[woah] Remove deadline filter (#36477)
Also begin to eliminate `CallContext` in favor of just exposing `Call` - ultimately there's not really a need to introduce two types here, so I'm going to wind that idea back over a few PRs.
I've avoided making this an experiment as the changes required were quite structural.
Closes #36477
COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/36477 from ctiller:deadline-time 9856eeebe6
PiperOrigin-RevId: 629599230
pull/36492/head
Craig Tiller
11 months ago
committed by
Copybara-Service
parent
a0bee78a28
commit
e614dafd89
32 changed files with 356 additions and 872 deletions
@ -1,408 +0,0 @@ |
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//
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// Copyright 2016 gRPC authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#include <grpc/support/port_platform.h> |
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#include "src/core/ext/filters/deadline/deadline_filter.h" |
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#include <functional> |
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#include <memory> |
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#include <new> |
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#include <utility> |
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#include "absl/status/status.h" |
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#include "absl/types/optional.h" |
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#include <grpc/impl/channel_arg_names.h> |
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#include <grpc/status.h> |
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#include <grpc/support/log.h> |
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#include "src/core/lib/config/core_configuration.h" |
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#include "src/core/lib/gprpp/debug_location.h" |
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#include "src/core/lib/gprpp/status_helper.h" |
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#include "src/core/lib/iomgr/error.h" |
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#include "src/core/lib/iomgr/exec_ctx.h" |
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#include "src/core/lib/iomgr/timer.h" |
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#include "src/core/lib/promise/arena_promise.h" |
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#include "src/core/lib/promise/context.h" |
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#include "src/core/lib/surface/call.h" |
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#include "src/core/lib/surface/channel_stack_type.h" |
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#include "src/core/lib/transport/metadata_batch.h" |
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namespace grpc_core { |
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// A fire-and-forget class representing a pending deadline timer.
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// Allocated on the call arena.
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class TimerState { |
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public: |
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TimerState(grpc_deadline_state* deadline_state, Timestamp deadline) |
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: deadline_state_(deadline_state) { |
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GRPC_CALL_STACK_REF(deadline_state->call_stack, "DeadlineTimerState"); |
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GRPC_CLOSURE_INIT(&closure_, TimerCallback, this, nullptr); |
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grpc_timer_init(&timer_, deadline, &closure_); |
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} |
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void Cancel() { grpc_timer_cancel(&timer_); } |
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private: |
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// The on_complete callback used when sending a cancel_error batch down the
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// filter stack. Yields the call combiner when the batch returns.
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static void YieldCallCombiner(void* arg, grpc_error_handle /*ignored*/) { |
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TimerState* self = static_cast<TimerState*>(arg); |
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GRPC_CALL_COMBINER_STOP(self->deadline_state_->call_combiner, |
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"got on_complete from cancel_stream batch"); |
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GRPC_CALL_STACK_UNREF(self->deadline_state_->call_stack, |
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"DeadlineTimerState"); |
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} |
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// This is called via the call combiner, so access to deadline_state is
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// synchronized.
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static void SendCancelOpInCallCombiner(void* arg, grpc_error_handle error) { |
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TimerState* self = static_cast<TimerState*>(arg); |
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grpc_transport_stream_op_batch* batch = grpc_make_transport_stream_op( |
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GRPC_CLOSURE_INIT(&self->closure_, YieldCallCombiner, self, nullptr)); |
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batch->cancel_stream = true; |
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batch->payload->cancel_stream.cancel_error = error; |
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grpc_call_element* elem = self->deadline_state_->elem; |
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elem->filter->start_transport_stream_op_batch(elem, batch); |
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} |
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// Timer callback.
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static void TimerCallback(void* arg, grpc_error_handle error) { |
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TimerState* self = static_cast<TimerState*>(arg); |
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if (error != absl::CancelledError()) { |
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error = grpc_error_set_int(GRPC_ERROR_CREATE("Deadline Exceeded"), |
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StatusIntProperty::kRpcStatus, |
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GRPC_STATUS_DEADLINE_EXCEEDED); |
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self->deadline_state_->call_combiner->Cancel(error); |
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GRPC_CLOSURE_INIT(&self->closure_, SendCancelOpInCallCombiner, self, |
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nullptr); |
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GRPC_CALL_COMBINER_START(self->deadline_state_->call_combiner, |
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&self->closure_, error, |
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"deadline exceeded -- sending cancel_stream op"); |
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} else { |
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GRPC_CALL_STACK_UNREF(self->deadline_state_->call_stack, |
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"DeadlineTimerState"); |
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} |
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} |
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// NOTE: This object's dtor is never called, so do not add any data
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// members that require destruction!
