137 lines
3.9 KiB
C++
Executable file
137 lines
3.9 KiB
C++
Executable file
#include "rpc_connection.h"
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#include "serialization.h"
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#include <atomic>
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static const int RpcVersion = 1;
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static RpcConnection Instance;
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/*static*/ RpcConnection* RpcConnection::Create(const char* applicationId)
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{
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Instance.connection = BaseConnection::Create();
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StringCopy(Instance.appId, applicationId);
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return &Instance;
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}
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/*static*/ void RpcConnection::Destroy(RpcConnection*& c)
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{
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c->Close();
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BaseConnection::Destroy(c->connection);
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c = nullptr;
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}
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void RpcConnection::Open()
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{
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if (state == State::Connected) {
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return;
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}
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if (state == State::Disconnected && !connection->Open()) {
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return;
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}
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if (state == State::SentHandshake) {
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JsonDocument message;
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if (Read(message)) {
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auto cmd = GetStrMember(&message, "cmd");
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auto evt = GetStrMember(&message, "evt");
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if (cmd && evt && !strcmp(cmd, "DISPATCH") && !strcmp(evt, "READY")) {
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state = State::Connected;
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if (onConnect) {
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onConnect(message);
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}
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}
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}
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}
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else {
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sendFrame.opcode = Opcode::Handshake;
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sendFrame.length = (uint32_t)JsonWriteHandshakeObj(
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sendFrame.message, sizeof(sendFrame.message), RpcVersion, appId);
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if (connection->Write(&sendFrame, sizeof(MessageFrameHeader) + sendFrame.length)) {
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state = State::SentHandshake;
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}
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else {
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Close();
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}
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}
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}
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void RpcConnection::Close()
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{
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if (onDisconnect && (state == State::Connected || state == State::SentHandshake)) {
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onDisconnect(lastErrorCode, lastErrorMessage);
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}
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connection->Close();
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state = State::Disconnected;
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}
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bool RpcConnection::Write(const void* data, size_t length)
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{
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sendFrame.opcode = Opcode::Frame;
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memcpy(sendFrame.message, data, length);
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sendFrame.length = (uint32_t)length;
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if (!connection->Write(&sendFrame, sizeof(MessageFrameHeader) + length)) {
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Close();
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return false;
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}
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return true;
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}
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bool RpcConnection::Read(JsonDocument& message)
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{
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if (state != State::Connected && state != State::SentHandshake) {
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return false;
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}
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MessageFrame readFrame;
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for (;;) {
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bool didRead = connection->Read(&readFrame, sizeof(MessageFrameHeader));
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if (!didRead) {
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if (!connection->isOpen) {
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lastErrorCode = (int)ErrorCode::PipeClosed;
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StringCopy(lastErrorMessage, "Pipe closed");
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Close();
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}
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return false;
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}
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if (readFrame.length > 0) {
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didRead = connection->Read(readFrame.message, readFrame.length);
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if (!didRead) {
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lastErrorCode = (int)ErrorCode::ReadCorrupt;
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StringCopy(lastErrorMessage, "Partial data in frame");
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Close();
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return false;
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}
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readFrame.message[readFrame.length] = 0;
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}
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switch (readFrame.opcode) {
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case Opcode::Close: {
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message.ParseInsitu(readFrame.message);
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lastErrorCode = GetIntMember(&message, "code");
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StringCopy(lastErrorMessage, GetStrMember(&message, "message", ""));
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Close();
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return false;
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}
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case Opcode::Frame:
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message.ParseInsitu(readFrame.message);
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return true;
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case Opcode::Ping:
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readFrame.opcode = Opcode::Pong;
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if (!connection->Write(&readFrame, sizeof(MessageFrameHeader) + readFrame.length)) {
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Close();
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}
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break;
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case Opcode::Pong:
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break;
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case Opcode::Handshake:
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default:
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// something bad happened
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lastErrorCode = (int)ErrorCode::ReadCorrupt;
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StringCopy(lastErrorMessage, "Bad ipc frame");
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Close();
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return false;
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}
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}
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}
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