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DanyTDanyT
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add example for load_kube_config_buffer
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‎examples/Makefile

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@@ -2,6 +2,7 @@ all:
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cd create_pod; make
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cd list_pod_with_invalid_kubeconfig; make
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cd list_pod; make
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cd list_pod_buffer; make
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cd list_pod_incluster; make
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cd delete_pod; make
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cd exec_provider; make
@@ -18,6 +19,7 @@ clean:
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cd create_pod; make clean
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cd list_pod_with_invalid_kubeconfig; make clean
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cd list_pod; make clean
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cd list_pod_buffer; make clean
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cd list_pod_incluster; make clean
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cd delete_pod; make clean
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cd exec_provider; make clean
@@ -35,6 +37,7 @@ test:
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kubectl wait --for=condition=ready --all pod -n default --timeout=60s
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cd list_pod_with_invalid_kubeconfig; make test
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cd list_pod; make test
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cd list_pod_buffer; make test
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cd delete_pod; make test
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kubectl wait --for=delete pod/test-pod-6 -n default --timeout=120s
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cd list_secret; make test

‎examples/exec_provider/list_pod_by_exec_provider.c~

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#include <kube_config.h>
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#include <apiClient.h>
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#include <CoreV1API.h>
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#include <malloc.h>
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#include <stdio.h>
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#include <errno.h>
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void list_pod(apiClient_t * apiClient)
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{
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v1_pod_list_t *pod_list = NULL;
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pod_list = CoreV1API_listNamespacedPod(apiClient, "default", /*namespace */
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NULL, /* pretty */
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NULL, /* allowWatchBookmarks */
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NULL, /* continue */
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NULL, /* fieldSelector */
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NULL, /* labelSelector */
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NULL, /* limit */
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NULL, /* resourceVersion */
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NULL, /* resourceVersionMatch */
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NULL, /* sendInitialEvents */
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NULL, /* timeoutSeconds */
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NULL /* watch */
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);
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printf("The return code of HTTP request=%ld\n", apiClient->response_code);
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if (pod_list) {
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printf("Get pod list:\n");
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listEntry_t *listEntry = NULL;
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v1_pod_t *pod = NULL;
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list_ForEach(listEntry, pod_list->items) {
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pod = listEntry->data;
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printf("\tThe pod name: %s\n", pod->metadata->name);
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}
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v1_pod_list_free(pod_list);
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pod_list = NULL;
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} else {
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printf("Cannot get any pod.\n");
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}
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}
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int main(int argc, char *argv[])
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{
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int rc = 0;
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char *baseName = NULL;
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sslConfig_t *sslConfig = NULL;
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list_t *apiKeys = NULL;
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apiClient_t *k8sApiClient = NULL;
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rc = load_kube_config(&baseName, &sslConfig, &apiKeys, "./config_with_exec_provider");
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if (0 == rc) {
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k8sApiClient = apiClient_create_with_base_path(baseName, sslConfig, apiKeys);
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} else {
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printf("Cannot load kubernetes configuration.\n");
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return -1;
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}
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if (k8sApiClient) {
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list_pod(k8sApiClient);
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}
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free_client_config(baseName, sslConfig, apiKeys);
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baseName = NULL;
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sslConfig = NULL;
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apiKeys = NULL;
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apiClient_free(k8sApiClient);
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k8sApiClient = NULL;
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apiClient_unsetupGlobalEnv();
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return rc;
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}

‎examples/exec_provider/my_exec_provider.c~

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#define _GNU_SOURCE
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#define ENV_EXEC_CLIENT_CERTIFICATE_DATA "exec_client_certificate_data"
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#define ENV_EXEC_CLIENT_PRIVATE_KEY "exec_client_private_key"
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char token_template[] = "\
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{\
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\"apiVersion\": \"client.authentication.k8s.io/v1beta1\",\
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\"kind\": \"ExecCredential\",\
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\"status\": {\
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\"token\": \"%s\"\
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}\
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}";
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char certificate_template[] = "\
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{\
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\"apiVersion\": \"client.authentication.k8s.io/v1beta1\",\
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\"kind\": \"ExecCredential\",\
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\"status\": {\
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\"clientCertificateData\": \"%s\",\
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\"clientKeyData\": \"%s\"\
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}\
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}";
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int main(int argc, char *argv[])
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{
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const char *client_certificate_data = secure_getenv(ENV_EXEC_CLIENT_CERTIFICATE_DATA);
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const char *client_private_key = secure_getenv(ENV_EXEC_CLIENT_PRIVATE_KEY);
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if ((4 == argc) && argv[3]) {
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// token is passed by command line argument
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printf(token_template, argv[3]);
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} else if ((client_certificate_data) && strlen(client_certificate_data) > 0 && (client_private_key) && strlen(client_private_key) > 0) {
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// client certificate and private key are passed by environment variables
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printf(certificate_template, client_certificate_data, client_private_key);
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} else {
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printf("Cannot get authentication data\n");
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}
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return 0;
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}

‎examples/list_pod_buffer/.gitignore

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@@ -0,0 +1 @@
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list_pod_buffer_bin

‎examples/list_pod_buffer/CMakeLists.txt

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@@ -0,0 +1,4 @@
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find_package(${pkgName} CONFIG REQUIRED COMPONENTS ${pkgName})
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add_executable(list_pod_buffer main.c)
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target_link_libraries(list_pod_buffer PRIVATE ${pkgName}::${pkgName})

