/
handler.go
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/
handler.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// 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.
package matching
import (
"context"
"sync"
"time"
"github.com/uber/cadence/common"
"github.com/uber/cadence/common/log"
"github.com/uber/cadence/common/metrics"
"github.com/uber/cadence/common/quotas"
"github.com/uber/cadence/common/resource"
"github.com/uber/cadence/common/types"
)
var _ Handler = (*handlerImpl)(nil)
//go:generate mockgen -package $GOPACKAGE -source $GOFILE -destination handler_mock.go -package matching github.com/uber/cadence/service/matching Handler
type (
// Handler interface for matching service
Handler interface {
Health(context.Context) (*types.HealthStatus, error)
AddActivityTask(context.Context, *types.AddActivityTaskRequest) error
AddDecisionTask(context.Context, *types.AddDecisionTaskRequest) error
CancelOutstandingPoll(context.Context, *types.CancelOutstandingPollRequest) error
DescribeTaskList(context.Context, *types.MatchingDescribeTaskListRequest) (*types.DescribeTaskListResponse, error)
ListTaskListPartitions(context.Context, *types.MatchingListTaskListPartitionsRequest) (*types.ListTaskListPartitionsResponse, error)
PollForActivityTask(context.Context, *types.MatchingPollForActivityTaskRequest) (*types.PollForActivityTaskResponse, error)
PollForDecisionTask(context.Context, *types.MatchingPollForDecisionTaskRequest) (*types.MatchingPollForDecisionTaskResponse, error)
QueryWorkflow(context.Context, *types.MatchingQueryWorkflowRequest) (*types.QueryWorkflowResponse, error)
RespondQueryTaskCompleted(context.Context, *types.MatchingRespondQueryTaskCompletedRequest) error
}
// handlerImpl is an implementation for matching service independent of wire protocol
handlerImpl struct {
resource.Resource
engine Engine
config *Config
metricsClient metrics.Client
startWG sync.WaitGroup
rateLimiter quotas.Limiter
}
)
var (
errMatchingHostThrottle = &types.ServiceBusyError{Message: "Matching host rps exceeded"}
)
// NewHandler creates a thrift handler for the history service
func NewHandler(
resource resource.Resource,
config *Config,
) *handlerImpl {
handler := &handlerImpl{
Resource: resource,
config: config,
metricsClient: resource.GetMetricsClient(),
rateLimiter: quotas.NewDynamicRateLimiter(func() float64 {
return float64(config.RPS())
}),
engine: NewEngine(
resource.GetTaskManager(),
resource.GetHistoryClient(),
resource.GetMatchingRawClient(), // Use non retry client inside matching
config,
resource.GetLogger(),
resource.GetMetricsClient(),
resource.GetDomainCache(),
resource.GetMatchingServiceResolver(),
),
}
// prevent us from trying to serve requests before matching engine is started and ready
handler.startWG.Add(1)
return handler
}
// Start starts the handler
func (h *handlerImpl) Start() {
h.startWG.Done()
}
// Stop stops the handler
func (h *handlerImpl) Stop() {
h.engine.Stop()
}
// Health is for health check
func (h *handlerImpl) Health(ctx context.Context) (*types.HealthStatus, error) {
h.startWG.Wait()
h.GetLogger().Debug("Matching service health check endpoint reached.")
hs := &types.HealthStatus{Ok: true, Msg: "matching good"}
return hs, nil
}
func (h *handlerImpl) newHandlerContext(
ctx context.Context,
domainID string,
taskList *types.TaskList,
scope int,
) *handlerContext {
return newHandlerContext(
ctx,
h.domainName(domainID),
taskList,
h.metricsClient,
scope,
h.GetLogger(),
)
}
// AddActivityTask - adds an activity task.
