/
Transform.cc
1218 lines (955 loc) · 35.2 KB
/
Transform.cc
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/** @file
A brief file description
@section license License
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.
@section thoughts Transform thoughts
- Must be able to handle a chain of transformations.
- Any transformation in the chain may fail.
Failure options:
- abort the client (if transformed data already sent)
- serve the client the untransformed document
- remove the failing transformation from the chain and attempt the transformation again (difficult to do)
- never send untransformed document to client if client would not understand it (e.g. a set top box)
- Must be able to change response header fields up until the point that TRANSFORM_READ_READY is sent to the user.
@section usage Transform usage
-# transformProcessor.open (cont, hooks); - returns "tvc", a TransformVConnection if 'hooks != NULL'
-# tvc->do_io_write (cont, nbytes, buffer1);
-# cont->handleEvent (TRANSFORM_READ_READY, NULL);
-# tvc->do_io_read (cont, nbytes, buffer2);
-# tvc->do_io_close ();
@section visualization Transform visualization
@verbatim
+----+ +----+ +----+ +----+
-IB->| T1 |-B1->| T2 |-B2->| T3 |-B3->| T4 |-OB->
+----+ +----+ +----+ +----+
@endverbatim
Data flows into the first transform in the form of the buffer
passed to TransformVConnection::do_io_write (IB). Data flows
out of the last transform in the form of the buffer passed to
TransformVConnection::do_io_read (OB). Between each transformation is
another buffer (B1, B2 and B3).
A transformation is a Continuation. The continuation is called with the
event TRANSFORM_IO_WRITE to initialize the write and TRANSFORM_IO_READ
to initialize the read.
*/
#ifndef TS_NO_TRANSFORM
#include "ProxyConfig.h"
#include "P_Net.h"
#include "MimeTable.h"
#include "TransformInternal.h"
#include "HttpMessageBody.h"
#include "HdrUtils.h"
#include "Log.h"
#define ART 1
#define AGIF 2
TransformProcessor transformProcessor;
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
void
TransformProcessor::start()
{
#ifdef PREFETCH
prefetchProcessor.start();
#endif
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
VConnection *
TransformProcessor::open(Continuation *cont, APIHook *hooks)
{
if (hooks) {
return NEW(new TransformVConnection(cont, hooks));
} else {
return NULL;
}
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
INKVConnInternal *
TransformProcessor::null_transform(ProxyMutex *mutex)
{
return NEW(new NullTransform(mutex));
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
INKVConnInternal *
TransformProcessor::range_transform(ProxyMutex *mut, MIMEField *range_field, HTTPInfo *cache_obj, HTTPHdr *transform_resp, bool & b)
{
RangeTransform *range_transform = NEW(new RangeTransform(mut, range_field, cache_obj, transform_resp));
b = range_transform->is_range_unsatisfiable();
if (b || range_transform->is_this_range_not_handled()) {
delete range_transform;
return NULL;
}
return range_transform;
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
TransformTerminus::TransformTerminus(TransformVConnection *tvc)
: VConnection(tvc->mutex),
m_tvc(tvc), m_read_vio(), m_write_vio(), m_event_count(0), m_deletable(0), m_closed(0), m_called_user(0)
{
SET_HANDLER(&TransformTerminus::handle_event);
}
#define RETRY() \
if (ink_atomic_increment ((int*) &m_event_count, 1) < 0) { \
ink_assert (!"not reached"); \
} \
eventProcessor.schedule_in (this, HRTIME_MSECONDS (10), ET_NET); \
return 0;
int
TransformTerminus::handle_event(int event, void *edata)
{
NOWARN_UNUSED(edata);
int val;
m_deletable = ((m_closed != 0) && (m_tvc->m_closed != 0));
val = ink_atomic_increment((int *) &m_event_count, -1);
Debug("transform", "[TransformTerminus::handle_event] event_count %d", m_event_count);
if (val <= 0) {
ink_assert(!"not reached");
}
m_deletable = m_deletable && (val == 1);
if (m_closed != 0 && m_tvc->m_closed != 0) {
if (m_deletable) {
Debug("transform", "TransformVConnection destroy [0x%lx]", (long) m_tvc);
delete m_tvc;
return 0;
}
} else if (m_write_vio.op == VIO::WRITE) {
if (m_read_vio.op == VIO::NONE) {
if (!m_called_user) {
Debug("transform", "TransformVConnection calling user: %d %d [0x%lx] [0x%lx]",
m_event_count, event, (long) m_tvc, (long) m_tvc->m_cont);
m_called_user = 1;
// It is our belief this is safe to pass a reference, i.e. its scope
// and locking ought to be safe across the lifetime of the continuation.
