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simgear/simgear/io/HTTPClient.cxx

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/**
* \file HTTPClient.cxx - simple HTTP client engine for SimHear
*/
// Written by James Turner
//
// Copyright (C) 2013 James Turner <zakalawe@mac.com>
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
#include "HTTPClient.hxx"
#include "HTTPFileRequest.hxx"
#include <sstream>
#include <cassert>
#include <cstdlib> // rand()
#include <list>
#include <errno.h>
#include <map>
#include <stdexcept>
#include <boost/foreach.hpp>
#include <boost/algorithm/string/case_conv.hpp>
#include <simgear/simgear_config.h>
#if defined(ENABLE_CURL)
#include <curl/multi.h>
#else
#include <simgear/io/HTTPContentDecode.hxx>
#endif
#include <simgear/io/sg_netChat.hxx>
#include <simgear/misc/strutils.hxx>
#include <simgear/compiler.h>
#include <simgear/debug/logstream.hxx>
#include <simgear/timing/timestamp.hxx>
#include <simgear/structure/exception.hxx>
#if defined( HAVE_VERSION_H ) && HAVE_VERSION_H
#include "version.h"
#else
# if !defined(SIMGEAR_VERSION)
# define SIMGEAR_VERSION "simgear-development"
# endif
#endif
namespace simgear
{
namespace HTTP
{
extern const int DEFAULT_HTTP_PORT = 80;
const char* CONTENT_TYPE_URL_ENCODED = "application/x-www-form-urlencoded";
const unsigned int MAX_INFLIGHT_REQUESTS = 32;
class Connection;
typedef std::multimap<std::string, Connection*> ConnectionDict;
typedef std::list<Request_ptr> RequestList;
class Client::ClientPrivate
{
public:
#if defined(ENABLE_CURL)
CURLM* curlMulti;
bool haveActiveRequests;
#else
NetChannelPoller poller;
// connections by host (potentially more than one)
ConnectionDict connections;
#endif
std::string userAgent;
std::string proxy;
int proxyPort;
std::string proxyAuth;
unsigned int maxConnections;
RequestList pendingRequests;
SGTimeStamp timeTransferSample;
unsigned int bytesTransferred;
unsigned int lastTransferRate;
uint64_t totalBytesDownloaded;
};
#if !defined(ENABLE_CURL)
class Connection : public NetChat
{
public:
Connection(Client* pr) :
client(pr),
state(STATE_CLOSED),
port(DEFAULT_HTTP_PORT)
{
}
virtual ~Connection()
{
}
virtual void handleBufferRead (NetBuffer& buffer)
{
if( !activeRequest || !activeRequest->isComplete() )
return NetChat::handleBufferRead(buffer);
// Request should be aborted (signaled by setting its state to complete).
// force the state to GETTING_BODY, to simplify logic in
// responseComplete and handleClose
state = STATE_GETTING_BODY;
responseComplete();
}
void setServer(const std::string& h, short p)
{
host = h;
port = p;
}
// socket-level errors
virtual void handleError(int error)
{
const char* errStr = strerror(error);
if (!activeRequest)
{
// connection level failure, eg name lookup or routing
// we won't have an active request yet, so let's fail all of the
// requests since we presume it's a systematic failure for
// the host in question
BOOST_FOREACH(Request_ptr req, sentRequests) {
req->setFailure(error, errStr);
}
BOOST_FOREACH(Request_ptr req, queuedRequests) {
req->setFailure(error, errStr);
}
sentRequests.clear();
queuedRequests.clear();
}
NetChat::handleError(error);
if (activeRequest) {
activeRequest->setFailure(error, errStr);
activeRequest = NULL;
_contentDecoder.reset();
}
state = STATE_SOCKET_ERROR;
}
virtual void handleClose()
{
NetChat::handleClose();
// closing of the connection from the server side when getting the body,
bool canCloseState = (state == STATE_GETTING_BODY);
if (canCloseState && activeRequest) {
