, &reply_node, "data", &result_node);
mpv_free_node_contents(&result_node);
}
} else if (!strcmp("get_property_string", cmd)) {
} else if (cmd && !strcmp("get_property_string", cmd)) {
if (cmd_node->u.list->num != 2) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
@ -320,8 +319,8 @@ static char *json_execute_command(struct mpv_handle *client, void *ta_parent,
} else {
mpv_node_map_add_null(ta_parent, &reply_node, "data");
}
} else if (!strcmp("set_property", cmd) ||
!strcmp("set_property_string", cmd))
} else if (cmd && (!strcmp("set_property", cmd) ||
!strcmp("set_property_string", cmd)))
{
if (cmd_node->u.list->num != 3) {
rc = MPV_ERROR_INVALID_PARAMETER;
@ -335,7 +334,7 @@ static char *json_execute_command(struct mpv_handle *client, void *ta_parent,
rc = mpv_set_property(client, cmd_node->u.list->values[1].u.string,
MPV_FORMAT_NODE, &cmd_node->u.list->values[2]);
} else if (!strcmp("observe_property", cmd)) {
} else if (cmd && !strcmp("observe_property", cmd)) {
if (cmd_node->u.list->num != 3) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
@ -355,7 +354,7 @@ static char *json_execute_command(struct mpv_handle *client, void *ta_parent,
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)) {
} else if (cmd && !strcmp("observe_property_string", cmd)) {
if (cmd_node->u.list->num != 3) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
@ -375,7 +374,7 @@ static char *json_execute_command(struct mpv_handle *client, void *ta_parent,
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)) {
} else if (cmd && !strcmp("unobserve_property", cmd)) {
if (cmd_node->u.list->num != 2) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
@ -388,7 +387,7 @@ static char *json_execute_command(struct mpv_handle *client, void *ta_parent,
rc = mpv_unobserve_property(client,
cmd_node->u.list->values[1].u.int64);
} else if (!strcmp("request_log_messages", cmd)) {
} else if (cmd && !strcmp("request_log_messages", cmd)) {
if (cmd_node->u.list->num != 2) {
rc = MPV_ERROR_INVALID_PARAMETER;
goto error;
@ -401,8 +400,8 @@ static char *json_execute_command(struct mpv_handle *client, void *ta_parent,
rc = mpv_request_log_messages(client,
cmd_node->u.list->values[1].u.string);
} else if (!strcmp("enable_event", cmd) ||
!strcmp("disable_event", cmd))
} else if (cmd && (!strcmp("enable_event", cmd) ||
!strcmp("disable_event", cmd)))
{
bool enable = !strcmp("enable_event", cmd);