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fl_method_channel.cc
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1 // Copyright 2013 The Flutter Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "flutter/shell/platform/linux/public/flutter_linux/fl_method_channel.h"
6
7 #include <gmodule.h>
8
9 #include "flutter/shell/platform/linux/fl_method_call_private.h"
10 #include "flutter/shell/platform/linux/fl_method_channel_private.h"
11 #include "flutter/shell/platform/linux/fl_method_codec_private.h"
12
13 struct _FlMethodChannel {
14 GObject parent_instance;
15
16 // Messenger to communicate on.
17 FlBinaryMessenger* messenger;
18
19 // TRUE if the channel has been closed.
20 gboolean channel_closed;
21
22 // Channel name.
23 gchar* name;
24
25 // Codec to en/decode messages.
26 FlMethodCodec* codec;
27
28 // Function called when a method call is received.
29 FlMethodChannelMethodCallHandler method_call_handler;
30 gpointer method_call_handler_data;
31 GDestroyNotify method_call_handler_destroy_notify;
32 };
33
34 G_DEFINE_TYPE(FlMethodChannel, fl_method_channel, G_TYPE_OBJECT)
35
36 // Called when a binary message is received on this channel.
37 static void message_cb(FlBinaryMessenger* messenger,
38 const gchar* channel,
39 GBytes* message,
40 FlBinaryMessengerResponseHandle* response_handle,
41 gpointer user_data) {
42 FlMethodChannel* self = FL_METHOD_CHANNEL(user_data);
43
44 if (self->method_call_handler == nullptr) {
45 return;
46 }
47
48 g_autofree gchar* method = nullptr;
49 g_autoptr(FlValue) args = nullptr;
50 g_autoptr(GError) error = nullptr;
51 if (!fl_method_codec_decode_method_call(self->codec, message, &method, &args,
52 &error)) {
53 g_warning("Failed to decode method call: %s", error->message);
54 return;
55 }
56
57 g_autoptr(FlMethodCall) method_call =
58 fl_method_call_new(method, args, self, response_handle);
59 self->method_call_handler(self, method_call, self->method_call_handler_data);
60 }
61
62 // Called when a response is received to a sent message.
63 static void message_response_cb(GObject* object,
64 GAsyncResult* result,
65 gpointer user_data) {
66 g_autoptr(GTask) task = G_TASK(user_data);
67 g_task_return_pointer(task, g_object_ref(result), g_object_unref);
68 }
69
70 // Called when the channel handler is closed.
71 static void channel_closed_cb(gpointer user_data) {
72 g_autoptr(FlMethodChannel) self = FL_METHOD_CHANNEL(user_data);
73
74 self->channel_closed = TRUE;
75
76 // Disconnect handler.
77 if (self->method_call_handler_destroy_notify != nullptr) {
78 self->method_call_handler_destroy_notify(self->method_call_handler_data);
79 }
80 self->method_call_handler = nullptr;
81 self->method_call_handler_data = nullptr;
82 self->method_call_handler_destroy_notify = nullptr;
83 }
84
85 static void fl_method_channel_dispose(GObject* object) {
86 FlMethodChannel* self = FL_METHOD_CHANNEL(object);
87
88 // Note we don't have to clear the handler in messenger as it holds
89 // a reference to this object so the following code is only run after
90 // the messenger has closed the channel already.
91
92 g_clear_object(&self->messenger);
93 g_clear_pointer(&self->name, g_free);
94 g_clear_object(&self->codec);
95
96 if (self->method_call_handler_destroy_notify != nullptr) {
97 self->method_call_handler_destroy_notify(self->method_call_handler_data);
98 }
99 self->method_call_handler = nullptr;
100 self->method_call_handler_data = nullptr;
101 self->method_call_handler_destroy_notify = nullptr;
102
103 G_OBJECT_CLASS(fl_method_channel_parent_class)->dispose(object);
104 }
105
106 static void fl_method_channel_class_init(FlMethodChannelClass* klass) {
107 G_OBJECT_CLASS(klass)->dispose = fl_method_channel_dispose;
108 }
109
110 static void fl_method_channel_init(FlMethodChannel* self) {}
111
112 G_MODULE_EXPORT FlMethodChannel* fl_method_channel_new(
113 FlBinaryMessenger* messenger,
114 const gchar* name,
115 FlMethodCodec* codec) {
116 g_return_val_if_fail(FL_IS_BINARY_MESSENGER(messenger), nullptr);
117 g_return_val_if_fail(name != nullptr, nullptr);
118 g_return_val_if_fail(FL_IS_METHOD_CODEC(codec), nullptr);
119
120 FlMethodChannel* self =
121 FL_METHOD_CHANNEL(g_object_new(fl_method_channel_get_type(), nullptr));
122
123 self->messenger = FL_BINARY_MESSENGER(g_object_ref(messenger));
124 self->name = g_strdup(name);
125 self->codec = FL_METHOD_CODEC(g_object_ref(codec));
126
127 fl_binary_messenger_set_message_handler_on_channel(
128 self->messenger, self->name, message_cb, g_object_ref(self),
129 channel_closed_cb);
130
131 return self;
132 }
133
134 G_MODULE_EXPORT void fl_method_channel_set_method_call_handler(
135 FlMethodChannel* self,
136 FlMethodChannelMethodCallHandler handler,
137 gpointer user_data,
138 GDestroyNotify destroy_notify) {
139 g_return_if_fail(FL_IS_METHOD_CHANNEL(self));
140
141 // Don't set handler if channel closed.