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// TODO(roth): We should ideally call this object's dtor somewhere,
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// but that would require adding more synchronization, because we'd
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// need to call the dtor only after both (a) the timer callback
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// finishes and (b) the filter sees the call completion and attempts
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// to cancel the timer.
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grpc_deadline_state* deadline_state_; |
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grpc_timer timer_; |
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grpc_closure closure_; |
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}; |
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} // namespace grpc_core
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//
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// grpc_deadline_state
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//
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// Starts the deadline timer.
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// This is called via the call combiner, so access to deadline_state is
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// synchronized.
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static void start_timer_if_needed(grpc_deadline_state* deadline_state, |
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grpc_core::Timestamp deadline) { |
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if (deadline == grpc_core::Timestamp::InfFuture()) return; |
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GPR_ASSERT(deadline_state->timer_state == nullptr); |
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deadline_state->timer_state = |
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deadline_state->arena->New<grpc_core::TimerState>(deadline_state, |
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deadline); |
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} |
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// Cancels the deadline timer.
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// This is called via the call combiner, so access to deadline_state is
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// synchronized.
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static void cancel_timer_if_needed(grpc_deadline_state* deadline_state) { |
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if (deadline_state->timer_state != nullptr) { |
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deadline_state->timer_state->Cancel(); |
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deadline_state->timer_state = nullptr; |
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} |
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} |
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// Callback run when we receive trailing metadata.
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static void recv_trailing_metadata_ready(void* arg, grpc_error_handle error) { |
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grpc_deadline_state* deadline_state = static_cast<grpc_deadline_state*>(arg); |
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cancel_timer_if_needed(deadline_state); |
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// Invoke the original callback.
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grpc_core::Closure::Run(DEBUG_LOCATION, |
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deadline_state->original_recv_trailing_metadata_ready, |
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error); |
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} |
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// Inject our own recv_trailing_metadata_ready callback into op.
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static void inject_recv_trailing_metadata_ready( |
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grpc_deadline_state* deadline_state, grpc_transport_stream_op_batch* op) { |
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deadline_state->original_recv_trailing_metadata_ready = |
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op->payload->recv_trailing_metadata.recv_trailing_metadata_ready; |
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GRPC_CLOSURE_INIT(&deadline_state->recv_trailing_metadata_ready, |
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recv_trailing_metadata_ready, deadline_state, |
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grpc_schedule_on_exec_ctx); |
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op->payload->recv_trailing_metadata.recv_trailing_metadata_ready = |
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&deadline_state->recv_trailing_metadata_ready; |
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} |
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// Callback and associated state for starting the timer after call stack
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// initialization has been completed.
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struct start_timer_after_init_state { |
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start_timer_after_init_state(grpc_deadline_state* deadline_state, |
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grpc_core::Timestamp deadline) |
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: deadline_state(deadline_state), deadline(deadline) {} |
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~start_timer_after_init_state() { |
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start_timer_if_needed(deadline_state, deadline); |
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} |
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bool in_call_combiner = false; |
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grpc_deadline_state* deadline_state; |
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grpc_core::Timestamp deadline; |
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grpc_closure closure; |
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}; |
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static void start_timer_after_init(void* arg, grpc_error_handle error) { |
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struct start_timer_after_init_state* state = |
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static_cast<struct start_timer_after_init_state*>(arg); |
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grpc_deadline_state* deadline_state = state->deadline_state; |
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if (!state->in_call_combiner) { |
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// We are initially called without holding the call combiner, so we
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// need to bounce ourselves into it.
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state->in_call_combiner = true; |
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GRPC_CALL_COMBINER_START(deadline_state->call_combiner, &state->closure, |
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error, "scheduling deadline timer"); |
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return; |
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} |
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delete state; |
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GRPC_CALL_COMBINER_STOP(deadline_state->call_combiner, |
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"done scheduling deadline timer"); |
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} |
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grpc_deadline_state::grpc_deadline_state(grpc_call_element* elem, |
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const grpc_call_element_args& args, |
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grpc_core::Timestamp deadline) |
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: elem(elem), |
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call_stack(args.call_stack), |
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call_combiner(args.call_combiner), |
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arena(args.arena) { |
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// Deadline will always be infinite on servers, so the timer will only be
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// set on clients with a finite deadline.
