hyperion.ng/libsrc/jsonserver/JsonClientConnection.cpp

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// system includes
#include <stdexcept>
#include <cassert>
// stl includes
#include <iostream>
#include <sstream>
#include <iterator>
// Qt includes
#include <QResource>
#include <QDateTime>
// hyperion util includes
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#include "hyperion/ImageProcessorFactory.h"
#include "hyperion/ImageProcessor.h"
#include "utils/ColorRgb.h"
// project includes
#include "JsonClientConnection.h"
JsonClientConnection::JsonClientConnection(QTcpSocket *socket, Hyperion * hyperion) :
QObject(),
_socket(socket),
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_imageProcessor(ImageProcessorFactory::getInstance().newImageProcessor()),
_hyperion(hyperion),
_receiveBuffer()
{
// connect internal signals and slots
connect(_socket, SIGNAL(disconnected()), this, SLOT(socketClosed()));
connect(_socket, SIGNAL(readyRead()), this, SLOT(readData()));
}
JsonClientConnection::~JsonClientConnection()
{
delete _socket;
}
void JsonClientConnection::readData()
{
_receiveBuffer += _socket->readAll();
int bytes = _receiveBuffer.indexOf('\n') + 1;
while(bytes > 0)
{
// create message string
std::string message(_receiveBuffer.data(), bytes);
// remove message data from buffer
_receiveBuffer = _receiveBuffer.mid(bytes);
// handle message
handleMessage(message);
// try too look up '\n' again
bytes = _receiveBuffer.indexOf('\n') + 1;
}
}
void JsonClientConnection::socketClosed()
{
emit connectionClosed(this);
}
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void JsonClientConnection::handleMessage(const std::string &messageString)
{
Json::Reader reader;
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Json::Value message;
if (!reader.parse(messageString, message, false))
{
sendErrorReply("Error while parsing json: " + reader.getFormattedErrorMessages());
return;
}
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// check basic message
std::string errors;
if (!checkJson(message, ":schema", errors))
{
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sendErrorReply("Error while validating json: " + errors);
return;
}
// check specific message
const std::string command = message["command"].asString();
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if (!checkJson(message, QString(":schema-%1").arg(QString::fromStdString(command)), errors))
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{
sendErrorReply("Error while validating json: " + errors);
return;
}
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// switch over all possible commands and handle them
if (command == "color")
handleColorCommand(message);
else if (command == "image")
handleImageCommand(message);
else if (command == "serverinfo")
handleServerInfoCommand(message);
else if (command == "clear")
handleClearCommand(message);
else if (command == "clearall")
handleClearallCommand(message);
else if (command == "transform")
handleTransformCommand(message);
else
handleNotImplemented();
}
void JsonClientConnection::handleColorCommand(const Json::Value &message)
{
// extract parameters
int priority = message["priority"].asInt();
int duration = message.get("duration", -1).asInt();
ColorRgb color = {uint8_t(message["color"][0u].asInt()), uint8_t(message["color"][1u].asInt()), uint8_t(message["color"][2u].asInt())};
// set output
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_hyperion->setColor(priority, color, duration);
// send reply
sendSuccessReply();
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}
void JsonClientConnection::handleImageCommand(const Json::Value &message)
{
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// extract parameters
int priority = message["priority"].asInt();
int duration = message.get("duration", -1).asInt();
int width = message["imagewidth"].asInt();
int height = message["imageheight"].asInt();
QByteArray data = QByteArray::fromBase64(QByteArray(message["imagedata"].asCString()));
// check consistency of the size of the received data
if (data.size() != width*height*3)
{
sendErrorReply("Size of image data does not match with the width and height");
return;
}
// set width and height of the image processor
_imageProcessor->setSize(width, height);
// create ImageRgb
Image<ColorRgb> image(width, height);
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memcpy(image.memptr(), data.data(), data.size());
// process the image
std::vector<ColorRgb> ledColors = _imageProcessor->process(image);
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_hyperion->setColors(priority, ledColors, duration);
// send reply
sendSuccessReply();
}
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void JsonClientConnection::handleServerInfoCommand(const Json::Value &message)
{
// create result
Json::Value result;
result["success"] = true;
Json::Value & info = result["info"];
// collect priority information
Json::Value & priorities = info["priorities"];
uint64_t now = QDateTime::currentMSecsSinceEpoch();
QList<int> activePriorities = _hyperion->getActivePriorities();
foreach (int priority, activePriorities) {
const Hyperion::InputInfo & priorityInfo = _hyperion->getPriorityInfo(priority);
Json::Value & item = priorities[priorities.size()];
item["priority"] = priority;
if (priorityInfo.timeoutTime_ms != -1)
{
item["duration_ms"] = priorityInfo.timeoutTime_ms - now;
}
}
// collect transform information
Json::Value & transform = info["transform"];
transform["saturationGain"] = _hyperion->getTransform(Hyperion::SATURATION_GAIN, Hyperion::INVALID);
