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// Copyright 2021 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <grpc/support/port_platform.h>
#include "src/core/ext/transport/binder/wire_format/wire_writer.h"
#ifndef GRPC_NO_BINDER
#include <utility>
#include <grpc/support/log.h>
#define RETURN_IF_ERROR(expr) \
do { \
const absl::Status status = (expr); \
if (!status.ok()) return status; \
} while (0)
namespace grpc_binder {
WireWriterImpl::WireWriterImpl(std::unique_ptr<Binder> binder)
: binder_(std::move(binder)) {}
absl::Status WireWriterImpl::WriteInitialMetadata(const Transaction& tx,
WritableParcel* parcel) {
if (tx.IsClient()) {
// Only client sends method ref.
RETURN_IF_ERROR(parcel->WriteString(tx.GetMethodRef()));
}
RETURN_IF_ERROR(parcel->WriteInt32(tx.GetPrefixMetadata().size()));
for (const auto& md : tx.GetPrefixMetadata()) {
RETURN_IF_ERROR(parcel->WriteByteArrayWithLength(md.first));
RETURN_IF_ERROR(parcel->WriteByteArrayWithLength(md.second));
}
return absl::OkStatus();
}
absl::Status WireWriterImpl::WriteTrailingMetadata(const Transaction& tx,
WritableParcel* parcel) {
if (tx.IsServer()) {
if (tx.GetFlags() & kFlagStatusDescription) {
RETURN_IF_ERROR(parcel->WriteString(tx.GetStatusDesc()));
}
RETURN_IF_ERROR(parcel->WriteInt32(tx.GetSuffixMetadata().size()));
for (const auto& md : tx.GetSuffixMetadata()) {
RETURN_IF_ERROR(parcel->WriteByteArrayWithLength(md.first));
RETURN_IF_ERROR(parcel->WriteByteArrayWithLength(md.second));
}
} else {
// client suffix currently is always empty according to the wireformat
if (!tx.GetSuffixMetadata().empty()) {
gpr_log(GPR_ERROR, "Got non-empty suffix metadata from client.");
}
}
return absl::OkStatus();
}
const int64_t WireWriterImpl::kBlockSize = 16 * 1024;
const int64_t WireWriterImpl::kFlowControlWindowSize = 128 * 1024;
bool WireWriterImpl::CanBeSentInOneTransaction(const Transaction& tx) const {
return (tx.GetFlags() & kFlagMessageData) == 0 ||
tx.GetMessageData().size() <= kBlockSize;
}
absl::Status WireWriterImpl::RpcCallFastPath(const Transaction& tx) {
int& seq = seq_num_[tx.GetTxCode()];
// Fast path: send data in one transaction.
RETURN_IF_ERROR(binder_->PrepareTransaction());
WritableParcel* parcel = binder_->GetWritableParcel();
RETURN_IF_ERROR(parcel->WriteInt32(tx.GetFlags()));
RETURN_IF_ERROR(parcel->WriteInt32(seq++));
if (tx.GetFlags() & kFlagPrefix) {
RETURN_IF_ERROR(WriteInitialMetadata(tx, parcel));
}
if (tx.GetFlags() & kFlagMessageData) {
RETURN_IF_ERROR(parcel->WriteByteArrayWithLength(tx.GetMessageData()));
}
if (tx.GetFlags() & kFlagSuffix) {
RETURN_IF_ERROR(WriteTrailingMetadata(tx, parcel));
}
// FIXME(waynetu): Construct BinderTransportTxCode from an arbitrary integer
// is an undefined behavior.
return binder_->Transact(BinderTransportTxCode(tx.GetTxCode()));
}
bool WireWriterImpl::WaitForAcknowledgement() {
if (num_outgoing_bytes_ < num_acknowledged_bytes_ + kFlowControlWindowSize) {
return true;
}
absl::Time deadline = absl::Now() + absl::Seconds(1);
do {
if (cv_.WaitWithDeadline(&mu_, deadline)) {
return false;
}
if (absl::Now() >= deadline) {
return false;
}
} while (num_outgoing_bytes_ >=
num_acknowledged_bytes_ + kFlowControlWindowSize);
return true;
}
absl::Status WireWriterImpl::RpcCall(const Transaction& tx) {
// TODO(mingcl): check tx_code <= last call id
grpc_core::MutexLock lock(&mu_);
GPR_ASSERT(tx.GetTxCode() >= kFirstCallId);
if (CanBeSentInOneTransaction(tx)) {
return RpcCallFastPath(tx);
}
// Slow path: the message data is too large to fit in one transaction.
int& seq = seq_num_[tx.GetTxCode()];
int original_flags = tx.GetFlags();
GPR_ASSERT(original_flags & kFlagMessageData);
absl::string_view data = tx.GetMessageData();
size_t bytes_sent = 0;
while (bytes_sent < data.size()) {
if (!WaitForAcknowledgement()) {
return absl::InternalError("Timeout waiting for acknowledgement");
}
RETURN_IF_ERROR(binder_->PrepareTransaction());
WritableParcel* parcel = binder_->GetWritableParcel();
size_t size =
std::min(static_cast<size_t>(kBlockSize), data.size() - bytes_sent);
int flags = kFlagMessageData;
if (bytes_sent == 0) {
// This is the first transaction. Include initial metadata if there's any.
if (original_flags & kFlagPrefix) {
flags |= kFlagPrefix;
}
}
if (bytes_sent + kBlockSize >= data.size()) {
// This is the last transaction. Include trailing metadata if there's any.
if (original_flags & kFlagSuffix) {
flags |= kFlagSuffix;
}
} else {
// There are more messages to send.
flags |= kFlagMessageDataIsPartial;
}
RETURN_IF_ERROR(parcel->WriteInt32(flags));
RETURN_IF_ERROR(parcel->WriteInt32(seq++));
if (flags & kFlagPrefix) {
RETURN_IF_ERROR(WriteInitialMetadata(tx, parcel));
}
RETURN_IF_ERROR(
parcel->WriteByteArrayWithLength(data.substr(bytes_sent, size)));
if (flags & kFlagSuffix) {
RETURN_IF_ERROR(WriteTrailingMetadata(tx, parcel));
}
num_outgoing_bytes_ += parcel->GetDataSize();
RETURN_IF_ERROR(binder_->Transact(BinderTransportTxCode(tx.GetTxCode())));
bytes_sent += size;
}
return absl::OkStatus();
}
absl::Status WireWriterImpl::SendAck(int64_t num_bytes) {
grpc_core::MutexLock lock(&mu_);
RETURN_IF_ERROR(binder_->PrepareTransaction());
WritableParcel* parcel = binder_->GetWritableParcel();
RETURN_IF_ERROR(parcel->WriteInt64(num_bytes));
return binder_->Transact(BinderTransportTxCode::ACKNOWLEDGE_BYTES);
}
void WireWriterImpl::OnAckReceived(int64_t num_bytes) {
grpc_core::MutexLock lock(&mu_);
num_acknowledged_bytes_ = std::max(num_acknowledged_bytes_, num_bytes);
cv_.Signal();
}
} // namespace grpc_binder
#endif
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