PolicyManager uses sd_event loop for the process of check policy

Change-Id: I1e7f7c2085ec30e09a53a67c0ad9c51b2bf53578
Signed-off-by: Yuta Doi <yuta-d@witz-inc.co.jp>

3 files changed, 180 insertions, 86 deletions

diff --git a/src/app.cpp b/src/app.cpp
index 0d727b6..a117848 100644
--- a/src/app.cpp
+++ b/src/app.cpp
@@ -338,7 +338,6 @@ void App::allocateWindowResource(char const *event, char const *drawing_name,
 
     // Check Policy
     json_object* json_in = json_object_new_object();
-    json_object* json_out = json_object_new_object();
     json_object_object_add(json_in, "event", json_object_new_string(event));
 
     if (nullptr != new_role) {
@@ -348,17 +347,10 @@ void App::allocateWindowResource(char const *event, char const *drawing_name,
         json_object_object_add(json_in, "area", json_object_new_string(new_area));
     }
 
-    int ret = this->pm_.checkPolicy(json_in, &json_out);
-    if (0 > ret) {
-        reply("Error checkPolicy()");
-        return;
-    }
-    else {
-        HMI_DEBUG("wm", "result: %s", json_object_get_string(json_out));
-    }
-
-    // Release json_object
-    json_object_put(json_in);
+    // Input event to PolicyManager
+    this->pm_.inputEvent(json_in,
+        [this, new_role, reply] (json_object* json_out) {
+        HMI_DEBUG("wm", "role:%s", new_role);
 
     // Check parking brake state
     json_object* json_parking_brake;
@@ -517,9 +509,10 @@ void App::allocateWindowResource(char const *event, char const *drawing_name,
     else {
         HMI_DEBUG("wm", "All layer is NOT changed!!");
     }
+});
 
     // Release json_object
-    json_object_put(json_out);
+    json_object_put(json_in);
 
     return;
 }
diff --git a/src/policy_manager/policy_manager.cpp b/src/policy_manager/policy_manager.cpp
index 648c681..351c7ce 100644
--- a/src/policy_manager/policy_manager.cpp
+++ b/src/policy_manager/policy_manager.cpp
@@ -18,6 +18,8 @@
 #include <fstream>
 #include <sstream>
 #include <istream>
+#include <thread>
+#include <systemd/sd-event.h>
 #include <json-c/json.h>
 #include "policy_manager.hpp"
 #include "hmi-debug.h"
@@ -29,6 +31,19 @@ extern "C" {
 } // namespace stm
 
 
+namespace pm {
+struct EventData {
+    explicit EventData(int event, PolicyManager::Handler handler) {
+        this->event = event;
+        this->handler = handler;
+    };
+    ~EventData() = default;
+
+    int event;
+    PolicyManager::Handler handler;
+};
+}  // namespace pm
+
 PolicyManager::PolicyManager() :
   eventname2no_(),
   categoryname2no_(),
@@ -62,7 +77,7 @@ int PolicyManager::initialize() {
     }
 
     // Load role.db
-    ret = loadRoleDb();
+    ret = this->loadRoleDb();
     if (0 > ret) {
         HMI_ERROR("wm:pm", "Load role.db Error!!");
         return ret;
@@ -71,65 +86,66 @@ int PolicyManager::initialize() {
     // Initialize StateTransitioner
     stm::stmInitialize();
 
+    // Initialize sd_event loop
+    ret = this->initializeSdEventLoop();
+    if (0 > ret) {
+        HMI_ERROR("wm:pm", "Failed to initializeSdEventLoop!!");
+        return ret;
+    }
+
     return ret;
 }
 
-int PolicyManager::checkPolicy(json_object* json_in, json_object** json_out) {
-    HMI_DEBUG("wm:pm", "Call");
-
-    // Check arguments
-    if ((nullptr == json_in) || (nullptr == json_out)) {
-        HMI_ERROR("wm:pm", "Argument is NULL!!");
+int PolicyManager::initializeSdEventLoop() {
+    // Get default event loop object
+    int ret = sd_event_new(&(this->sd_event_));
+    if (0 > ret) {
+        HMI_ERROR("wm:pm", "Faild to sd_event_default: errno:%d", ret);
         return -1;
     }
 
