Merge pull request #262 from dmikushin/repeat-http-request-on-fail

Repeat the http request on fail
reo7sp · May 10, 2023 · fb7535a · fb7535a
2 parents efe43f5 + 6da263a
commit fb7535a
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Showing 2 changed files with 50 additions and 13 deletions.
diff --git a/include/tgbot/net/HttpClient.h b/include/tgbot/net/HttpClient.h
@@ -29,6 +29,24 @@ class TGBOT_API HttpClient {
     virtual std::string makeRequest(const Url& url, const std::vector<HttpReqArg>& args) const = 0;
 
     std::int32_t _timeout = 25;
+
+    /**
+      * @brief Get the maximum number of makeRequest() retries before giving up and throwing an exception.
+      */
+    virtual int getRequestMaxRetries() const {
+        return requestMaxRetries;
+    }
+
+    /**
+      * @brief Get the makeRequest() backoff duration between retries, in seconds.
+      */
+    virtual int getRequestBackoff() const {
+        return requestBackoff;
+    }
+
+private:
+    int requestMaxRetries = 3;
+    int requestBackoff = 1;
 };
 
 }

diff --git a/src/Api.cpp b/src/Api.cpp
@@ -1,5 +1,8 @@
 #include "tgbot/Api.h"
 
+#include <chrono>
+#include <thread>
+
 namespace TgBot {
 
 Api::Api(std::string token, const HttpClient& httpClient, const std::string& url)
@@ -2504,20 +2507,36 @@ boost::property_tree::ptree Api::sendRequest(const std::string& method, const st
     url += "/";
     url += method;
 
-    std::string serverResponse = _httpClient.makeRequest(url, args);
-    if (!serverResponse.compare(0, 6, "<html>")) {
-        throw TgException("tgbot-cpp library have got html page instead of json response. Maybe you entered wrong bot token.");
-    }
-
-    boost::property_tree::ptree result = _tgTypeParser.parseJson(serverResponse);
-    try {
-        if (result.get<bool>("ok", false)) {
-            return result.get_child("result");
-        } else {
-            throw TgException(result.get("description", ""));
+    int requestRetryBackoff = _httpClient.getRequestBackoff();
+    int retries = 0;
+    while (1)
+    {
+        try {
+            std::string serverResponse = _httpClient.makeRequest(url, args);
+            if (!serverResponse.compare(0, 6, "<html>")) {
+                throw TgException("tgbot-cpp library have got html page instead of json response. Maybe you entered wrong bot token.");
+            }
+
+            boost::property_tree::ptree result = _tgTypeParser.parseJson(serverResponse);
+            try {
+                if (result.get<bool>("ok", false)) {
+                    return result.get_child("result");
+                } else {
+                    throw TgException(result.get("description", ""));
+                }
+            } catch (boost::property_tree::ptree_error& e) {
+                throw TgException("tgbot-cpp library can't parse json response. " + std::string(e.what()));
+            }
+        } catch (...) {
+            int max_retries = _httpClient.getRequestMaxRetries();
+            if ((max_retries >= 0) && (retries == max_retries)) {
+                throw;
+            } else {
+                std::this_thread::sleep_for(std::chrono::seconds(requestRetryBackoff));
+                retries++;
+                continue;
+            }
         }
-    } catch (boost::property_tree::ptree_error& e) {
-        throw TgException("tgbot-cpp library can't parse json response. " + std::string(e.what()));
     }
 }
 }