Enhance: Use unordered_map for CURL error mapping (#1142)

* Removed obsolete error code

* Added all non-version related error codes to map

* Added all version related error codes to map

* Refactored getErrorCodeForCurlError to use new unordered_map

* Added PARTIAL_FILE error to unordered_map

* Cleanup of includes and blank lines

* Reformat of code using clang-format

* Suppressed Clang-Tidy warning with NOLINT

* Readd includes for clang-tidy

cpr/error.cpp

@@ -1,202 +1,167 @@
 #include "cpr/error.h"
+#include <curl/curlver.h>
+#include <unordered_map>
 #include <cstdint>
 #include <curl/curl.h>
-#include <curl/curlver.h>
 
 namespace cpr {
-ErrorCode Error::getErrorCodeForCurlError(std::int32_t curl_code) {
-    switch (curl_code) {
-        case CURLE_OK:
-            return ErrorCode::OK;
-        case CURLE_UNSUPPORTED_PROTOCOL:
-            return ErrorCode::UNSUPPORTED_PROTOCOL;
-        case CURLE_FAILED_INIT:
-            return ErrorCode::FAILED_INIT;
-        case CURLE_URL_MALFORMAT:
-            return ErrorCode::URL_MALFORMAT;
-        case CURLE_NOT_BUILT_IN:
-            return ErrorCode::NOT_BUILT_IN;
-        case CURLE_COULDNT_RESOLVE_PROXY:
-            return ErrorCode::COULDNT_RESOLVE_PROXY;
-        case CURLE_COULDNT_RESOLVE_HOST:
-            return ErrorCode::COULDNT_RESOLVE_HOST;
-        case CURLE_COULDNT_CONNECT:
-            return ErrorCode::COULDNT_CONNECT;
+static const std::unordered_map<std::int32_t, ErrorCode> curl_error_map = { // NOLINT - (needed because of static init)
+        {CURLE_OK, ErrorCode::OK},
+        {CURLE_UNSUPPORTED_PROTOCOL, ErrorCode::UNSUPPORTED_PROTOCOL},
+        {CURLE_FAILED_INIT, ErrorCode::FAILED_INIT},
+        {CURLE_URL_MALFORMAT, ErrorCode::URL_MALFORMAT},
+        {CURLE_NOT_BUILT_IN, ErrorCode::NOT_BUILT_IN},
+        {CURLE_COULDNT_RESOLVE_PROXY, ErrorCode::COULDNT_RESOLVE_PROXY},
+        {CURLE_COULDNT_RESOLVE_HOST, ErrorCode::COULDNT_RESOLVE_HOST},
+        {CURLE_COULDNT_CONNECT, ErrorCode::COULDNT_CONNECT},
+
 // Name changed in curl >= 7.51.0.
 #if LIBCURL_VERSION_NUM >= 0x073300
-        case CURLE_WEIRD_SERVER_REPLY:
+        {CURLE_WEIRD_SERVER_REPLY, ErrorCode::WEIRD_SERVER_REPLY},
 #else
-        case CURLE_FTP_WEIRD_SERVER_REPLY:
-#endif
-            return ErrorCode::WEIRD_SERVER_REPLY;
-        case CURLE_REMOTE_ACCESS_DENIED:
-            return ErrorCode::REMOTE_ACCESS_DENIED;
-        case CURLE_HTTP2:
-            return ErrorCode::HTTP2;
-        case CURLE_QUOTE_ERROR:
-            return ErrorCode::QUOTE_ERROR;
-        case CURLE_HTTP_RETURNED_ERROR:
-            return ErrorCode::HTTP_RETURNED_ERROR;
-        case CURLE_WRITE_ERROR:
-            return ErrorCode::WRITE_ERROR;
-        case CURLE_UPLOAD_FAILED:
-            return ErrorCode::UPLOAD_FAILED;
-        case CURLE_READ_ERROR:
-            return ErrorCode::READ_ERROR;
-        case CURLE_OUT_OF_MEMORY:
-            return ErrorCode::OUT_OF_MEMORY;
-        case CURLE_OPERATION_TIMEDOUT:
-            return ErrorCode::OPERATION_TIMEDOUT;
-        case CURLE_RANGE_ERROR:
