From 183a664405661fb531b82e2a0a3a8c6651a1ce8a Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Wed, 10 Oct 2018 21:23:41 -0400
Subject: web_backend: Make Client use the PImpl idiom

Like with TelemetryJson, we can make the implementation details private
and avoid the need to expose httplib to external libraries that need to
use the Client class.
---
 src/web_service/web_backend.h | 58 ++++++++-----------------------------------
 1 file changed, 10 insertions(+), 48 deletions(-)

(limited to 'src/web_service/web_backend.h')

diff --git a/src/web_service/web_backend.h b/src/web_service/web_backend.h
index d75fbcc15..c637e09df 100644
--- a/src/web_service/web_backend.h
+++ b/src/web_service/web_backend.h
@@ -4,23 +4,19 @@
 
 #pragma once
 
-#include <functional>
-#include <mutex>
+#include <memory>
 #include <string>
-#include <tuple>
-#include <httplib.h>
-#include "common/common_types.h"
-#include "common/web_result.h"
 
-namespace httplib {
-class Client;
+namespace Common {
+struct WebResult;
 }
 
 namespace WebService {
 
 class Client {
 public:
-    Client(const std::string& host, const std::string& username, const std::string& token);
+    Client(std::string host, std::string username, std::string token);
+    ~Client();
 
     /**
      * Posts JSON to the specified path.
@@ -30,9 +26,7 @@ public:
      * @return the result of the request.
      */
     Common::WebResult PostJson(const std::string& path, const std::string& data,
-                               bool allow_anonymous) {
-        return GenericJson("POST", path, data, allow_anonymous);
-    }
+                               bool allow_anonymous);
 
     /**
      * Gets JSON from the specified path.
@@ -40,9 +34,7 @@ public:
      * @param allow_anonymous If true, allow anonymous unauthenticated requests.
      * @return the result of the request.
      */
-    Common::WebResult GetJson(const std::string& path, bool allow_anonymous) {
-        return GenericJson("GET", path, "", allow_anonymous);
-    }
+    Common::WebResult GetJson(const std::string& path, bool allow_anonymous);
 
     /**
      * Deletes JSON to the specified path.
@@ -52,41 +44,11 @@ public:
      * @return the result of the request.
      */
     Common::WebResult DeleteJson(const std::string& path, const std::string& data,
-                                 bool allow_anonymous) {
-        return GenericJson("DELETE", path, data, allow_anonymous);
-    }
+                                 bool allow_anonymous);
 
 private:
-    /// A generic function handles POST, GET and DELETE request together
-    Common::WebResult GenericJson(const std::string& method, const std::string& path,
-                                  const std::string& data, bool allow_anonymous);
-
-    /**
-     * A generic function with explicit authentication method specified
-     * JWT is used if the jwt parameter is not empty
-     * username + token is used if jwt is empty but username and token are not empty
-     * anonymous if all of jwt, username and token are empty
-     */
-    Common::WebResult GenericJson(const std::string& method, const std::string& path,
-                                  const std::string& data, const std::string& jwt = "",
-                                  const std::string& username = "", const std::string& token = "");
-
-    // Retrieve a new JWT from given username and token
-    void UpdateJWT();
-
-    std::string host;
-    std::string username;
-    std::string token;
-    std::string jwt;
-    std::unique_ptr<httplib::Client> cli;
-
-    struct JWTCache {
-        std::mutex mutex;
-        std::string username;
-        std::string token;
-        std::string jwt;
-    };
-    static JWTCache jwt_cache;
+    struct Impl;
+    std::unique_ptr<Impl> impl;
 };
 
 } // namespace WebService
-- 
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