some ideas of updates delivery

handler/addasset.cpp

@@ -53,13 +53,11 @@ void Handler::AddAsset::handle (Request& request) {
         asset.owner = session.owner;
         asset = srv->getDatabase()->addAsset(asset);
 
-        nlohmann::json body = nlohmann::json::object();
-        body["asset"] = asset.toJSON();
-
         Response& res = request.createResponse(Response::Status::ok);
-        res.setBody(body);
         res.send();
 
+        session.assetAdded(asset);
+
     } catch (const DB::NoSession& e) {
         return error(request, Response::Status::unauthorized);
     } catch (const std::exception& e) {

request/request.cpp

@@ -11,6 +11,7 @@ constexpr static const char* SERVER_NAME("SERVER_NAME");
 constexpr static const char* CONTENT_TYPE("CONTENT_TYPE");
 constexpr static const char* CONTENT_LENGTH("CONTENT_LENGTH");
 constexpr static const char* AUTHORIZATION("HTTP_AUTHORIZATION");
+constexpr static const char* QUERY_STRING("QUERY_STRING");
 
 constexpr static const char* urlEncoded("application/x-www-form-urlencoded");
 
@@ -33,7 +34,8 @@ Request::Request ():
     state(State::initial),
     raw(),
     response(nullptr),
-    path()
+    path(),
+    cachedMethod(Method::unknown)
 {}
 
 Request::~Request() {
@@ -68,10 +70,15 @@ std::string_view Request::methodName() const {
 }
 
 Request::Method Request::method() const {
+    if (cachedMethod != Method::unknown)
+        return cachedMethod;
+
     std::string_view method = methodName();
     for (const auto& pair : methods) {
-        if (pair.first == method)
+        if (pair.first == method) {
+            cachedMethod = pair.second;
             return pair.second;
+        }
     }
 
     return Request::Method::unknown;
@@ -227,20 +234,36 @@ unsigned int Request::contentLength() const {
     if (!active())
         throw std::runtime_error("An attempt to read content length of a request in a wrong state");
 
-    return atoi(FCGX_GetParam(CONTENT_LENGTH, raw.envp));
+    char* cl = FCGX_GetParam(CONTENT_LENGTH, raw.envp);
+    if (cl != nullptr)
+        return atoi(cl);
+    else
+        return 0;
 }
 
 std::map<std::string, std::string> Request::getForm() const {
     if (!active())
         throw std::runtime_error("An attempt to read form of a request in a wrong state");
 
+    switch (Request::method()) {
+        case Method::get:
+            return urlDecodeAndParse(FCGX_GetParam(QUERY_STRING, raw.envp));
+            break;
+        case Method::post:
+            return getFormPOST();
+        default:
+            return {};
+    }
+}
+
+std::map<std::string, std::string> Request::getFormPOST () const {
     std::map<std::string, std::string> result;
     std::string_view contentType(FCGX_GetParam(CONTENT_TYPE, raw.envp));
     if (contentType.empty())
         return result;
 
-    unsigned int length = contentLength();
     if (contentType.find(urlEncoded) != std::string_view::npos) {
+        unsigned int length = contentLength();
         std::string postData(length, '\0');
         FCGX_GetStr(&postData[0], length, raw.in);
         result = urlDecodeAndParse(postData);

request/request.h

@@ -69,10 +69,12 @@ private:
     OStream getErrorStream();
     void responseIsComplete();
     void terminate();
+    std::map<std::string, std::string> getFormPOST() const;
 
 private:
     State state;
     FCGX_Request raw;
     std::unique_ptr<Response> response;
     std::string path;
+    mutable Method cachedMethod;
 };

run.sh.in

@@ -7,7 +7,7 @@ start_service() {
   if (systemctl is-active --quiet $1) then
     echo "$1 is already running"
   else
-    echo "$1 is not running, going to use \"sudo systemctl start $1\""
+    echo "$1 is not running, going to use sudo to start it"
     if (sudo systemctl start $1) then
       echo "$1 started"
     else
@@ -17,6 +17,7 @@ start_service() {
 }
 
 if [ ! -d "/run/pica" ]; then
+  echo "reuired unix socket was not found, going to use sudo to create it"
   sudo mkdir /run/pica
   sudo chown $USER:$USER /run/pica
 fi

server/session.cpp

@@ -20,7 +20,9 @@ Session::Session(
     renew(renew),
     polling(nullptr),
     timeoutId(TM::Scheduler::none),
-    timeout(timeout)
+    timeout(timeout),
+    mtx(),
+    cache()
 {}
 