// force state here, so responseComplete can avoid closing the
// socket again
state = STATE_CLOSED;
responseComplete();
} else {
if (activeRequest) {
activeRequest->setFailure(500, "server closed connection");
// remove the failed request from sentRequests, so it does
// not get restored
RequestList::iterator it = std::find(sentRequests.begin(),
sentRequests.end(), activeRequest);
if (it != sentRequests.end()) {
sentRequests.erase(it);
}
activeRequest = NULL;
_contentDecoder.reset();
}
state = STATE_CLOSED;
}
if (sentRequests.empty()) {
return;
}
// restore sent requests to the queue, so they will be re-sent
// when the connection opens again
queuedRequests.insert(queuedRequests.begin(),
sentRequests.begin(), sentRequests.end());
sentRequests.clear();
}
void handleTimeout()
{
NetChat::handleError(ETIMEDOUT);
if (activeRequest) {
SG_LOG(SG_IO, SG_DEBUG, "HTTP socket timeout");
activeRequest->setFailure(ETIMEDOUT, "socket timeout");
activeRequest = NULL;
_contentDecoder.reset();
}
state = STATE_SOCKET_ERROR;
}
void queueRequest(const Request_ptr& r)
{
queuedRequests.push_back(r);
tryStartNextRequest();
}
void beginResponse()
{
assert(!sentRequests.empty());
assert(state == STATE_WAITING_FOR_RESPONSE);
activeRequest = sentRequests.front();
try {
activeRequest->responseStart(buffer);
} catch (sg_exception& e) {
handleError(EIO);
return;
}
state = STATE_GETTING_HEADERS;
buffer.clear();
if (activeRequest->responseCode() == 204) {
noMessageBody = true;
} else if (activeRequest->method() == "HEAD") {
noMessageBody = true;
} else {
noMessageBody = false;
}
bodyTransferSize = -1;
chunkedTransfer = false;
_contentDecoder.reset();
}
void tryStartNextRequest()
{
while( !queuedRequests.empty()
&& queuedRequests.front()->isComplete() )
queuedRequests.pop_front();
if (queuedRequests.empty()) {
idleTime.stamp();
return;
}
if (sentRequests.size() > MAX_INFLIGHT_REQUESTS) {
return;
}
if (state == STATE_CLOSED) {
if (!connectToHost()) {
return;
}
setTerminator("\r\n");
state = STATE_IDLE;
}
Request_ptr r = queuedRequests.front();
r->requestStart();
std::stringstream headerData;
std::string path = r->path();
assert(!path.empty());
std::string query = r->query();
std::string bodyData;
if (!client->proxyHost().empty()) {
path = r->scheme() + "://" + r->host() + r->path();
}
if (r->bodyType() == CONTENT_TYPE_URL_ENCODED) {
headerData << r->method() << " " << path << " HTTP/1.1\r\n";
bodyData = query.substr(1); // URL-encode, drop the leading '?'
headerData << "Content-Type:" << CONTENT_TYPE_URL_ENCODED << "\r\n";
headerData << "Content-Length:" << bodyData.size() << "\r\n";
} else {
headerData << r->method() << " " << path << query << " HTTP/1.1\r\n";
if( r->hasBodyData() )
{
headerData << "Content-Length:" << r->bodyLength() << "\r\n";
headerData << "Content-Type:" << r->bodyType() << "\r\n";
}
}
headerData << "Host: " << r->hostAndPort() << "\r\n";
headerData << "User-Agent:" << client->userAgent() << "\r\n";
headerData << "Accept-Encoding: deflate, gzip\r\n";
if (!client->proxyAuth().empty()) {
headerData << "Proxy-Authorization: " << client->proxyAuth() << "\r\n";
}
BOOST_FOREACH(const StringMap::value_type& h, r->requestHeaders()) {
headerData << h.first << ": " << h.second << "\r\n";
}
headerData << "\r\n"; // final CRLF to terminate the headers
if (!bodyData.empty()) {
headerData << bodyData;
}
bool ok = push(headerData.str().c_str());
if (!ok) {
SG_LOG(SG_IO, SG_WARN, "HTTPClient: over-stuffed the socket");
// we've over-stuffed the socket, give up for now, let things
// drain down before trying to start any more requests.
