contrib/serf/buckets/barrier_buckets.c

   1 /* Copyright 2002-2004 Justin Erenkrantz and Greg Stein
   2  *
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 #include <apr_pools.h>
  17
  18 #include "serf.h"
  19 #include "serf_bucket_util.h"
  20
  21
  22 typedef struct {
  23     serf_bucket_t *stream;
  24 } barrier_context_t;
  25
  26
  27 serf_bucket_t *serf_bucket_barrier_create(
  28     serf_bucket_t *stream,
  29     serf_bucket_alloc_t *allocator)
  30 {
  31     barrier_context_t *ctx;
  32
  33     ctx = serf_bucket_mem_alloc(allocator, sizeof(*ctx));
  34     ctx->stream = stream;
  35
  36     return serf_bucket_create(&serf_bucket_type_barrier, allocator, ctx);
  37 }
  38
  39 static apr_status_t serf_barrier_read(serf_bucket_t *bucket,
  40                                      apr_size_t requested,
  41                                      const char **data, apr_size_t *len)
  42 {
  43     barrier_context_t *ctx = bucket->data;
  44
  45     return serf_bucket_read(ctx->stream, requested, data, len);
  46 }
  47
  48 static apr_status_t serf_barrier_read_iovec(serf_bucket_t *bucket,
  49                                             apr_size_t requested,
  50                                             int vecs_size, struct iovec *vecs,
  51                                             int *vecs_used)
  52 {
  53     barrier_context_t *ctx = bucket->data;
  54
  55     return serf_bucket_read_iovec(ctx->stream, requested, vecs_size, vecs,
  56                                   vecs_used);
  57 }
  58
  59 static apr_status_t serf_barrier_readline(serf_bucket_t *bucket,
  60                                          int acceptable, int *found,
  61                                          const char **data, apr_size_t *len)
  62 {
  63     barrier_context_t *ctx = bucket->data;
  64
  65     return serf_bucket_readline(ctx->stream, acceptable, found, data, len);
  66 }
  67
  68 static apr_status_t serf_barrier_peek(serf_bucket_t *bucket,
  69                                      const char **data,
  70                                      apr_size_t *len)
  71 {
  72     barrier_context_t *ctx = bucket->data;
  73
  74     return serf_bucket_peek(ctx->stream, data, len);
  75 }
  76
  77 static void serf_barrier_destroy(serf_bucket_t *bucket)
  78 {
  79     /* The intent of this bucket is not to let our wrapped buckets be
  80      * destroyed. */
  81
  82     /* The option is for us to go ahead and 'eat' this bucket now,
  83      * or just ignore the deletion entirely.
  84      */
  85     serf_default_destroy_and_data(bucket);
  86 }
  87
  88 const serf_bucket_type_t serf_bucket_type_barrier = {
  89     "BARRIER",
  90     serf_barrier_read,
  91     serf_barrier_readline,
  92     serf_barrier_read_iovec,
  93     serf_default_read_for_sendfile,
  94     serf_default_read_bucket,
  95     serf_barrier_peek,
  96     serf_barrier_destroy,
  97 };