m_tvc->m_cont->handleEvent(TRANSFORM_READ_READY, (void *)&m_write_vio.nbytes);
}
} else {
int64_t towrite;
MUTEX_TRY_LOCK(trylock1, m_write_vio.mutex, this_ethread());
if (!trylock1) {
RETRY();
}
MUTEX_TRY_LOCK(trylock2, m_read_vio.mutex, this_ethread());
if (!trylock2) {
RETRY();
}
if (m_closed != 0) {
return 0;
}
if (m_write_vio.op == VIO::NONE) {
return 0;
}
towrite = m_write_vio.ntodo();
if (towrite > 0) {
if (towrite > m_write_vio.get_reader()->read_avail()) {
towrite = m_write_vio.get_reader()->read_avail();
}
if (towrite > m_read_vio.ntodo()) {
towrite = m_read_vio.ntodo();
}
if (towrite > 0) {
m_read_vio.get_writer()->write(m_write_vio.get_reader(), towrite);
m_read_vio.ndone += towrite;
m_write_vio.get_reader()->consume(towrite);
m_write_vio.ndone += towrite;
}
}
if (m_write_vio.ntodo() > 0) {
if (towrite > 0) {
m_write_vio._cont->handleEvent(VC_EVENT_WRITE_READY, &m_write_vio);
}
} else {
m_write_vio._cont->handleEvent(VC_EVENT_WRITE_COMPLETE, &m_write_vio);
}
// We could have closed on the write callback
if (m_closed != 0 && m_tvc->m_closed != 0) {
return 0;
}
if (m_read_vio.ntodo() > 0) {
if (m_write_vio.ntodo() <= 0) {
m_read_vio._cont->handleEvent(VC_EVENT_EOS, &m_read_vio);
} else if (towrite > 0) {
m_read_vio._cont->handleEvent(VC_EVENT_READ_READY, &m_read_vio);
}
} else {
m_read_vio._cont->handleEvent(VC_EVENT_READ_COMPLETE, &m_read_vio);
}
}
} else {
MUTEX_TRY_LOCK(trylock2, m_read_vio.mutex, this_ethread());
if (!trylock2) {
RETRY();
}
if (m_closed != 0) {
// The terminus was closed, but the enclosing transform
// vconnection wasn't. If the terminus was aborted then we
// call the read_vio cont back with VC_EVENT_ERROR. If it
// was closed normally then we call it back with
// VC_EVENT_EOS. If a read operation hasn't been initiated
// yet and we haven't called the user back then we call
// the user back instead of the read_vio cont (which won't
// exist).
if (m_tvc->m_closed == 0) {
if (m_closed == TS_VC_CLOSE_ABORT) {
if (m_read_vio.op == VIO::NONE) {
if (!m_called_user) {
m_called_user = 1;
m_tvc->m_cont->handleEvent(VC_EVENT_ERROR, NULL);
}
} else {
m_read_vio._cont->handleEvent(VC_EVENT_ERROR, &m_read_vio);
}
} else {
if (m_read_vio.op == VIO::NONE) {
if (!m_called_user) {
m_called_user = 1;
m_tvc->m_cont->handleEvent(VC_EVENT_EOS, NULL);
}
} else {
m_read_vio._cont->handleEvent(VC_EVENT_EOS, &m_read_vio);
}
}
}
return 0;
}
}
return 0;
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
VIO *
TransformTerminus::do_io_read(Continuation *c, int64_t nbytes, MIOBuffer *buf)
{
m_read_vio.buffer.writer_for(buf);
m_read_vio.op = VIO::READ;
m_read_vio.set_continuation(c);
m_read_vio.nbytes = nbytes;
m_read_vio.ndone = 0;
m_read_vio.vc_server = this;
if (ink_atomic_increment((int *) &m_event_count, 1) < 0) {
ink_assert(!"not reached");
}
Debug("transform", "[TransformTerminus::do_io_read] event_count %d", m_event_count);
eventProcessor.schedule_imm(this, ET_NET);
return &m_read_vio;
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
VIO *
TransformTerminus::do_io_write(Continuation *c, int64_t nbytes, IOBufferReader *buf, bool owner)
{
// In the process of eliminating 'owner' mode so asserting against it
ink_assert(!owner);
m_write_vio.buffer.reader_for(buf);
m_write_vio.op = VIO::WRITE;
m_write_vio.set_continuation(c);
m_write_vio.nbytes = nbytes;
m_write_vio.ndone = 0;
m_write_vio.vc_server = this;
