grpc_channel_credentials *grpc_google_default_credentials_create(void) {
grpc_channel_credentials *result = NULL;
grpc_call_credentials *call_creds = NULL;
GRPC_API_TRACE("grpc_google_default_credentials_create(void)", 0, ());
gpr_once_init(&g_once, init_default_credentials);
gpr_mu_lock(&g_mu);
if (default_credentials != NULL) {
result = grpc_channel_credentials_ref(default_credentials);
goto end;
}
/* First, try the environment variable. */
call_creds = create_default_creds_from_path(
gpr_getenv(GRPC_GOOGLE_CREDENTIALS_ENV_VAR));
if (call_creds != NULL) goto end;
/* Then the well-known file. */
call_creds = create_default_creds_from_path(
grpc_get_well_known_google_credentials_file_path());
if (call_creds != NULL) goto end;
/* At last try to see if we're on compute engine (do the detection only once
since it requires a network test). */
if (!compute_engine_detection_done) {
int need_compute_engine_creds = is_stack_running_on_compute_engine();
compute_engine_detection_done = 1;
if (need_compute_engine_creds) {
call_creds = grpc_google_compute_engine_credentials_create(NULL);
}
}
end:
if (result == NULL) {
if (call_creds != NULL) {
/* Blend with default ssl credentials and add a global reference so that
it
can be cached and re-served. */
grpc_channel_credentials *ssl_creds =
grpc_ssl_credentials_create(NULL, NULL, NULL);
default_credentials = grpc_channel_credentials_ref(
grpc_composite_channel_credentials_create(ssl_creds, call_creds,
NULL));
GPR_ASSERT(default_credentials != NULL);
grpc_channel_credentials_unref(ssl_creds);
grpc_call_credentials_unref(call_creds);
result = default_credentials;
} else {
gpr_log(GPR_ERROR, "Could not create google default credentials.");
}
}
gpr_mu_unlock(&g_mu);
return result;
}
grpc_channel_credentials *grpc_google_default_credentials_create(void) {
grpc_channel_credentials *result = NULL;
grpc_call_credentials *call_creds = NULL;
grpc_error *error = GRPC_ERROR_CREATE("Failed to create Google credentials");
grpc_error *err;
grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
GRPC_API_TRACE("grpc_google_default_credentials_create(void)", 0, ());
gpr_once_init(&g_once, init_default_credentials);
gpr_mu_lock(&g_state_mu);
if (default_credentials != NULL) {
result = grpc_channel_credentials_ref(default_credentials);
goto end;
}
/* First, try the environment variable. */
err = create_default_creds_from_path(
&exec_ctx, gpr_getenv(GRPC_GOOGLE_CREDENTIALS_ENV_VAR), &call_creds);
if (err == GRPC_ERROR_NONE) goto end;
error = grpc_error_add_child(error, err);
/* Then the well-known file. */
err = create_default_creds_from_path(
&exec_ctx, grpc_get_well_known_google_credentials_file_path(),
&call_creds);
if (err == GRPC_ERROR_NONE) goto end;
error = grpc_error_add_child(error, err);
/* At last try to see if we're on compute engine (do the detection only once
since it requires a network test). */
if (!compute_engine_detection_done) {
int need_compute_engine_creds =
is_stack_running_on_compute_engine(&exec_ctx);
compute_engine_detection_done = 1;
if (need_compute_engine_creds) {
call_creds = grpc_google_compute_engine_credentials_create(NULL);
if (call_creds == NULL) {
error = grpc_error_add_child(
error, GRPC_ERROR_CREATE("Failed to get credentials from network"));
}
}
}
end:
if (result == NULL) {
if (call_creds != NULL) {
/* Blend with default ssl credentials and add a global reference so that
it
can be cached and re-served. */
grpc_channel_credentials *ssl_creds =
grpc_ssl_credentials_create(NULL, NULL, NULL);
default_credentials = grpc_channel_credentials_ref(
grpc_composite_channel_credentials_create(ssl_creds, call_creds,
NULL));
GPR_ASSERT(default_credentials != NULL);
grpc_channel_credentials_unref(&exec_ctx, ssl_creds);
grpc_call_credentials_unref(&exec_ctx, call_creds);
result = default_credentials;
} else {
gpr_log(GPR_ERROR, "Could not create google default credentials.");
}
}
gpr_mu_unlock(&g_state_mu);
if (result == NULL) {
GRPC_LOG_IF_ERROR("grpc_google_default_credentials_create", error);
} else {
GRPC_ERROR_UNREF(error);
}
grpc_exec_ctx_finish(&exec_ctx);
return result;
}