return;
}
if( r->hasBodyData() )
for(size_t body_bytes_sent = 0; body_bytes_sent < r->bodyLength();)
{
char buf[4096];
size_t len = r->getBodyData(buf, body_bytes_sent, 4096);
if( len )
{
if( !bufferSend(buf, len) )
{
SG_LOG(SG_IO,
SG_WARN,
"overflow the HTTP::Connection output buffer");
state = STATE_SOCKET_ERROR;
return;
}
body_bytes_sent += len;
}
else
{
SG_LOG(SG_IO,
SG_WARN,
"HTTP asynchronous request body generation is unsupported");
break;
}
}
// SG_LOG(SG_IO, SG_INFO, "did start request:" << r->url() <<
// "\n\t @ " << reinterpret_cast<void*>(r.ptr()) <<
// "\n\t on connection " << this);
// successfully sent, remove from queue, and maybe send the next
queuedRequests.pop_front();
sentRequests.push_back(r);
state = STATE_WAITING_FOR_RESPONSE;
// pipelining, let's maybe send the next request right away
tryStartNextRequest();
}
virtual void collectIncomingData(const char* s, int n)
{
idleTime.stamp();
client->receivedBytes(static_cast<unsigned int>(n));
if( (state == STATE_GETTING_BODY)
|| (state == STATE_GETTING_CHUNKED_BYTES) )
_contentDecoder.receivedBytes(s, n);
else
buffer.append(s, n);
}
virtual void foundTerminator(void)
{
idleTime.stamp();
switch (state) {
case STATE_WAITING_FOR_RESPONSE:
beginResponse();
break;
case STATE_GETTING_HEADERS:
processHeader();
buffer.clear();
break;
case STATE_GETTING_BODY:
responseComplete();
break;
case STATE_GETTING_CHUNKED:
processChunkHeader();
break;
case STATE_GETTING_CHUNKED_BYTES:
setTerminator("\r\n");
state = STATE_GETTING_CHUNKED;
buffer.clear();
break;
case STATE_GETTING_TRAILER:
processTrailer();
buffer.clear();
break;
case STATE_IDLE:
SG_LOG(SG_IO, SG_WARN, "HTTP got data in IDLE state, bad server?");
default:
break;
}
}
bool hasIdleTimeout() const
{
if (state != STATE_IDLE) {
return false;
}
assert(sentRequests.empty());
return idleTime.elapsedMSec() > 1000 * 10; // ten seconds
}
bool hasErrorTimeout() const
{
if (state == STATE_IDLE) {
return false;
}
return idleTime.elapsedMSec() > (1000 * 30); // 30 seconds
}
bool hasError() const
{
return (state == STATE_SOCKET_ERROR);
}
bool shouldStartNext() const
{
return !queuedRequests.empty() && (sentRequests.size() < MAX_INFLIGHT_REQUESTS);
}
bool isActive() const
{
return !queuedRequests.empty() || !sentRequests.empty();
}
private:
bool connectToHost()
{
SG_LOG(SG_IO, SG_DEBUG, "HTTP connecting to " << host << ":" << port);
if (!open()) {
SG_LOG(SG_ALL, SG_WARN, "HTTP::Connection: connectToHost: open() failed");
return false;
}
if (connect(host.c_str(), port) != 0) {
return false;
}
return true;
}
void processHeader()
{
std::string h = strutils::simplify(buffer);
if (h.empty()) { // blank line terminates headers
headersComplete();
return;
}
int colonPos = buffer.find(':');
if (colonPos < 0) {
SG_LOG(SG_IO, SG_WARN, "malformed HTTP response header:" << h);
return;
}
std::string key = strutils::simplify(buffer.substr(0, colonPos));
std::string lkey = boost::to_lower_copy(key);
std::string value = strutils::strip(buffer.substr(colonPos + 1));
// only consider these if getting headers (as opposed to trailers
// of a chunked transfer)
if (state == STATE_GETTING_HEADERS) {
if (lkey == "content-length") {
int sz = strutils::to_int(value);
if (bodyTransferSize <= 0) {
bodyTransferSize = sz;
}
activeRequest->setResponseLength(sz);
} else if (lkey == "transfer-length") {
bodyTransferSize = strutils::to_int(value);
} else if (lkey == "transfer-encoding") {
processTransferEncoding(value);
} else if (lkey == "content-encoding") {