142 if (self->channel_closed) {
143 if (handler != nullptr) {
144 g_warning(
145 "Attempted to set method call handler on a closed FlMethodChannel");
146 }
147 if (destroy_notify != nullptr) {
148 destroy_notify(user_data);
149 }
150 return;
151 }
152
153 if (self->method_call_handler_destroy_notify != nullptr) {
154 self->method_call_handler_destroy_notify(self->method_call_handler_data);
155 }
156
157 self->method_call_handler = handler;
158 self->method_call_handler_data = user_data;
159 self->method_call_handler_destroy_notify = destroy_notify;
160 }
161
162 G_MODULE_EXPORT void fl_method_channel_invoke_method(
163 FlMethodChannel* self,
164 const gchar* method,
165 FlValue* args,
166 GCancellable* cancellable,
167 GAsyncReadyCallback callback,
168 gpointer user_data) {
169 g_return_if_fail(FL_IS_METHOD_CHANNEL(self));
170 g_return_if_fail(method != nullptr);
171
172 g_autoptr(GTask) task =
173 callback != nullptr ? g_task_new(self, cancellable, callback, user_data)
174 : nullptr;
175
176 g_autoptr(GError) error = nullptr;
177 g_autoptr(GBytes) message =
178 fl_method_codec_encode_method_call(self->codec, method, args, &error);
179 if (message == nullptr) {
180 if (task != nullptr) {
181 g_task_return_error(task, g_error_copy(error));
182 }
183 return;
184 }
185
186 fl_binary_messenger_send_on_channel(
187 self->messenger, self->name, message, cancellable,
188 callback != nullptr ? message_response_cb : nullptr,
189 g_steal_pointer(&task));
190 }
191
192 G_MODULE_EXPORT FlMethodResponse* fl_method_channel_invoke_method_finish(
193 FlMethodChannel* self,
194 GAsyncResult* result,
195 GError** error) {
196 g_return_val_if_fail(FL_IS_METHOD_CHANNEL(self), nullptr);
197 g_return_val_if_fail(g_task_is_valid(result, self), nullptr);
198
199 GTask* task = G_TASK(result);
200 g_autoptr(GAsyncResult) r =
201 G_ASYNC_RESULT(g_task_propagate_pointer(task, error));
202 if (r == nullptr) {
203 return nullptr;
204 }
205
206 g_autoptr(GBytes) response =
207 fl_binary_messenger_send_on_channel_finish(self->messenger, r, error);
208 if (response == nullptr) {
209 return nullptr;
210 }
211
212 return fl_method_codec_decode_response(self->codec, response, error);
213 }
214
215 gboolean fl_method_channel_respond(
216 FlMethodChannel* self,
217 FlBinaryMessengerResponseHandle* response_handle,
218 FlMethodResponse* response,
219 GError** error) {
220 g_return_val_if_fail(FL_IS_METHOD_CHANNEL(self), FALSE);
221 g_return_val_if_fail(FL_IS_BINARY_MESSENGER_RESPONSE_HANDLE(response_handle),
222 FALSE);
223 g_return_val_if_fail(FL_IS_METHOD_RESPONSE(response), FALSE);
224
225 g_autoptr(GBytes) message =
226 fl_method_codec_encode_response(self->codec, response, error);
227 if (message == nullptr) {
228 return FALSE;
229 }
230 return fl_binary_messenger_send_response(self->messenger, response_handle,
231 message, error);
232 }
G_DEFINE_TYPE
G_DEFINE_TYPE(FlBasicMessageChannelResponseHandle, fl_basic_message_channel_response_handle, G_TYPE_OBJECT) static void fl_basic_message_channel_response_handle_dispose(GObject *object)
Definition: fl_basic_message_channel.cc:37
fl_binary_messenger_send_on_channel_finish
G_MODULE_EXPORT GBytes * fl_binary_messenger_send_on_channel_finish(FlBinaryMessenger *self, GAsyncResult *result, GError **error)
Definition: fl_binary_messenger.cc:449
fl_binary_messenger_set_message_handler_on_channel
G_MODULE_EXPORT void fl_binary_messenger_set_message_handler_on_channel(FlBinaryMessenger *self, const gchar *channel, FlBinaryMessengerMessageHandler handler, gpointer user_data, GDestroyNotify destroy_notify)
Definition: fl_binary_messenger.cc:408
fl_binary_messenger_send_on_channel
G_MODULE_EXPORT void fl_binary_messenger_send_on_channel(FlBinaryMessenger *self, const gchar *channel, GBytes *message, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data)
Definition: fl_binary_messenger.cc:435
fl_binary_messenger_send_response
G_MODULE_EXPORT gboolean fl_binary_messenger_send_response(FlBinaryMessenger *self, FlBinaryMessengerResponseHandle *response_handle, GBytes *response, GError **error)
Definition: fl_binary_messenger.cc:422
args
G_BEGIN_DECLS G_MODULE_EXPORT FlValue * args
Definition: fl_event_channel.h:89
user_data
G_BEGIN_DECLS G_MODULE_EXPORT FlValue gpointer user_data
