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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 "src/core/ext/transport/chttp2/transport/frame_rst_stream.h"
#include "src/core/ext/transport/chttp2/transport/internal.h"
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/string_util.h>
#include "src/core/ext/transport/chttp2/transport/frame.h"
#include "src/core/lib/transport/http2_errors.h"
grpc_slice grpc_chttp2_rst_stream_create(uint32_t id, uint32_t code,
grpc_transport_one_way_stats *stats) {
static const size_t frame_size = 13;
grpc_slice slice = GRPC_SLICE_MALLOC(frame_size);
stats->framing_bytes += frame_size;
uint8_t *p = GRPC_SLICE_START_PTR(slice);
// Frame size.
*p++ = 0;
*p++ = 0;
*p++ = 4;
// Frame type.
*p++ = GRPC_CHTTP2_FRAME_RST_STREAM;
// Flags.
*p++ = 0;
// Stream ID.
*p++ = (uint8_t)(id >> 24);
*p++ = (uint8_t)(id >> 16);
*p++ = (uint8_t)(id >> 8);
*p++ = (uint8_t)(id);
// Error code.
*p++ = (uint8_t)(code >> 24);
*p++ = (uint8_t)(code >> 16);
*p++ = (uint8_t)(code >> 8);
*p++ = (uint8_t)(code);
return slice;
}
grpc_error *grpc_chttp2_rst_stream_parser_begin_frame(
grpc_chttp2_rst_stream_parser *parser, uint32_t length, uint8_t flags) {
if (length != 4) {
char *msg;
gpr_asprintf(&msg, "invalid rst_stream: length=%d, flags=%02x", length,
flags);
grpc_error *err = GRPC_ERROR_CREATE_FROM_COPIED_STRING(msg);
gpr_free(msg);
return err;
}
parser->byte = 0;
return GRPC_ERROR_NONE;
}
grpc_error *grpc_chttp2_rst_stream_parser_parse(grpc_exec_ctx *exec_ctx,
void *parser,
grpc_chttp2_transport *t,
grpc_chttp2_stream *s,
grpc_slice slice, int is_last) {
uint8_t *const beg = GRPC_SLICE_START_PTR(slice);
uint8_t *const end = GRPC_SLICE_END_PTR(slice);
uint8_t *cur = beg;
grpc_chttp2_rst_stream_parser *p = (grpc_chttp2_rst_stream_parser *)parser;
while (p->byte != 4 && cur != end) {
p->reason_bytes[p->byte] = *cur;
cur++;
p->byte++;
}
s->stats.incoming.framing_bytes += (uint64_t)(end - cur);
if (p->byte == 4) {
GPR_ASSERT(is_last);
uint32_t reason = (((uint32_t)p->reason_bytes[0]) << 24) |
(((uint32_t)p->reason_bytes[1]) << 16) |
(((uint32_t)p->reason_bytes[2]) << 8) |
(((uint32_t)p->reason_bytes[3]));
grpc_error *error = GRPC_ERROR_NONE;
if (reason != GRPC_HTTP2_NO_ERROR || s->metadata_buffer[1].size == 0) {
char *message;
gpr_asprintf(&message, "Received RST_STREAM with error code %d", reason);
error = grpc_error_set_int(
grpc_error_set_str(GRPC_ERROR_CREATE_FROM_STATIC_STRING("RST_STREAM"),
GRPC_ERROR_STR_GRPC_MESSAGE,
grpc_slice_from_copied_string(message)),
GRPC_ERROR_INT_HTTP2_ERROR, (intptr_t)reason);
gpr_free(message);
}
grpc_chttp2_mark_stream_closed(exec_ctx, t, s, true, true, error);
}
return GRPC_ERROR_NONE;
}
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