 Session::~Session () {
@@ -39,6 +41,7 @@ std::string Session::getRenewToken() const {
 }
 
 void Session::accept(std::unique_ptr<Request> request) {
+    std::lock_guard lock(mtx);
     std::shared_ptr<TM::Scheduler> sch = scheduler.lock();
     if (polling) {
         if (timeoutId != TM::Scheduler::none) {
@@ -51,17 +54,67 @@ void Session::accept(std::unique_ptr<Request> request) {
         polling.reset();
     }
 
+    std::map form = request->getForm();
+    auto clear = form.find("clearCache");
+    if (clear != form.end() && clear->second == "all")
+        cache.clear();
+
+    if (!cache.empty())
+        return sendUpdates(std::move(request));
+
     if (!sch) {
         std::cerr << "Was unable to schedule polling timeout, replying with an error" << std::endl;
         Handler::Poll::error(*request.get(), Handler::Poll::Result::unknownError, Response::Status::internalError);
         return;
     }
+
     timeoutId = sch->schedule(std::bind(&Session::onTimeout, this), timeout);
     polling = std::move(request);
 }
 
+void Session::sendUpdates (std::unique_ptr<Request> request) {
+    Response& res = request->createResponse(Response::Status::ok);
+    nlohmann::json body = nlohmann::json::object();
+    body["result"] = Handler::Poll::Result::success;
+    nlohmann::json& data = body["data"] = nlohmann::json::object();
+
+    for (const auto& category : cache) {
+        nlohmann::json& cat = data[category.first] = nlohmann::json::object();
+        for (const auto& entry : category.second)
+            cat[entry.first] = entry.second;
+    }
+
+    res.setBody(body);
+    res.send();
+}
+
 void Session::onTimeout () {
+    std::lock_guard lock(mtx);
     timeoutId = TM::Scheduler::none;
     Handler::Poll::error(*polling.get(), Handler::Poll::Result::timeout, Response::Status::ok);
     polling.reset();
 }
+
+void Session::assetAdded (const DB::Asset& asset) {
+    std::lock_guard lock(mtx);
+    auto assets = cache["assets"];
+    auto addedItr = assets.find("added");
+    if (addedItr == assets.end())
+        addedItr = assets.emplace("added", nlohmann::json::array()).first;
+
+    addedItr->second.push_back(asset.toJSON());
+    checkUpdates();
+}
+
+void Session::checkUpdates () {
+    std::shared_ptr<TM::Scheduler> sch = scheduler.lock();
+    if (polling) {
+        if (timeoutId != TM::Scheduler::none) {
+            if (sch)
+                sch->cancel(timeoutId);
+
+            timeoutId = TM::Scheduler::none;
+        }
+        sendUpdates(std::move(polling));
+    }
+}

server/session.h

@@ -4,13 +4,19 @@
 #pragma once
 
 #include <string>
+#include <map>
+#include <mutex>
+
+#include <nlohmann/json.hpp>
 
 #include "request/accepting.h"
 #include "taskmanager/scheduler.h"
 
+#include "database/schema/asset.h"
+
 class Session : public Accepting {
 public:
-    Session(
+    Session (
         std::weak_ptr<TM::Scheduler> scheduler,
         unsigned int id,
         unsigned int owner,
@@ -18,21 +24,25 @@ public:
         const std::string& renew,
         unsigned int timeout
     );
-    Session(const Session&) = delete;
-    Session(Session&& other) = delete;
-    ~Session();
+    Session (const Session&) = delete;
+    Session (Session&& other) = delete;
+    ~Session ();
     Session& operator = (const Session&) = delete;
     Session& operator = (Session&& other) = delete;
 
-    std::string getAccessToken() const;
-    std::string getRenewToken() const;
-    void accept(std::unique_ptr<Request> request) override;
+    std::string getAccessToken () const;
+    std::string getRenewToken () const;
+    void accept (std::unique_ptr<Request> request) override;
 
     const unsigned int id;
     const unsigned int owner;
 
+    void assetAdded (const DB::Asset& asset);
+
 private:
-    void onTimeout();
+    void onTimeout ();
+    void sendUpdates (std::unique_ptr<Request> request);
+    void checkUpdates ();
 
 private:
     std::weak_ptr<TM::Scheduler> scheduler;
@@ -41,4 +51,7 @@ private:
     std::unique_ptr<Request> polling;
     TM::Record::ID timeoutId;
     TM::Scheduler::Delay timeout;
+    std::mutex mtx;
+
+    std::map<std::string, std::map<std::string, nlohmann::json>> cache;
 };