Add signal-composer voice event support

Add support for triggering listening (push-to-talk/PTT) via the
signal-composer "event.voice" event.  This enables PTT from the
steering wheel for the CES demo.

Note that this relies on a fix to signal-composer to add the
session context uuid to the replies from event subscribe calls.
Without that, it's not feasible to catch the signal-composer
events with the libappcontroller event scheme and some more
significant rework would be required.

Bug-AGL: SPEC-3048

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: I22c7265c2f08ecc0a598fd88ddf4fd53f8c3e880

2 files changed, 110 insertions, 0 deletions

diff --git a/src/plugins/VshlCoreApi.cpp b/src/plugins/VshlCoreApi.cpp
index abe4577..b14f949 100644
--- a/src/plugins/VshlCoreApi.cpp
+++ b/src/plugins/VshlCoreApi.cpp
@@ -66,6 +66,11 @@ static std::unique_ptr<vshlcore::utilities::events::EventRouter> sEventRouter;
 using json = nlohmann::json;
 using Level = vshlcore::utilities::logging::Logger::Level;
 
+static const char *signalcomposer_events[] = {
+    "event.voice",
+    NULL,
+};
+
 CTLP_ONLOAD(plugin, ret) {
     if (plugin->api == nullptr) {
         return -1;
@@ -195,6 +200,29 @@ CTLP_CAPI(onLoginPairExpiredEvent, source, argsJ, eventJ) {
     return 0;
 }
 
+CTLP_CAPI(onVoiceTriggerEvent, source, argsJ, eventJ) {
+    if (sVRRequestProcessor == nullptr) {
+        return -1;
+    }
+
+    json eventJson = json::parse(json_object_to_json_string(eventJ));
+    if (eventJson.find("uid") == eventJson.end()) {
+        sLogger->log(Level::ERROR, TAG, "onVoiceTriggerEvent: No uid found.");
+        return -1;
+    }
+    if (eventJson.find("value") == eventJson.end()) {
+        sLogger->log(Level::ERROR, TAG, "onVoiceTriggerEvent: No value found.");
+        return -1;
+    }
+    std::string uid(eventJson["uid"].get<std::string>());
+    bool value(eventJson["value"].get<bool>());
+    if (uid == "event.voice" && value == true) {
+        sVRRequestProcessor->startListening();
+    }
+
+    return 0;
+}
+
 // Helper function to add events for voice agent to controller
 // configuration.  It relies on the controller configuration being
 // available via the userdata of the API pointer.
@@ -406,6 +434,86 @@ CTLP_CAPI(loadVoiceAgentsConfig, source, argsJ, eventJ) {
     return 0;
 }
 
+// Helper function to add signal composer events for voice triggers to
+// controller configuration.  It relies on the controller configuration
+// being available via the userdata of the API pointer.
+static int AddVoiceTriggerEvents(std::string &agentApi, std::string &uuid) {
+    // Retrieve section config from api handle
+    CtlConfigT *ctrlConfig = (CtlConfigT*) afb_api_get_userdata(sAfbApi->getApi());
+    if (ctrlConfig == nullptr) {
+        sLogger->log(Level::ERROR, TAG, "AddVoiceAgentEvents: ctrlConfig == nullptr");
+        return -1;
+    }
+
+    CtlSectionT* section = nullptr;
+    for (int idx = 0; ctrlConfig->sections[idx].key != NULL; ++idx) {
+        if (!strcasecmp(ctrlConfig->sections[idx].key, "events")) {
+            section = &(ctrlConfig->sections[idx]);
+            break;
+        }
+    }
+    if (section == nullptr) {
+        sLogger->log(Level::ERROR, TAG, "AddVoiceTriggerEvents: events section not found");
+        return -1;
+    }
+
+    // Fill out events JSON array to pass to the controller
+    json_object* eventsJ = json_object_new_array();
+
+    json_object *eventJ = json_object_new_object();
+    std::string uid = agentApi + "/" + uuid;
+    json_object *uidJ = json_object_new_string(uid.c_str());
+    json_object_object_add(eventJ, "uid", uidJ);
+    json_object *actionJ = json_object_new_string("plugin://vshl-core#onVoiceTriggerEvent");
+    json_object_object_add(eventJ, "action", actionJ);
+    json_object_array_add(eventsJ, eventJ);
+
+    // Call into controller to add event actions
+    // NOTE: AFAICT the JSON objects end up reused by the controller data
+    //       structures, so eventsJ should not be freed with a put after
+    //       this call.
+    int rc = AddActionsToSection(sAfbApi->getApi(), section, eventsJ, 0);
+    if (rc != 0) {
+        stringstream message;
+        message << "AddVoiceTriggerEvents: AddActionsToSection rc = " << rc;
+        sLogger->log(Level::WARNING, TAG, message.str().c_str());
+    }
+    return rc;
+}
+
+CTLP_CAPI(subscribeVoiceTriggerEvents, source, argsJ, eventJ) {
+    // Subscribe to signal-composer voice/PTT events
+    const char **tmp = signalcomposer_events;
+    json_object *args = json_object_new_object();
+    json_object *signals = json_object_new_array();
+
+    while (*tmp) {
+        json_object_array_add(signals, json_object_new_string(*tmp++));
+    }
+    json_object_object_add(args, "signal", signals);
+    if (json_object_array_length(signals)) {
+        struct json_object *responseJ;
+        int rc = afb_api_call_sync(sAfbApi->getApi(), "signal-composer",
+                                   "subscribe", args, &responseJ, NULL, NULL);
+        if (rc == 0 && responseJ) {
+            struct json_object *uuidJ;
+            json_object_object_get_ex(responseJ, "uuid", &uuidJ);
+            if (uuidJ) {
+                std::string uuid(json_object_get_string(uuidJ));
+		std::string api("signal-composer");
+		AddVoiceTriggerEvents(api, uuid);
+            }
+        }
+	if (responseJ)
+            json_object_put(responseJ);
+    } else {
+        json_object_put(args);
+    }
+
+    // Always return zero so service will start
+    return 0;
+}
+
 CTLP_CAPI(startListening, source, argsJ, eventJ) {
     if (sVoiceAgentsDataManager == nullptr) {
         return -1;
diff --git a/src/plugins/VshlCoreApi.h b/src/plugins/VshlCoreApi.h
index eb90190..7c5bf69 100644
--- a/src/plugins/VshlCoreApi.h
+++ b/src/plugins/VshlCoreApi.h
@@ -29,7 +29,9 @@ int onConnectionStateEvent(CtlSourceT* source, json_object* argsJ, json_object*
 int onDialogStateEvent(CtlSourceT* source, json_object* argsJ, json_object* queryJ);
 int onLoginPairReceivedEvent(CtlSourceT* source, json_object* argsJ, json_object* queryJ);
 int onLoginPairExpiredEvent(CtlSourceT* source, json_object* argsJ, json_object* queryJ);
+int onVoiceTriggerEvent(CtlSourceT* source, json_object* argsJ, json_object* queryJ);
 int loadVoiceAgentsConfig(CtlSourceT* source, json_object* argsJ, json_object* queryJ);
+int subscribeVoiceTriggerEvents(CtlSourceT* source, json_object* argsJ, json_object* queryJ);
 int startListening(CtlSourceT* source, json_object* argsJ, json_object* queryJ);
 int cancelListening(CtlSourceT* source, json_object* argsJ, json_object* queryJ);
 int enumerateVoiceAgents(CtlSourceT* source, json_object* argsJ, json_object* queryJ);