if (ink_atomic_increment((int *) &m_event_count, 1) < 0) {
ink_assert(!"not reached");
}
Debug("transform", "[TransformTerminus::do_io_write] event_count %d", m_event_count);
eventProcessor.schedule_imm(this, ET_NET);
return &m_write_vio;
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
void
TransformTerminus::do_io_close(int error)
{
if (ink_atomic_increment((int *) &m_event_count, 1) < 0) {
ink_assert(!"not reached");
}
INK_WRITE_MEMORY_BARRIER;
if (error != -1) {
lerrno = error;
m_closed = TS_VC_CLOSE_ABORT;
} else {
m_closed = TS_VC_CLOSE_NORMAL;
}
m_read_vio.op = VIO::NONE;
m_read_vio.buffer.clear();
m_write_vio.op = VIO::NONE;
m_write_vio.buffer.clear();
eventProcessor.schedule_imm(this, ET_NET);
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
void
TransformTerminus::do_io_shutdown(ShutdownHowTo_t howto)
{
if ((howto == IO_SHUTDOWN_READ) || (howto == IO_SHUTDOWN_READWRITE)) {
m_read_vio.op = VIO::NONE;
m_read_vio.buffer.clear();
}
if ((howto == IO_SHUTDOWN_WRITE) || (howto == IO_SHUTDOWN_READWRITE)) {
m_write_vio.op = VIO::NONE;
m_write_vio.buffer.clear();
}
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
void
TransformTerminus::reenable(VIO *vio)
{
ink_assert((vio == &m_read_vio) || (vio == &m_write_vio));
if (m_event_count == 0) {
if (ink_atomic_increment((int *) &m_event_count, 1) < 0) {
ink_assert(!"not reached");
}
Debug("transform", "[TransformTerminus::reenable] event_count %d", m_event_count);
eventProcessor.schedule_imm(this, ET_NET);
} else {
Debug("transform", "[TransformTerminus::reenable] skipping due to " "pending events");
}
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
TransformVConnection::TransformVConnection(Continuation *cont, APIHook *hooks)
:VConnection(cont->mutex), m_cont(cont), m_terminus(this), m_closed(0)
{
INKVConnInternal *xform;
SET_HANDLER(&TransformVConnection::handle_event);
ink_assert(hooks != NULL);
m_transform = hooks->m_cont;
while (hooks->m_link.next) {
xform = (INKVConnInternal *) hooks->m_cont;
hooks = hooks->m_link.next;
xform->do_io_transform(hooks->m_cont);
}
xform = (INKVConnInternal *) hooks->m_cont;
xform->do_io_transform(&m_terminus);
Debug("transform", "TransformVConnection create [0x%lx]", (long) this);
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
TransformVConnection::~TransformVConnection()
{
// Clear the continuations in terminus VConnections so that
// mutex's get released (INKqa05596)
m_terminus.m_read_vio.set_continuation(NULL);
m_terminus.m_write_vio.set_continuation(NULL);
m_terminus.mutex = NULL;
this->mutex = NULL;
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
int
TransformVConnection::handle_event(int event, void *edata)
{
NOWARN_UNUSED(event);
NOWARN_UNUSED(edata);
ink_assert(!"not reached");
return 0;
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
VIO *
TransformVConnection::do_io_read(Continuation *c, int64_t nbytes, MIOBuffer *buf)
{
Debug("transform", "TransformVConnection do_io_read: 0x%lx [0x%lx]", (long) c, (long) this);
return m_terminus.do_io_read(c, nbytes, buf);
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
VIO *
TransformVConnection::do_io_write(Continuation *c, int64_t nbytes, IOBufferReader *buf, bool owner)
{
NOWARN_UNUSED(owner);
Debug("transform", "TransformVConnection do_io_write: 0x%lx [0x%lx]", (long) c, (long) this);
return m_transform->do_io_write(c, nbytes, buf);
