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// Copyright (c) 2013-2014 Sandstorm Development Group, Inc. and contributors
// Licensed under the MIT License:
//
// 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.
#include "rpc-twoparty.h"
#include "serialize-async.h"
#include <kj/debug.h>
namespace capnp {
TwoPartyVatNetwork::TwoPartyVatNetwork(kj::AsyncIoStream& stream, rpc::twoparty::Side side,
ReaderOptions receiveOptions)
: stream(stream), side(side), receiveOptions(receiveOptions), previousWrite(kj::READY_NOW) {
auto paf = kj::newPromiseAndFulfiller<void>();
disconnectPromise = paf.promise.fork();
disconnectFulfiller.fulfiller = kj::mv(paf.fulfiller);
}
void TwoPartyVatNetwork::FulfillerDisposer::disposeImpl(void* pointer) const {
if (--refcount == 0) {
fulfiller->fulfill();
}
}
kj::Own<TwoPartyVatNetworkBase::Connection> TwoPartyVatNetwork::asConnection() {
++disconnectFulfiller.refcount;
return kj::Own<TwoPartyVatNetworkBase::Connection>(this, disconnectFulfiller);
}
kj::Maybe<kj::Own<TwoPartyVatNetworkBase::Connection>> TwoPartyVatNetwork::connectToRefHost(
rpc::twoparty::SturdyRefHostId::Reader ref) {
if (ref.getSide() == side) {
return nullptr;
} else {
return asConnection();
}
}
kj::Promise<kj::Own<TwoPartyVatNetworkBase::Connection>>
TwoPartyVatNetwork::acceptConnectionAsRefHost() {
if (side == rpc::twoparty::Side::SERVER && !accepted) {
accepted = true;
return asConnection();
} else {
// Create a promise that will never be fulfilled.
auto paf = kj::newPromiseAndFulfiller<kj::Own<TwoPartyVatNetworkBase::Connection>>();
acceptFulfiller = kj::mv(paf.fulfiller);
return kj::mv(paf.promise);
}
}
class TwoPartyVatNetwork::OutgoingMessageImpl final
: public OutgoingRpcMessage, public kj::Refcounted {
public:
OutgoingMessageImpl(TwoPartyVatNetwork& network, uint firstSegmentWordSize)
: network(network),
message(firstSegmentWordSize == 0 ? SUGGESTED_FIRST_SEGMENT_WORDS : firstSegmentWordSize) {}
AnyPointer::Builder getBody() override {
return message.getRoot<AnyPointer>();
}
kj::ArrayPtr<kj::Maybe<kj::Own<ClientHook>>> getCapTable() override {
return message.getCapTable();
}
void send() override {
network.previousWrite = network.previousWrite.then([&]() {
// Note that if the write fails, all further writes will be skipped due to the exception.
// We never actually handle this exception because we assume the read end will fail as well
// and it's cleaner to handle the failure there.
return writeMessage(network.stream, message);
}).attach(kj::addRef(*this))
// Note that it's important that the eagerlyEvaluate() come *after* the attach() because
// otherwise the message (and any capabilities in it) will not be released until a new
// message is written! (Kenton once spent all afternoon tracking this down...)
.eagerlyEvaluate(nullptr);
}
private:
TwoPartyVatNetwork& network;
MallocMessageBuilder message;
};
class TwoPartyVatNetwork::IncomingMessageImpl final: public IncomingRpcMessage {
public:
IncomingMessageImpl(kj::Own<MessageReader> message): message(kj::mv(message)) {}
AnyPointer::Reader getBody() override {
return message->getRoot<AnyPointer>();
}
void initCapTable(kj::Array<kj::Maybe<kj::Own<ClientHook>>>&& capTable) override {
message->initCapTable(kj::mv(capTable));
}
private:
kj::Own<MessageReader> message;
};
kj::Own<OutgoingRpcMessage> TwoPartyVatNetwork::newOutgoingMessage(uint firstSegmentWordSize) {
return kj::refcounted<OutgoingMessageImpl>(*this, firstSegmentWordSize);
}
kj::Promise<kj::Maybe<kj::Own<IncomingRpcMessage>>> TwoPartyVatNetwork::receiveIncomingMessage() {
return kj::evalLater([&]() {
return tryReadMessage(stream, receiveOptions)
.then([&](kj::Maybe<kj::Own<MessageReader>>&& message)
-> kj::Maybe<kj::Own<IncomingRpcMessage>> {
KJ_IF_MAYBE(m, message) {
return kj::Own<IncomingRpcMessage>(kj::heap<IncomingMessageImpl>(kj::mv(*m)));
} else {
return nullptr;
}
});
});
}
void TwoPartyVatNetwork::introduceTo(TwoPartyVatNetworkBase::Connection& recipient,
rpc::twoparty::ThirdPartyCapId::Builder sendToRecipient,
rpc::twoparty::RecipientId::Builder sendToTarget) {
KJ_FAIL_REQUIRE("Three-party introductions should never occur on two-party network.");
}
TwoPartyVatNetworkBase::ConnectionAndProvisionId TwoPartyVatNetwork::connectToIntroduced(
rpc::twoparty::ThirdPartyCapId::Reader capId) {
KJ_FAIL_REQUIRE("Three-party introductions should never occur on two-party network.");
}
kj::Own<TwoPartyVatNetworkBase::Connection> TwoPartyVatNetwork::acceptIntroducedConnection(
rpc::twoparty::RecipientId::Reader recipientId) {
KJ_FAIL_REQUIRE("Three-party introductions should never occur on two-party network.");
}
} // namespace capnp