gpt4all/gpt4all-chat/chatgpt.cpp

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#include "chatgpt.h"
#include <string>
#include <vector>
#include <iostream>
#include <QCoreApplication>
#include <QThread>
#include <QEventLoop>
#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonArray>
//#define DEBUG
ChatGPT::ChatGPT()
: QObject(nullptr)
, m_modelName("gpt-3.5-turbo")
, m_responseCallback(nullptr)
{
}
size_t ChatGPT::requiredMem(const std::string &modelPath, int n_ctx, int ngl)
{
Q_UNUSED(modelPath);
Q_UNUSED(n_ctx);
Q_UNUSED(ngl);
return 0;
}
bool ChatGPT::loadModel(const std::string &modelPath, int n_ctx, int ngl)
{
Q_UNUSED(modelPath);
Q_UNUSED(n_ctx);
Q_UNUSED(ngl);
return true;
}
void ChatGPT::setThreadCount(int32_t n_threads)
{
Q_UNUSED(n_threads);
qt_noop();
}
int32_t ChatGPT::threadCount() const
{
return 1;
}
ChatGPT::~ChatGPT()
{
}
bool ChatGPT::isModelLoaded() const
{
return true;
}
// All three of the state virtual functions are handled custom inside of chatllm save/restore
size_t ChatGPT::stateSize() const
{
return 0;
}
size_t ChatGPT::saveState(uint8_t *dest) const
{
Q_UNUSED(dest);
return 0;
}
size_t ChatGPT::restoreState(const uint8_t *src)
{
Q_UNUSED(src);
return 0;
}
void ChatGPT::prompt(const std::string &prompt,
std::function<bool(int32_t)> promptCallback,
std::function<bool(int32_t, const std::string&)> responseCallback,
std::function<bool(bool)> recalculateCallback,
PromptContext &promptCtx) {
Q_UNUSED(promptCallback);
Q_UNUSED(recalculateCallback);
if (!isModelLoaded()) {
std::cerr << "ChatGPT ERROR: prompt won't work with an unloaded model!\n";
return;
}
// FIXME: We don't set the max_tokens on purpose because in order to do so safely without encountering
// an error we need to be able to count the tokens in our prompt. The only way to do this is to use
// the OpenAI tiktokken library or to implement our own tokenization function that matches precisely
// the tokenization used by the OpenAI model we're calling. OpenAI has not introduced any means of
// using the REST API to count tokens in a prompt.
QJsonObject root;
root.insert("model", m_modelName);
root.insert("stream", true);
root.insert("temperature", promptCtx.temp);
root.insert("top_p", promptCtx.top_p);
QJsonArray messages;
for (int i = 0; i < m_context.count() && i < promptCtx.n_past; ++i) {
QJsonObject message;
message.insert("role", i % 2 == 0 ? "assistant" : "user");
message.insert("content", m_context.at(i));
messages.append(message);
}
QJsonObject promptObject;
promptObject.insert("role", "user");
promptObject.insert("content", QString::fromStdString(prompt));
messages.append(promptObject);
root.insert("messages", messages);
QJsonDocument doc(root);
#if defined(DEBUG)
qDebug() << "ChatGPT::prompt begin network request" << qPrintable(doc.toJson());
#endif
m_responseCallback = responseCallback;
// The following code sets up a worker thread and object to perform the actual api request to
// chatgpt and then blocks until it is finished
QThread workerThread;
ChatGPTWorker worker(this);
worker.moveToThread(&workerThread);
connect(&worker, &ChatGPTWorker::finished, &workerThread, &QThread::quit, Qt::DirectConnection);
connect(this, &ChatGPT::request, &worker, &ChatGPTWorker::request, Qt::QueuedConnection);
workerThread.start();
emit request(m_apiKey, &promptCtx, doc.toJson(QJsonDocument::Compact));
workerThread.wait();
promptCtx.n_past += 1;
m_context.append(QString::fromStdString(prompt));
m_context.append(worker.currentResponse());
m_responseCallback = nullptr;
#if defined(DEBUG)
qDebug() << "ChatGPT::prompt end network request";
#endif
