afm-binding: provide afm as a unique binding

This is the first stone (not fully tested) to
implment the afm-main as a binding. At the end,
this component will replace afm-user-daemon and
afm-system-daemon.

Change-Id: I6eafa7d26800f45ae58dd51aa9ff8008cdb3ff59
Signed-off-by: José Bollo <jose.bollo@iot.bzh>

1 files changed, 487 insertions, 0 deletions

diff --git a/src/afm-binding.c b/src/afm-binding.c
new file mode 100644
index 0000000..b111f09
--- /dev/null
+++ b/src/afm-binding.c
@@ -0,0 +1,487 @@
+/*
+ * Copyright (C) 2015, 2016, 2017 IoT.bzh
+ * Author "Fulup Ar Foll"
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define _GNU_SOURCE         /* See feature_test_macros(7) */
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+
+#include <json-c/json.h>
+
+#define AFB_BINDING_VERSION 2
+#include <afb/afb-binding.h>
+
+#include "verbose.h"
+#include "utils-systemd.h"
+#include "afm.h"
+#include "afm-udb.h"
+#include "afm-urun.h"
+#include "wgt-info.h"
+#include "wgtpkg-install.h"
+#include "wgtpkg-uninstall.h"
+#include "wrap-json.h"
+
+static const char _added_[]     = "added";
+static const char _a_l_c_[]     = "application-list-changed";
+static const char _detail_[]    = "detail";
+static const char _id_[]        = "id";
+static const char _install_[]   = "install";
+static const char _not_found_[] = "not-found";
+static const char _once_[]      = "once";
+static const char _pause_[]     = "pause";
+static const char _resume_[]    = "resume";
+static const char _runid_[]     = "runid";
+static const char _runnables_[] = "runnables";
+static const char _runners_[]   = "runners";
+static const char _start_[]     = "start";
+static const char _state_[]     = "state";
+static const char _terminate_[] = "terminate";
+static const char _uninstall_[] = "uninstall";
+
+static const char *rootdir = FWK_APP_DIR;
+static struct afb_event applist_changed_event;
+static struct afm_udb *afudb;
+static struct json_object *json_true;
+
+static void do_reloads()
+{
+	/* enforce daemon reload */
+	systemd_daemon_reload(0);
+	systemd_unit_restart_name(0, "sockets.target");
+}
+
+static void bad_request(struct afb_req req)
+{
+	afb_req_fail(req, "bad-request", NULL);
+}
+
+static void not_found(struct afb_req req)
+{
+	afb_req_fail(req, _not_found_, NULL);
+}
+
+static void cant_start(struct afb_req req)
+{
+	afb_req_fail(req, "cannot-start", NULL);
+}
+
+/*
+ * Broadcast the event "application-list-changed".
+ * This event is sent was the event "changed" is received from dbus.
+ */
+static void application_list_changed(const char *operation, const char *data)
+{
+	struct json_object *e = NULL;
+	wrap_json_pack(&e, "{ss ss}", "operation", operation, "data", data);
+	afb_event_broadcast(applist_changed_event, e);
+}
+
+/*
+ * retrieves the 'runid' in parameters received with the
+ * request 'req' for the 'method'.
+ *
+ * Returns 1 in case of success.
+ * Otherwise, if the 'runid' can't be retrived, an error stating
+ * the bad request is replied for 'req' and 0 is returned.
+ */
+static int onrunid(struct afb_req req, const char *method, int *runid)
+{
+	struct json_object *json;
+
+	json = afb_req_json(req);
+	if (wrap_json_unpack(json, "s", runid)
+		|| wrap_json_unpack(json, "{ss}", "runid", runid)) {
+		INFO("bad request method %s: %s", method,
+					json_object_to_json_string(json));
+		bad_request(req);
+		return 0;
+	}
+
+	INFO("method %s called for %d", method, *runid);
+	return 1;
+}
+
+/*
+ * Sends the reply 'resp' to the request 'req' if 'resp' is not NULLzero.
+ * Otherwise, when 'resp' is NULL replies the error string 'errstr'.
+ */
+static void reply(struct afb_req req, struct json_object *resp, const char *errstr)
+{
+	if (!resp)
+		afb_req_fail(req, errstr, NULL);
+	else
+		afb_req_success(req, resp, NULL);
+}
+
+/*
+ * Sends the reply "true" to the request 'req' if 'status' is zero.
+ * Otherwise, when 'status' is not zero replies the error string 'errstr'.
