Adriana Kobylak | 1bfbe0e | 2019-01-17 12:08:38 -0600 | [diff] [blame] | 1 | #pragma once |
| 2 | |
Ed Tanous | c94ad49 | 2019-10-10 15:39:33 -0700 | [diff] [blame] | 3 | #include <app.h> |
Ed Tanous | c94ad49 | 2019-10-10 15:39:33 -0700 | [diff] [blame] | 4 | #include <websocket.h> |
Adriana Kobylak | 1bfbe0e | 2019-01-17 12:08:38 -0600 | [diff] [blame] | 5 | |
| 6 | #include <boost/beast/core/flat_static_buffer.hpp> |
| 7 | #include <boost/process.hpp> |
Ed Tanous | 9e27a22 | 2019-10-24 13:46:39 -0700 | [diff] [blame] | 8 | #include <csignal> |
Adriana Kobylak | 1bfbe0e | 2019-01-17 12:08:38 -0600 | [diff] [blame] | 9 | #include <webserver_common.hpp> |
| 10 | |
| 11 | namespace crow |
| 12 | { |
| 13 | namespace obmc_vm |
| 14 | { |
| 15 | |
| 16 | static crow::websocket::Connection* session = nullptr; |
| 17 | |
| 18 | // The max network block device buffer size is 128kb plus 16bytes |
| 19 | // for the message header: |
| 20 | // https://github.com/NetworkBlockDevice/nbd/blob/master/doc/proto.md#simple-reply-message |
| 21 | static constexpr auto nbdBufferSize = 131088; |
| 22 | |
| 23 | class Handler : public std::enable_shared_from_this<Handler> |
| 24 | { |
| 25 | public: |
Ed Tanous | 271584a | 2019-07-09 16:24:22 -0700 | [diff] [blame] | 26 | Handler(const std::string& mediaIn, boost::asio::io_context& ios) : |
| 27 | pipeOut(ios), pipeIn(ios), media(mediaIn), doingWrite(false), |
Adriana Kobylak | 1bfbe0e | 2019-01-17 12:08:38 -0600 | [diff] [blame] | 28 | outputBuffer(new boost::beast::flat_static_buffer<nbdBufferSize>), |
| 29 | inputBuffer(new boost::beast::flat_static_buffer<nbdBufferSize>) |
| 30 | { |
| 31 | } |
| 32 | |
Ed Tanous | 0c0084a | 2019-10-24 15:57:51 -0700 | [diff] [blame] | 33 | ~Handler() = default; |
Adriana Kobylak | 1bfbe0e | 2019-01-17 12:08:38 -0600 | [diff] [blame] | 34 | |
| 35 | void doClose() |
| 36 | { |
| 37 | // boost::process::child::terminate uses SIGKILL, need to send SIGTERM |
| 38 | // to allow the proxy to stop nbd-client and the USB device gadget. |
| 39 | int rc = kill(proxy.id(), SIGTERM); |
| 40 | if (rc) |
| 41 | { |
| 42 | return; |
| 43 | } |
| 44 | proxy.wait(); |
| 45 | } |
| 46 | |
| 47 | void connect() |
| 48 | { |
| 49 | std::error_code ec; |
| 50 | proxy = boost::process::child("/usr/sbin/nbd-proxy", media, |
| 51 | boost::process::std_out > pipeOut, |
| 52 | boost::process::std_in < pipeIn, ec); |
| 53 | if (ec) |
| 54 | { |
| 55 | BMCWEB_LOG_ERROR << "Couldn't connect to nbd-proxy: " |
| 56 | << ec.message(); |
| 57 | if (session != nullptr) |
| 58 | { |
| 59 | session->close("Error connecting to nbd-proxy"); |
| 60 | } |
| 61 | return; |
| 62 | } |
| 63 | doWrite(); |
| 64 | doRead(); |
| 65 | } |
| 66 | |
| 67 | void doWrite() |
| 68 | { |
| 69 | if (doingWrite) |
| 70 | { |
| 71 | BMCWEB_LOG_DEBUG << "Already writing. Bailing out"; |
| 72 | return; |
| 73 | } |
| 74 | |
| 75 | if (inputBuffer->size() == 0) |
| 76 | { |
| 77 | BMCWEB_LOG_DEBUG << "inputBuffer empty. Bailing out"; |
| 78 | return; |
| 79 | } |
| 80 | |
| 81 | doingWrite = true; |
| 82 | pipeIn.async_write_some( |
| 83 | inputBuffer->data(), |
| 84 | [this, self(shared_from_this())](boost::beast::error_code ec, |
| 85 | std::size_t bytesWritten) { |
| 86 | BMCWEB_LOG_DEBUG << "Wrote " << bytesWritten << "bytes"; |
| 87 | doingWrite = false; |
| 88 | inputBuffer->consume(bytesWritten); |
| 89 | |
| 90 | if (session == nullptr) |
| 91 | { |
| 92 | return; |
| 93 | } |
| 94 | if (ec == boost::asio::error::eof) |
| 95 | { |
| 96 | session->close("VM socket port closed"); |
| 97 | return; |
| 98 | } |
| 99 | if (ec) |
| 100 | { |
| 101 | session->close("Error in writing to proxy port"); |
| 102 | BMCWEB_LOG_ERROR << "Error in VM socket write " << ec; |
| 103 | return; |
| 104 | } |
| 105 | doWrite(); |
| 106 | }); |
| 107 | } |
| 108 | |
| 109 | void doRead() |
| 110 | { |
