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-rw-r--r--src/ipc/capnp/.gitignore2
-rw-r--r--src/ipc/capnp/echo.capnp17
-rw-r--r--src/ipc/capnp/init-types.h10
-rw-r--r--src/ipc/capnp/init.capnp20
-rw-r--r--src/ipc/capnp/protocol.cpp90
-rw-r--r--src/ipc/capnp/protocol.h17
6 files changed, 156 insertions, 0 deletions
diff --git a/src/ipc/capnp/.gitignore b/src/ipc/capnp/.gitignore
new file mode 100644
index 0000000000..036df1430c
--- /dev/null
+++ b/src/ipc/capnp/.gitignore
@@ -0,0 +1,2 @@
+# capnp generated files
+*.capnp.*
diff --git a/src/ipc/capnp/echo.capnp b/src/ipc/capnp/echo.capnp
new file mode 100644
index 0000000000..df36ee0de3
--- /dev/null
+++ b/src/ipc/capnp/echo.capnp
@@ -0,0 +1,17 @@
+# Copyright (c) 2021 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+@0x888b4f7f51e691f7;
+
+using Cxx = import "/capnp/c++.capnp";
+$Cxx.namespace("ipc::capnp::messages");
+
+using Proxy = import "/mp/proxy.capnp";
+$Proxy.include("interfaces/echo.h");
+$Proxy.include("ipc/capnp/echo.capnp.h");
+
+interface Echo $Proxy.wrap("interfaces::Echo") {
+ destroy @0 (context :Proxy.Context) -> ();
+ echo @1 (context :Proxy.Context, echo: Text) -> (result :Text);
+}
diff --git a/src/ipc/capnp/init-types.h b/src/ipc/capnp/init-types.h
new file mode 100644
index 0000000000..42031441b5
--- /dev/null
+++ b/src/ipc/capnp/init-types.h
@@ -0,0 +1,10 @@
+// Copyright (c) 2021 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_IPC_CAPNP_INIT_TYPES_H
+#define BITCOIN_IPC_CAPNP_INIT_TYPES_H
+
+#include <ipc/capnp/echo.capnp.proxy-types.h>
+
+#endif // BITCOIN_IPC_CAPNP_INIT_TYPES_H
diff --git a/src/ipc/capnp/init.capnp b/src/ipc/capnp/init.capnp
new file mode 100644
index 0000000000..e6d358c665
--- /dev/null
+++ b/src/ipc/capnp/init.capnp
@@ -0,0 +1,20 @@
+# Copyright (c) 2021 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+@0xf2c5cfa319406aa6;
+
+using Cxx = import "/capnp/c++.capnp";
+$Cxx.namespace("ipc::capnp::messages");
+
+using Proxy = import "/mp/proxy.capnp";
+$Proxy.include("interfaces/echo.h");
+$Proxy.include("interfaces/init.h");
+$Proxy.includeTypes("ipc/capnp/init-types.h");
+
+using Echo = import "echo.capnp";
+
+interface Init $Proxy.wrap("interfaces::Init") {
+ construct @0 (threadMap: Proxy.ThreadMap) -> (threadMap :Proxy.ThreadMap);
+ makeEcho @1 (context :Proxy.Context) -> (result :Echo.Echo);
+}
diff --git a/src/ipc/capnp/protocol.cpp b/src/ipc/capnp/protocol.cpp
new file mode 100644
index 0000000000..74c66c899a
--- /dev/null
+++ b/src/ipc/capnp/protocol.cpp
@@ -0,0 +1,90 @@
+// Copyright (c) 2021 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <interfaces/init.h>
+#include <ipc/capnp/init.capnp.h>
+#include <ipc/capnp/init.capnp.proxy.h>
+#include <ipc/capnp/protocol.h>
+#include <ipc/exception.h>
+#include <ipc/protocol.h>
+#include <kj/async.h>
+#include <logging.h>
+#include <mp/proxy-io.h>
+#include <mp/proxy-types.h>
+#include <mp/util.h>
+#include <util/threadnames.h>
+
+#include <assert.h>
+#include <errno.h>
+#include <future>
+#include <memory>
+#include <mutex>
+#include <optional>
+#include <string>
+#include <thread>
+
+namespace ipc {
+namespace capnp {
+namespace {
+void IpcLogFn(bool raise, std::string message)
+{
+ LogPrint(BCLog::IPC, "%s\n", message);
+ if (raise) throw Exception(message);
+}
+
+class CapnpProtocol : public Protocol
+{
+public:
+ ~CapnpProtocol() noexcept(true)
+ {
+ if (m_loop) {
+ std::unique_lock<std::mutex> lock(m_loop->m_mutex);
+ m_loop->removeClient(lock);
+ }
+ if (m_loop_thread.joinable()) m_loop_thread.join();
+ assert(!m_loop);
+ };
+ std::unique_ptr<interfaces::Init> connect(int fd, const char* exe_name) override
+ {
+ startLoop(exe_name);
+ return mp::ConnectStream<messages::Init>(*m_loop, fd);
+ }
+ void serve(int fd, const char* exe_name, interfaces::Init& init) override
+ {
+ assert(!m_loop);
+ mp::g_thread_context.thread_name = mp::ThreadName(exe_name);
+ m_loop.emplace(exe_name, &IpcLogFn, nullptr);
+ mp::ServeStream<messages::Init>(*m_loop, fd, init);
+ m_loop->loop();
+ m_loop.reset();
+ }
+ void addCleanup(std::type_index type, void* iface, std::function<void()> cleanup) override
+ {
+ mp::ProxyTypeRegister::types().at(type)(iface).cleanup.emplace_back(std::move(cleanup));
+ }
+ void startLoop(const char* exe_name)
+ {
+ if (m_loop) return;
+ std::promise<void> promise;
+ m_loop_thread = std::thread([&] {
+ util::ThreadRename("capnp-loop");
+ m_loop.emplace(exe_name, &IpcLogFn, nullptr);
+ {
+ std::unique_lock<std::mutex> lock(m_loop->m_mutex);
+ m_loop->addClient(lock);
+ }
+ promise.set_value();
+ m_loop->loop();
+ m_loop.reset();
+ });
+ promise.get_future().wait();
+ }
+ std::thread m_loop_thread;
+ std::optional<mp::EventLoop> m_loop;
+};
+} // namespace
+
+std::unique_ptr<Protocol> MakeCapnpProtocol() { return std::make_unique<CapnpProtocol>(); }
+} // namespace capnp
+} // namespace ipc
diff --git a/src/ipc/capnp/protocol.h b/src/ipc/capnp/protocol.h
new file mode 100644
index 0000000000..eb057949d2
--- /dev/null
+++ b/src/ipc/capnp/protocol.h
@@ -0,0 +1,17 @@
+// Copyright (c) 2021 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_IPC_CAPNP_PROTOCOL_H
+#define BITCOIN_IPC_CAPNP_PROTOCOL_H
+
+#include <memory>
+
+namespace ipc {
+class Protocol;
+namespace capnp {
+std::unique_ptr<Protocol> MakeCapnpProtocol();
+} // namespace capnp
+} // namespace ipc
+
+#endif // BITCOIN_IPC_CAPNP_PROTOCOL_H