http-reader.cpp.svn-base
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上传日期:2018-11-18
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文件大小:8k
源码类别:
外挂编程
开发平台:
Windows_Unix
- /* Asynchronous HTTP client
- * Copyright (C) 2006 Written by VCL
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program 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 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- using namespace std;
- /**
- * A private class used by UnixHttpReader. Most of the logic are
- * contained in this class.
- *
- * The main reason this class exists is because it has reference counting
- * support. That is necessary because it is not safe to use Curl handles
- * in multiple threads, which complicates cancellation. Reference counting
- * support makes it possible to do the cancellation in the Curl thread,
- * while making UnixHttpReader's destructor non-blocking.
- */
- class Private: public HttpReader {
- private:
- unsigned int refCount;
- HttpReaderStatus status;
- char *error;
- char errorBuffer[CURL_ERROR_SIZE];
- int size;
- /** @invariant url != NULL */
- char *url;
- char *postData;
- int postDataSize;
- /** @invariant userAgent != NULL */
- char *userAgent;
- bool mutexInitialized;
- pthread_mutex_t mutex;
- pthread_t thread;
- CURL *handle;
- string downloadBuffer;
- static size_t
- writeCallback(void *ptr, size_t size, size_t nmemb, void *user_data) {
- Private *self = (Private *) user_data;
- self->lock();
- self->status = HTTP_READER_DOWNLOADING;
- self->downloadBuffer.append(static_cast<const char *>(ptr), size * nmemb);
- if (self->size == -1) {
- double length;
- curl_easy_getinfo(self->handle, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &length);
- if (length != 0) {
- self->size = (unsigned int) length;
- }
- }
- self->unlock();
- return size * nmemb;
- }
- /**
- * @require this->size == -1 && this->status == HTTP_READER_CONNECTING
- */
- static void *
- threadEntry(void *user_data) {
- Private *self = (Private *) user_data;
- self->handle = curl_easy_init();
- if (self->handle != NULL) {
- curl_easy_setopt(self->handle, CURLOPT_URL, self->url);
- curl_easy_setopt(self->handle, CURLOPT_FOLLOWLOCATION, 1);
- curl_easy_setopt(self->handle, CURLOPT_USERAGENT, self->userAgent);
- curl_easy_setopt(self->handle, CURLOPT_WRITEFUNCTION, writeCallback);
- curl_easy_setopt(self->handle, CURLOPT_WRITEDATA, self);
- curl_easy_setopt(self->handle, CURLOPT_FAILONERROR, 1);
- curl_easy_setopt(self->handle, CURLOPT_ERRORBUFFER, self->errorBuffer);
- if (self->postData != NULL) {
- curl_easy_setopt(self->handle, CURLOPT_POST, 1);
- curl_easy_setopt(self->handle, CURLOPT_POSTFIELDS, self->postData);
- curl_easy_setopt(self->handle, CURLOPT_POSTFIELDSIZE, self->postDataSize);
- }
- if (curl_easy_perform(self->handle) == 0) {
- self->lock();
- self->status = HTTP_READER_DONE;
- self->unlock();
- } else {
- self->lock();
- self->status = HTTP_READER_ERROR;
- self->error = self->errorBuffer;
- self->size = -2;
- self->unlock();
- }
- } else {
- self->lock();
- self->status = HTTP_READER_ERROR;
- self->error = "Cannot initialize libcurl.";
- self->size = -2;
- self->unlock();
- }
- self->unref();
- return NULL;
- }
- void
- lock() const {
- if (mutexInitialized) {
- pthread_mutex_lock((pthread_mutex_t *) &mutex);
- }
- }
- void
- unlock() const {
- if (mutexInitialized) {
- pthread_mutex_unlock((pthread_mutex_t *) &mutex);
- }
- }
- public:
- Private(const char *url, const char *postData, int postDataSize, const char *userAgent) {
- refCount = 1;
- this->url = NULL;
- this->postData = NULL;
- this->userAgent = NULL;
- handle = NULL;
- status = HTTP_READER_ERROR;
- size = -2;
- if (pthread_mutex_init(&mutex, NULL) != 0) {
- error = "Cannot initialize mutex.";
- mutexInitialized = false;
- return;
- } else {
- mutexInitialized = true;
- }
- pthread_attr_t attr;
- if (pthread_attr_init(&attr) != 0) {
- error = "Cannot create thread attribute object.";
- return;
- }
- if (pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0) {
- pthread_attr_destroy(&attr);
- error = "Cannot set thread attribute to detached.";
- return;
- }
- this->url = strdup(url);
- if (postData != NULL) {
- if (postDataSize == -1) {
- postDataSize = strlen(postData);
- }
- this->postData = (char *) malloc(postDataSize);
- if (this->postData != NULL) {
- memcpy(this->postData, postData, postDataSize);
- this->postDataSize = postDataSize;
- } else {
- error = "Cannot allocate memory for POST data.";
- return;
- }
- }
- this->userAgent = strdup(userAgent);
- status = HTTP_READER_CONNECTING;
- error = NULL;
- size = -1;
- ref();
- if (pthread_create(&thread, &attr, threadEntry, this) != 0) {
- unref();
- pthread_attr_destroy(&attr);
- status = HTTP_READER_ERROR;
- error = "Cannot create a thread.";
- size = -2;
- }
- }
- ~Private() {
- if (url != NULL)
- free(url);
- if (postData != NULL)
- free(postData);
- if (userAgent != NULL)
- free(userAgent);
- if (handle != NULL)
- curl_easy_cleanup(handle);
- if (mutexInitialized)
- pthread_mutex_destroy(&mutex);
- }
- /**
- * Increase the reference count by 1.