_contentDecoder.setEncoding(value);
}
}
activeRequest->responseHeader(lkey, value);
}
void processTransferEncoding(const std::string& te)
{
if (te == "chunked") {
chunkedTransfer = true;
} else {
SG_LOG(SG_IO, SG_WARN, "unsupported transfer encoding:" << te);
// failure
}
}
void processChunkHeader()
{
if (buffer.empty()) {
// blank line after chunk data
return;
}
int chunkSize = 0;
int semiPos = buffer.find(';');
if (semiPos >= 0) {
// extensions ignored for the moment
chunkSize = strutils::to_int(buffer.substr(0, semiPos), 16);
} else {
chunkSize = strutils::to_int(buffer, 16);
}
buffer.clear();
if (chunkSize == 0) { // trailer start
state = STATE_GETTING_TRAILER;
return;
}
state = STATE_GETTING_CHUNKED_BYTES;
setByteCount(chunkSize);
}
void processTrailer()
{
if (buffer.empty()) {
// end of trailers
responseComplete();
return;
}
// process as a normal header
processHeader();
}
void headersComplete()
{
activeRequest->responseHeadersComplete();
_contentDecoder.initWithRequest(activeRequest);
if (chunkedTransfer) {
state = STATE_GETTING_CHUNKED;
} else if (noMessageBody || (bodyTransferSize == 0)) {
// force the state to GETTING_BODY, to simplify logic in
// responseComplete and handleClose
state = STATE_GETTING_BODY;
responseComplete();
} else {
setByteCount(bodyTransferSize); // may be -1, that's fine
state = STATE_GETTING_BODY;
}
}
void responseComplete()
{
Request_ptr completedRequest = activeRequest;
_contentDecoder.finish();
assert(sentRequests.front() == activeRequest);
sentRequests.pop_front();
bool doClose = activeRequest->closeAfterComplete();
activeRequest = NULL;
if ((state == STATE_GETTING_BODY) || (state == STATE_GETTING_TRAILER)) {
if (doClose) {
// this will bring us into handleClose() above, which updates
// state to STATE_CLOSED
close();
// if we have additional requests waiting, try to start them now
tryStartNextRequest();
}
}
if (state != STATE_CLOSED) {
state = sentRequests.empty() ? STATE_IDLE : STATE_WAITING_FOR_RESPONSE;
}
// notify request after we change state, so this connection is idle
// if completion triggers other requests (which is likely)
// SG_LOG(SG_IO, SG_INFO, "*** responseComplete:" << activeRequest->url());
completedRequest->responseComplete();
client->requestFinished(this);
setTerminator("\r\n");
}
enum ConnectionState {
STATE_IDLE = 0,
STATE_WAITING_FOR_RESPONSE,
STATE_GETTING_HEADERS,
STATE_GETTING_BODY,
STATE_GETTING_CHUNKED,
STATE_GETTING_CHUNKED_BYTES,
STATE_GETTING_TRAILER,
STATE_SOCKET_ERROR,
STATE_CLOSED ///< connection should be closed now
};
Client* client;
Request_ptr activeRequest;
ConnectionState state;
std::string host;
short port;
std::string buffer;
int bodyTransferSize;
SGTimeStamp idleTime;
bool chunkedTransfer;
bool noMessageBody;
RequestList queuedRequests;
RequestList sentRequests;
ContentDecoder _contentDecoder;
};
#endif // of !ENABLE_CURL
Client::Client() :
d(new ClientPrivate)
{
d->proxyPort = 0;
d->maxConnections = 4;
d->bytesTransferred = 0;
d->lastTransferRate = 0;
d->timeTransferSample.stamp();
d->totalBytesDownloaded = 0;
setUserAgent("SimGear-" SG_STRINGIZE(SIMGEAR_VERSION));
#if defined(ENABLE_CURL)
static bool didInitCurlGlobal = false;
if (!didInitCurlGlobal) {
curl_global_init(CURL_GLOBAL_ALL);
didInitCurlGlobal = true;
}
d->curlMulti = curl_multi_init();
#endif
}
Client::~Client()
{
#if defined(ENABLE_CURL)
curl_multi_cleanup(d->curlMulti);
#endif
}
void Client::setMaxConnections(unsigned int maxCon)
{
if (maxCon < 1) {
throw sg_range_exception("illegal HTTP::Client::setMaxConnections value");