‎examples/list_pod_buffer/Makefile

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INCLUDE:=-I../../kubernetes/ -I/usr/local/include/kubernetes/
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LIBS:=-L../../kubernetes/build -lyaml -lwebsockets -lkubernetes -L/usr/local/lib
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CFLAGS:=-g
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BIN:=list_pod_buffer_bin
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.PHONY : all clean test memcheck
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all:
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gcc main.c $(CFLAGS) $(INCLUDE) $(LIBS) -o $(BIN)
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test:
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./$(BIN)
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memcheck:
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valgrind --tool=memcheck --leak-check=full ./$(BIN)
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clean:
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rm ./$(BIN)

‎examples/list_pod_buffer/main.c

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#include <config/kube_config.h>
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#include <api/CoreV1API.h>
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#include <stdio.h>
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#define ENV_KUBECONFIG "KUBECONFIG"
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#ifndef _WIN32
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#define ENV_HOME "HOME"
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#else
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#define ENV_HOME "USERPROFILE"
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#endif
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#define KUBE_CONFIG_DEFAULT_LOCATION "%s/.kube/config"
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static char *getWorkingConfigFile(const char *configFileNamePassedIn)
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{
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char *configFileName = NULL;
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const char *kubeconfig_env = NULL;
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const char *homedir_env = NULL;
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if (configFileNamePassedIn) {
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configFileName = strdup(configFileNamePassedIn);
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} else {
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#if defined(HAVE_SECURE_GETENV)
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kubeconfig_env = secure_getenv(ENV_KUBECONFIG);
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#elif defined(HAVE_GETENV)
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kubeconfig_env = getenv(ENV_KUBECONFIG);
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#endif
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if (kubeconfig_env) {
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configFileName = strdup(kubeconfig_env);
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} else {
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#if defined(HAVE_SECURE_GETENV)
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homedir_env = secure_getenv(ENV_HOME);
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#elif defined(HAVE_GETENV)
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homedir_env = getenv(ENV_HOME);
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#endif
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if (homedir_env) {
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int configFileNameSize = strlen(homedir_env) + strlen(KUBE_CONFIG_DEFAULT_LOCATION) + 1;
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configFileName = calloc(configFileNameSize, sizeof(char));
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if (configFileName) {
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snprintf(configFileName, configFileNameSize, KUBE_CONFIG_DEFAULT_LOCATION, homedir_env);
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}
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}
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}
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}
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return configFileName;
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}
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static char *getFileData(const char *filePath)
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{
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char *data = NULL;
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char *kubeConfigFile = getWorkingConfigFile(filePath);
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if (kubeConfigFile) {
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FILE *kubeFile = fopen(kubeConfigFile, "r");
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if (kubeFile) {
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fseek(kubeFile, 0, SEEK_END);
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long fsize = ftell(kubeFile);
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fseek(kubeFile, 0, SEEK_SET);
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data = calloc(1, fsize + 1);
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if (data) {
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fread(data, 1, fsize, kubeFile);
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}
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fclose(kubeFile);
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}
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free(kubeConfigFile);
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}
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return data;
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}
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void list_pod(apiClient_t * apiClient)
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{
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v1_pod_list_t *pod_list = NULL;
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pod_list = CoreV1API_listNamespacedPod(apiClient, "default", /*namespace */
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NULL, /* pretty */
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NULL, /* allowWatchBookmarks */
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NULL, /* continue */
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NULL, /* fieldSelector */
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NULL, /* labelSelector */
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NULL, /* limit */
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NULL, /* resourceVersion */
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NULL, /* resourceVersionMatch */
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NULL, /* sendInitialEvents */
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NULL, /* timeoutSeconds */
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NULL /* watch */
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);
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printf("The return code of HTTP request=%ld\n", apiClient->response_code);
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if (pod_list) {
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printf("Get pod list:\n");
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listEntry_t *listEntry = NULL;
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v1_pod_t *pod = NULL;
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list_ForEach(listEntry, pod_list->items) {
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pod = listEntry->data;
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printf("\tThe pod name: %s\n", pod->metadata->name);
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}
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v1_pod_list_free(pod_list);
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pod_list = NULL;
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} else {
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printf("Cannot get any pod.\n");
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}
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}
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int main()
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{
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char *basePath = NULL;
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sslConfig_t *sslConfig = NULL;
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list_t *apiKeys = NULL;
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char *dataBuffer = getFileData(NULL); /* NULL means loading configuration from $HOME/.kube/config */
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if (dataBuffer == NULL) {
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printf("Cannot get kubernetes configuration from file.\n");
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return -1;
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}
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int rc = load_kube_config_buffer(&basePath, &sslConfig, &apiKeys, dataBuffer);
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if (rc != 0) {
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printf("Cannot load kubernetes configuration.\n");
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return -1;
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}
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apiClient_t *apiClient = apiClient_create_with_base_path(basePath, sslConfig, apiKeys);
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if (!apiClient) {
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printf("Cannot create a kubernetes client.\n");
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return -1;
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}
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list_pod(apiClient);
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apiClient_free(apiClient);
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apiClient = NULL;
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free_client_config(basePath, sslConfig, apiKeys);
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basePath = NULL;
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sslConfig = NULL;
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apiKeys = NULL;
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apiClient_unsetupGlobalEnv();
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free(dataBuffer);
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dataBuffer = NULL;
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return 0;
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}

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