Create libcurl wrappers

Created wrappers which are currently focused on master server queries. This avoids boiler plating and manual deleting.

r5dev/tier2/curlutils.cpp

@@ -0,0 +1,83 @@
+//===========================================================================//
+//
+// Purpose: A set of utilities to perform requests
+//
+//===========================================================================//
+#include "core/stdafx.h"
+#include "curlutils.h"
+
+size_t CURLWriteStringCallback(char* contents, size_t size, size_t nmemb, void* userp)
+{
+    reinterpret_cast<string*>(userp)->append(contents, size * nmemb);
+    return size * nmemb;
+}
+
+CURL* CURLInitRequest(const string& hostname, const string& request, string& response, curl_slist* slist)
+{
+    std::function<void(const char*)> fnError = [&](const char* errorMsg)
+    {
+        Error(eDLL_T::ENGINE, NO_ERROR, "CURL: %s\n", errorMsg);
+        curl_slist_free_all(slist);
+        return nullptr;
+    };
+
+    slist = curl_slist_append(slist, "Content-Type: application/json");
+    if (!slist)
+    {
+        fnError("Slist init failed");
+    }
+
+    CURL* curl = curl_easy_init();
+    if (!curl)
+    {
+        fnError("Easy init failed");
+    }
+
+    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
+    curl_easy_setopt(curl, CURLOPT_URL, hostname.c_str());
+    curl_easy_setopt(curl, CURLOPT_POSTFIELDS, request.c_str());
+    curl_easy_setopt(curl, CURLOPT_POST, 1L);
+    curl_easy_setopt(curl, CURLOPT_TIMEOUT, 10L);
+    curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_ALL);
+
+    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, CURLWriteStringCallback);
+    curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response);
+
+    return curl;
+}
+
+CURLcode CURLSubmitRequest(CURL* curl, curl_slist* slist)
+{
+    CURLcode res = curl_easy_perform(curl);
+    curl_slist_free_all(slist);
+
+    return res;
+}
+
+CURLINFO CURLRetrieveInfo(CURL* curl)
+{
+    CURLINFO status;
+    curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &status);
+    curl_easy_cleanup(curl);
+
+    return status;
+}
+
+bool CURLHandleError(CURL* curl, CURLcode res, string& outMessage)
+{
+    if (res == CURLE_OK)
+        return true;
+
+    const char* curlError = curl_easy_strerror(res);
+    Error(eDLL_T::ENGINE, NO_ERROR, "CURL: %s\n", curlError);
+
+    outMessage = curlError;
+    curl_easy_cleanup(curl);
+
+    return false;
+}
+
+void CURLFormatUrl(string& url, const string& host, const string& api)
+{
+    url = fmt::format("{:s}{:s}{:s}", "https://", host, api);
+}

r5dev/tier2/curlutils.h

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+#ifndef TIER2_CURLUTILS_H
+#define TIER2_CURLUTILS_H
+
+size_t CURLWriteStringCallback(char* contents, size_t size, size_t nmemb, void* userp);
+
+CURL* CURLInitRequest(const string& hostname, const string& request, string& response, curl_slist* slist);
+CURLcode CURLSubmitRequest(CURL* curl, curl_slist* slist);
+CURLINFO CURLRetrieveInfo(CURL* curl);
+
+bool CURLHandleError(CURL* curl, CURLcode res, string& outMessage);
+void CURLFormatUrl(string& url, const string& host, const string& api);
+
+#endif // !TIER2_CURLUTILS_H