- */
- void
- ref() {
- lock();
- refCount++;
- unlock();
- }
- /**
- * Decrease the reference count by 1. The object will
- * be destroyed when the reference count drops to 0.
- */
- void
- unref() {
- bool mustDelete;
- lock();
- refCount--;
- mustDelete = refCount == 0;
- unlock();
- if (mustDelete) {
- delete this;
- }
- }
- virtual HttpReaderStatus
- getStatus() const {
- HttpReaderStatus result;
- lock();
- result = status;
- unlock();
- return result;
- }
- virtual const char *
- getError() const {
- const char *result;
- lock();
- result = error;
- unlock();
- return result;
- }
- virtual int
- pullData(void *buf, unsigned int size) {
- int result;
- lock();
- switch (status) {
- case HTTP_READER_ERROR:
- result = -2;
- break;
- case HTTP_READER_DONE:
- if (downloadBuffer.empty()) {
- result = 0;
- } else {
- result = (downloadBuffer.size() > size) ?
- size :
- downloadBuffer.size();
- downloadBuffer.copy(reinterpret_cast<char *>(buf), result);
- downloadBuffer.erase(0, result);
- }
- break;
- case HTTP_READER_DOWNLOADING:
- if (downloadBuffer.empty()) {
- result = -1;
- } else {
- result = (downloadBuffer.size() > size) ?
- size :
- downloadBuffer.size();
- downloadBuffer.copy(reinterpret_cast<char *>(buf), result);
- downloadBuffer.erase(0, result);
- }
- break;
- default:
- result = -2;
- fprintf(stderr, "StdHttpReader: invalid status %dn", status);
- abort();
- break;
- };
- unlock();
- return result;
- }
- virtual const char *
- getData(unsigned int &len) const {
- len = downloadBuffer.size();
- return downloadBuffer.data();
- }
- virtual int
- getSize() const {
- int result;
- lock();
- result = size;
- unlock();
- return result;
- }
- };
- class UnixHttpReader: public StdHttpReader {
- private:
- Private *priv;
- public:
- UnixHttpReader(const char *url,
- const char *postData,
- int postDataSize,
- const char *userAgent) {
- priv = new Private(url, postData, postDataSize, userAgent);
- }
- ~UnixHttpReader() {
- priv->unref();
- }
- virtual HttpReaderStatus
- getStatus() const {
- return priv->getStatus();
- }
- virtual const char *
- getError() const {
- assert(getStatus() == HTTP_READER_ERROR);
- return priv->getError();
- }
- virtual int
- pullData(void *buf, unsigned int size) {
- assert(getStatus() != HTTP_READER_CONNECTING);
- assert(buf != NULL);
- assert(size > 0);
- return priv->pullData(buf, size);
- }
- virtual const char *
- getData(unsigned int &len) const {
- assert(getStatus() == HTTP_READER_DONE);
- return priv->getData(len);
- }
- virtual int
- getSize() const {
- assert(getStatus() != HTTP_READER_CONNECTING);
- return priv->getSize();
- }
- static void
- init() {
- curl_global_init(CURL_GLOBAL_ALL);
- }
- };