long polling implementation complete

change `res handle(req)' into `void handle(req, res)'
connnection::handle is divide into two part:
    before and after user handler

1 files changed, 80 insertions, 0 deletions

diff --git a/example_chat.cpp b/example_chat.cpp
new file mode 100644
index 0000000..994269e
--- /dev/null
+++ b/example_chat.cpp
@@ -0,0 +1,80 @@
+#include "crow.h"
+#include "json.h"
+#include "mustache.h"
+#include <string>
+#include <vector>
+
+using namespace std;
+
+vector<string> msgs;
+vector<crow::response*> ress;
+
+void broadcast(const string& msg)
+{
+    msgs.push_back(msg);
+    crow::json::wvalue x;
+    x["msgs"][0] = msgs.back();
+    x["last"] = msgs.size();
+    string body = crow::json::dump(x);
+    for(auto* res:ress)
+    {
+        CROW_LOG_DEBUG << res->p << " replied: " << body;
+        res->end(body);
+    }
+    ress.clear();
+}
+
+int main()
+{
+    crow::App app;
+    crow::mustache::set_base(".");
+
+    CROW_ROUTE(app, "/")
+    ([]{
+        crow::mustache::context ctx;
+        return crow::mustache::load("example_chat.html").render();
+    });
+
+    CROW_ROUTE(app, "/logs")
+    ([]{
+        CROW_LOG_INFO << "logs requested";
+        crow::json::wvalue x;
+        for(int i = max(0, (int)msgs.size()-100); i < (int)msgs.size(); i++)
+            x["msgs"][i] = msgs[i];
+        x["last"] = msgs.size();
+        CROW_LOG_INFO << "logs completed";
+        return x;
+    });
+
+    CROW_ROUTE(app, "/logs/<int>")
+    ([](const crow::request& req, crow::response& res, int after){
+        CROW_LOG_INFO << "logs with last " << after;
+        if (after < (int)msgs.size())
+        {
+            crow::json::wvalue x;
+            for(int i = after; i < (int)msgs.size(); i ++)
+                x["msgs"][i-after] = msgs[i];
+            x["last"] = msgs.size();
+
+            res.write(crow::json::dump(x));
+            res.end();
+        }
+        else
+        {
+            ress.push_back(&res);
+            CROW_LOG_DEBUG << res.p << " stored";
+        }
+    });
+
+    CROW_ROUTE(app, "/send")
+    ([](const crow::request& req)
+    {
+        CROW_LOG_INFO << "msg from client: " << req.body;
+        broadcast(req.body);
+        return "";
+    });
+
+    app.port(18080)
+        //.multithreaded()
+        .run();
+}