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/*
*
* Copyright 2015 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <stdio.h>
#include <string.h>
#include <grpc/grpc.h>
#include <grpc/grpc_security.h>
#include <grpc/slice.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/sync.h>
#include "src/core/lib/gpr/string.h"
#include "src/core/lib/security/credentials/composite/composite_credentials.h"
#include "src/core/lib/security/credentials/credentials.h"
#include "src/core/lib/slice/slice_string_helpers.h"
#include "test/core/util/cmdline.h"
typedef struct {
gpr_mu* mu;
grpc_polling_entity pops;
bool is_done;
grpc_credentials_mdelem_array md_array;
grpc_closure on_request_metadata;
} synchronizer;
static void on_metadata_response(void* arg, grpc_error* error) {
synchronizer* sync = static_cast<synchronizer*>(arg);
if (error != GRPC_ERROR_NONE) {
fprintf(stderr, "Fetching token failed: %s\n", grpc_error_string(error));
fflush(stderr);
} else {
char* token;
GPR_ASSERT(sync->md_array.size == 1);
token = grpc_slice_to_c_string(GRPC_MDVALUE(sync->md_array.md[0]));
printf("\nGot token: %s\n\n", token);
gpr_free(token);
}
gpr_mu_lock(sync->mu);
sync->is_done = true;
GRPC_LOG_IF_ERROR(
"pollset_kick",
grpc_pollset_kick(grpc_polling_entity_pollset(&sync->pops), nullptr));
gpr_mu_unlock(sync->mu);
}
int main(int argc, char** argv) {
int result = 0;
grpc_core::ExecCtx exec_ctx;
synchronizer sync;
grpc_channel_credentials* creds = nullptr;
const char* service_url = "https://test.foo.google.com/Foo";
grpc_auth_metadata_context context;
gpr_cmdline* cl = gpr_cmdline_create("print_google_default_creds_token");
grpc_pollset* pollset = nullptr;
grpc_error* error = nullptr;
gpr_cmdline_add_string(cl, "service_url",
"Service URL for the token request.", &service_url);
gpr_cmdline_parse(cl, argc, argv);
memset(&context, 0, sizeof(context));
context.service_url = service_url;
grpc_init();
creds = grpc_google_default_credentials_create();
if (creds == nullptr) {
fprintf(stderr, "\nCould not find default credentials.\n\n");
fflush(stderr);
result = 1;
goto end;
}
memset(&sync, 0, sizeof(sync));
pollset = static_cast<grpc_pollset*>(gpr_zalloc(grpc_pollset_size()));
grpc_pollset_init(pollset, &sync.mu);
sync.pops = grpc_polling_entity_create_from_pollset(pollset);
sync.is_done = false;
GRPC_CLOSURE_INIT(&sync.on_request_metadata, on_metadata_response, &sync,
grpc_schedule_on_exec_ctx);
error = GRPC_ERROR_NONE;
if (grpc_call_credentials_get_request_metadata(
(reinterpret_cast<grpc_composite_channel_credentials*>(creds))
->call_creds,
&sync.pops, context, &sync.md_array, &sync.on_request_metadata,
&error)) {
// Synchronous response. Invoke callback directly.
on_metadata_response(&sync, error);
GRPC_ERROR_UNREF(error);
}
gpr_mu_lock(sync.mu);
while (!sync.is_done) {
grpc_pollset_worker* worker = nullptr;
if (!GRPC_LOG_IF_ERROR(
"pollset_work",
grpc_pollset_work(grpc_polling_entity_pollset(&sync.pops), &worker,
GRPC_MILLIS_INF_FUTURE)))
sync.is_done = true;
gpr_mu_unlock(sync.mu);
grpc_core::ExecCtx::Get()->Flush();
gpr_mu_lock(sync.mu);
}
gpr_mu_unlock(sync.mu);
grpc_channel_credentials_release(creds);
gpr_free(grpc_polling_entity_pollset(&sync.pops));
end:
gpr_cmdline_destroy(cl);
grpc_shutdown();
return result;
}
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