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ofURLFileLoader.cpp
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/
ofURLFileLoader.cpp
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#include "ofURLFileLoader.h"
#include "ofAppRunner.h"
#include "ofUtils.h"
#include "ofConstants.h"
using namespace std;
#if !defined(TARGET_IMPLEMENTS_URL_LOADER)
#include <curl/curl.h>
#include "ofThreadChannel.h"
#include "ofThread.h"
static bool curlInited = false;
#endif
int ofHttpRequest::nextID = 0;
ofEvent<ofHttpResponse> & ofURLResponseEvent(){
static ofEvent<ofHttpResponse> * event = new ofEvent<ofHttpResponse>;
return *event;
}
#if !defined(TARGET_IMPLEMENTS_URL_LOADER)
class ofURLFileLoaderImpl: public ofThread, public ofBaseURLFileLoader{
public:
ofURLFileLoaderImpl();
~ofURLFileLoaderImpl();
ofHttpResponse get(const string& url);
int getAsync(const string& url, const string& name=""); // returns id
ofHttpResponse saveTo(const string& url, const std::filesystem::path& path);
int saveAsync(const string& url, const std::filesystem::path& path);
void remove(int id);
void clear();
void stop();
ofHttpResponse handleRequest(const ofHttpRequest & request);
int handleRequestAsync(const ofHttpRequest& request); // returns id
protected:
// threading -----------------------------------------------
void threadedFunction();
void start();
void update(ofEventArgs & args); // notify in update so the notification is thread safe
private:
// perform the requests on the thread
ofThreadChannel<ofHttpRequest> requests;
ofThreadChannel<ofHttpResponse> responses;
ofThreadChannel<int> cancelRequestQueue;
set<int> cancelledRequests;
};
ofURLFileLoaderImpl::ofURLFileLoaderImpl() {
if(!curlInited){
curl_global_init(CURL_GLOBAL_ALL);
}
}
ofURLFileLoaderImpl::~ofURLFileLoaderImpl(){
clear();
stop();
}
ofHttpResponse ofURLFileLoaderImpl::get(const string& url) {
ofHttpRequest request(url,url);
return handleRequest(request);
}
int ofURLFileLoaderImpl::getAsync(const string& url, const string& name){
ofHttpRequest request(url, name.empty() ? url : name);
requests.send(request);
start();
return request.getId();
}
ofHttpResponse ofURLFileLoaderImpl::saveTo(const string& url, const std::filesystem::path& path){
ofHttpRequest request(url,path.string(),true);
return handleRequest(request);
}
int ofURLFileLoaderImpl::saveAsync(const string& url, const std::filesystem::path& path){
ofHttpRequest request(url,path.string(),true);
requests.send(request);
start();
return request.getId();
}
void ofURLFileLoaderImpl::remove(int id){
cancelRequestQueue.send(id);
}
void ofURLFileLoaderImpl::clear(){
ofHttpResponse resp;
ofHttpRequest req;
while(requests.tryReceive(req)){}
while(responses.tryReceive(resp)){}
}
void ofURLFileLoaderImpl::start() {
if (!isThreadRunning()){
ofAddListener(ofEvents().update,this,&ofURLFileLoaderImpl::update);
startThread();
}
}
void ofURLFileLoaderImpl::stop() {
stopThread();
requests.close();
responses.close();
waitForThread();
}
void ofURLFileLoaderImpl::threadedFunction() {
setThreadName("ofURLFileLoader " + ofToString(getThreadId()));
while( isThreadRunning() ){
int cancelled;
while(cancelRequestQueue.tryReceive(cancelled)){
cancelledRequests.insert(cancelled);
}
ofHttpRequest request;
if(requests.receive(request)){
if(cancelledRequests.find(request.getId())==cancelledRequests.end()){
ofHttpResponse response(handleRequest(request));
