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XrdTpcMultistream.cc
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XrdTpcMultistream.cc
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/**
* Implementation of multi-stream HTTP transfers for the TPCHandler
*/
#ifdef XRD_CHUNK_RESP
#include "XrdTpcTPC.hh"
#include "XrdTpcState.hh"
#include "XrdTpcCurlMulti.hh"
#include "XrdSys/XrdSysError.hh"
#include <curl/curl.h>
#include <sstream>
#include <stdexcept>
using namespace TPC;
class CurlHandlerSetupError : public std::runtime_error {
public:
CurlHandlerSetupError(const std::string &msg) :
std::runtime_error(msg)
{}
virtual ~CurlHandlerSetupError() throw () {}
};
namespace {
class MultiCurlHandler {
public:
MultiCurlHandler(std::vector<State*> &states, XrdSysError &log) :
m_handle(curl_multi_init()),
m_states(states),
m_log(log)
{
if (m_handle == NULL) {
throw CurlHandlerSetupError("Failed to initialize a libcurl multi-handle");
}
m_avail_handles.reserve(states.size());
m_active_handles.reserve(states.size());
for (std::vector<State*>::const_iterator state_iter = states.begin();
state_iter != states.end();
state_iter++) {
m_avail_handles.push_back((*state_iter)->GetHandle());
}
}
~MultiCurlHandler()
{
if (!m_handle) {return;}
for (std::vector<CURL *>::const_iterator it = m_active_handles.begin();
it != m_active_handles.end();
it++) {
curl_multi_remove_handle(m_handle, *it);
curl_easy_cleanup(*it);
}
for (std::vector<CURL *>::const_iterator it = m_avail_handles.begin();
it != m_avail_handles.end();
it++) {
curl_easy_cleanup(*it);
}
curl_multi_cleanup(m_handle);
}
MultiCurlHandler(const MultiCurlHandler &) = delete;
CURLM *Get() const {return m_handle;}
void FinishCurlXfer(CURL *curl) {
CURLMcode mres = curl_multi_remove_handle(m_handle, curl);
if (mres) {
std::stringstream ss;
ss << "Failed to remove transfer from set: "
<< curl_multi_strerror(mres);
throw std::runtime_error(ss.str());
}
for (std::vector<State*>::iterator state_iter = m_states.begin();
state_iter != m_states.end();
state_iter++) {
if (curl == (*state_iter)->GetHandle()) {
(*state_iter)->ResetAfterRequest();
break;
}
}
for (std::vector<CURL *>::iterator iter = m_active_handles.begin();
iter != m_active_handles.end();
++iter)
{
if (*iter == curl) {
m_active_handles.erase(iter);
break;
}
}
m_avail_handles.push_back(curl);
}
off_t StartTransfers(off_t current_offset, off_t content_length, size_t block_size,
int &running_handles) {
bool started_new_xfer = false;
do {
size_t xfer_size = std::min(content_length - current_offset, static_cast<off_t>(block_size));
if (xfer_size == 0) {return current_offset;}
if (!(started_new_xfer = StartTransfer(current_offset, xfer_size))) {
// In this case, we need to start new transfers but weren't able to.
if (running_handles == 0) {
if (!CanStartTransfer(true)) {
m_log.Emsg("StartTransfers", "Unable to start transfers.");
}
}
break;
} else {
running_handles += 1;
}
current_offset += xfer_size;
} while (true);
return current_offset;
}
private:
bool StartTransfer(off_t offset, size_t size) {
if (!CanStartTransfer(false)) {return false;}
for (std::vector<CURL*>::const_iterator handle_it = m_avail_handles.begin();
handle_it != m_avail_handles.end();
handle_it++) {
for (std::vector<State*>::iterator state_it = m_states.begin();
state_it != m_states.end();
state_it++) {
if ((*state_it)->GetHandle() == *handle_it) { // This state object represents an idle handle.