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if (deadline != grpc_core::Timestamp::InfFuture()) { |
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// When the deadline passes, we indicate the failure by sending down
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// an op with cancel_error set. However, we can't send down any ops
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// until after the call stack is fully initialized. If we start the
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// timer here, we have no guarantee that the timer won't pop before
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// call stack initialization is finished. To avoid that problem, we
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// create a closure to start the timer, and we schedule that closure
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// to be run after call stack initialization is done.
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struct start_timer_after_init_state* state = |
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new start_timer_after_init_state(this, deadline); |
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GRPC_CLOSURE_INIT(&state->closure, start_timer_after_init, state, |
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grpc_schedule_on_exec_ctx); |
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grpc_core::ExecCtx::Run(DEBUG_LOCATION, &state->closure, absl::OkStatus()); |
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} |
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} |
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grpc_deadline_state::~grpc_deadline_state() { cancel_timer_if_needed(this); } |
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void grpc_deadline_state_reset(grpc_deadline_state* deadline_state, |
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grpc_core::Timestamp new_deadline) { |
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cancel_timer_if_needed(deadline_state); |
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start_timer_if_needed(deadline_state, new_deadline); |
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} |
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void grpc_deadline_state_client_start_transport_stream_op_batch( |
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grpc_deadline_state* deadline_state, grpc_transport_stream_op_batch* op) { |
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if (op->cancel_stream) { |
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cancel_timer_if_needed(deadline_state); |
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} else { |
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// Make sure we know when the call is complete, so that we can cancel
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// the timer.
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if (op->recv_trailing_metadata) { |
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inject_recv_trailing_metadata_ready(deadline_state, op); |
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} |
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} |
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} |
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//
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// filter code
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//
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// Constructor for channel_data. Used for both client and server filters.
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static grpc_error_handle deadline_init_channel_elem( |
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grpc_channel_element* /*elem*/, grpc_channel_element_args* args) { |
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GPR_ASSERT(!args->is_last); |
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return absl::OkStatus(); |
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} |
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// Destructor for channel_data. Used for both client and server filters.
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static void deadline_destroy_channel_elem(grpc_channel_element* /*elem*/) {} |
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// Additional call data used only for the server filter.
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struct server_call_data { |
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grpc_deadline_state deadline_state; // Must be first.
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// The closure for receiving initial metadata.
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grpc_closure recv_initial_metadata_ready; |
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// Received initial metadata batch.
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grpc_metadata_batch* recv_initial_metadata; |
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// The original recv_initial_metadata_ready closure, which we chain to
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// after our own closure is invoked.
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grpc_closure* next_recv_initial_metadata_ready; |
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}; |
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// Constructor for call_data. Used for both client and server filters.
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static grpc_error_handle deadline_init_call_elem( |
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grpc_call_element* elem, const grpc_call_element_args* args) { |
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new (elem->call_data) grpc_deadline_state(elem, *args, args->deadline); |
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return absl::OkStatus(); |
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} |
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// Destructor for call_data. Used for both client and server filters.
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static void deadline_destroy_call_elem( |
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grpc_call_element* elem, const grpc_call_final_info* /*final_info*/, |
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grpc_closure* /*ignored*/) { |
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grpc_deadline_state* deadline_state = |
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static_cast<grpc_deadline_state*>(elem->call_data); |
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deadline_state->~grpc_deadline_state(); |
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} |
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// Method for starting a call op for client filter.
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static void deadline_client_start_transport_stream_op_batch( |
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grpc_call_element* elem, grpc_transport_stream_op_batch* op) { |
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grpc_deadline_state_client_start_transport_stream_op_batch( |
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static_cast<grpc_deadline_state*>(elem->call_data), op); |
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// Chain to next filter.
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grpc_call_next_op(elem, op); |
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} |
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// Callback for receiving initial metadata on the server.
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static void recv_initial_metadata_ready(void* arg, grpc_error_handle error) { |
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grpc_call_element* elem = static_cast<grpc_call_element*>(arg); |
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server_call_data* calld = static_cast<server_call_data*>(elem->call_data); |
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start_timer_if_needed( |
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&calld->deadline_state, |
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calld->recv_initial_metadata->get(grpc_core::GrpcTimeoutMetadata()) |
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.value_or(grpc_core::Timestamp::InfFuture())); |
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// Invoke the next callback.
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grpc_core::Closure::Run(DEBUG_LOCATION, |
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calld->next_recv_initial_metadata_ready, error); |
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} |
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// Method for starting a call op for server filter.