func (h *handlerImpl) AddActivityTask(
ctx context.Context,
request *types.AddActivityTaskRequest,
) (retError error) {
defer log.CapturePanic(h.GetLogger(), &retError)
startT := time.Now()
hCtx := h.newHandlerContext(
ctx,
request.GetDomainUUID(),
request.GetTaskList(),
metrics.MatchingAddActivityTaskScope,
)
sw := hCtx.startProfiling(&h.startWG)
defer sw.Stop()
if request.GetForwardedFrom() != "" {
hCtx.scope.IncCounter(metrics.ForwardedPerTaskListCounter)
}
if ok := h.rateLimiter.Allow(); !ok {
return hCtx.handleErr(errMatchingHostThrottle)
}
syncMatch, err := h.engine.AddActivityTask(hCtx, request)
if syncMatch {
hCtx.scope.RecordTimer(metrics.SyncMatchLatencyPerTaskList, time.Since(startT))
}
return hCtx.handleErr(err)
}
// AddDecisionTask - adds a decision task.
func (h *handlerImpl) AddDecisionTask(
ctx context.Context,
request *types.AddDecisionTaskRequest,
) (retError error) {
defer log.CapturePanic(h.GetLogger(), &retError)
startT := time.Now()
hCtx := h.newHandlerContext(
ctx,
request.GetDomainUUID(),
request.GetTaskList(),
metrics.MatchingAddDecisionTaskScope,
)
sw := hCtx.startProfiling(&h.startWG)
defer sw.Stop()
if request.GetForwardedFrom() != "" {
hCtx.scope.IncCounter(metrics.ForwardedPerTaskListCounter)
}
if ok := h.rateLimiter.Allow(); !ok {
return hCtx.handleErr(errMatchingHostThrottle)
}
syncMatch, err := h.engine.AddDecisionTask(hCtx, request)
if syncMatch {
hCtx.scope.RecordTimer(metrics.SyncMatchLatencyPerTaskList, time.Since(startT))
}
return hCtx.handleErr(err)
}
// PollForActivityTask - long poll for an activity task.
func (h *handlerImpl) PollForActivityTask(
ctx context.Context,
request *types.MatchingPollForActivityTaskRequest,
) (resp *types.PollForActivityTaskResponse, retError error) {
defer log.CapturePanic(h.GetLogger(), &retError)
hCtx := h.newHandlerContext(
ctx,
request.GetDomainUUID(),
request.GetPollRequest().GetTaskList(),
metrics.MatchingPollForActivityTaskScope,
)
sw := hCtx.startProfiling(&h.startWG)
defer sw.Stop()
if request.GetForwardedFrom() != "" {
hCtx.scope.IncCounter(metrics.ForwardedPerTaskListCounter)
}
if ok := h.rateLimiter.Allow(); !ok {
return nil, hCtx.handleErr(errMatchingHostThrottle)
}
if _, err := common.ValidateLongPollContextTimeoutIsSet(
ctx,
"PollForActivityTask",
h.Resource.GetThrottledLogger(),
); err != nil {
return nil, hCtx.handleErr(err)
}
response, err := h.engine.PollForActivityTask(hCtx, request)
return response, hCtx.handleErr(err)
}
// PollForDecisionTask - long poll for a decision task.
func (h *handlerImpl) PollForDecisionTask(
ctx context.Context,
request *types.MatchingPollForDecisionTaskRequest,
) (resp *types.MatchingPollForDecisionTaskResponse, retError error) {
defer log.CapturePanic(h.GetLogger(), &retError)
hCtx := h.newHandlerContext(
ctx,
request.GetDomainUUID(),
request.GetPollRequest().GetTaskList(),
metrics.MatchingPollForDecisionTaskScope,
)
sw := hCtx.startProfiling(&h.startWG)
defer sw.Stop()
if request.GetForwardedFrom() != "" {
hCtx.scope.IncCounter(metrics.ForwardedPerTaskListCounter)
}
if ok := h.rateLimiter.Allow(); !ok {
return nil, hCtx.handleErr(errMatchingHostThrottle)
}
if _, err := common.ValidateLongPollContextTimeoutIsSet(
ctx,
"PollForDecisionTask",
h.Resource.GetThrottledLogger(),
); err != nil {
return nil, hCtx.handleErr(err)
}
response, err := h.engine.PollForDecisionTask(hCtx, request)
return response, hCtx.handleErr(err)
}
// QueryWorkflow queries a given workflow synchronously and return the query result.