(*state_it)->SetTransferParameters(offset, size);
ActivateHandle(**state_it);
return true;
}
}
}
return false;
}
void ActivateHandle(State &state) {
CURL *curl = state.GetHandle();
m_active_handles.push_back(curl);
CURLMcode mres;
mres = curl_multi_add_handle(m_handle, curl);
if (mres) {
std::stringstream ss;
ss << "Failed to add transfer to libcurl multi-handle"
<< curl_multi_strerror(mres);
throw std::runtime_error(ss.str());
}
for (auto iter = m_avail_handles.begin();
iter != m_avail_handles.end();
++iter)
{
if (*iter == curl) {
m_avail_handles.erase(iter);
break;
}
}
}
bool CanStartTransfer(bool log_reason) const {
size_t idle_handles = m_avail_handles.size();
size_t transfer_in_progress = 0;
for (std::vector<State*>::const_iterator state_iter = m_states.begin();
state_iter != m_states.end();
state_iter++) {
for (std::vector<CURL*>::const_iterator handle_iter = m_active_handles.begin();
handle_iter != m_active_handles.end();
handle_iter++) {
if (*handle_iter == (*state_iter)->GetHandle()) {
transfer_in_progress += (*state_iter)->BodyTransferInProgress();
break;
}
}
}
if (!idle_handles) {
if (log_reason) {
m_log.Emsg("CanStartTransfer", "Unable to start transfers as no idle CURL handles are available.");
}
return false;
}
ssize_t available_buffers = m_states[0]->AvailableBuffers();
// To be conservative, set aside buffers for any transfers that have been activated
// but don't have their first responses back yet.
available_buffers -= (m_active_handles.size() - transfer_in_progress);
if (log_reason && (available_buffers == 0)) {
std::stringstream ss;
ss << "Unable to start transfers as no buffers are available. Available buffers: " <<
m_states[0]->AvailableBuffers() << ", Active curl handles: " << m_active_handles.size()
<< ", Transfers in progress: " << transfer_in_progress;
m_log.Emsg("CanStartTransfer", ss.str().c_str());
if (m_states[0]->AvailableBuffers() == 0) {
m_states[0]->DumpBuffers();
}
}
return available_buffers > 0;
}
CURLM *m_handle;
std::vector<CURL *> m_avail_handles;
std::vector<CURL *> m_active_handles;
std::vector<State*> &m_states;
XrdSysError &m_log;
};
}
int TPCHandler::RunCurlWithStreamsImpl(XrdHttpExtReq &req, State &state,
const char *log_prefix, size_t streams,
std::vector<State*> handles)
{
int result;
bool success;
CURL *curl = state.GetHandle();
if ((result = DetermineXferSize(curl, req, state, success)) || !success) {
return result;
}
off_t content_size = state.GetContentLength();
off_t current_offset = 0;
{
std::stringstream ss;
ss << "Successfully determined remote size for pull request: " << content_size;
m_log.Emsg("ProcessPullReq", ss.str().c_str());
}
state.ResetAfterRequest();
size_t concurrency = streams * m_pipelining_multiplier;
handles.reserve(concurrency);
handles.push_back(new State());
handles[0]->Move(state);
for (size_t idx = 1; idx < concurrency; idx++) {
handles.push_back(handles[0]->Duplicate());
}
// Create the multi-handle and add in the current transfer to it.
MultiCurlHandler mch(handles, m_log);
CURLM *multi_handle = mch.Get();
#ifdef USE_PIPELINING
curl_multi_setopt(multi_handle, CURLMOPT_PIPELINING, 1);
curl_multi_setopt(multi_handle, CURLMOPT_MAX_HOST_CONNECTIONS, streams);
#endif
// Start response to client prior to the first call to curl_multi_perform
int retval = req.StartChunkedResp(201, "Created", "Content-Type: text/plain");
if (retval) {
return retval;
}
// Start assigning transfers
int running_handles = 0;
current_offset = mch.StartTransfers(current_offset, content_size, m_block_size, running_handles);
// Transfer loop: use curl to actually run the transfer, but periodically
// interrupt things to send back performance updates to the client.
time_t last_marker = 0;
CURLcode res = static_cast<CURLcode>(-1);
CURLMcode mres;
do {
time_t now = time(NULL);
time_t next_marker = last_marker + m_marker_period;
if (now >= next_marker) {
if (SendPerfMarker(req, current_offset)) {
return -1;
}
last_marker = now;
}
mres = curl_multi_perform(multi_handle, &running_handles);
if (mres == CURLM_CALL_MULTI_PERFORM) {
// curl_multi_perform should be called again immediately. On newer
// versions of curl, this is no longer used.
continue;
} else if (mres != CURLM_OK) {
break;
}
// Harvest any messages, looking for CURLMSG_DONE.