int status = response.status;
if(!responses.send(move(response))){
break;
}
if(status==-1){
// retry
requests.send(request);
}
}else{
cancelledRequests.erase(cancelled);
}
}else{
break;
}
}
}
namespace{
size_t saveToFile_cb(void *buffer, size_t size, size_t nmemb, void *userdata){
auto saveTo = (ofFile*)userdata;
saveTo->write((const char*)buffer, size * nmemb);
return size * nmemb;
}
size_t saveToMemory_cb(void *buffer, size_t size, size_t nmemb, void *userdata){
auto response = (ofHttpResponse*)userdata;
response->data.append((const char*)buffer, size * nmemb);
return size * nmemb;
}
size_t readBody_cb(void *ptr, size_t size, size_t nmemb, void *userdata){
auto body = (std::string*)userdata;
if(size*nmemb < 1){
return 0;
}
if(!body->empty()) {
auto sent = std::min(size * nmemb, body->size());
memcpy(ptr, body->c_str(), sent);
*body = body->substr(sent);
return sent;
}
return 0; /* no more data left to deliver */
}
}
ofHttpResponse ofURLFileLoaderImpl::handleRequest(const ofHttpRequest & request) {
std::unique_ptr<CURL, void(*)(CURL*)> curl =
std::unique_ptr<CURL, void(*)(CURL*)>(curl_easy_init(), curl_easy_cleanup);
curl_slist *headers = nullptr;
curl_easy_setopt(curl.get(), CURLOPT_SSL_VERIFYPEER, 0);
curl_easy_setopt(curl.get(), CURLOPT_SSL_VERIFYHOST, 0);
curl_easy_setopt(curl.get(), CURLOPT_URL, request.url.c_str());
// always follow redirections
curl_easy_setopt(curl.get(), CURLOPT_FOLLOWLOCATION, 1L);
// Set content type and any other header
if(request.contentType!=""){
headers = curl_slist_append(headers, ("Content-Type: " + request.contentType).c_str());
}
for(map<string,string>::const_iterator it = request.headers.cbegin(); it!=request.headers.cend(); it++){
headers = curl_slist_append(headers, (it->first + ": " +it->second).c_str());
}
curl_easy_setopt(curl.get(), CURLOPT_HTTPHEADER, headers);
std::string body = request.body;
// set body if there's any
if(request.body!=""){
// curl_easy_setopt(curl.get(), CURLOPT_UPLOAD, 1L); // Tis does PUT instead of POST
curl_easy_setopt(curl.get(), CURLOPT_POSTFIELDSIZE, request.body.size());
curl_easy_setopt(curl.get(), CURLOPT_POSTFIELDS, nullptr);
//curl_easy_setopt(curl.get(), CURLOPT_POSTFIELDS, request.body.c_str());
curl_easy_setopt(curl.get(), CURLOPT_READFUNCTION, readBody_cb);
curl_easy_setopt(curl.get(), CURLOPT_READDATA, &body);
}else{
// curl_easy_setopt(curl.get(), CURLOPT_UPLOAD, 0L);
curl_easy_setopt(curl.get(), CURLOPT_POSTFIELDSIZE, 0);
//curl_easy_setopt(curl.get(), CURLOPT_POSTFIELDS, nullptr);
curl_easy_setopt(curl.get(), CURLOPT_READFUNCTION, nullptr);
curl_easy_setopt(curl.get(), CURLOPT_READDATA, nullptr);
}
if(request.method == ofHttpRequest::GET){
curl_easy_setopt(curl.get(), CURLOPT_HTTPGET, 1);
curl_easy_setopt(curl.get(), CURLOPT_POST, 0);
}else{
curl_easy_setopt(curl.get(), CURLOPT_POST, 1);
curl_easy_setopt(curl.get(), CURLOPT_HTTPGET, 0);
}
if(request.timeoutSeconds>0){
curl_easy_setopt(curl.get(), CURLOPT_TIMEOUT, request.timeoutSeconds);
}
// start request and receive response
ofHttpResponse response(request, 0, "");
CURLcode err = CURLE_OK;
if(request.saveTo){
ofFile saveTo(request.name, ofFile::WriteOnly, true);
curl_easy_setopt(curl.get(), CURLOPT_WRITEDATA, &saveTo);
curl_easy_setopt(curl.get(), CURLOPT_WRITEFUNCTION, saveToFile_cb);
err = curl_easy_perform(curl.get());
}else{
curl_easy_setopt(curl.get(), CURLOPT_WRITEDATA, &response);