}
bool ChatGPT::callResponse(int32_t token, const std::string& string)
{
Q_ASSERT(m_responseCallback);
if (!m_responseCallback) {
std::cerr << "ChatGPT ERROR: no response callback!\n";
return false;
}
return m_responseCallback(token, string);
}
void ChatGPTWorker::request(const QString &apiKey,
LLModel::PromptContext *promptCtx,
const QByteArray &array)
{
m_ctx = promptCtx;
QUrl openaiUrl("https://api.openai.com/v1/chat/completions");
const QString authorization = QString("Bearer %1").arg(apiKey).trimmed();
QNetworkRequest request(openaiUrl);
request.setHeader(QNetworkRequest::ContentTypeHeader, "application/json");
request.setRawHeader("Authorization", authorization.toUtf8());
m_networkManager = new QNetworkAccessManager(this);
QNetworkReply *reply = m_networkManager->post(request, array);
connect(qApp, &QCoreApplication::aboutToQuit, reply, &QNetworkReply::abort);
connect(reply, &QNetworkReply::finished, this, &ChatGPTWorker::handleFinished);
connect(reply, &QNetworkReply::readyRead, this, &ChatGPTWorker::handleReadyRead);
connect(reply, &QNetworkReply::errorOccurred, this, &ChatGPTWorker::handleErrorOccurred);
}
void ChatGPTWorker::handleFinished()
{
QNetworkReply *reply = qobject_cast<QNetworkReply *>(sender());
if (!reply) {
emit finished();
return;
}
QVariant response = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute);
Q_ASSERT(response.isValid());
bool ok;
int code = response.toInt(&ok);
if (!ok || code != 200) {
qWarning() << QString("ERROR: ChatGPT responded with error code \"%1-%2\"")
.arg(code).arg(reply->errorString()).toStdString();
}
reply->deleteLater();
emit finished();
}
void ChatGPTWorker::handleReadyRead()
{
QNetworkReply *reply = qobject_cast<QNetworkReply *>(sender());
if (!reply) {
emit finished();
return;
}
QVariant response = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute);
Q_ASSERT(response.isValid());
bool ok;
int code = response.toInt(&ok);
if (!ok || code != 200) {
m_chat->callResponse(-1, QString("\nERROR: 2 ChatGPT responded with error code \"%1-%2\" %3\n")
.arg(code).arg(reply->errorString()).arg(qPrintable(reply->readAll())).toStdString());
emit finished();
return;
}
while (reply->canReadLine()) {
QString jsonData = reply->readLine().trimmed();
if (jsonData.startsWith("data:"))
jsonData.remove(0, 5);
jsonData = jsonData.trimmed();
if (jsonData.isEmpty())
continue;
if (jsonData == "[DONE]")
continue;
#if defined(DEBUG)
qDebug() << "line" << qPrintable(jsonData);
#endif
QJsonParseError err;
const QJsonDocument document = QJsonDocument::fromJson(jsonData.toUtf8(), &err);
if (err.error != QJsonParseError::NoError) {
m_chat->callResponse(-1, QString("\nERROR: ChatGPT responded with invalid json \"%1\"\n")
.arg(err.errorString()).toStdString());
continue;
}
const QJsonObject root = document.object();
const QJsonArray choices = root.value("choices").toArray();
const QJsonObject choice = choices.first().toObject();
const QJsonObject delta = choice.value("delta").toObject();
const QString content = delta.value("content").toString();
Q_ASSERT(m_ctx);
m_currentResponse += content;
if (!m_chat->callResponse(0, content.toStdString())) {
reply->abort();
emit finished();
return;
}
}
}
void ChatGPTWorker::handleErrorOccurred(QNetworkReply::NetworkError code)
{
QNetworkReply *reply = qobject_cast<QNetworkReply *>(sender());
if (!reply || reply->error() == QNetworkReply::OperationCanceledError /*when we call abort on purpose*/) {
emit finished();
return;
}
qWarning() << QString("ERROR: ChatGPT responded with error code \"%1-%2\"")
.arg(code).arg(reply->errorString()).toStdString();
emit finished();
}