-    // Get event from json_object
-    const char* event = this->getStringFromJson(json_in, "event");
-    int event_no = 0;
-    if (nullptr != event) {
-        // Convert name to number
-        event_no = this->eventname2no_[event];
-        HMI_DEBUG("wm:pm", "event(%s:%d)", event, event_no);
-    }
-
-    // Get role from json_object
-    const char* role = this->getStringFromJson(json_in, "role");
-    int category_no = 0;
-    if (nullptr != role) {
-        HMI_DEBUG("wm:pm", "role(%s)", role);
-
-        // Convert role to category
-        const char* category = this->role2category_[role].c_str();
-        if (0 == strcmp("", category)) {
-            HMI_ERROR("wm:pm", "Error!!");
-            return -1;
+    // Create thread for sd_event and detach
+    std::thread sd_event_loop([this]() {
+        while (1) {
+            sd_event_run(this->sd_event_, 1000);
         }
-        HMI_DEBUG("wm:pm", "category(%s)", category);
+    });
+    sd_event_loop.detach();
 
-        // Convert name to number
-        category_no = categoryname2no_[category];
-        HMI_DEBUG("wm:pm", "role(%s), category(%s:%d)", role, category, category_no);
+    return 0;
+}
+
+static void addStateToJson(
+  const char* key, int is_changed, const char* state, json_object** json_out) {
+    if ((nullptr == key) || (nullptr == state) || (nullptr == json_out)) {
+        HMI_ERROR("wm:pm", "Argument is nullptr!!!");
+        return;
     }
 
-    // Get areat from json_object
-    const char* area = this->getStringFromJson(json_in, "area");
-    int area_no = 0;
-    if (nullptr != area) {
-        // Convert name to number
-        area_no = areaname2no_[area];
-        HMI_DEBUG("wm:pm", "area(%s:%d)", area, area_no);
+    json_object* json_obj = json_object_new_object();
+    json_object_object_add(json_obj, "is_changed", json_object_new_boolean(is_changed));
+    if (is_changed) {
+        HMI_DEBUG("wm:pm", "%s: state changed (%s)", key, state);
+        json_object_object_add(json_obj, "state", json_object_new_string(state));
     }
+    json_object_object_add(*json_out, key, json_obj);
+}
 
-    HMI_DEBUG("wm:pm", "set event:0x%x", (event_no | category_no | area_no));
+static int checkPolicy(sd_event_source *source, uint64_t usec, void *data) {
+    HMI_DEBUG("wm:pm", "Call");
+
+    pm::EventData *event_data = (pm::EventData*)data;
 
     // Transition state
     stm::stm_state_t crr_state;
-    int ret = stm::stmTransitionState((event_no | category_no | area_no), &crr_state);
+    int ret = stm::stmTransitionState(event_data->event, &crr_state);
     if (0 > ret) {
         HMI_ERROR("wm:pm", "Error!!");
         return -1;
     }
 
+    json_object* json_out = json_object_new_object();
+
     // Create result
     // {
     //     "parking_brake": {
@@ -140,10 +156,10 @@ int PolicyManager::checkPolicy(json_object* json_in, json_object** json_out) {
               crr_state.parking_brake.is_changed,
               crr_state.parking_brake.state,
               stm::gStmParkingBrakeStateNo2Name[crr_state.parking_brake.state]);
-    this->addStateToJson("parking_brake",
+    addStateToJson("parking_brake",
                          crr_state.parking_brake.is_changed,
                          stm::gStmParkingBrakeStateNo2Name[crr_state.parking_brake.state],
-                         json_out);
+                         &json_out);
 
     //     "accel_pedal": {
     //         "is_changed": <bool>,
@@ -153,10 +169,10 @@ int PolicyManager::checkPolicy(json_object* json_in, json_object** json_out) {
               crr_state.accel_pedal.is_changed,
               crr_state.accel_pedal.state,
               stm::gStmAccelPedalStateNo2Name[crr_state.accel_pedal.state]);
-    this->addStateToJson("accel_pedal",
+    addStateToJson("accel_pedal",
                          crr_state.accel_pedal.is_changed,
                          stm::gStmAccelPedalStateNo2Name[crr_state.accel_pedal.state],
-                         json_out);
+                         &json_out);
 
     //     "lightstatus_brake": {
     //         "is_changed": <bool>,
@@ -166,10 +182,10 @@ int PolicyManager::checkPolicy(json_object* json_in, json_object** json_out) {
               crr_state.lightstatus_brake.is_changed,
               crr_state.lightstatus_brake.state,
               stm::gStmLightstatusBrakeStateNo2Name[crr_state.lightstatus_brake.state]);
-    this->addStateToJson("lightstatus_brake",
+    addStateToJson("lightstatus_brake",
                          crr_state.lightstatus_brake.is_changed,
                          stm::gStmLightstatusBrakeStateNo2Name[crr_state.lightstatus_brake.state],
-                         json_out);
+                         &json_out);
 