}
d->maxConnections = maxCon;
#if defined(ENABLE_CURL)
curl_multi_setopt(d->curlMulti, CURLMOPT_MAXCONNECTS, (long) maxCon);
#endif
}
void Client::update(int waitTimeout)
{
#if defined(ENABLE_CURL)
int remainingActive, messagesInQueue;
curl_multi_perform(d->curlMulti, &remainingActive);
d->haveActiveRequests = (remainingActive > 0);
CURLMsg* msg;
while ((msg = curl_multi_info_read(d->curlMulti, &messagesInQueue))) {
if (msg->msg == CURLMSG_DONE) {
Request* req;
CURL *e = msg->easy_handle;
curl_easy_getinfo(e, CURLINFO_PRIVATE, &req);
long responseCode;
curl_easy_getinfo(e, CURLINFO_RESPONSE_CODE, &responseCode);
if (msg->data.result == 0) {
req->responseComplete();
} else {
fprintf(stderr, "Result: %d - %s\n",
msg->data.result, curl_easy_strerror(msg->data.result));
req->setFailure(msg->data.result, curl_easy_strerror(msg->data.result));
}
curl_multi_remove_handle(d->curlMulti, e);
// balance the reference we take in makeRequest
SGReferenced::put(req);
curl_easy_cleanup(e);
}
else {
SG_LOG(SG_IO, SG_ALERT, "CurlMSG:" << msg->msg);
}
} // of curl message processing loop
#else
if (!d->poller.hasChannels() && (waitTimeout > 0)) {
SGTimeStamp::sleepForMSec(waitTimeout);
} else {
d->poller.poll(waitTimeout);
}
bool waitingRequests = !d->pendingRequests.empty();
ConnectionDict::iterator it = d->connections.begin();
for (; it != d->connections.end(); ) {
Connection* con = it->second;
if (con->hasIdleTimeout() ||
con->hasError() ||
con->hasErrorTimeout() ||
(!con->isActive() && waitingRequests))
{
if (con->hasErrorTimeout()) {
// tell the connection we're timing it out
con->handleTimeout();
}
// connection has been idle for a while, clean it up
// (or if we have requests waiting for a different host,
// or an error condition
ConnectionDict::iterator del = it++;
delete del->second;
d->connections.erase(del);
} else {
if (it->second->shouldStartNext()) {
it->second->tryStartNextRequest();
}
++it;
}
} // of connection iteration
if (waitingRequests && (d->connections.size() < d->maxConnections)) {
RequestList waiting(d->pendingRequests);
d->pendingRequests.clear();
// re-submit all waiting requests in order; this takes care of
// finding multiple pending items targetted to the same (new)
// connection
BOOST_FOREACH(Request_ptr req, waiting) {
makeRequest(req);
}
}
#endif
}
void Client::makeRequest(const Request_ptr& r)
{
if( r->isComplete() )
return;
if( r->url().find("://") == std::string::npos ) {
r->setFailure(EINVAL, "malformed URL");
return;
}
#if defined(ENABLE_CURL)
CURL* curlRequest = curl_easy_init();
curl_easy_setopt(curlRequest, CURLOPT_URL, r->url().c_str());
// manually increase the ref count of the request
SGReferenced::get(r.get());
curl_easy_setopt(curlRequest, CURLOPT_PRIVATE, r.get());
// disable built-in libCurl progress feedback
curl_easy_setopt(curlRequest, CURLOPT_NOPROGRESS, 1);
curl_easy_setopt(curlRequest, CURLOPT_WRITEFUNCTION, requestWriteCallback);
curl_easy_setopt(curlRequest, CURLOPT_WRITEDATA, r.get());
curl_easy_setopt(curlRequest, CURLOPT_HEADERFUNCTION, requestHeaderCallback);
curl_easy_setopt(curlRequest, CURLOPT_HEADERDATA, r.get());
curl_easy_setopt(curlRequest, CURLOPT_USERAGENT, d->userAgent.c_str());
if (!d->proxy.empty()) {
curl_easy_setopt(curlRequest, CURLOPT_PROXY, d->proxy.c_str());
curl_easy_setopt(curlRequest, CURLOPT_PROXYPORT, d->proxyPort);
if (!d->proxyAuth.empty()) {
curl_easy_setopt(curlRequest, CURLOPT_PROXYAUTH, CURLAUTH_BASIC);