-            return ErrorCode::RANGE_ERROR;
-        case CURLE_HTTP_POST_ERROR:
-            return ErrorCode::HTTP_POST_ERROR;
-        case CURLE_SSL_CONNECT_ERROR:
-            return ErrorCode::SSL_CONNECT_ERROR;
-        case CURLE_BAD_DOWNLOAD_RESUME:
-            return ErrorCode::BAD_DOWNLOAD_RESUME;
-        case CURLE_FILE_COULDNT_READ_FILE:
-            return ErrorCode::FILE_COULDNT_READ_FILE;
-        case CURLE_FUNCTION_NOT_FOUND:
-            return ErrorCode::FUNCTION_NOT_FOUND;
-        case CURLE_ABORTED_BY_CALLBACK:
-            return ErrorCode::ABORTED_BY_CALLBACK;
-        case CURLE_BAD_FUNCTION_ARGUMENT:
-            return ErrorCode::BAD_FUNCTION_ARGUMENT;
-        case CURLE_INTERFACE_FAILED:
-            return ErrorCode::INTERFACE_FAILED;
-        case CURLE_OBSOLETE46:
-            return ErrorCode::OBSOLETE46;
-        case CURLE_TOO_MANY_REDIRECTS:
-            return ErrorCode::TOO_MANY_REDIRECTS;
-        case CURLE_UNKNOWN_OPTION:
-            return ErrorCode::UNKNOWN_OPTION;
+        {CURLE_FTP_WEIRD_SERVER_REPLY, ErrorCode::WEIRD_SERVER_REPLY},
+#endif
+
+        {CURLE_REMOTE_ACCESS_DENIED, ErrorCode::REMOTE_ACCESS_DENIED},
+        {CURLE_HTTP2, ErrorCode::HTTP2},
+        {CURLE_QUOTE_ERROR, ErrorCode::QUOTE_ERROR},
+        {CURLE_HTTP_RETURNED_ERROR, ErrorCode::HTTP_RETURNED_ERROR},
+        {CURLE_WRITE_ERROR, ErrorCode::WRITE_ERROR},
+        {CURLE_UPLOAD_FAILED, ErrorCode::UPLOAD_FAILED},
+        {CURLE_READ_ERROR, ErrorCode::READ_ERROR},
+        {CURLE_OUT_OF_MEMORY, ErrorCode::OUT_OF_MEMORY},
+        {CURLE_OPERATION_TIMEDOUT, ErrorCode::OPERATION_TIMEDOUT},
+        {CURLE_RANGE_ERROR, ErrorCode::RANGE_ERROR},
+        {CURLE_HTTP_POST_ERROR, ErrorCode::HTTP_POST_ERROR},
+        {CURLE_SSL_CONNECT_ERROR, ErrorCode::SSL_CONNECT_ERROR},
+        {CURLE_BAD_DOWNLOAD_RESUME, ErrorCode::BAD_DOWNLOAD_RESUME},
+        {CURLE_FILE_COULDNT_READ_FILE, ErrorCode::FILE_COULDNT_READ_FILE},
+        {CURLE_FUNCTION_NOT_FOUND, ErrorCode::FUNCTION_NOT_FOUND},
+        {CURLE_ABORTED_BY_CALLBACK, ErrorCode::ABORTED_BY_CALLBACK},
+        {CURLE_BAD_FUNCTION_ARGUMENT, ErrorCode::BAD_FUNCTION_ARGUMENT},
+        {CURLE_INTERFACE_FAILED, ErrorCode::INTERFACE_FAILED},
+        {CURLE_TOO_MANY_REDIRECTS, ErrorCode::TOO_MANY_REDIRECTS},
+        {CURLE_UNKNOWN_OPTION, ErrorCode::UNKNOWN_OPTION},
+
 // Added in curl 7.78.0.
 #if LIBCURL_VERSION_NUM >= 0x074E00
-        case CURLE_SETOPT_OPTION_SYNTAX:
-            return ErrorCode::SETOPT_OPTION_SYNTAX;
-#endif
-        case CURLE_GOT_NOTHING:
-            return ErrorCode::GOT_NOTHING;
-        case CURLE_SSL_ENGINE_NOTFOUND:
-            return ErrorCode::SSL_ENGINE_NOTFOUND;
-        case CURLE_SSL_ENGINE_SETFAILED:
-            return ErrorCode::SSL_ENGINE_SETFAILED;
-        case CURLE_SEND_ERROR:
-            return ErrorCode::SEND_ERROR;
-        case CURLE_RECV_ERROR:
-            return ErrorCode::RECV_ERROR;
-        case CURLE_SSL_CERTPROBLEM:
-            return ErrorCode::SSL_CERTPROBLEM;
-        case CURLE_SSL_CIPHER:
-            return ErrorCode::SSL_CIPHER;