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
void
TransformVConnection::do_io_close(int error)
{
Debug("transform", "TransformVConnection do_io_close: %d [0x%lx]", error, (long) this);
if (error != -1) {
m_closed = TS_VC_CLOSE_ABORT;
} else {
m_closed = TS_VC_CLOSE_NORMAL;
}
m_transform->do_io_close(error);
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
void
TransformVConnection::do_io_shutdown(ShutdownHowTo_t howto)
{
ink_assert(howto == IO_SHUTDOWN_WRITE);
Debug("transform", "TransformVConnection do_io_shutdown: %d [0x%lx]", howto, (long) this);
m_transform->do_io_shutdown(howto);
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
void
TransformVConnection::reenable(VIO *vio)
{
NOWARN_UNUSED(vio);
ink_assert(!"not reached");
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
TransformControl::TransformControl()
:Continuation(new_ProxyMutex()), m_hooks(), m_tvc(NULL), m_read_buf(NULL), m_write_buf(NULL)
{
SET_HANDLER(&TransformControl::handle_event);
m_hooks.append(transformProcessor.null_transform(new_ProxyMutex()));
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
int
TransformControl::handle_event(int event, void *edata)
{
NOWARN_UNUSED(edata);
switch (event) {
case EVENT_IMMEDIATE:
{
char *s, *e;
ink_assert(m_tvc == NULL);
if (http_global_hooks && http_global_hooks->get(TS_HTTP_RESPONSE_TRANSFORM_HOOK)) {
m_tvc = transformProcessor.open(this, http_global_hooks->get(TS_HTTP_RESPONSE_TRANSFORM_HOOK));
} else {
m_tvc = transformProcessor.open(this, m_hooks.get());
}
ink_assert(m_tvc != NULL);
m_write_buf = new_MIOBuffer();
s = m_write_buf->end();
e = m_write_buf->buf_end();
memset(s, 'a', e - s);
m_write_buf->fill(e - s);
m_tvc->do_io_write(this, 4 * 1024, m_write_buf->alloc_reader());
break;
}
case TRANSFORM_READ_READY:
{
MIOBuffer *buf = new_empty_MIOBuffer();
m_read_buf = buf->alloc_reader();
m_tvc->do_io_read(this, INT64_MAX, buf);
break;
}
case VC_EVENT_READ_COMPLETE:
case VC_EVENT_EOS:
m_tvc->do_io_close();
free_MIOBuffer(m_read_buf->mbuf);
m_read_buf = NULL;
free_MIOBuffer(m_write_buf);
m_write_buf = NULL;
break;
case VC_EVENT_WRITE_COMPLETE:
break;
default:
ink_assert(!"not reached");
break;
}
return 0;
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
NullTransform::NullTransform(ProxyMutex *_mutex)
: INKVConnInternal(NULL, reinterpret_cast<TSMutex>(_mutex)),
m_output_buf(NULL), m_output_reader(NULL), m_output_vio(NULL)
{
SET_HANDLER(&NullTransform::handle_event);
Debug("transform", "NullTransform create [0x%lx]", (long) this);
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
NullTransform::~NullTransform()
{
if (m_output_buf) {
free_MIOBuffer(m_output_buf);
}
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
int
NullTransform::handle_event(int event, void *edata)
{
handle_event_count(event);
Debug("transform", "[NullTransform::handle_event] event count %d", m_event_count);
if (m_closed) {
if (m_deletable) {
Debug("transform", "NullTransform destroy: %d [0x%lx]", m_output_vio ? m_output_vio->ndone : 0, (long) this);
delete this;
}
} else {
switch (event) {
case VC_EVENT_ERROR:
m_write_vio._cont->handleEvent(VC_EVENT_ERROR, &m_write_vio);
break;
case VC_EVENT_WRITE_COMPLETE:
ink_assert(m_output_vio == (VIO *) edata);
// The write to the output vconnection completed. This
// could only be the case if the data being fed into us
// has also completed.