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static void deadline_server_start_transport_stream_op_batch( |
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grpc_call_element* elem, grpc_transport_stream_op_batch* op) { |
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server_call_data* calld = static_cast<server_call_data*>(elem->call_data); |
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if (op->cancel_stream) { |
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cancel_timer_if_needed(&calld->deadline_state); |
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} else { |
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// If we're receiving initial metadata, we need to get the deadline
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// from the recv_initial_metadata_ready callback. So we inject our
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// own callback into that hook.
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if (op->recv_initial_metadata) { |
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calld->next_recv_initial_metadata_ready = |
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op->payload->recv_initial_metadata.recv_initial_metadata_ready; |
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calld->recv_initial_metadata = |
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op->payload->recv_initial_metadata.recv_initial_metadata; |
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GRPC_CLOSURE_INIT(&calld->recv_initial_metadata_ready, |
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recv_initial_metadata_ready, elem, |
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grpc_schedule_on_exec_ctx); |
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op->payload->recv_initial_metadata.recv_initial_metadata_ready = |
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&calld->recv_initial_metadata_ready; |
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} |
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// Make sure we know when the call is complete, so that we can cancel
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// the timer.
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// Note that we trigger this on recv_trailing_metadata, even though
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// the client never sends trailing metadata, because this is the
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// hook that tells us when the call is complete on the server side.
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if (op->recv_trailing_metadata) { |
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inject_recv_trailing_metadata_ready(&calld->deadline_state, op); |
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} |
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} |
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// Chain to next filter.
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grpc_call_next_op(elem, op); |
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} |
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const grpc_channel_filter grpc_client_deadline_filter = { |
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deadline_client_start_transport_stream_op_batch, |
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[](grpc_channel_element*, grpc_core::CallArgs call_args, |
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grpc_core::NextPromiseFactory next_promise_factory) { |
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return next_promise_factory(std::move(call_args)); |
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}, |
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/* init_call: */ nullptr, |
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grpc_channel_next_op, |
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sizeof(grpc_deadline_state), |
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deadline_init_call_elem, |
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grpc_call_stack_ignore_set_pollset_or_pollset_set, |
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deadline_destroy_call_elem, |
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0, // sizeof(channel_data)
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deadline_init_channel_elem, |
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grpc_channel_stack_no_post_init, |
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deadline_destroy_channel_elem, |
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grpc_channel_next_get_info, |
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"deadline", |
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}; |
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const grpc_channel_filter grpc_server_deadline_filter = { |
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deadline_server_start_transport_stream_op_batch, |
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[](grpc_channel_element*, grpc_core::CallArgs call_args, |
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grpc_core::NextPromiseFactory next_promise_factory) { |
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auto deadline = call_args.client_initial_metadata->get( |
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grpc_core::GrpcTimeoutMetadata()); |
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if (deadline.has_value()) { |
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grpc_core::GetContext<grpc_core::CallContext>()->UpdateDeadline( |
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*deadline); |
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} |
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return next_promise_factory(std::move(call_args)); |
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}, |
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[](grpc_channel_element*, grpc_core::CallSpineInterface* spine) { |
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grpc_core::DownCast<grpc_core::PipeBasedCallSpine*>(spine) |
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->client_initial_metadata() |
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.receiver.InterceptAndMap([](grpc_core::ClientMetadataHandle md) { |
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auto deadline = md->get(grpc_core::GrpcTimeoutMetadata()); |
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if (deadline.has_value()) { |
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grpc_core::GetContext<grpc_core::CallContext>()->UpdateDeadline( |
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*deadline); |
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} |
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return md; |
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}); |
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}, |
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grpc_channel_next_op, |
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sizeof(server_call_data), |
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deadline_init_call_elem, |
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grpc_call_stack_ignore_set_pollset_or_pollset_set, |
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deadline_destroy_call_elem, |
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0, // sizeof(channel_data)
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deadline_init_channel_elem, |
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grpc_channel_stack_no_post_init, |
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deadline_destroy_channel_elem, |
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grpc_channel_next_get_info, |
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"deadline", |
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}; |
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namespace grpc_core { |
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void RegisterDeadlineFilter(CoreConfiguration::Builder* builder) { |
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builder->channel_init() |
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->RegisterFilter(GRPC_CLIENT_DIRECT_CHANNEL, &grpc_client_deadline_filter) |
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.ExcludeFromMinimalStack() |
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.IfChannelArg(GRPC_ARG_ENABLE_DEADLINE_CHECKS, true); |
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builder->channel_init() |
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->RegisterFilter(GRPC_SERVER_CHANNEL, &grpc_server_deadline_filter) |
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.ExcludeFromMinimalStack() |
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.IfChannelArg(GRPC_ARG_ENABLE_DEADLINE_CHECKS, true); |
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} |
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} // namespace grpc_core
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@ -1,85 +0,0 @@ |
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//
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// Copyright 2016 gRPC authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
|
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// you may not use this file except in compliance with the License.