-        case CURLE_PEER_FAILED_VERIFICATION:
-            return ErrorCode::PEER_FAILED_VERIFICATION;
-        case CURLE_BAD_CONTENT_ENCODING:
-            return ErrorCode::BAD_CONTENT_ENCODING;
-        case CURLE_FILESIZE_EXCEEDED:
-            return ErrorCode::FILESIZE_EXCEEDED;
-        case CURLE_USE_SSL_FAILED:
-            return ErrorCode::USE_SSL_FAILED;
-        case CURLE_SEND_FAIL_REWIND:
-            return ErrorCode::SEND_FAIL_REWIND;
-        case CURLE_SSL_ENGINE_INITFAILED:
-            return ErrorCode::SSL_ENGINE_INITFAILED;
+        {CURLE_SETOPT_OPTION_SYNTAX, ErrorCode::SETOPT_OPTION_SYNTAX},
+#endif
+
+        {CURLE_GOT_NOTHING, ErrorCode::GOT_NOTHING},
+        {CURLE_SSL_ENGINE_NOTFOUND, ErrorCode::SSL_ENGINE_NOTFOUND},
+        {CURLE_SSL_ENGINE_SETFAILED, ErrorCode::SSL_ENGINE_SETFAILED},
+        {CURLE_SEND_ERROR, ErrorCode::SEND_ERROR},
+        {CURLE_RECV_ERROR, ErrorCode::RECV_ERROR},
+        {CURLE_SSL_CERTPROBLEM, ErrorCode::SSL_CERTPROBLEM},
+        {CURLE_SSL_CIPHER, ErrorCode::SSL_CIPHER},
+        {CURLE_PEER_FAILED_VERIFICATION, ErrorCode::PEER_FAILED_VERIFICATION},
+        {CURLE_BAD_CONTENT_ENCODING, ErrorCode::BAD_CONTENT_ENCODING},
+        {CURLE_FILESIZE_EXCEEDED, ErrorCode::FILESIZE_EXCEEDED},
+        {CURLE_USE_SSL_FAILED, ErrorCode::USE_SSL_FAILED},
+        {CURLE_SEND_FAIL_REWIND, ErrorCode::SEND_FAIL_REWIND},
+        {CURLE_SSL_ENGINE_INITFAILED, ErrorCode::SSL_ENGINE_INITFAILED},
+
 // Added in curl 7.13.1.
 #if LIBCURL_VERSION_NUM >= 0x070D01
-        case CURLE_LOGIN_DENIED:
-            return ErrorCode::LOGIN_DENIED;
+        {CURLE_LOGIN_DENIED, ErrorCode::LOGIN_DENIED},
 #endif
+
 // Added in curl 7.16.0.
 #if LIBCURL_VERSION_NUM >= 0x071000
-        case CURLE_SSL_CACERT_BADFILE:
-            return ErrorCode::SSL_CACERT_BADFILE;
+        {CURLE_SSL_CACERT_BADFILE, ErrorCode::SSL_CACERT_BADFILE},
 #endif
+
 // Added in curl 7.16.1.
 #if LIBCURL_VERSION_NUM >= 0x071001
-        case CURLE_SSL_SHUTDOWN_FAILED:
-            return ErrorCode::SSL_SHUTDOWN_FAILED;
+        {CURLE_SSL_SHUTDOWN_FAILED, ErrorCode::SSL_SHUTDOWN_FAILED},
 #endif
+
 // Added in curl 7.18.2.
 #if LIBCURL_VERSION_NUM >= 0x071202
-        case CURLE_AGAIN:
-            return ErrorCode::AGAIN;
+        {CURLE_AGAIN, ErrorCode::AGAIN},
 #endif
+
 // Added in curl 7.19.0.
 #if LIBCURL_VERSION_NUM >= 0x071300
-        case CURLE_SSL_CRL_BADFILE:
-            return ErrorCode::SSL_CRL_BADFILE;
-        case CURLE_SSL_ISSUER_ERROR:
-            return ErrorCode::SSL_ISSUER_ERROR;
+        {CURLE_SSL_CRL_BADFILE, ErrorCode::SSL_CRL_BADFILE},
+        {CURLE_SSL_ISSUER_ERROR, ErrorCode::SSL_ISSUER_ERROR},
 #endif
+
 // Added in curl 7.21.0.
 #if LIBCURL_VERSION_NUM >= 0x071500
-        case CURLE_CHUNK_FAILED:
-            return ErrorCode::CHUNK_FAILED;
+        {CURLE_CHUNK_FAILED, ErrorCode::CHUNK_FAILED},
 #endif
+
 // Added in curl 7.30.0.
 #if LIBCURL_VERSION_NUM >= 0x071E00
-        case CURLE_NO_CONNECTION_AVAILABLE:
-            return ErrorCode::NO_CONNECTION_AVAILABLE;
+        {CURLE_NO_CONNECTION_AVAILABLE, ErrorCode::NO_CONNECTION_AVAILABLE},