+ */
+static void reply_status(struct afb_req req, int status, const char *errstr)
+{
+	reply(req, status ? NULL : json_object_get(json_true), errstr);
+}
+
+/*
+ * On query "runnables"
+ */
+static void runnables(struct afb_req req)
+{
+	struct json_object *resp;
+	INFO("method runnables called");
+	resp = afm_udb_applications_public(afudb);
+	afb_req_success(req, resp, NULL);
+}
+
+/*
+ * On query "detail"
+ */
+static void detail(struct afb_req req)
+{
+	const char *appid;
+	struct json_object *resp, *json;
+
+	/* scan the request */
+	json = afb_req_json(req);
+	if (wrap_json_unpack(json, "s", &appid)
+		|| wrap_json_unpack(json, "{ss}", _id_, &appid)) {
+		bad_request(req);
+		return;
+	}
+
+	/* wants details for appid */
+	INFO("method detail called for %s", appid);
+	resp = afm_udb_get_application_public(afudb, appid);
+	if (resp)
+		afb_req_success(req, resp, NULL);
+	else
+		not_found(req);
+}
+
+/*
+ * On query "start"
+ */
+static void start(struct afb_req req)
+{
+	const char *appid;
+	struct json_object *appli, *resp, *json;
+	int runid;
+
+	/* scan the request */
+	json = afb_req_json(req);
+	if (wrap_json_unpack(json, "s", &appid)
+		|| wrap_json_unpack(json, "{ss}", _id_, &appid)) {
+		bad_request(req);
+		return;
+	}
+
+	/* get the application */
+	INFO("method start called for %s", appid);
+	appli = afm_udb_get_application_private(afudb, appid);
+	if (appli == NULL) {
+		not_found(req);
+		return;
+	}
+
+	/* launch the application */
+	runid = afm_urun_start(appli);
+	if (runid <= 0) {
+		cant_start(req);
+		return;
+	}
+
+	/* returns */
+	resp = NULL;
+	wrap_json_pack(&resp, "{si}", _runid_, runid);
+	afb_req_success(req, resp, NULL);
+}
+
+/*
+ * On query "once"
+ */
+static void once(struct afb_req req)
+{
+	const char *appid;
+	struct json_object *appli, *resp, *json;
+	int runid;
+
+	/* scan the request */
+	json = afb_req_json(req);
+	if (wrap_json_unpack(json, "s", &appid)
+		|| wrap_json_unpack(json, "{ss}", _id_, &appid)) {
+		bad_request(req);
+		return;
+	}
+
+	/* get the application */
+	INFO("method once called for %s", appid);
+	appli = afm_udb_get_application_private(afudb, appid);
+	if (appli == NULL) {
+		not_found(req);
+		return;
+	}
+
+	/* launch the application */
+	runid = afm_urun_once(appli);
+	if (runid <= 0) {
+		cant_start(req);
+		return;
+	}
+
+	/* returns the state */
+	resp = afm_urun_state(afudb, runid);
+	afb_req_success(req, resp, NULL);
+}
+
+/*
+ * On query "pause"
+ */
+static void pause(struct afb_req req)
+{
+	int runid, status;
+	if (onrunid(req, "pause", &runid)) {
+		status = afm_urun_pause(runid);
+		reply_status(req, status, _not_found_);
+	}
+}
+
+/*
+ * On query "resume" from 'smsg' with parameters of 'obj'.