func (h *handlerImpl) QueryWorkflow(
ctx context.Context,
request *types.MatchingQueryWorkflowRequest,
) (resp *types.QueryWorkflowResponse, retError error) {
defer log.CapturePanic(h.GetLogger(), &retError)
hCtx := h.newHandlerContext(
ctx,
request.GetDomainUUID(),
request.GetTaskList(),
metrics.MatchingQueryWorkflowScope,
)
sw := hCtx.startProfiling(&h.startWG)
defer sw.Stop()
if request.GetForwardedFrom() != "" {
hCtx.scope.IncCounter(metrics.ForwardedPerTaskListCounter)
}
if ok := h.rateLimiter.Allow(); !ok {
return nil, hCtx.handleErr(errMatchingHostThrottle)
}
response, err := h.engine.QueryWorkflow(hCtx, request)
return response, hCtx.handleErr(err)
}
// RespondQueryTaskCompleted responds a query task completed
func (h *handlerImpl) RespondQueryTaskCompleted(
ctx context.Context,
request *types.MatchingRespondQueryTaskCompletedRequest,
) (retError error) {
defer log.CapturePanic(h.GetLogger(), &retError)
hCtx := h.newHandlerContext(
ctx,
request.GetDomainUUID(),
request.GetTaskList(),
metrics.MatchingRespondQueryTaskCompletedScope,
)
sw := hCtx.startProfiling(&h.startWG)
defer sw.Stop()
// Count the request in the RPS, but we still accept it even if RPS is exceeded
h.rateLimiter.Allow()
err := h.engine.RespondQueryTaskCompleted(hCtx, request)
return hCtx.handleErr(err)
}
// CancelOutstandingPoll is used to cancel outstanding pollers
func (h *handlerImpl) CancelOutstandingPoll(ctx context.Context,
request *types.CancelOutstandingPollRequest) (retError error) {
defer log.CapturePanic(h.GetLogger(), &retError)
hCtx := h.newHandlerContext(
ctx,
request.GetDomainUUID(),
request.GetTaskList(),
metrics.MatchingCancelOutstandingPollScope,
)
sw := hCtx.startProfiling(&h.startWG)
defer sw.Stop()
// Count the request in the RPS, but we still accept it even if RPS is exceeded
h.rateLimiter.Allow()
err := h.engine.CancelOutstandingPoll(hCtx, request)
return hCtx.handleErr(err)
}
// DescribeTaskList returns information about the target tasklist, right now this API returns the
// pollers which polled this tasklist in last few minutes. If includeTaskListStatus field is true,
// it will also return status of tasklist's ackManager (readLevel, ackLevel, backlogCountHint and taskIDBlock).
func (h *handlerImpl) DescribeTaskList(
ctx context.Context,
request *types.MatchingDescribeTaskListRequest,
) (resp *types.DescribeTaskListResponse, retError error) {
defer log.CapturePanic(h.GetLogger(), &retError)
hCtx := h.newHandlerContext(
ctx,
request.GetDomainUUID(),
request.GetDescRequest().GetTaskList(),
metrics.MatchingDescribeTaskListScope,
)
sw := hCtx.startProfiling(&h.startWG)
defer sw.Stop()
if ok := h.rateLimiter.Allow(); !ok {
return nil, hCtx.handleErr(errMatchingHostThrottle)
}
response, err := h.engine.DescribeTaskList(hCtx, request)
return response, hCtx.handleErr(err)
}
// ListTaskListPartitions returns information about partitions for a taskList
func (h *handlerImpl) ListTaskListPartitions(
ctx context.Context,
request *types.MatchingListTaskListPartitionsRequest,
) (resp *types.ListTaskListPartitionsResponse, retError error) {
defer log.CapturePanic(h.GetLogger(), &retError)
hCtx := newHandlerContext(
ctx,
request.GetDomain(),
request.GetTaskList(),
h.metricsClient,
metrics.MatchingListTaskListPartitionsScope,
h.GetLogger(),
)
sw := hCtx.startProfiling(&h.startWG)
defer sw.Stop()
if ok := h.rateLimiter.Allow(); !ok {
return nil, hCtx.handleErr(errMatchingHostThrottle)
}
response, err := h.engine.ListTaskListPartitions(hCtx, request)
return response, hCtx.handleErr(err)
}
func (h *handlerImpl) domainName(id string) string {
domainName, err := h.GetDomainCache().GetDomainName(id)
if err != nil {
return ""
}
return domainName
}