static void on_initial_md_ready(grpc_exec_ctx *exec_ctx, void *user_data,
grpc_error *err) {
grpc_call_element *elem = (grpc_call_element *)user_data;
call_data *calld = (call_data *)elem->call_data;
if (err == GRPC_ERROR_NONE) {
if (calld->recv_initial_metadata->idx.named.path != NULL) {
calld->service_method = grpc_slice_ref_internal(
GRPC_MDVALUE(calld->recv_initial_metadata->idx.named.path->md));
calld->have_service_method = true;
} else {
err = grpc_error_add_child(
err, GRPC_ERROR_CREATE_FROM_STATIC_STRING("Missing :path header"));
}
if (calld->recv_initial_metadata->idx.named.lb_token != NULL) {
calld->initial_md_string = grpc_slice_ref_internal(
GRPC_MDVALUE(calld->recv_initial_metadata->idx.named.lb_token->md));
calld->have_initial_md_string = true;
grpc_metadata_batch_remove(
exec_ctx, calld->recv_initial_metadata,
calld->recv_initial_metadata->idx.named.lb_token);
}
} else {
GRPC_ERROR_REF(err);
}
calld->ops_recv_initial_metadata_ready->cb(
exec_ctx, calld->ops_recv_initial_metadata_ready->cb_arg, err);
GRPC_ERROR_UNREF(err);
}
static grpc_error *process_send_initial_metadata(
grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
grpc_metadata_batch *initial_metadata, bool *has_compression_algorithm) {
call_data *calld = elem->call_data;
channel_data *channeld = elem->channel_data;
*has_compression_algorithm = false;
/* Parse incoming request for compression. If any, it'll be available
* at calld->compression_algorithm */
if (initial_metadata->idx.named.grpc_internal_encoding_request != NULL) {
grpc_mdelem md =
initial_metadata->idx.named.grpc_internal_encoding_request->md;
if (!grpc_compression_algorithm_parse(GRPC_MDVALUE(md),
&calld->compression_algorithm)) {
char *val = grpc_slice_to_c_string(GRPC_MDVALUE(md));
gpr_log(GPR_ERROR,
"Invalid compression algorithm: '%s' (unknown). Ignoring.", val);
gpr_free(val);
calld->compression_algorithm = GRPC_COMPRESS_NONE;
}
if (!GPR_BITGET(channeld->enabled_algorithms_bitset,
calld->compression_algorithm)) {
char *val = grpc_slice_to_c_string(GRPC_MDVALUE(md));
gpr_log(GPR_ERROR,
"Invalid compression algorithm: '%s' (previously disabled). "
"Ignoring.",
val);
gpr_free(val);
calld->compression_algorithm = GRPC_COMPRESS_NONE;
}
*has_compression_algorithm = true;
grpc_metadata_batch_remove(
exec_ctx, initial_metadata,
initial_metadata->idx.named.grpc_internal_encoding_request);
} else {
/* If no algorithm was found in the metadata and we aren't
* exceptionally skipping compression, fall back to the channel
* default */
calld->compression_algorithm = channeld->default_compression_algorithm;
*has_compression_algorithm = true;
}
grpc_error *error = GRPC_ERROR_NONE;
/* hint compression algorithm */
if (calld->compression_algorithm != GRPC_COMPRESS_NONE) {
error = grpc_metadata_batch_add_tail(
exec_ctx, initial_metadata, &calld->compression_algorithm_storage,
grpc_compression_encoding_mdelem(calld->compression_algorithm));
}
if (error != GRPC_ERROR_NONE) return error;
/* convey supported compression algorithms */
error = grpc_metadata_batch_add_tail(
exec_ctx, initial_metadata, &calld->accept_encoding_storage,
GRPC_MDELEM_ACCEPT_ENCODING_FOR_ALGORITHMS(
channeld->supported_compression_algorithms));
return error;
}
