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scanner.go
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scanner.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 scanner
import (
"context"
"time"
"github.com/uber-go/tally"
"github.com/uber/cadence/common"
"github.com/uber/cadence/common/backoff"
"github.com/uber/cadence/common/cluster"
"github.com/uber/cadence/common/log"
"github.com/uber/cadence/common/log/tag"
"github.com/uber/cadence/common/metrics"
p "github.com/uber/cadence/common/persistence"
pfactory "github.com/uber/cadence/common/persistence/persistence-factory"
"github.com/uber/cadence/common/service/config"
"github.com/uber/cadence/common/service/dynamicconfig"
"go.uber.org/cadence/.gen/go/cadence/workflowserviceclient"
"go.uber.org/cadence/.gen/go/shared"
cclient "go.uber.org/cadence/client"
"go.uber.org/cadence/worker"
"go.uber.org/zap"
)
type (
// Config defines the configuration for scanner
Config struct {
// PersistenceMaxQPS the max rate of calls to persistence
PersistenceMaxQPS dynamicconfig.IntPropertyFn
// Persistence contains the persistence configuration
Persistence *config.Persistence
// ClusterMetadata contains the metadata for this cluster
ClusterMetadata cluster.Metadata
}
// BootstrapParams contains the set of params needed to bootstrap
// the scanner sub-system
BootstrapParams struct {
// Config contains the configuration for scanner
Config Config
// SDKClient is an instance of cadence sdk client
SDKClient workflowserviceclient.Interface
// MetricsClient is an instance of metrics object for emitting stats
MetricsClient metrics.Client
Logger log.Logger
// TallyScope is an instance of tally metrics scope
TallyScope tally.Scope
}
// scannerContext is the context object that get's
// passed around within the scanner workflows / activities
scannerContext struct {
taskDB p.TaskManager
domainDB p.MetadataManager
cfg Config
sdkClient workflowserviceclient.Interface
metricsClient metrics.Client
tallyScope tally.Scope
logger log.Logger
zapLogger *zap.Logger
}
// Scanner is the background sub-system that does full scans
// of database tables to cleanup resources, monitor anamolies
// and emit stats for analytics
Scanner struct {
context scannerContext
}
)
// New returns a new instance of scanner daemon
// Scanner is the background sub-system that does full
// scans of database tables in an attempt to cleanup
// resources, monitor system anamolies and emit stats
// for analysis and alerting
func New(params *BootstrapParams) *Scanner {
cfg := params.Config
cfg.Persistence.SetMaxQPS(cfg.Persistence.DefaultStore, cfg.PersistenceMaxQPS())
zapLogger, err := zap.NewProduction()
if err != nil {
params.Logger.Fatal("failed to initialize zap logger", tag.Error(err))
}
return &Scanner{
context: scannerContext{
cfg: cfg,
sdkClient: params.SDKClient,
metricsClient: params.MetricsClient,
tallyScope: params.TallyScope,
zapLogger: zapLogger,
logger: params.Logger,
},
}
}
// Start starts the scanner
func (s *Scanner) Start() error {
if err := s.buildContext(); err != nil {
return err
}
workerOpts := worker.Options{
Logger: s.context.zapLogger,
MetricsScope: s.context.tallyScope,
MaxConcurrentActivityExecutionSize: maxConcurrentActivityExecutionSize,
MaxConcurrentDecisionTaskExecutionSize: maxConcurrentDecisionTaskExecutionSize,
BackgroundActivityContext: context.WithValue(context.Background(), scannerContextKey, s.context),
}
go s.startWorkflowWithRetry()
worker := worker.New(s.context.sdkClient, common.SystemDomainName, tlScannerTaskListName, workerOpts)
return worker.Start()
}
func (s *Scanner) startWorkflowWithRetry() error {
client := cclient.NewClient(s.context.sdkClient, common.SystemDomainName, &cclient.Options{})
policy := backoff.NewExponentialRetryPolicy(time.Second)
policy.SetMaximumInterval(time.Minute)
policy.SetExpirationInterval(backoff.NoInterval)
return backoff.Retry(func() error {
return s.startWorkflow(client)
}, policy, func(err error) bool {
return true
})
}
func (s *Scanner) startWorkflow(client cclient.Client) error {
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Minute)
_, err := client.StartWorkflow(ctx, tlScannerWFStartOptions, tlScannerWFTypeName)
cancel()
if err != nil {
if _, ok := err.(*shared.WorkflowExecutionAlreadyStartedError); ok {
return nil
}
s.context.logger.Error("error starting scanner workflow", tag.Error(err))
return err
}
s.context.logger.Info("Scanner workflow successfully started")
return nil
}
func (s *Scanner) buildContext() error {
cfg := &s.context.cfg
pFactory := pfactory.New(cfg.Persistence, cfg.ClusterMetadata.GetCurrentClusterName(), s.context.metricsClient, s.context.logger)
domainDB, err := pFactory.NewMetadataManager(pfactory.MetadataV1V2)
if err != nil {
return err
}
taskDB, err := pFactory.NewTaskManager()
if err != nil {
return err
}
s.context.taskDB = taskDB
s.context.domainDB = domainDB
return nil
}