     //     "car": {
     //         "is_changed": <bool>,
@@ -179,10 +195,10 @@ int PolicyManager::checkPolicy(json_object* json_in, json_object** json_out) {
               crr_state.car.is_changed,
               crr_state.car.state,
               stm::gStmCarStateNo2Name[crr_state.car.state]);
-    this->addStateToJson("car",
+    addStateToJson("car",
                          crr_state.car.is_changed,
                          stm::gStmCarStateNo2Name[crr_state.car.state],
-                         json_out);
+                         &json_out);
 
     //     "lamp": {
     //         "is_changed": <bool>,
@@ -192,10 +208,10 @@ int PolicyManager::checkPolicy(json_object* json_in, json_object** json_out) {
               crr_state.lamp.is_changed,
               crr_state.lamp.state,
               stm::gStmLampStateNo2Name[crr_state.lamp.state]);
-    this->addStateToJson("lamp",
+    addStateToJson("lamp",
                          crr_state.lamp.is_changed,
                          stm::gStmLampStateNo2Name[crr_state.lamp.state],
-                         json_out);
+                         &json_out);
 
     //     "layers": [
     json_object* json_layer = json_object_new_array();
@@ -214,7 +230,7 @@ int PolicyManager::checkPolicy(json_object* json_in, json_object** json_out) {
               crr_state.layer.homescreen.state,
               stm::gStmLayoutNo2Name[crr_state.layer.homescreen.state]);
     json_tmp = json_object_new_object();
-    this->addStateToJson("homescreen",
+    addStateToJson("homescreen",
                          crr_state.layer.homescreen.is_changed,
                          stm::gStmLayoutNo2Name[crr_state.layer.homescreen.state],
                          &json_tmp);
@@ -231,7 +247,7 @@ int PolicyManager::checkPolicy(json_object* json_in, json_object** json_out) {
               crr_state.layer.apps.state,
               stm::gStmLayoutNo2Name[crr_state.layer.apps.state]);
     json_tmp = json_object_new_object();
-    this->addStateToJson("apps",
+    addStateToJson("apps",
                          crr_state.layer.apps.is_changed,
                          stm::gStmLayoutNo2Name[crr_state.layer.apps.state],
                          &json_tmp);
@@ -248,7 +264,7 @@ int PolicyManager::checkPolicy(json_object* json_in, json_object** json_out) {
               crr_state.layer.restriction.state,
               stm::gStmLayoutNo2Name[crr_state.layer.restriction.state]);
     json_tmp = json_object_new_object();
-    this->addStateToJson("restriction",
+    addStateToJson("restriction",
                          crr_state.layer.restriction.is_changed,
                          stm::gStmLayoutNo2Name[crr_state.layer.restriction.state],
                          &json_tmp);
@@ -265,14 +281,105 @@ int PolicyManager::checkPolicy(json_object* json_in, json_object** json_out) {
               crr_state.layer.on_screen.state,
               stm::gStmLayoutNo2Name[crr_state.layer.on_screen.state]);
     json_tmp = json_object_new_object();
-    this->addStateToJson("on_screen",
+    addStateToJson("on_screen",
                          crr_state.layer.on_screen.is_changed,
                          stm::gStmLayoutNo2Name[crr_state.layer.on_screen.state],
                          &json_tmp);
     json_object_array_add(json_layer, json_tmp);
 