|
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// You may obtain a copy of the License at
|
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//
|
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// http://www.apache.org/licenses/LICENSE-2.0
|
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//
|
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// Unless required by applicable law or agreed to in writing, software
|
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// distributed under the License is distributed on an "AS IS" BASIS,
|
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
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// See the License for the specific language governing permissions and
|
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// limitations under the License.
|
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//
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#ifndef GRPC_SRC_CORE_EXT_FILTERS_DEADLINE_DEADLINE_FILTER_H |
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#define GRPC_SRC_CORE_EXT_FILTERS_DEADLINE_DEADLINE_FILTER_H |
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#include <grpc/support/port_platform.h> |
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#include "src/core/lib/channel/channel_fwd.h" |
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#include "src/core/lib/channel/channel_stack.h" |
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#include "src/core/lib/gprpp/time.h" |
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#include "src/core/lib/iomgr/call_combiner.h" |
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#include "src/core/lib/iomgr/closure.h" |
||||
#include "src/core/lib/resource_quota/arena.h" |
||||
#include "src/core/lib/transport/transport.h" |
||||
|
||||
namespace grpc_core { |
||||
class TimerState; |
||||
} // namespace grpc_core
|
||||
|
||||
// State used for filters that enforce call deadlines.
|
||||
// Must be the first field in the filter's call_data.
|
||||
struct grpc_deadline_state { |
||||
grpc_deadline_state(grpc_call_element* elem, |
||||
const grpc_call_element_args& args, |
||||
grpc_core::Timestamp deadline); |
||||
~grpc_deadline_state(); |
||||
|
||||
// We take a reference to the call stack for the timer callback.
|
||||
grpc_call_element* elem; |
||||
grpc_call_stack* call_stack; |
||||
grpc_core::CallCombiner* call_combiner; |
||||
grpc_core::Arena* arena; |
||||
grpc_core::TimerState* timer_state = nullptr; |
||||
// Closure to invoke when we receive trailing metadata.
|
||||
// We use this to cancel the timer.
|
||||
grpc_closure recv_trailing_metadata_ready; |
||||
// The original recv_trailing_metadata_ready closure, which we chain to
|
||||
// after our own closure is invoked.
|
||||
grpc_closure* original_recv_trailing_metadata_ready; |
||||
}; |
||||
|
||||
// Cancels the existing timer and starts a new one with new_deadline.
|
||||
//
|
||||
// Note: It is generally safe to call this with an earlier deadline
|
||||
// value than the current one, but not the reverse. No checks are done
|
||||
// to ensure that the timer callback is not invoked while it is in the
|
||||
// process of being reset, which means that attempting to increase the
|
||||
// deadline may result in the timer being called twice.
|
||||
//
|
||||
// Note: Must be called while holding the call combiner.
|
||||
void grpc_deadline_state_reset(grpc_deadline_state* deadline_state, |
||||
grpc_core::Timestamp new_deadline); |
||||
|
||||
// To be called from the client-side filter's start_transport_stream_op_batch()
|
||||
// method. Ensures that the deadline timer is cancelled when the call
|
||||
// is completed.
|
||||
//
|
||||
// Note: It is the caller's responsibility to chain to the next filter if
|
||||
// necessary after this function returns.
|
||||
//
|
||||
// Note: Must be called while holding the call combiner.
|
||||
void grpc_deadline_state_client_start_transport_stream_op_batch( |
||||
grpc_deadline_state* deadline_state, grpc_transport_stream_op_batch* op); |
||||
|
||||
// Deadline filters for direct client channels and server channels.
|
||||
// Note: Deadlines for non-direct client channels are handled by the
|
||||
// client_channel filter.
|
||||
extern const grpc_channel_filter grpc_client_deadline_filter; |
||||
extern const grpc_channel_filter grpc_server_deadline_filter; |
||||
|
||||
#endif // GRPC_SRC_CORE_EXT_FILTERS_DEADLINE_DEADLINE_FILTER_H
|
||||
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Reference in new issue