236 lines
6.7 KiB
C
236 lines
6.7 KiB
C
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/* Copyright 2002-2004 Justin Erenkrantz and Greg Stein
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <apr_pools.h>
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#include <apr_strings.h>
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#include "serf.h"
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#include "serf_bucket_util.h"
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typedef struct {
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enum {
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STATE_FETCH,
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STATE_CHUNK,
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STATE_EOF
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} state;
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apr_status_t last_status;
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serf_bucket_t *chunk;
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serf_bucket_t *stream;
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char chunk_hdr[20];
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} chunk_context_t;
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serf_bucket_t *serf_bucket_chunk_create(
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serf_bucket_t *stream, serf_bucket_alloc_t *allocator)
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{
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chunk_context_t *ctx;
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ctx = serf_bucket_mem_alloc(allocator, sizeof(*ctx));
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ctx->state = STATE_FETCH;
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ctx->chunk = serf_bucket_aggregate_create(allocator);
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ctx->stream = stream;
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return serf_bucket_create(&serf_bucket_type_chunk, allocator, ctx);
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}
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#define CRLF "\r\n"
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static apr_status_t create_chunk(serf_bucket_t *bucket)
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{
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chunk_context_t *ctx = bucket->data;
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serf_bucket_t *simple_bkt;
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apr_size_t chunk_len;
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apr_size_t stream_len;
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struct iovec vecs[66]; /* 64 + chunk trailer + EOF trailer = 66 */
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int vecs_read;
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int i;
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if (ctx->state != STATE_FETCH) {
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return APR_SUCCESS;
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}
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ctx->last_status =
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serf_bucket_read_iovec(ctx->stream, SERF_READ_ALL_AVAIL,
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64, vecs, &vecs_read);
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if (SERF_BUCKET_READ_ERROR(ctx->last_status)) {
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/* Uh-oh. */
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return ctx->last_status;
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}
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/* Count the length of the data we read. */
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stream_len = 0;
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for (i = 0; i < vecs_read; i++) {
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stream_len += vecs[i].iov_len;
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}
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/* assert: stream_len in hex < sizeof(ctx->chunk_hdr) */
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/* Inserting a 0 byte chunk indicates a terminator, which already happens
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* during the EOF handler below. Adding another one here will cause the
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* EOF chunk to be interpreted by the server as a new request. So,
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* we'll only do this if we have something to write.
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*/
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if (stream_len) {
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/* Build the chunk header. */
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chunk_len = apr_snprintf(ctx->chunk_hdr, sizeof(ctx->chunk_hdr),
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"%" APR_UINT64_T_HEX_FMT CRLF,
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(apr_uint64_t)stream_len);
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/* Create a copy of the chunk header so we can have multiple chunks
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* in the pipeline at the same time.
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*/
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simple_bkt = serf_bucket_simple_copy_create(ctx->chunk_hdr, chunk_len,
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bucket->allocator);
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serf_bucket_aggregate_append(ctx->chunk, simple_bkt);
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/* Insert the chunk footer. */
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vecs[vecs_read].iov_base = CRLF;
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vecs[vecs_read++].iov_len = sizeof(CRLF) - 1;
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}
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/* We've reached the end of the line for the stream. */
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if (APR_STATUS_IS_EOF(ctx->last_status)) {
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/* Insert the chunk footer. */
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vecs[vecs_read].iov_base = "0" CRLF CRLF;
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vecs[vecs_read++].iov_len = sizeof("0" CRLF CRLF) - 1;
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ctx->state = STATE_EOF;
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}
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else {
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/* Okay, we can return data. */
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ctx->state = STATE_CHUNK;
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}
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serf_bucket_aggregate_append_iovec(ctx->chunk, vecs, vecs_read);
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return APR_SUCCESS;
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}
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static apr_status_t serf_chunk_read(serf_bucket_t *bucket,
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apr_size_t requested,
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const char **data, apr_size_t *len)
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{
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chunk_context_t *ctx = bucket->data;
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apr_status_t status;
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/* Before proceeding, we need to fetch some data from the stream. */
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if (ctx->state == STATE_FETCH) {
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status = create_chunk(bucket);
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if (status) {
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return status;
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}
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}
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status = serf_bucket_read(ctx->chunk, requested, data, len);
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/* Mask EOF from aggregate bucket. */
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if (APR_STATUS_IS_EOF(status) && ctx->state == STATE_CHUNK) {
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status = ctx->last_status;
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ctx->state = STATE_FETCH;
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}
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return status;
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}
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static apr_status_t serf_chunk_readline(serf_bucket_t *bucket,
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int acceptable, int *found,
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const char **data, apr_size_t *len)
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{
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chunk_context_t *ctx = bucket->data;
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apr_status_t status;
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status = serf_bucket_readline(ctx->chunk, acceptable, found, data, len);
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/* Mask EOF from aggregate bucket. */
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if (APR_STATUS_IS_EOF(status) && ctx->state == STATE_CHUNK) {
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status = APR_EAGAIN;
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ctx->state = STATE_FETCH;
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}
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return status;
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}
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static apr_status_t serf_chunk_read_iovec(serf_bucket_t *bucket,
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apr_size_t requested,
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int vecs_size,
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struct iovec *vecs,
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int *vecs_used)
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{
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chunk_context_t *ctx = bucket->data;
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apr_status_t status;
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/* Before proceeding, we need to fetch some data from the stream. */
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if (ctx->state == STATE_FETCH) {
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status = create_chunk(bucket);
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if (status) {
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return status;
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}
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}
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status = serf_bucket_read_iovec(ctx->chunk, requested, vecs_size, vecs,
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vecs_used);
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/* Mask EOF from aggregate bucket. */
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if (APR_STATUS_IS_EOF(status) && ctx->state == STATE_CHUNK) {
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status = ctx->last_status;
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ctx->state = STATE_FETCH;
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}
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return status;
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}
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static apr_status_t serf_chunk_peek(serf_bucket_t *bucket,
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const char **data,
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apr_size_t *len)
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{
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chunk_context_t *ctx = bucket->data;
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apr_status_t status;
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status = serf_bucket_peek(ctx->chunk, data, len);
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/* Mask EOF from aggregate bucket. */
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if (APR_STATUS_IS_EOF(status) && ctx->state == STATE_CHUNK) {
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status = APR_EAGAIN;
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}
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return status;
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}
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static void serf_chunk_destroy(serf_bucket_t *bucket)
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{
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chunk_context_t *ctx = bucket->data;
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serf_bucket_destroy(ctx->stream);
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serf_bucket_destroy(ctx->chunk);
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serf_default_destroy_and_data(bucket);
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}
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const serf_bucket_type_t serf_bucket_type_chunk = {
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"CHUNK",
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serf_chunk_read,
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serf_chunk_readline,
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serf_chunk_read_iovec,
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serf_default_read_for_sendfile,
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serf_default_read_bucket,
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serf_chunk_peek,
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serf_chunk_destroy,
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};
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