+ */
+static void resume(struct afb_req req)
+{
+	int runid, status;
+	if (onrunid(req, "resume", &runid)) {
+		status = afm_urun_resume(runid);
+		reply_status(req, status, _not_found_);
+	}
+}
+
+/*
+ * On query "terminate"
+ */
+static void terminate(struct afb_req req)
+{
+	int runid, status;
+	if (onrunid(req, "terminate", &runid)) {
+		status = afm_urun_terminate(runid);
+		reply_status(req, status, _not_found_);
+	}
+}
+
+/*
+ * On query "runners"
+ */
+static void runners(struct afb_req req)
+{
+	struct json_object *resp;
+	INFO("method runners called");
+	resp = afm_urun_list(afudb);
+	afb_req_success(req, resp, NULL);
+}
+
+/*
+ * On query "state"
+ */
+static void state(struct afb_req req)
+{
+	int runid;
+	struct json_object *resp;
+	if (onrunid(req, "state", &runid)) {
+		resp = afm_urun_state(afudb, runid);
+		reply(req, resp, _not_found_);
+	}
+}
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+static void install(struct afb_req req)
+{
+	const char *wgtfile;
+	const char *root;
+	int force;
+	int reload;
+	struct wgt_info *ifo;
+	struct json_object *json;
+	struct json_object *resp;
+
+	/* default settings */
+	root = rootdir;
+	force = 0;
+	reload = 1;
+
+	/* scan the request */
+	json = afb_req_json(req);
+	if (wrap_json_unpack(json, "s", &wgtfile)
+		|| wrap_json_unpack(json, "{ss s?s s?b s?b}",
+				"widget", &wgtfile,
+				"root", &root,
+				"force", &force,
+				"reload", &reload)) {
+		return bad_request(req);
+	}
+
+	/* install the widget */
+	ifo = install_widget(wgtfile, root, force);
+	if (ifo == NULL)
+		afb_req_fail_f(req, "failed", "installation failed: %m");
+	else {
+		/* reload if needed */
+		if (reload)
+			do_reloads();
+
+		/* build the response */
+		wrap_json_pack(&resp, "{ss}", _added_, wgt_info_desc(ifo)->idaver);
+		afb_req_success(req, resp, NULL);
+		application_list_changed(_install_, wgt_info_desc(ifo)->idaver);
+
+		/* clean-up */
+		wgt_info_unref(ifo);
+	}
+}
+
+static void uninstall(struct afb_req req)
+{
+	const char *idaver;
+	const char *root;
+	struct json_object *json;
+	int rc;
+
+	/* default settings */
+	root = rootdir;
+
+	/* scan the request */
+	json = afb_req_json(req);
+	if (wrap_json_unpack(json, "s", &idaver)
+		|| wrap_json_unpack(json, "{ss s?s}",
+				_id_, &idaver,
+				"root", &root)) {
+		return bad_request(req);
+	}
+
+	/* install the widget */
+	rc = uninstall_widget(idaver, root);
+	if (rc)
+		afb_req_fail_f(req, "failed", "uninstallation failed: %m");
+	else {
+		afb_req_success(req, NULL, NULL);
+		application_list_changed(_uninstall_, idaver);
+	}
+}
+
+static int init()
+{
+	/* init database */
+	afudb = afm_udb_create(1, 1, "afm-appli-");
+	if (!afudb) {
+		ERROR("afm_udb_create failed");
+		return -1;
+	}
+
+	/* set the systemd's buses */
+	systemd_set_bus(0, afb_daemon_get_system_bus());
+	systemd_set_bus(1, afb_daemon_get_user_bus());
+
+	/* create TRUE */
+	json_true = json_object_new_boolean(1);
+
+	/* create the event */
+	applist_changed_event = afb_daemon_make_event(_a_l_c_);
+	return -!afb_event_is_valid(applist_changed_event);
+}
+
+static const struct afb_auth
+	auth_install = {
+		.type = afb_auth_Permission,
+		.text = "urn:AGL:permission:afm:system:widget:install"
+	},
+	auth_uninstall = {
+		.type = afb_auth_Permission,
+		.text = "urn:AGL:permission:afm:system:widget:uninstall"
+	}
+;
+
+static const struct afb_verb_v2 verbs[] =
+{
+	{_runnables_, runnables, NULL, "Get list of runnable applications",          AFB_SESSION_CHECK_V2 },
+	{_detail_   , detail,    NULL, "Get the details for one application",        AFB_SESSION_CHECK_V2 },
+	{_start_    , start,     NULL, "Start an application",                       AFB_SESSION_CHECK_V2 },
+	{_once_     , once,      NULL, "Start once an application",                  AFB_SESSION_CHECK_V2 },
+	{_terminate_, terminate, NULL, "Terminate a running application",            AFB_SESSION_CHECK_V2 },
+	{_pause_    , pause,     NULL, "Pause a running application",                AFB_SESSION_CHECK_V2 },
+	{_resume_   , resume,    NULL, "Resume a paused application",                AFB_SESSION_CHECK_V2 },
+	{_runners_  , runners,   NULL, "Get the list of running applications",       AFB_SESSION_CHECK_V2 },
+	{_state_    , state,     NULL, "Get the state of a running application",     AFB_SESSION_CHECK_V2 },
+	{_install_  , install,   NULL, "Install an application using a widget file", AFB_SESSION_CHECK_V2 },
+	{_uninstall_, uninstall, NULL, "Uninstall an application",                   AFB_SESSION_CHECK_V2 },
+	{ NULL, NULL, NULL, NULL, 0 }
+};
+
+const struct afb_binding_v2 afbBindingV2 = {
+	.api = "afm-main",
+	.specification = NULL,
+	.info = "Application Framework Master Service",
+	.verbs = verbs,
+	.preinit = NULL,
+	.init = init,
+	.onevent = NULL,
+	.noconcurrency = 1 /* relies on binder for serialisation of requests */
+};
+