transform["valueGain"] = _hyperion->getTransform(Hyperion::VALUE_GAIN, Hyperion::INVALID);
Json::Value & threshold = transform["threshold"];
threshold.append(_hyperion->getTransform(Hyperion::THRESHOLD, Hyperion::RED));
threshold.append(_hyperion->getTransform(Hyperion::THRESHOLD, Hyperion::GREEN));
threshold.append(_hyperion->getTransform(Hyperion::THRESHOLD, Hyperion::BLUE));
Json::Value & gamma = transform["gamma"];
gamma.append(_hyperion->getTransform(Hyperion::GAMMA, Hyperion::RED));
gamma.append(_hyperion->getTransform(Hyperion::GAMMA, Hyperion::GREEN));
gamma.append(_hyperion->getTransform(Hyperion::GAMMA, Hyperion::BLUE));
Json::Value & blacklevel = transform["blacklevel"];
blacklevel.append(_hyperion->getTransform(Hyperion::BLACKLEVEL, Hyperion::RED));
blacklevel.append(_hyperion->getTransform(Hyperion::BLACKLEVEL, Hyperion::GREEN));
blacklevel.append(_hyperion->getTransform(Hyperion::BLACKLEVEL, Hyperion::BLUE));
Json::Value & whitelevel = transform["whitelevel"];
whitelevel.append(_hyperion->getTransform(Hyperion::WHITELEVEL, Hyperion::RED));
whitelevel.append(_hyperion->getTransform(Hyperion::WHITELEVEL, Hyperion::GREEN));
whitelevel.append(_hyperion->getTransform(Hyperion::WHITELEVEL, Hyperion::BLUE));
// send the result
sendMessage(result);
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}
void JsonClientConnection::handleClearCommand(const Json::Value &message)
{
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// extract parameters
int priority = message["priority"].asInt();
// clear priority
_hyperion->clear(priority);
// send reply
sendSuccessReply();
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}
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void JsonClientConnection::handleClearallCommand(const Json::Value &)
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{
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// clear priority
_hyperion->clearall();
// send reply
sendSuccessReply();
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}
void JsonClientConnection::handleTransformCommand(const Json::Value &message)
{
const Json::Value & transform = message["transform"];
if (transform.isMember("saturationGain"))
{
_hyperion->setTransform(Hyperion::SATURATION_GAIN, Hyperion::INVALID, transform["saturationGain"].asDouble());
}
if (transform.isMember("valueGain"))
{
_hyperion->setTransform(Hyperion::VALUE_GAIN, Hyperion::INVALID, transform["valueGain"].asDouble());
}
if (transform.isMember("threshold"))
{
const Json::Value & threshold = transform["threshold"];
_hyperion->setTransform(Hyperion::THRESHOLD, Hyperion::RED, threshold[0u].asDouble());
_hyperion->setTransform(Hyperion::THRESHOLD, Hyperion::GREEN, threshold[1u].asDouble());
_hyperion->setTransform(Hyperion::THRESHOLD, Hyperion::BLUE, threshold[2u].asDouble());
}
if (transform.isMember("gamma"))
{
const Json::Value & threshold = transform["gamma"];
_hyperion->setTransform(Hyperion::GAMMA, Hyperion::RED, threshold[0u].asDouble());
_hyperion->setTransform(Hyperion::GAMMA, Hyperion::GREEN, threshold[1u].asDouble());
_hyperion->setTransform(Hyperion::GAMMA, Hyperion::BLUE, threshold[2u].asDouble());
}
if (transform.isMember("blacklevel"))
{
const Json::Value & threshold = transform["blacklevel"];
_hyperion->setTransform(Hyperion::BLACKLEVEL, Hyperion::RED, threshold[0u].asDouble());
_hyperion->setTransform(Hyperion::BLACKLEVEL, Hyperion::GREEN, threshold[1u].asDouble());
_hyperion->setTransform(Hyperion::BLACKLEVEL, Hyperion::BLUE, threshold[2u].asDouble());
}
if (transform.isMember("whitelevel"))
{
const Json::Value & threshold = transform["whitelevel"];
_hyperion->setTransform(Hyperion::WHITELEVEL, Hyperion::RED, threshold[0u].asDouble());
_hyperion->setTransform(Hyperion::WHITELEVEL, Hyperion::GREEN, threshold[1u].asDouble());
_hyperion->setTransform(Hyperion::WHITELEVEL, Hyperion::BLUE, threshold[2u].asDouble());
}
sendSuccessReply();
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}
void JsonClientConnection::handleNotImplemented()
{
sendErrorReply("Command not implemented");
}
void JsonClientConnection::sendMessage(const Json::Value &message)
{
Json::FastWriter writer;
std::string serializedReply = writer.write(message);
_socket->write(serializedReply.data(), serializedReply.length());
}
void JsonClientConnection::sendSuccessReply()
{
// create reply
Json::Value reply;
reply["success"] = true;
// send reply
sendMessage(reply);
}
void JsonClientConnection::sendErrorReply(const std::string &error)
{
// create reply
Json::Value reply;
reply["success"] = false;
reply["error"] = error;
// send reply
sendMessage(reply);
}
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bool JsonClientConnection::checkJson(const Json::Value & message, const QString & schemaResource, std::string & errorMessage)
{
// read the json schema from the resource
QResource schemaData(schemaResource);
assert(schemaData.isValid());
Json::Reader jsonReader;
Json::Value schemaJson;
if (!jsonReader.parse(reinterpret_cast<const char *>(schemaData.data()), reinterpret_cast<const char *>(schemaData.data()) + schemaData.size(), schemaJson, false))
{
throw std::runtime_error("Schema error: " + jsonReader.getFormattedErrorMessages()) ;
}
// create schema checker
JsonSchemaChecker schema;
schema.setSchema(schemaJson);
// check the message
if (!schema.validate(message))
{
const std::list<std::string> & errors = schema.getMessages();
std::stringstream ss;
ss << "{";
foreach (const std::string & error, errors) {
ss << error << " ";
}
ss << "}";
errorMessage = ss.str();
return false;
}
return true;
}