ink_assert(m_write_vio.ntodo() == 0);
m_output_vc->do_io_shutdown(IO_SHUTDOWN_WRITE);
break;
case VC_EVENT_WRITE_READY:
default:
{
int64_t towrite;
int64_t avail;
ink_assert(m_output_vc != NULL);
if (!m_output_vio) {
m_output_buf = new_empty_MIOBuffer();
m_output_reader = m_output_buf->alloc_reader();
m_output_vio = m_output_vc->do_io_write(this, m_write_vio.nbytes, m_output_reader);
}
MUTEX_TRY_LOCK(trylock, m_write_vio.mutex, this_ethread());
if (!trylock) {
retry(10);
return 0;
}
if (m_closed) {
return 0;
}
if (m_write_vio.op == VIO::NONE) {
m_output_vio->nbytes = m_write_vio.ndone;
m_output_vio->reenable();
return 0;
}
towrite = m_write_vio.ntodo();
if (towrite > 0) {
avail = m_write_vio.get_reader()->read_avail();
if (towrite > avail) {
towrite = avail;
}
if (towrite > 0) {
Debug("transform", "[NullTransform::handle_event] " "writing %d bytes to output", towrite);
m_output_buf->write(m_write_vio.get_reader(), towrite);
m_write_vio.get_reader()->consume(towrite);
m_write_vio.ndone += towrite;
}
}
if (m_write_vio.ntodo() > 0) {
if (towrite > 0) {
m_output_vio->reenable();
m_write_vio._cont->handleEvent(VC_EVENT_WRITE_READY, &m_write_vio);
}
} else {
m_output_vio->nbytes = m_write_vio.ndone;
m_output_vio->reenable();
m_write_vio._cont->handleEvent(VC_EVENT_WRITE_COMPLETE, &m_write_vio);
}
break;
}
}
}
return 0;
}
/*-------------------------------------------------------------------------
Reasons the JG transform cannot currently be a plugin:
a) Uses the config system
- Easily avoided by using the plugin.config file to pass the config
values as parameters to the plugin initialization routine.
b) Uses the stat system
- FIXME: should probably solve this.
-------------------------------------------------------------------------*/
/* the JG transform is now a plugin. All the JG code,
config variables and stats are removed from Transform.cc */
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
#ifdef TS_HAS_TESTS
void
TransformTest::run()
{
if (is_action_tag_set("transform_test")) {
eventProcessor.schedule_imm(NEW(new TransformControl()), ET_NET);
}
}
#endif
///////////////////////////////////////////////////////////////////
/// RangeTransform implementation
/// handling Range requests from clients
///////////////////////////////////////////////////////////////////
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
inline static int
num_chars_for_int(int64_t i)
{
int k = 1;
if (i < 0)
return 0;
while ((i /= 10) != 0)
++k;
return k;
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
RangeTransform::RangeTransform(ProxyMutex *mut, MIMEField *range_field, HTTPInfo *cache_obj, HTTPHdr *transform_resp)
: INKVConnInternal(NULL, reinterpret_cast<TSMutex>(mut)),
m_output_buf(NULL),
m_output_reader(NULL),
m_range_field(range_field),
m_transform_resp(transform_resp),
m_output_vio(NULL),
m_unsatisfiable_range(true),
m_not_handle_range(false),
m_num_range_fields(0),
m_current_range(0), m_content_type(NULL), m_content_type_len(0), m_ranges(NULL), m_output_cl(0), m_done(0)
{
SET_HANDLER(&RangeTransform::handle_event);
m_content_type = cache_obj->
response_get()->value_get(MIME_FIELD_CONTENT_TYPE, MIME_LEN_CONTENT_TYPE, &m_content_type_len);
m_content_length = cache_obj->object_size_get();
m_num_chars_for_cl = num_chars_for_int(m_content_length);
parse_range_and_compare();
calculate_output_cl();
Debug("transform_range", "RangeTransform creation finishes");
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
RangeTransform::~RangeTransform()
{
if (m_ranges)
delete[]m_ranges;
if (m_output_buf)
free_MIOBuffer(m_output_buf);
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
void
RangeTransform::parse_range_and_compare()
{
// note: unsatisfiable_range is initialized to true in constructor
int prev_good_range, i;
const char *value;
int value_len;
HdrCsvIter csv;
const char *s, *e;
if (m_content_length <= 0)
return;
ink_assert(m_range_field != NULL);
m_num_range_fields = 0;
value = csv.get_first(m_range_field, &value_len);
