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/*
* Phusion Passenger - https://www.phusionpassenger.com/
* Copyright (c) 2010-2017 Phusion Holding B.V.
*
* "Passenger", "Phusion Passenger" and "Union Station" are registered
* trademarks of Phusion Holding B.V.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <boost/make_shared.hpp>
#include "Bucket.h"
namespace Passenger {
namespace Apache2Module {
static void bucket_destroy(void *data);
static apr_status_t bucket_read(apr_bucket *a, const char **str, apr_size_t *len, apr_read_type_e block);
static const apr_bucket_type_t apr_bucket_type_passenger_pipe = {
"PASSENGER_PIPE",
5,
apr_bucket_type_t::APR_BUCKET_DATA,
bucket_destroy,
bucket_read,
apr_bucket_setaside_notimpl,
apr_bucket_split_notimpl,
apr_bucket_copy_notimpl
};
struct BucketData {
FileDescriptor fd;
PassengerBucketStatePtr state;
bool bufferResponse;
};
static void
bucket_destroy(void *data) {
BucketData *bucket_data = (BucketData *) data;
if (data != NULL) {
delete bucket_data;
}
}
static apr_status_t
bucket_read(apr_bucket *bucket, const char **str, apr_size_t *len, apr_read_type_e block) {
char *buf;
ssize_t ret;
BucketData *data;
data = (BucketData *) bucket->data;
*str = NULL;
*len = 0;
if (!data->bufferResponse && block == APR_NONBLOCK_READ) {
/*
* The bucket brigade that Hooks::handleRequest() passes using
* ap_pass_brigade() is always passed through ap_content_length_filter,
* which is a filter which attempts to read all data from the
* bucket brigade and computes the Content-Length header from
* that. We don't want this to happen; because suppose that the
* Rails application sends back 1 GB of data, then
* ap_content_length_filter will buffer this entire 1 GB of data
* in memory before passing it to the HTTP client.
*
* ap_content_length_filter aborts and passes the bucket brigade
* down the filter chain when it encounters an APR_EAGAIN, except
* for the first read. So by returning APR_EAGAIN on every
* non-blocking read request, we can prevent ap_content_length_filter
* from buffering all data.
*/
return APR_EAGAIN;
}
buf = (char *) apr_bucket_alloc(APR_BUCKET_BUFF_SIZE, bucket->list);
if (buf == NULL) {
return APR_ENOMEM;
}
do {
ret = read(data->state->connection, buf, APR_BUCKET_BUFF_SIZE);
} while (ret == -1 && errno == EINTR);
if (ret > 0) {
apr_bucket_heap *h;
data->state->bytesRead += ret;
*str = buf;
*len = ret;
bucket->data = NULL;
/* Change the current bucket (which is a Passenger Bucket) into a heap bucket
* that contains the data that we just read. This newly created heap bucket
* will be the first in the bucket list.
*/
bucket = apr_bucket_heap_make(bucket, buf, *len, apr_bucket_free);
h = (apr_bucket_heap *) bucket->data;
h->alloc_len = APR_BUCKET_BUFF_SIZE; /* note the real buffer size */
/* And after this newly created bucket we insert a new Passenger Bucket
* which can read the next chunk from the stream.
*/
APR_BUCKET_INSERT_AFTER(bucket, passenger_bucket_create(
data->state, bucket->list, data->bufferResponse));
/* The newly created Passenger Bucket has a reference to the session
* object, so we can delete data here.
*/
delete data;
return APR_SUCCESS;
} else if (ret == 0) {
data->state->completed = true;
delete data;
bucket->data = NULL;
apr_bucket_free(buf);
bucket = apr_bucket_immortal_make(bucket, "", 0);
*str = (const char *) bucket->data;
*len = 0;
return APR_SUCCESS;
} else /* ret == -1 */ {
int e = errno;
data->state->completed = true;
data->state->errorCode = e;
delete data;
bucket->data = NULL;
apr_bucket_free(buf);
return APR_FROM_OS_ERROR(e);
}
}
static apr_bucket *
passenger_bucket_make(apr_bucket *bucket, const PassengerBucketStatePtr &state, bool bufferResponse) {
BucketData *data = new BucketData();
data->state = state;
data->bufferResponse = bufferResponse;
bucket->type = &apr_bucket_type_passenger_pipe;
bucket->length = (apr_size_t)(-1);
bucket->start = -1;
bucket->data = data;
return bucket;
}
apr_bucket *
passenger_bucket_create(const PassengerBucketStatePtr &state, apr_bucket_alloc_t *list, bool bufferResponse) {
apr_bucket *bucket;
bucket = (apr_bucket *) apr_bucket_alloc(sizeof(*bucket), list);
APR_BUCKET_INIT(bucket);
bucket->free = apr_bucket_free;
bucket->list = list;
return passenger_bucket_make(bucket, state, bufferResponse);
}
} // namespace Apache2Module
} // namespace Passenger
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