curl_easy_setopt(curlRequest, CURLOPT_PROXYUSERPWD, d->proxyAuth.c_str());
}
}
std::string method = boost::to_lower_copy(r->method());
if (method == "get") {
curl_easy_setopt(curlRequest, CURLOPT_HTTPGET, 1);
} else if (method == "put") {
curl_easy_setopt(curlRequest, CURLOPT_PUT, 1);
curl_easy_setopt(curlRequest, CURLOPT_UPLOAD, 1);
} else if (method == "post") {
// see http://curl.haxx.se/libcurl/c/CURLOPT_POST.html
curl_easy_setopt(curlRequest, CURLOPT_HTTPPOST, 1);
std::string q = r->query().substr(1);
curl_easy_setopt(curlRequest, CURLOPT_COPYPOSTFIELDS, q.c_str());
// reset URL to exclude query pieces
std::string urlWithoutQuery = r->url();
std::string::size_type queryPos = urlWithoutQuery.find('?');
urlWithoutQuery.resize(queryPos);
curl_easy_setopt(curlRequest, CURLOPT_URL, urlWithoutQuery.c_str());
} else {
curl_easy_setopt(curlRequest, CURLOPT_CUSTOMREQUEST, r->method().c_str());
}
struct curl_slist* headerList = NULL;
if (r->hasBodyData() && (method != "post")) {
curl_easy_setopt(curlRequest, CURLOPT_UPLOAD, 1);
curl_easy_setopt(curlRequest, CURLOPT_INFILESIZE, r->bodyLength());
curl_easy_setopt(curlRequest, CURLOPT_READFUNCTION, requestReadCallback);
curl_easy_setopt(curlRequest, CURLOPT_READDATA, r.get());
std::string h = "Content-Type:" + r->bodyType();
headerList = curl_slist_append(headerList, h.c_str());
}
StringMap::const_iterator it;
for (it = r->requestHeaders().begin(); it != r->requestHeaders().end(); ++it) {
std::string h = it->first + ": " + it->second;
headerList = curl_slist_append(headerList, h.c_str());
}
if (headerList != NULL) {
curl_easy_setopt(curlRequest, CURLOPT_HTTPHEADER, headerList);
}
curl_multi_add_handle(d->curlMulti, curlRequest);
d->haveActiveRequests = true;
// FIXME - premature?
r->requestStart();
#else
if( r->url().find("http://") != 0 ) {
r->setFailure(EINVAL, "only HTTP protocol is supported");
return;
}
std::string host = r->host();
int port = r->port();
if (!d->proxy.empty()) {
host = d->proxy;
port = d->proxyPort;
}
Connection* con = NULL;
std::stringstream ss;
ss << host << "-" << port;
std::string connectionId = ss.str();
bool havePending = !d->pendingRequests.empty();
bool atConnectionsLimit = d->connections.size() >= d->maxConnections;
ConnectionDict::iterator consEnd = d->connections.end();
// assign request to an existing Connection.
// various options exist here, examined in order
ConnectionDict::iterator it = d->connections.find(connectionId);
if (atConnectionsLimit && (it == consEnd)) {
// maximum number of connections active, queue this request
// when a connection goes inactive, we'll start this one
d->pendingRequests.push_back(r);
return;
}
// scan for an idle Connection to the same host (likely if we're
// retrieving multiple resources from the same host in quick succession)
// if we have pending requests (waiting for a free Connection), then
// force new requests on this id to always use the first Connection
// (instead of the random selection below). This ensures that when
// there's pressure on the number of connections to keep alive, one
// host can't DoS every other.
int count = 0;
for (; (it != consEnd) && (it->first == connectionId); ++it, ++count) {
if (havePending || !it->second->isActive()) {
con = it->second;
break;
}
}
if (!con && atConnectionsLimit) {
// all current connections are busy (active), and we don't
// have free connections to allocate, so let's assign to
// an existing one randomly. Ideally we'd used whichever one will
// complete first but we don't have that info.
