add curl handler pre-invoke-callback to c-libcurl (#21654)

Author: hirishh

modules/openapi-generator/src/main/resources/C-libcurl/apiClient.c.mustache

@@ -11,6 +11,7 @@ apiClient_t *apiClient_create() {
     apiClient->basePath = strdup("{{{basePath}}}");
     apiClient->sslConfig = NULL;
     apiClient->curlConfig = NULL;
+    apiClient->curl_pre_invoke_func = NULL;
     apiClient->dataReceived = NULL;
     apiClient->dataReceivedLen = 0;
     apiClient->data_callback_func = NULL;
@@ -67,6 +68,7 @@ apiClient_t *apiClient_create_with_base_path(const char *basePath
     apiClient->curlConfig->keepidle = 120;
     apiClient->curlConfig->keepintvl = 60;
 
+    apiClient->curl_pre_invoke_func = NULL;
     apiClient->dataReceived = NULL;
     apiClient->dataReceivedLen = 0;
     apiClient->data_callback_func = NULL;
@@ -155,6 +157,8 @@ void apiClient_free(apiClient_t *apiClient) {
         apiClient->curlConfig = NULL;
     }
 
+    apiClient->curl_pre_invoke_func = NULL;
+
     free(apiClient);
 }
 
@@ -564,6 +568,10 @@ void apiClient_invoke(apiClient_t    *apiClient,
             curl_easy_setopt(handle, CURLOPT_VERBOSE, apiClient->curlConfig->verbose);
         }
 
+        if(apiClient->curl_pre_invoke_func) {
+            apiClient->curl_pre_invoke_func(handle);
+        }
+
         res = curl_easy_perform(handle);
 
         curl_slist_free_all(headers);

modules/openapi-generator/src/main/resources/C-libcurl/apiClient.h.mustache

@@ -32,6 +32,7 @@ typedef struct apiClient_t {
     char *basePath;
     sslConfig_t *sslConfig;
     curlConfig_t *curlConfig;
+    void (*curl_pre_invoke_func)(CURL *);
     void *dataReceived;
     long dataReceivedLen;
     void (*data_callback_func)(void **, long *);

samples/client/others/c/bearerAuth/include/apiClient.h

@@ -32,6 +32,7 @@ typedef struct apiClient_t {
     char *basePath;
     sslConfig_t *sslConfig;
     curlConfig_t *curlConfig;
+    void (*curl_pre_invoke_func)(CURL *);
     void *dataReceived;
     long dataReceivedLen;
     void (*data_callback_func)(void **, long *);

samples/client/others/c/bearerAuth/src/apiClient.c

@@ -11,6 +11,7 @@ apiClient_t *apiClient_create() {
     apiClient->basePath = strdup("http://api.example.com/v1");
     apiClient->sslConfig = NULL;
     apiClient->curlConfig = NULL;
+    apiClient->curl_pre_invoke_func = NULL;
     apiClient->dataReceived = NULL;
     apiClient->dataReceivedLen = 0;
     apiClient->data_callback_func = NULL;
@@ -44,6 +45,7 @@ apiClient_t *apiClient_create_with_base_path(const char *basePath
     apiClient->curlConfig->keepidle = 120;
     apiClient->curlConfig->keepintvl = 60;
 
+    apiClient->curl_pre_invoke_func = NULL;
     apiClient->dataReceived = NULL;
     apiClient->dataReceivedLen = 0;
     apiClient->data_callback_func = NULL;
@@ -71,6 +73,8 @@ void apiClient_free(apiClient_t *apiClient) {
         apiClient->curlConfig = NULL;
     }
 
+    apiClient->curl_pre_invoke_func = NULL;
+
     free(apiClient);
 }
 
@@ -419,6 +423,10 @@ void apiClient_invoke(apiClient_t    *apiClient,
             curl_easy_setopt(handle, CURLOPT_VERBOSE, apiClient->curlConfig->verbose);
         }
 
+        if(apiClient->curl_pre_invoke_func) {
+            apiClient->curl_pre_invoke_func(handle);
+        }
+
         res = curl_easy_perform(handle);
 
         curl_slist_free_all(headers);

samples/client/petstore/c-useJsonUnformatted/include/apiClient.h

@@ -32,6 +32,7 @@ typedef struct apiClient_t {
     char *basePath;
     sslConfig_t *sslConfig;
     curlConfig_t *curlConfig;
+    void (*curl_pre_invoke_func)(CURL *);
     void *dataReceived;
     long dataReceivedLen;
     void (*data_callback_func)(void **, long *);

samples/client/petstore/c-useJsonUnformatted/src/apiClient.c

@@ -11,6 +11,7 @@ apiClient_t *apiClient_create() {
     apiClient->basePath = strdup("http://petstore.swagger.io/v2");
     apiClient->sslConfig = NULL;
     apiClient->curlConfig = NULL;
+    apiClient->curl_pre_invoke_func = NULL;
     apiClient->dataReceived = NULL;
     apiClient->dataReceivedLen = 0;
     apiClient->data_callback_func = NULL;
@@ -46,6 +47,7 @@ apiClient_t *apiClient_create_with_base_path(const char *basePath
     apiClient->curlConfig->keepidle = 120;
     apiClient->curlConfig->keepintvl = 60;
 