     // Add json array of layer
-    json_object_object_add(*json_out, "layers", json_layer);
+    json_object_object_add(json_out, "layers", json_layer);
+
+    // Call event handler
+    event_data->handler(json_out);
+
+    // Release json_object
+    json_object_put(json_out);
+
+    // Release data
+    delete (pm::EventData*)data;
+
+    // Destroy sd_event_soutce object
+    sd_event_source_unref(source);
+
+    return 0;
+}
+
+void PolicyManager::checkPolicyEntry(int event, int delay_ms, PolicyManager::Handler handler)
+{
+    HMI_DEBUG("wm:pm", "Call");
+
+    // Create event data
+    pm::EventData *event_data = new pm::EventData(event, handler);
+
+    // Get current time
+    struct timespec time_spec;
+    clock_gettime(CLOCK_MONOTONIC, &time_spec);
+
+    // Calculate timer fired time
+    uint64_t usec = (time_spec.tv_sec * 1000000)
+                    + (time_spec.tv_nsec / 1000)
+                    + (delay_ms * 1000);
+
+    // Set timer
+    int ret = sd_event_add_time(this->sd_event_, NULL, CLOCK_MONOTONIC, usec, 1,
+                                &checkPolicy, event_data);
+    if (0 > ret) {
+        HMI_ERROR("wm:pm", "Faild to sd_event_add_time: errno:%d", ret);
+        return;
+    }
+}
+
+int PolicyManager::inputEvent(json_object* json_in, PolicyManager::Handler notify_state) {
+    HMI_DEBUG("wm:pm", "Call");
+
+    // Check arguments
+    if (nullptr == json_in) {
+        HMI_ERROR("wm:pm", "Argument is NULL!!");
+        return -1;
+    }
+
+    // Get event from json_object
+    const char* event = this->getStringFromJson(json_in, "event");
+    int event_no = 0;
+    if (nullptr != event) {
+        // Convert name to number
+        event_no = this->eventname2no_[event];
+        HMI_DEBUG("wm:pm", "event(%s:%d)", event, event_no);
+    }
+
+    // Get role from json_object
+    const char* role = this->getStringFromJson(json_in, "role");
+    int category_no = 0;
+    if (nullptr != role) {
+        HMI_DEBUG("wm:pm", "role(%s)", role);
+
+        // Convert role to category
+        const char* category = this->role2category_[role].c_str();
+        if (0 == strcmp("", category)) {
+            HMI_ERROR("wm:pm", "Error!!");
+            return -1;
+        }
+        HMI_DEBUG("wm:pm", "category(%s)", category);
+
+        // Convert name to number
+        category_no = categoryname2no_[category];
+        HMI_DEBUG("wm:pm", "role(%s), category(%s:%d)", role, category, category_no);
+    }
+
+    // Get areat from json_object
+    const char* area = this->getStringFromJson(json_in, "area");
+    int area_no = 0;
+    if (nullptr != area) {
+        // Convert name to number
+        area_no = areaname2no_[area];
+        HMI_DEBUG("wm:pm", "area(%s:%d)", area, area_no);
+    }
+
+    HMI_DEBUG("wm:pm", "set event:0x%x", (event_no | category_no | area_no));
+
+    // Check policy
+    this->checkPolicyEntry((event_no | category_no | area_no), 0, notify_state);
 
     return 0;
 }
@@ -447,22 +554,6 @@ int PolicyManager::inputJsonFilie(const char* file, json_object** obj) {
     return ret;
 }
 
-void PolicyManager::addStateToJson(
-  const char* key, int is_changed, const char* state, json_object** json_out) {
-    if ((nullptr == key) || (nullptr == state) || (nullptr == json_out)) {
-        HMI_ERROR("wm:pm", "Argument is nullptr!!!");
-        return;
-    }
-
-    json_object* json_obj = json_object_new_object();
-    json_object_object_add(json_obj, "is_changed", json_object_new_boolean(is_changed));
-    if (is_changed) {
-        HMI_DEBUG("wm:pm", "%s: state changed (%s)", key, state);
-        json_object_object_add(json_obj, "state", json_object_new_string(state));
-    }
-    json_object_object_add(*json_out, key, json_obj);
-}
-
 std::vector<std::string> PolicyManager::parseString(std::string str, char delimiter) {
     // Parse string by delimiter
     std::vector<std::string> vct;
diff --git a/src/policy_manager/policy_manager.hpp b/src/policy_manager/policy_manager.hpp
index 787a3ec..57856dc 100644
--- a/src/policy_manager/policy_manager.hpp
+++ b/src/policy_manager/policy_manager.hpp
@@ -23,6 +23,7 @@
 
 
 struct json_object;
+struct sd_event;
 
 class PolicyManager {
 
@@ -30,9 +31,13 @@ public:
     explicit PolicyManager();
     ~PolicyManager() = default;
 
+    using Handler = std::function<void(json_object *)>;
+
     int initialize();
-    int checkPolicy(json_object* json_in, json_object** json_out);
+    void setEventHandler(PolicyManager::Handler handler);
+    int inputEvent(json_object* json_in, PolicyManager::Handler notify_state);
     std::string roleToCategory(const char* role);
+
 private:
     // Disable copy and move
     PolicyManager(PolicyManager const &) = delete;
@@ -49,14 +54,19 @@ private:
     std::unordered_map<std::string, std::string> category2role_;
     std::unordered_map<std::string, std::string> role2defaultarea_;
 
+    struct sd_event* sd_event_;
+
+    int initializeSdEventLoop();
+    void checkPolicyEntry(int event, int delay_ms, PolicyManager::Handler handler);
+
     // Load role.db
     int loadRoleDb();
 
     const char* getStringFromJson(json_object* obj, const char* key);
     int inputJsonFilie(const char* file, json_object** obj);
-    void addStateToJson(const char* key, int is_changed, const char* state, json_object** json_out);
     std::vector<std::string> parseString(std::string str, char delimiter);
     std::string deleteSpace(std::string str);
+
 };