int index = rand() % count;
for (it = d->connections.find(connectionId); index > 0; --index) { ; }
con = it->second;
}
// allocate a new connection object
if (!con) {
con = new Connection(this);
con->setServer(host, port);
d->poller.addChannel(con);
d->connections.insert(d->connections.end(),
ConnectionDict::value_type(connectionId, con));
}
con->queueRequest(r);
#endif
}
//------------------------------------------------------------------------------
FileRequestRef Client::save( const std::string& url,
const std::string& filename )
{
FileRequestRef req = new FileRequest(url, filename);
makeRequest(req);
return req;
}
//------------------------------------------------------------------------------
MemoryRequestRef Client::load(const std::string& url)
{
MemoryRequestRef req = new MemoryRequest(url);
makeRequest(req);
return req;
}
void Client::requestFinished(Connection* con)
{
}
void Client::setUserAgent(const std::string& ua)
{
d->userAgent = ua;
}
const std::string& Client::userAgent() const
{
return d->userAgent;
}
const std::string& Client::proxyHost() const
{
return d->proxy;
}
const std::string& Client::proxyAuth() const
{
return d->proxyAuth;
}
void Client::setProxy( const std::string& proxy,
int port,
const std::string& auth )
{
d->proxy = proxy;
d->proxyPort = port;
d->proxyAuth = auth;
}
bool Client::hasActiveRequests() const
{
#if defined(ENABLE_CURL)
return d->haveActiveRequests;
#else
ConnectionDict::const_iterator it = d->connections.begin();
for (; it != d->connections.end(); ++it) {
if (it->second->isActive()) return true;
}
return false;
#endif
}
void Client::receivedBytes(unsigned int count)
{
d->bytesTransferred += count;
d->totalBytesDownloaded += count;
}
unsigned int Client::transferRateBytesPerSec() const
{
unsigned int e = d->timeTransferSample.elapsedMSec();
if (e > 400) {
// too long a window, ignore
d->timeTransferSample.stamp();
d->bytesTransferred = 0;
d->lastTransferRate = 0;
return 0;
}
if (e < 100) { // avoid really narrow windows
return d->lastTransferRate;
}
unsigned int ratio = (d->bytesTransferred * 1000) / e;
// run a low-pass filter
unsigned int smoothed = ((400 - e) * d->lastTransferRate) + (e * ratio);
smoothed /= 400;
d->timeTransferSample.stamp();
d->bytesTransferred = 0;
d->lastTransferRate = smoothed;
return smoothed;
}
uint64_t Client::totalBytesDownloaded() const
{
return d->totalBytesDownloaded;
}
size_t Client::requestWriteCallback(char *ptr, size_t size, size_t nmemb, void *userdata)
{
size_t byteSize = size * nmemb;
Request* req = static_cast<Request*>(userdata);
req->processBodyBytes(ptr, byteSize);
return byteSize;
}
size_t Client::requestReadCallback(char *ptr, size_t size, size_t nmemb, void *userdata)
{
size_t maxBytes = size * nmemb;
Request* req = static_cast<Request*>(userdata);
size_t actualBytes = req->getBodyData(ptr, 0, maxBytes);
return actualBytes;
}
size_t Client::requestHeaderCallback(char *rawBuffer, size_t size, size_t nitems, void *userdata)
{
size_t byteSize = size * nitems;
Request* req = static_cast<Request*>(userdata);
std::string h = strutils::simplify(std::string(rawBuffer, byteSize));
if (req->readyState() == HTTP::Request::OPENED) {
req->responseStart(h);
return byteSize;
}
if (h.empty()) {
// got a 100-continue reponse; restart
if (req->responseCode() == 100) {
req->setReadyState(HTTP::Request::OPENED);
return byteSize;
}
req->responseHeadersComplete();
return byteSize;
}
if (req->responseCode() == 100) {
return byteSize; // skip headers associated with 100-continue status
}
size_t colonPos = h.find(':');
if (colonPos == std::string::npos) {
SG_LOG(SG_IO, SG_WARN, "malformed HTTP response header:" << h);
return byteSize;
}
std::string key = strutils::simplify(h.substr(0, colonPos));
std::string lkey = boost::to_lower_copy(key);
std::string value = strutils::strip(h.substr(colonPos + 1));
req->responseHeader(lkey, value);
return byteSize;
}
} // of namespace HTTP
} // of namespace simgear
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