CURLMsg *msg;
do {
int msgq = 0;
msg = curl_multi_info_read(multi_handle, &msgq);
if (msg && (msg->msg == CURLMSG_DONE)) {
CURL *easy_handle = msg->easy_handle;
mch.FinishCurlXfer(easy_handle);
res = msg->data.result;
// If any requests fail, cut off the entire transfer.
if (res != CURLE_OK) {
break;
}
}
} while (msg);
if (res != static_cast<CURLcode>(-1) && res != CURLE_OK) {
m_log.Emsg(log_prefix, "Breaking loop due to failed curl transfer.");
break;
}
if (running_handles < static_cast<int>(concurrency)) {
// Issue new transfers if there is still pending work to do.
// Otherwise, continue running until there are no handles left.
if (current_offset != content_size) {
current_offset = mch.StartTransfers(current_offset, content_size,
m_block_size, running_handles);
if (!running_handles) {
std::stringstream ss;
ss << "No handles are able to run. Streams=" << streams << ", concurrency="
<< concurrency;
m_log.Emsg(log_prefix, ss.str().c_str());
}
} else if (running_handles == 0) {
m_log.Emsg(log_prefix, "Unable to start new transfers; breaking loop.");
break;
}
}
int64_t max_sleep_time = next_marker - time(NULL);
if (max_sleep_time <= 0) {
continue;
}
int fd_count;
#ifdef HAVE_CURL_MULTI_WAIT
mres = curl_multi_wait(multi_handle, NULL, 0, max_sleep_time*1000,
&fd_count);
#else
mres = curl_multi_wait_impl(multi_handle, max_sleep_time*1000,
&fd_count);
#endif
if (mres != CURLM_OK) {
m_log.Emsg(log_prefix, "Breaking transfer due to failed curl multi wait.");
break;
}
} while (running_handles);
if (mres != CURLM_OK) {
std::stringstream ss;
ss << "Internal libcurl multi-handle error: "
<< curl_multi_strerror(mres);
throw std::runtime_error(ss.str());
}
// Harvest any messages, looking for CURLMSG_DONE.
CURLMsg *msg;
do {
int msgq = 0;
msg = curl_multi_info_read(multi_handle, &msgq);
if (msg && (msg->msg == CURLMSG_DONE)) {
CURL *easy_handle = msg->easy_handle;
mch.FinishCurlXfer(easy_handle);
if (res == CURLE_OK || res == static_cast<CURLcode>(-1))
res = msg->data.result; // Transfer result will be examined below.
}
} while (msg);
if (res == static_cast<CURLcode>(-1)) { // No transfers returned?!?
throw std::runtime_error("Internal state error in libcurl");
}
// Generate the final response back to the client.
std::stringstream ss;
if (res != CURLE_OK) {
m_log.Emsg(log_prefix, "request failed when processing", curl_easy_strerror(res));
ss << "failure: " << curl_easy_strerror(res);
} else if (current_offset != content_size) {
ss << "failure: Internal logic error led to early abort; current offset is " <<
current_offset << " while full size is " << content_size;
m_log.Emsg(log_prefix, ss.str().c_str());
} else if (state.GetStatusCode() >= 400) {
ss << "failure: Remote side failed with status code " << state.GetStatusCode();
m_log.Emsg(log_prefix, "Remote server failed request", ss.str().c_str());
} else {
ss << "success: Created";
}
if ((retval = req.ChunkResp(ss.str().c_str(), 0))) {
return retval;
}
return req.ChunkResp(NULL, 0);
}
int TPCHandler::RunCurlWithStreams(XrdHttpExtReq &req, State &state,
const char *log_prefix, size_t streams)
{
std::vector<State*> handles;
try {
int retval = RunCurlWithStreamsImpl(req, state, log_prefix, streams, handles);
for (std::vector<State*>::iterator state_iter = handles.begin();
state_iter != handles.end();
state_iter++) {
delete *state_iter;
}
return retval;
} catch (CurlHandlerSetupError &e) {
for (std::vector<State*>::iterator state_iter = handles.begin();
state_iter != handles.end();
state_iter++) {
delete *state_iter;
}
m_log.Emsg(log_prefix, e.what());
return req.SendSimpleResp(500, NULL, NULL, e.what(), 0);
} catch (std::runtime_error &e) {
for (std::vector<State*>::iterator state_iter = handles.begin();
state_iter != handles.end();
state_iter++) {
delete *state_iter;
}
m_log.Emsg(log_prefix, e.what());
std::stringstream ss;
ss << "failure: " << e.what();
int retval;
if ((retval = req.ChunkResp(ss.str().c_str(), 0))) {
return retval;
}
return req.ChunkResp(NULL, 0);
}
}
#endif // XRD_CHUNK_RESP