ARI: Implement device state API

Created a data model and implemented functionality for an ARI device state
resource.  The following operations have been added that allow a user to
manipulate an ARI controlled device:

Create/Change the state of an ARI controlled device
PUT    /deviceStates/{deviceName}&{deviceState}

Retrieve all ARI controlled devices
GET    /deviceStates

Retrieve the current state of a device
GET    /deviceStates/{deviceName}

Destroy a device-state controlled by ARI
DELETE /deviceStates/{deviceName}

The ARI controlled device must begin with 'Stasis:'.  An example controlled
device name would be Stasis:Example.  A 'DeviceStateChanged' event has also
been added so that an application can subscribe and receive device change
events.  Any device state, ARI controlled or not, can be subscribed to.

While adding the event, the underlying subscription control mechanism was
refactored so that all current and future resource subscriptions would be
the same.  Each event resource must now register itself in order to be able
to properly handle [un]subscribes.

(issue ASTERISK-22838)
Reported by: Matt Jordan
Review: https://reviewboard.asterisk.org/r/3025/
........

Merged revisions 403134 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@403135 65c4cc65-6c06-0410-ace0-fbb531ad65f3

1 files changed, 111 insertions, 0 deletions

diff --git a/res/ari/resource_device_states.c b/res/ari/resource_device_states.c
new file mode 100644
index 000000000..50b876740
--- /dev/null
+++ b/res/ari/resource_device_states.c
@@ -0,0 +1,111 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 2012 - 2013, Digium, Inc.
+ *
+ * Kevin Harwell <kharwell@digium.com>
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*! \file
+ *
+ * \brief /api-docs/deviceStates.{format} implementation- Device state resources
+ *
+ * \author Kevin Harwell <kharwell@digium.com>
+ */
+
+#include "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#include "resource_device_states.h"
+#include "asterisk/stasis_app_device_state.h"
+
+void ast_ari_device_states_list(
+	struct ast_variable *headers,
+	struct ast_ari_device_states_list_args *args,
+	struct ast_ari_response *response)
+{
+	RAII_VAR(struct ast_json *, json, NULL, ast_json_unref);
+
+	if (!(json = stasis_app_device_states_to_json())) {
+		ast_ari_response_error(response, 500,
+			"Internal Server Error", "Error building response");
+		return;
+	}
+
+	ast_ari_response_ok(response, json);
+}
+
+void ast_ari_device_states_get(struct ast_variable *headers,
+	struct ast_ari_device_states_get_args *args,
+	struct ast_ari_response *response)
+{
+	RAII_VAR(struct ast_json *, json, NULL, ast_json_unref);
+
+	if (!(json = stasis_app_device_state_to_json(
+		      args->device_name, ast_device_state(args->device_name)))) {
+		ast_ari_response_error(response, 500,
+			"Internal Server Error", "Error building response");
+		return;
+	}
+
+	ast_ari_response_ok(response, json);
+}
+
+void ast_ari_device_states_update(struct ast_variable *headers,
+	struct ast_ari_device_states_update_args *args,
+	struct ast_ari_response *response)
+{
+	switch (stasis_app_device_state_update(
+			args->device_name, args->device_state)) {
+	case STASIS_DEVICE_STATE_NOT_CONTROLLED:
+		ast_ari_response_error(response, 409,
+			"Conflict", "Uncontrolled device specified");
+		return;
+	case STASIS_DEVICE_STATE_MISSING:
+		ast_ari_response_error(response, 404,
+			"Not Found", "Device name is missing");
+		return;
+	case STASIS_DEVICE_STATE_UNKNOWN:
+		ast_ari_response_error(response, 500, "Internal Server Error",
+				       "Unknown device");
+		return;
+	case STASIS_DEVICE_STATE_OK:
+	case STASIS_DEVICE_STATE_SUBSCRIBERS: /* shouldn't be returned for update */
+		ast_ari_response_no_content(response);
+	}
+}
+
+void ast_ari_device_states_delete(struct ast_variable *headers,
+	struct ast_ari_device_states_delete_args *args,
+	struct ast_ari_response *response)
+{
+	switch (stasis_app_device_state_delete(args->device_name)) {
+	case STASIS_DEVICE_STATE_NOT_CONTROLLED:
+		ast_ari_response_error(response, 409,
+			"Conflict", "Uncontrolled device specified");
+		return;
+	case STASIS_DEVICE_STATE_MISSING:
+		ast_ari_response_error(response, 404,
+			"Not Found", "Device name is missing");
+		return;
+	case STASIS_DEVICE_STATE_SUBSCRIBERS:
+		ast_ari_response_error(response, 500,
+			"Internal Server Error",
+			"Cannot delete device with subscribers");
+		return;
+	case STASIS_DEVICE_STATE_OK:
+	case STASIS_DEVICE_STATE_UNKNOWN:
+		ast_ari_response_no_content(response);
+	}
+}