curl_easy_setopt(curl.get(), CURLOPT_WRITEFUNCTION, saveToMemory_cb);
err = curl_easy_perform(curl.get());
}
if(err==CURLE_OK){
long http_code = 0;
curl_easy_getinfo (curl.get(), CURLINFO_RESPONSE_CODE, &http_code);
response.status = http_code;
}else{
response.error = curl_easy_strerror(err);
response.status = -1;
}
if(headers){
curl_slist_free_all(headers);
}
return response;
}
int ofURLFileLoaderImpl::handleRequestAsync(const ofHttpRequest& request){
requests.send(request);
start();
return request.getId();
}
void ofURLFileLoaderImpl::update(ofEventArgs & args){
ofHttpResponse response;
while(responses.tryReceive(response)){
try{
response.request.done(response);
}catch(...){
}
ofNotifyEvent(ofURLResponseEvent(),response);
}
}
ofURLFileLoader::ofURLFileLoader()
:impl(new ofURLFileLoaderImpl){}
#endif
#ifdef TARGET_EMSCRIPTEN
#include "ofxEmscriptenURLFileLoader.h"
ofURLFileLoader::ofURLFileLoader()
:impl(new ofxEmscriptenURLFileLoader){}
#endif
ofHttpResponse ofURLFileLoader::get(const string& url){
return impl->get(url);
}
int ofURLFileLoader::getAsync(const string& url, const string& name){
return impl->getAsync(url,name);
}
ofHttpResponse ofURLFileLoader::saveTo(const string& url, const std::filesystem::path & path){
return impl->saveTo(url,path);
}
int ofURLFileLoader::saveAsync(const string& url, const std::filesystem::path & path){
return impl->saveAsync(url,path);
}
void ofURLFileLoader::remove(int id){
impl->remove(id);
}
void ofURLFileLoader::clear(){
impl->clear();
}
void ofURLFileLoader::stop(){
impl->stop();
}
ofHttpResponse ofURLFileLoader::handleRequest(const ofHttpRequest & request){
return impl->handleRequest(request);
}
int ofURLFileLoader::handleRequestAsync(const ofHttpRequest& request){
return impl->handleRequestAsync(request);
}
static bool initialized = false;
static ofURLFileLoader & getFileLoader(){
static ofURLFileLoader * fileLoader = new ofURLFileLoader;
initialized = true;
return *fileLoader;
}
ofHttpRequest::ofHttpRequest()
:saveTo(false)
,method(GET)
,id(nextID++)
{
}
ofHttpRequest::ofHttpRequest(const string& url, const string& name,bool saveTo)
:url(url)
,name(name)
,saveTo(saveTo)
,method(GET)
,id(nextID++)
{
}
int ofHttpRequest::getId() const {
return id;
}
int ofHttpRequest::getID(){
return id;
}
ofHttpResponse::ofHttpResponse()
:status(0)
{
}
ofHttpResponse::ofHttpResponse(const ofHttpRequest& request, const ofBuffer& data, int status, const string& error)
:request(request)
,data(data)
,status(status)
,error(error)
{
}
ofHttpResponse::ofHttpResponse(const ofHttpRequest& request, int status, const string& error)
:request(request)
,status(status)
,error(error)
{
}
ofHttpResponse::operator ofBuffer&(){
return data;
}
ofHttpResponse ofLoadURL(const string& url){
return getFileLoader().get(url);
}
int ofLoadURLAsync(const string& url, const string& name){
return getFileLoader().getAsync(url,name);
}
ofHttpResponse ofSaveURLTo(const string& url, const std::filesystem::path& path){
return getFileLoader().saveTo(url,path);
}
int ofSaveURLAsync(const string& url, const std::filesystem::path& path){
return getFileLoader().saveAsync(url,path);
}
void ofRemoveURLRequest(int id){
getFileLoader().remove(id);
}
void ofRemoveAllURLRequests(){
getFileLoader().clear();
}
void ofStopURLLoader(){
getFileLoader().stop();
}
void ofURLFileLoaderShutdown(){
if(initialized){
ofRemoveAllURLRequests();
ofStopURLLoader();
}
}