| 111 | std::size_t bytes = outputBuffer->capacity() - outputBuffer->size(); |
| 112 | |
| 113 | pipeOut.async_read_some( |
| 114 | outputBuffer->prepare(bytes), |
| 115 | [this, self(shared_from_this())]( |
| 116 | const boost::system::error_code& ec, std::size_t bytesRead) { |
| 117 | BMCWEB_LOG_DEBUG << "Read done. Read " << bytesRead |
| 118 | << " bytes"; |
| 119 | if (ec) |
| 120 | { |
| 121 | BMCWEB_LOG_ERROR << "Couldn't read from VM port: " << ec; |
| 122 | if (session != nullptr) |
| 123 | { |
| 124 | session->close("Error in connecting to VM port"); |
| 125 | } |
| 126 | return; |
| 127 | } |
| 128 | if (session == nullptr) |
| 129 | { |
| 130 | return; |
| 131 | } |
| 132 | |
| 133 | outputBuffer->commit(bytesRead); |
| 134 | std::string_view payload( |
| 135 | static_cast<const char*>(outputBuffer->data().data()), |
| 136 | bytesRead); |
| 137 | session->sendBinary(payload); |
| 138 | outputBuffer->consume(bytesRead); |
| 139 | |
| 140 | doRead(); |
| 141 | }); |
| 142 | } |
| 143 | |
| 144 | boost::process::async_pipe pipeOut; |
| 145 | boost::process::async_pipe pipeIn; |
| 146 | boost::process::child proxy; |
| 147 | std::string media; |
| 148 | bool doingWrite; |
| 149 | |
| 150 | std::unique_ptr<boost::beast::flat_static_buffer<nbdBufferSize>> |
| 151 | outputBuffer; |
| 152 | std::unique_ptr<boost::beast::flat_static_buffer<nbdBufferSize>> |
| 153 | inputBuffer; |
| 154 | }; |
| 155 | |
| 156 | static std::shared_ptr<Handler> handler; |
| 157 | |
| 158 | template <typename... Middlewares> void requestRoutes(Crow<Middlewares...>& app) |
| 159 | { |
| 160 | BMCWEB_ROUTE(app, "/vm/0/0") |
Ed Tanous | 8251ffe | 2019-10-10 14:33:54 -0700 | [diff] [blame] | 161 | .requires({"ConfigureComponents", "ConfigureManager"}) |
Adriana Kobylak | 1bfbe0e | 2019-01-17 12:08:38 -0600 | [diff] [blame] | 162 | .websocket() |
Iwona Klimaszewska | c0a1c8a | 2019-07-12 18:26:38 +0200 | [diff] [blame] | 163 | .onopen([](crow::websocket::Connection& conn, |
| 164 | std::shared_ptr<bmcweb::AsyncResp> asyncResp) { |
Adriana Kobylak | 1bfbe0e | 2019-01-17 12:08:38 -0600 | [diff] [blame] | 165 | BMCWEB_LOG_DEBUG << "Connection " << &conn << " opened"; |
| 166 | |
| 167 | if (session != nullptr) |
| 168 | { |
| 169 | conn.close("Session already connected"); |
| 170 | return; |
| 171 | } |
| 172 | |
| 173 | if (handler != nullptr) |
| 174 | { |
| 175 | conn.close("Handler already running"); |
| 176 | return; |
| 177 | } |
| 178 | |
| 179 | session = &conn; |
| 180 | |
| 181 | // media is the last digit of the endpoint /vm/0/0. A future |
| 182 | // enhancement can include supporting different endpoint values. |
| 183 | const char* media = "0"; |
| 184 | handler = std::make_shared<Handler>(media, conn.get_io_context()); |
| 185 | handler->connect(); |
| 186 | }) |
| 187 | .onclose( |
| 188 | [](crow::websocket::Connection& conn, const std::string& reason) { |
| 189 | session = nullptr; |
| 190 | handler->doClose(); |
| 191 | #if BOOST_VERSION >= 107000 |
| 192 | handler->inputBuffer->clear(); |
| 193 | handler->outputBuffer->clear(); |
| 194 | #else |
| 195 | handler->inputBuffer->reset(); |
| 196 | handler->outputBuffer->reset(); |
| 197 | #endif |
| 198 | handler.reset(); |
| 199 | }) |
| 200 | .onmessage([](crow::websocket::Connection& conn, |
| 201 | const std::string& data, bool is_binary) { |
| 202 | if (data.length() > handler->inputBuffer->capacity()) |
| 203 | { |
| 204 | BMCWEB_LOG_ERROR << "Buffer overrun when writing " |
| 205 | << data.length() << " bytes"; |
| 206 | conn.close("Buffer overrun"); |
| 207 | return; |
| 208 | } |
| 209 | |
| 210 | boost::asio::buffer_copy(handler->inputBuffer->prepare(data.size()), |
| 211 | boost::asio::buffer(data)); |
| 212 | handler->inputBuffer->commit(data.size()); |
| 213 | handler->doWrite(); |
| 214 | }); |
| 215 | } |
| 216 | |
| 217 | } // namespace obmc_vm |
| 218 | } // namespace crow |