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/** @file
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you 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 "util.h"
#include "prefetch.h"
#include "HttpHeader.h"
#include "Config.h"
#include "Data.h"
void
shutdown(TSCont const contp, Data *const data)
{
DEBUG_LOG("shutting down transaction");
data->m_upstream.close();
data->m_dnstream.close();
TSContDataSet(contp, nullptr);
delete data;
TSContDestroy(contp);
}
void
abort(TSCont const contp, Data *const data)
{
DEBUG_LOG("aborting transaction");
data->m_upstream.abort();
data->m_dnstream.abort();
TSContDataSet(contp, nullptr);
delete data;
TSContDestroy(contp);
}
// create and issue a block request
bool
request_block(TSCont contp, Data *const data)
{
// ensure no upstream connection
if (data->m_upstream.m_read.isOpen()) {
ERROR_LOG("Block request already in flight!");
return false;
}
switch (data->m_blockstate) {
case BlockState::Pending:
case BlockState::PendingInt:
case BlockState::PendingRef:
break;
default:
ERROR_LOG("request_block called with non Pending* state!");
return false;
break;
}
int64_t const blockbeg = (data->m_config->m_blockbytes * data->m_blocknum);
Range blockbe(blockbeg, blockbeg + data->m_config->m_blockbytes);
char rangestr[1024];
int rangelen = sizeof(rangestr);
bool const rpstat = blockbe.toStringClosed(rangestr, &rangelen);
TSAssert(rpstat);
DEBUG_LOG("requestBlock: %s", rangestr);
// reuse the incoming client header, just change the range
HttpHeader header(data->m_req_hdrmgr.m_buffer, data->m_req_hdrmgr.m_lochdr);
// if configured, remove range header from head requests
if (data->m_method_type == TS_HTTP_METHOD_HEAD && data->m_config->m_head_strip_range) {
header.removeKey(TS_MIME_FIELD_RANGE, TS_MIME_LEN_RANGE);
} else {
// add/set sub range key and add slicer tag
bool const rangestat = header.setKeyVal(TS_MIME_FIELD_RANGE, TS_MIME_LEN_RANGE, rangestr, rangelen);
if (!rangestat) {
ERROR_LOG("Error trying to set range request header %s", rangestr);
return false;
}
}
header.removeKey(SLICE_CRR_HEADER.data(), SLICE_CRR_HEADER.size());
if (data->m_config->m_prefetchcount > 0 && data->m_req_range.m_beg >= 0 &&
data->m_blocknum == data->m_req_range.firstBlockFor(data->m_config->m_blockbytes)) {
header.setKeyVal(SLICE_CRR_HEADER.data(), SLICE_CRR_HEADER.size(), SLICE_CRR_VAL.data(), SLICE_CRR_VAL.size());
}
// create virtual connection back into ATS
TSHttpConnectOptions options = TSHttpConnectOptionsGet(TS_CONNECT_PLUGIN);
options.addr = reinterpret_cast<sockaddr *>(&data->m_client_ip);
options.tag = PLUGIN_NAME;
options.id = 0;
options.buffer_index = data->m_buffer_index;
options.buffer_water_mark = data->m_buffer_water_mark;
TSVConn const upvc = TSHttpConnectPlugin(&options);
int const hlen = TSHttpHdrLengthGet(header.m_buffer, header.m_lochdr);
// set up connection with the HttpConnect server
data->m_upstream.setupConnection(upvc);
data->m_upstream.setupVioWrite(contp, hlen);
// Send full request
TSHttpHdrPrint(header.m_buffer, header.m_lochdr, data->m_upstream.m_write.m_iobuf);
TSVIOReenable(data->m_upstream.m_write.m_vio);
if (TSIsDebugTagSet(PLUGIN_NAME)) {
std::string const headerstr(header.toString());
DEBUG_LOG("Headers\n%s", headerstr.c_str());
}
// if prefetch config set, schedule next block requests in background
if (data->m_prefetchable && data->m_config->m_prefetchcount > 0) {
int nextblocknum = data->m_blocknum + 1;
if (data->m_blocknum > data->m_req_range.firstBlockFor(data->m_config->m_blockbytes) + 1) {
nextblocknum = data->m_blocknum + data->m_config->m_prefetchcount;
}
for (int i = nextblocknum; i <= data->m_blocknum + data->m_config->m_prefetchcount; i++) {
if (data->m_req_range.blockIsInside(data->m_config->m_blockbytes, i)) {
if (BgBlockFetch::schedule(data, i)) {
DEBUG_LOG("Background fetch requested");
} else {
DEBUG_LOG("Background fetch not requested");
}
}
}
}
// get ready for data back from the server
data->m_upstream.setupVioRead(contp, INT64_MAX);
// anticipate the next server response header
TSHttpParserClear(data->m_http_parser);
data->m_resp_hdrmgr.resetHeader();
data->m_blockexpected = 0;
data->m_blockconsumed = 0;
data->m_server_block_header_parsed = false;
switch (data->m_blockstate) {
case BlockState::Pending:
data->m_blockstate = BlockState::Active;
break;
case BlockState::PendingInt: {
data->m_blockstate = BlockState::ActiveInt;
Config const *const conf = data->m_config;
header.removeKey(conf->m_crr_ims_header.c_str(), conf->m_crr_ims_header.size());
} break;
case BlockState::PendingRef: {
data->m_blockstate = BlockState::ActiveRef;
Config const *const conf = data->m_config;
header.removeKey(conf->m_crr_ims_header.c_str(), conf->m_crr_ims_header.size());
} break;
default:
ERROR_LOG("Invalid blockstate");
return false;
break;
}
return true;
}
bool
reader_avail_more_than(TSIOBufferReader const reader, int64_t bytes)
{
TSIOBufferBlock block = TSIOBufferReaderStart(reader);
if (nullptr == block) {
return false;
}
while (nullptr != block) {
int64_t const blockbytes = TSIOBufferBlockReadAvail(block, reader);
if (bytes < blockbytes) {
return true;
} else {
bytes -= blockbytes;
}
block = TSIOBufferBlockNext(block);
}
return false;
}
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