+    apiClient->curl_pre_invoke_func = NULL;
     apiClient->dataReceived = NULL;
     apiClient->dataReceivedLen = 0;
     apiClient->data_callback_func = NULL;
@@ -98,6 +100,8 @@ void apiClient_free(apiClient_t *apiClient) {
         apiClient->curlConfig = NULL;
     }
 
+    apiClient->curl_pre_invoke_func = NULL;
+
     free(apiClient);
 }
 
@@ -456,6 +460,10 @@ void apiClient_invoke(apiClient_t    *apiClient,
             curl_easy_setopt(handle, CURLOPT_VERBOSE, apiClient->curlConfig->verbose);
         }
 
+        if(apiClient->curl_pre_invoke_func) {
+            apiClient->curl_pre_invoke_func(handle);
+        }
+
         res = curl_easy_perform(handle);
 
         curl_slist_free_all(headers);

samples/client/petstore/c/include/apiClient.h

@@ -32,6 +32,7 @@ typedef struct apiClient_t {
     char *basePath;
     sslConfig_t *sslConfig;
     curlConfig_t *curlConfig;
+    void (*curl_pre_invoke_func)(CURL *);
     void *dataReceived;
     long dataReceivedLen;
     void (*data_callback_func)(void **, long *);

samples/client/petstore/c/src/apiClient.c

@@ -11,6 +11,7 @@ apiClient_t *apiClient_create() {
     apiClient->basePath = strdup("http://petstore.swagger.io/v2");
     apiClient->sslConfig = NULL;
     apiClient->curlConfig = NULL;
+    apiClient->curl_pre_invoke_func = NULL;
     apiClient->dataReceived = NULL;
     apiClient->dataReceivedLen = 0;
     apiClient->data_callback_func = NULL;
@@ -46,6 +47,7 @@ apiClient_t *apiClient_create_with_base_path(const char *basePath
     apiClient->curlConfig->keepidle = 120;
     apiClient->curlConfig->keepintvl = 60;
 
+    apiClient->curl_pre_invoke_func = NULL;
     apiClient->dataReceived = NULL;
     apiClient->dataReceivedLen = 0;
     apiClient->data_callback_func = NULL;
@@ -98,6 +100,8 @@ void apiClient_free(apiClient_t *apiClient) {
         apiClient->curlConfig = NULL;
     }
 
+    apiClient->curl_pre_invoke_func = NULL;
+
     free(apiClient);
 }
 
@@ -456,6 +460,10 @@ void apiClient_invoke(apiClient_t    *apiClient,
             curl_easy_setopt(handle, CURLOPT_VERBOSE, apiClient->curlConfig->verbose);
         }
 
+        if(apiClient->curl_pre_invoke_func) {
+            apiClient->curl_pre_invoke_func(handle);
+        }
+
         res = curl_easy_perform(handle);
 
         curl_slist_free_all(headers);

samples/client/petstore/c/unit-tests/manual-PetAPI.c

@@ -2,8 +2,10 @@
     #include <stdlib.h>
     #include <string.h>
     #include <assert.h>
+    #include <curl/curl.h>
     #include "../api/PetAPI.h"
 
+    void preInvokeFunc(CURL *curl);
 
     #define EXAMPLE_CATEGORY_NAME "Example Category"
     #define EXAMPLE_CATEGORY_ID 5
@@ -16,10 +18,15 @@
     #define EXAMPLE_TAG_2_ID 542353
     #define EXAMPLE_PET_ID 1234 // Set to 0 to generate a new pet
 
+void preInvokeFunc(CURL *curl) {
+    curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
+    printf("CURL pre-invoke function called - verbose mode enabled\n");
+}
 
 int main() {
 // Add pet test
 	apiClient_t *apiClient = apiClient_create();
+	apiClient->curl_pre_invoke_func = preInvokeFunc;
 
 	char *categoryName = malloc(strlen(EXAMPLE_CATEGORY_NAME) + 1);
 	strcpy(categoryName, EXAMPLE_CATEGORY_NAME);