Definition: fl_event_channel.h:90
fl_method_call_new
FlMethodCall * fl_method_call_new(const gchar *name, FlValue *args, FlMethodChannel *channel, FlBinaryMessengerResponseHandle *response_handle)
Definition: fl_method_call.cc:44
fl_method_call_private.h
message_cb
static void message_cb(FlBinaryMessenger *messenger, const gchar *channel, GBytes *message, FlBinaryMessengerResponseHandle *response_handle, gpointer user_data)
Definition: fl_method_channel.cc:37
fl_method_channel_class_init
static void fl_method_channel_class_init(FlMethodChannelClass *klass)
Definition: fl_method_channel.cc:106
fl_method_channel_init
static void fl_method_channel_init(FlMethodChannel *self)
Definition: fl_method_channel.cc:110
fl_method_channel_invoke_method
G_MODULE_EXPORT void fl_method_channel_invoke_method(FlMethodChannel *self, const gchar *method, FlValue *args, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data)
Definition: fl_method_channel.cc:162
message_response_cb
static void message_response_cb(GObject *object, GAsyncResult *result, gpointer user_data)
Definition: fl_method_channel.cc:63
fl_method_channel_new
G_MODULE_EXPORT FlMethodChannel * fl_method_channel_new(FlBinaryMessenger *messenger, const gchar *name, FlMethodCodec *codec)
Definition: fl_method_channel.cc:112
fl_method_channel_respond
gboolean fl_method_channel_respond(FlMethodChannel *self, FlBinaryMessengerResponseHandle *response_handle, FlMethodResponse *response, GError **error)
Definition: fl_method_channel.cc:215
fl_method_channel_dispose
static void fl_method_channel_dispose(GObject *object)
Definition: fl_method_channel.cc:85
channel_closed_cb
static void channel_closed_cb(gpointer user_data)
Definition: fl_method_channel.cc:71
fl_method_channel_invoke_method_finish
G_MODULE_EXPORT FlMethodResponse * fl_method_channel_invoke_method_finish(FlMethodChannel *self, GAsyncResult *result, GError **error)
Definition: fl_method_channel.cc:192
fl_method_channel_set_method_call_handler
G_MODULE_EXPORT void fl_method_channel_set_method_call_handler(FlMethodChannel *self, FlMethodChannelMethodCallHandler handler, gpointer user_data, GDestroyNotify destroy_notify)
Definition: fl_method_channel.cc:134
fl_method_channel.h
method_call
G_BEGIN_DECLS G_MODULE_EXPORT FlMethodCall * method_call
Definition: fl_method_channel.h:120
fl_method_channel_private.h
fl_method_codec_encode_response
GBytes * fl_method_codec_encode_response(FlMethodCodec *self, FlMethodResponse *response, GError **error)
Definition: fl_method_codec.cc:62
fl_method_codec_encode_method_call
GBytes * fl_method_codec_encode_method_call(FlMethodCodec *self, const gchar *name, FlValue *args, GError **error)
Definition: fl_method_codec.cc:16
fl_method_codec_decode_method_call
gboolean fl_method_codec_decode_method_call(FlMethodCodec *self, GBytes *message, gchar **name, FlValue **args, GError **error)
Definition: fl_method_codec.cc:27
fl_method_codec_decode_response
FlMethodResponse * fl_method_codec_decode_response(FlMethodCodec *self, GBytes *message, GError **error)
Definition: fl_method_codec.cc:88
fl_method_codec_private.h
TRUE
return TRUE
Definition: fl_pixel_buffer_texture_test.cc:53
error
const uint8_t uint32_t uint32_t GError ** error
Definition: fl_pixel_buffer_texture_test.cc:40
FlValue
typedefG_BEGIN_DECLS struct _FlValue FlValue
Definition: fl_value.h:42
_FlMethodChannel
Definition: fl_method_channel.cc:13
_FlMethodChannel::parent_instance
GObject parent_instance
Definition: fl_method_channel.cc:14
_FlMethodChannel::channel_closed
gboolean channel_closed
Definition: fl_method_channel.cc:20
_FlMethodChannel::method_call_handler
FlMethodChannelMethodCallHandler method_call_handler
Definition: fl_method_channel.cc:29
_FlMethodChannel::name
gchar * name
Definition: fl_method_channel.cc:23
_FlMethodChannel::messenger
FlBinaryMessenger * messenger
Definition: fl_method_channel.cc:17
_FlMethodChannel::codec
FlMethodCodec * codec
Definition: fl_method_channel.cc:26
_FlMethodChannel::method_call_handler_destroy_notify
GDestroyNotify method_call_handler_destroy_notify
Definition: fl_method_channel.cc:31
_FlMethodChannel::method_call_handler_data
gpointer method_call_handler_data
Definition: fl_method_channel.cc:30