while (value) {
m_num_range_fields++;
value = csv.get_next(&value_len);
}
if (m_num_range_fields <= 0)
return;
m_ranges = NEW(new RangeRecord[m_num_range_fields]);
value = csv.get_first(m_range_field, &value_len);
i = 0;
prev_good_range = -1;
// Currently HTTP/1.1 only defines bytes Range
if (ptr_len_ncmp(value, value_len, "bytes=", 6) == 0) {
while (value) {
// If delimiter '-' is missing
if (!(e = (const char *) memchr(value, '-', value_len))) {
m_unsatisfiable_range = true;
return;
}
if ( memcmp(value,"bytes=",6) == 0 ) {
s = value + 6;
}
else {
s = value;
}
m_ranges[i]._start = ((s==e)?-1:mime_parse_int64(s, e));
e++;
s = e;
e = value + value_len;
if ( e && *(e-1) == '-') { //open-ended Range: bytes=10-\r\n\r\n should be supported
m_ranges[i]._end = -1;
}
else {
m_ranges[i]._end = mime_parse_int64(s, e);
}
// check and change if necessary whether this is a right entry
// the last _end bytes are required
if (m_ranges[i]._start == -1 && m_ranges[i]._end > 0) {
if (m_ranges[i]._end > m_content_length)
m_ranges[i]._end = m_content_length;
m_ranges[i]._start = m_content_length - m_ranges[i]._end;
m_ranges[i]._end = m_content_length - 1;
}
// open start
else if (m_ranges[i]._start >= 0 && m_ranges[i]._end == -1) {
if (m_ranges[i]._start >= m_content_length)
m_ranges[i]._start = -1;
else
m_ranges[i]._end = m_content_length - 1;
}
// "normal" Range - could be wrong if _end<_start
else if (m_ranges[i]._start >= 0 && m_ranges[i]._end >= 0) {
if (m_ranges[i]._start > m_ranges[i]._end || m_ranges[i]._start >= m_content_length)
m_ranges[i]._start = m_ranges[i]._end = -1;
else if (m_ranges[i]._end >= m_content_length)
m_ranges[i]._end = m_content_length - 1;
}
else
m_ranges[i]._start = m_ranges[i]._end = -1;
// this is a good Range entry
if (m_ranges[i]._start != -1) {
if (m_unsatisfiable_range) {
m_unsatisfiable_range = false;
// initialize m_current_range to the first good Range
m_current_range = i;
}
// currently we don't handle out-of-order Range entry
else if (prev_good_range >= 0 && m_ranges[i]._start <= m_ranges[prev_good_range]._end) {
m_not_handle_range = true;
break;
}
prev_good_range = i;
}
value = csv.get_next(&value_len);
i++;
}
}
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
int
RangeTransform::handle_event(int event, void *edata)
{
handle_event_count(event);
if (m_closed) {
if (m_deletable) {
Debug("transform_range", "RangeTransform destroy: %d", m_output_vio ? m_output_vio->ndone : 0);
delete this;
}
} else {
switch (event) {
case VC_EVENT_ERROR:
m_write_vio._cont->handleEvent(VC_EVENT_ERROR, &m_write_vio);
break;
case VC_EVENT_WRITE_COMPLETE:
ink_assert(m_output_vio == (VIO *) edata);
m_output_vc->do_io_shutdown(IO_SHUTDOWN_WRITE);
break;
case VC_EVENT_WRITE_READY:
default:
ink_assert(m_output_vc != NULL);
if (!m_output_vio) {
m_output_buf = new_empty_MIOBuffer();
m_output_reader = m_output_buf->alloc_reader();
m_output_vio = m_output_vc->do_io_write(this, m_output_cl, m_output_reader);
change_response_header();
if (m_num_range_fields > 1) {
add_boundary(false);
add_sub_header(m_current_range);
}
}
MUTEX_TRY_LOCK(trylock, m_write_vio.mutex, this_ethread());
if (!trylock) {
retry(10);
return 0;
}
if (m_closed) {
return 0;
}
if (m_write_vio.op == VIO::NONE) {
m_output_vio->nbytes = m_done;
m_output_vio->reenable();
return 0;
}
transform_to_range();
break;
}
}
return 0;
}
/*-------------------------------------------------------------------------
-------------------------------------------------------------------------*/
void
RangeTransform::transform_to_range()
{
IOBufferReader *reader = m_write_vio.get_reader();
int64_t toskip, tosend, avail;
const int64_t *end, *start;
int64_t prev_end = 0;
int64_t *done_byte;
end = &m_ranges[m_current_range]._end;
done_byte = &m_ranges[m_current_range]._done_byte;
start = &m_ranges[m_current_range]._start;
avail = reader->read_avail();
while (true) {
if (*done_byte < (*start - 1)) {
toskip = *start - *done_byte - 1;