 #endif
+
 // Added in curl 7.39.0.
 #if LIBCURL_VERSION_NUM >= 0x072700
-        case CURLE_SSL_PINNEDPUBKEYNOTMATCH:
-            return ErrorCode::SSL_PINNEDPUBKEYNOTMATCH;
+        {CURLE_SSL_PINNEDPUBKEYNOTMATCH, ErrorCode::SSL_PINNEDPUBKEYNOTMATCH},
 #endif
+
 // Added in curl 7.41.0.
 #if LIBCURL_VERSION_NUM >= 0x072900
-        case CURLE_SSL_INVALIDCERTSTATUS:
-            return ErrorCode::SSL_INVALIDCERTSTATUS;
+        {CURLE_SSL_INVALIDCERTSTATUS, ErrorCode::SSL_INVALIDCERTSTATUS},
 #endif
+
 // Added in curl 7.49.0.
 #if LIBCURL_VERSION_NUM >= 0x073100
-        case CURLE_HTTP2_STREAM:
-            return ErrorCode::HTTP2_STREAM;
+        {CURLE_HTTP2_STREAM, ErrorCode::HTTP2_STREAM},
 #endif
+
+        {CURLE_PARTIAL_FILE, ErrorCode::PARTIAL_FILE},
+
 // Added in curl 7.59.0.
 #if LIBCURL_VERSION_NUM >= 0x073B00
-        case CURLE_RECURSIVE_API_CALL:
-            return ErrorCode::RECURSIVE_API_CALL;
+        {CURLE_RECURSIVE_API_CALL, ErrorCode::RECURSIVE_API_CALL},
 #endif
+
 // Added in curl 7.66.0.
 #if LIBCURL_VERSION_NUM >= 0x074200
-        case CURLE_AUTH_ERROR:
-            return ErrorCode::AUTH_ERROR;
+        {CURLE_AUTH_ERROR, ErrorCode::AUTH_ERROR},
 #endif
+
 // Added in curl 7.68.0.
 #if LIBCURL_VERSION_NUM >= 0x074400
-        case CURLE_HTTP3:
-            return ErrorCode::HTTP3;
+        {CURLE_HTTP3, ErrorCode::HTTP3},
 #endif
+
 // Added in curl 7.69.0.
 #if LIBCURL_VERSION_NUM >= 0x074500
-        case CURLE_QUIC_CONNECT_ERROR:
-            return ErrorCode::QUIC_CONNECT_ERROR;
+        {CURLE_QUIC_CONNECT_ERROR, ErrorCode::QUIC_CONNECT_ERROR},
 #endif
+
 // Added in curl 7.73.0.
 #if LIBCURL_VERSION_NUM >= 0x074900
-        case CURLE_PROXY:
-            return ErrorCode::PROXY;
+        {CURLE_PROXY, ErrorCode::PROXY},
 #endif
+
 // Added in curl 7.77.0.
 #if LIBCURL_VERSION_NUM >= 0x074D00
-        case CURLE_SSL_CLIENTCERT:
-            return ErrorCode::SSL_CLIENTCERT;
+        {CURLE_SSL_CLIENTCERT, ErrorCode::SSL_CLIENTCERT},
 #endif
+
 // Added in curl 7.84.0.
 #if LIBCURL_VERSION_NUM >= 0x075400
-        case CURLE_UNRECOVERABLE_POLL:
-            return ErrorCode::UNRECOVERABLE_POLL;
+        {CURLE_UNRECOVERABLE_POLL, ErrorCode::UNRECOVERABLE_POLL},
 #endif
+
 // Added in curl 7.6.0.
 #if LIBCURL_VERSION_NUM >= 0x080600
-        case CURLE_TOO_LARGE:
-            return ErrorCode::TOO_LARGE;
+        {CURLE_TOO_LARGE, ErrorCode::TOO_LARGE},
 #endif
-        default:
-            return ErrorCode::UNKNOWN_ERROR;
+};
+
+ErrorCode Error::getErrorCodeForCurlError(std::int32_t curl_code) {
+    auto it = curl_error_map.find(curl_code);
+    if (it == curl_error_map.end()) {
+        // Default return value when the CURL error code is not recognized
+        return ErrorCode::UNKNOWN_ERROR;
     }
+    return it->second;
 }
-
-} // namespace cpr
+} // namespace cpr

include/cpr/error.h

@@ -45,7 +45,6 @@ enum class ErrorCode {
     ABORTED_BY_CALLBACK,
     BAD_FUNCTION_ARGUMENT,
     INTERFACE_FAILED,
-    OBSOLETE46,
     TOO_MANY_REDIRECTS,
     UNKNOWN_OPTION,
     SETOPT_OPTION_SYNTAX,