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Linux support for message passing (#27)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,6 +1,6 @@ | ||
| { | ||
| "alwaysActivate": true, | ||
| "name" : "SlimeVR", | ||
| "name" : "slimevr", | ||
| "directory" : "", | ||
| "resourceOnly" : false | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,170 @@ | ||
| /* | ||
| SlimeVR Code is placed under the MIT license | ||
| Copyright (c) 2021 Eiren Rain | ||
| Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| of this software and associated documentation files (the "Software"), to deal | ||
| in the Software without restriction, including without limitation the rights | ||
| to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| copies of the Software, and to permit persons to whom the Software is | ||
| furnished to do so, subject to the following conditions: | ||
| The above copyright notice and this permission notice shall be included in | ||
| all copies or substantial portions of the Software. | ||
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
| THE SOFTWARE. | ||
| */ | ||
| /** | ||
| * Linux specific IPC between SteamVR driver/app and SlimeVR server based | ||
| * on unix sockets | ||
| */ | ||
| #include "bridge.hpp" | ||
| #ifdef __linux__ | ||
| #include "unix-sockets.hpp" | ||
| #include <string_view> | ||
| #include <memory> | ||
|
|
||
| #define SOCKET_PATH "/tmp/SlimeVRDriver" | ||
|
|
||
| namespace { | ||
|
|
||
| inline constexpr int HEADER_SIZE = 4; | ||
| /// @return iterator after header | ||
| template <typename TBufIt> | ||
| std::optional<TBufIt> WriteHeader(TBufIt bufBegin, int bufSize, int msgSize) { | ||
| const int totalSize = msgSize + HEADER_SIZE; // include header bytes in total size | ||
| if (bufSize < totalSize) return std::nullopt; // header won't fit | ||
|
|
||
| const auto size = static_cast<uint32_t>(totalSize); | ||
| TBufIt it = bufBegin; | ||
| *(it++) = static_cast<uint8_t>(size); | ||
| *(it++) = static_cast<uint8_t>(size >> 8U); | ||
| *(it++) = static_cast<uint8_t>(size >> 16U); | ||
| *(it++) = static_cast<uint8_t>(size >> 24U); | ||
| return it; | ||
| } | ||
|
|
||
| /// @return iterator after header | ||
| template <typename TBufIt> | ||
| std::optional<TBufIt> ReadHeader(TBufIt bufBegin, int numBytesRecv, int& outMsgSize) { | ||
| if (numBytesRecv < HEADER_SIZE) return std::nullopt; // header won't fit | ||
|
|
||
| uint32_t size = 0; | ||
| TBufIt it = bufBegin; | ||
| size = static_cast<uint32_t>(*(it++)); | ||
| size |= static_cast<uint32_t>(*(it++)) << 8U; | ||
| size |= static_cast<uint32_t>(*(it++)) << 16U; | ||
| size |= static_cast<uint32_t>(*(it++)) << 24U; | ||
|
|
||
| const auto totalSize = static_cast<int>(size); | ||
| if (totalSize < HEADER_SIZE) return std::nullopt; | ||
| outMsgSize = totalSize - HEADER_SIZE; | ||
| return it; | ||
| } | ||
|
|
||
| BasicLocalClient client{}; | ||
|
|
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| inline constexpr int BUFFER_SIZE = 1024; | ||
| using ByteBuffer = std::array<uint8_t, BUFFER_SIZE>; | ||
| ByteBuffer byteBuffer; | ||
|
|
||
| } | ||
|
|
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| bool getNextBridgeMessage(messages::ProtobufMessage& message, SlimeVRDriver::VRDriver& driver) { | ||
| if (!client.IsOpen()) return false; | ||
|
|
||
| int bytesRecv = 0; | ||
| try { | ||
| bytesRecv = client.RecvOnce(byteBuffer.begin(), HEADER_SIZE); | ||
| } catch (const std::exception& e) { | ||
| client.Close(); | ||
| driver.Log("bridge send error: " + std::string(e.what())); | ||
| return false; | ||
| } | ||
| if (bytesRecv == 0) return false; // no message waiting | ||
|
|
||
| int msgSize = 0; | ||
| const std::optional msgBeginIt = ReadHeader(byteBuffer.begin(), bytesRecv, msgSize); | ||
| if (!msgBeginIt) { | ||
| driver.Log("bridge recv error: invalid message header or size"); | ||
| return false; | ||
| } | ||
| if (msgSize <= 0) { | ||
| driver.Log("bridge recv error: empty message"); | ||
| return false; | ||
| } | ||
| try { | ||
| if (!client.RecvAll(*msgBeginIt, msgSize)) { | ||
| driver.Log("bridge recv error: client closed"); | ||
| return false; | ||
| } | ||
| } catch (const std::exception& e) { | ||
| client.Close(); | ||
| driver.Log("bridge send error: " + std::string(e.what())); | ||
| return false; | ||
| } | ||
| if (!message.ParseFromArray(&(**msgBeginIt), msgSize)) { | ||
| driver.Log("bridge recv error: failed to parse"); | ||
| return false; | ||
| } | ||
|
|
||
| return true; | ||
| } | ||
|
|
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| bool sendBridgeMessage(messages::ProtobufMessage& message, SlimeVRDriver::VRDriver& driver) { | ||
| if (!client.IsOpen()) return false; | ||
| const auto bufBegin = byteBuffer.begin(); | ||
| const auto bufferSize = static_cast<int>(std::distance(bufBegin, byteBuffer.end())); | ||
| const auto msgSize = static_cast<int>(message.ByteSizeLong()); | ||
| const std::optional msgBeginIt = WriteHeader(bufBegin, bufferSize, msgSize); | ||
| if (!msgBeginIt) { | ||
| driver.Log("bridge send error: failed to write header"); | ||
| return false; | ||
| } | ||
| if (!message.SerializeToArray(&(**msgBeginIt), msgSize)) { | ||
| driver.Log("bridge send error: failed to serialize"); | ||
| return false; | ||
| } | ||
| int bytesToSend = static_cast<int>(std::distance(bufBegin, *msgBeginIt + msgSize)); | ||
| if (bytesToSend <= 0) { | ||
| driver.Log("bridge send error: empty message"); | ||
| return false; | ||
| } | ||
| if (bytesToSend > bufferSize) { | ||
| driver.Log("bridge send error: message too big"); | ||
| return false; | ||
| } | ||
| try { | ||
| return client.Send(bufBegin, bytesToSend); | ||
| } catch (const std::exception& e) { | ||
| client.Close(); | ||
| driver.Log("bridge send error: " + std::string(e.what())); | ||
| return false; | ||
| } | ||
| } | ||
|
|
||
| BridgeStatus runBridgeFrame(SlimeVRDriver::VRDriver& driver) { | ||
| try { | ||
| if (!client.IsOpen()) { | ||
| client.Open(SOCKET_PATH); | ||
| } | ||
| client.UpdateOnce(); | ||
|
|
||
| if (!client.IsOpen()) { | ||
| return BRIDGE_DISCONNECTED; | ||
| } | ||
| return BRIDGE_CONNECTED; | ||
| } catch (const std::exception& e) { | ||
| client.Close(); | ||
| driver.Log("bridge error: " + std::string(e.what())); | ||
| return BRIDGE_ERROR; | ||
| } | ||
| } | ||
|
|
||
| #endif // linux |
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