utils

package
v0.0.0-...-503c688 Latest Latest
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 Go to latest Published: Nov 8, 2023 License: Apache-2.0, Apache-2.0 Imports: 59 Imported by: 0

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Index

Constants

View Source 
const (

	// region heartbeat are 10 seconds by default, if some region has 2 heartbeat missing (15 seconds), it appear to be a network issue between PD and TiKV.
	FlashbackRetryTime       = 3
	FlashbackWaitInterval    = 3 * time.Second
	FlashbackMaxWaitInterval = 15 * time.Second

	ChecksumRetryTime       = 8
	ChecksumWaitInterval    = 1 * time.Second
	ChecksumMaxWaitInterval = 30 * time.Second
)
View Source 
const (
	CDCPrefix      = "/tidb/cdc/"
	ChangefeedPath = "/changefeed/info/"
	CDCPrefixV61   = "/tidb/cdc/changefeed/info/"
)
View Source 
const (
	RegisterImportTaskPrefix = "/tidb/brie/import"

	RegisterRetryInternal = 10 * time.Second
)

The key format should be {RegisterImportTaskPrefix}/{RegisterTaskType}/{taskName}

View Source 
const (

	// DefaultBRGCSafePointTTL means PD keep safePoint limit at least 5min.
	DefaultBRGCSafePointTTL = 5 * 60
	// DefaultCheckpointGCSafePointTTL means PD keep safePoint limit at least 72 minutes.
	DefaultCheckpointGCSafePointTTL = 72 * 60
	// DefaultStreamStartSafePointTTL specifies keeping the server safepoint 30 mins when start task.
	DefaultStreamStartSafePointTTL = 1800
	// DefaultStreamPauseSafePointTTL specifies Keeping the server safePoint at list 24h when pause task.
	DefaultStreamPauseSafePointTTL = 24 * 3600
)
View Source 
const DefaultGcRatioVal = "1.1"

Variables

This section is empty.

Functions

func ArchiveSize 

func ArchiveSize(meta *backuppb.BackupMeta) uint64

ArchiveSize returns the total size of the backup archive.

func CheckGCSafePoint 

func CheckGCSafePoint(ctx context.Context, pdClient pd.Client, ts uint64) error

CheckGCSafePoint checks whether the ts is older than GC safepoint. Note: It ignores errors other than exceed GC safepoint.

func CheckLogBackupEnabled 

func CheckLogBackupEnabled(ctx sessionctx.Context) bool

CheckLogBackupEnabled checks if LogBackup is enabled in cluster. this mainly used in three places. 1. GC worker resolve locks to scan more locks after safepoint. (every minute) 2. Add index skipping use lightning.(every add index ddl) 3. Telemetry of log backup feature usage (every 6 hours). NOTE: this result shouldn't be cached by caller. because it may change every time in one cluster.

func CheckLogBackupTaskExist 

func CheckLogBackupTaskExist() bool

CheckLogBackupTaskExist checks that whether log-backup is existed.

func CheckStoreLiveness 

func CheckStoreLiveness(s *metapb.Store) error

CheckStoreLiveness checks whether a store is still alive. Some versions of PD may not set the store state in the gRPC response. We need to check it manually.

func CloneSlice 

func CloneSlice[T any](s []T) []T

CloneSlice sallowly clones a slice.

func CompareBytesExt 

func CompareBytesExt(a []byte, aEmptyAsInf bool, b []byte, bEmptyAsInf bool) int

CompareBytesExt compare two byte sequences. different from `bytes.Compare`, we can provide whether to treat the key as inf when meet empty key to this.

func CompareEndKey 

func CompareEndKey(a, b []byte) int

CompareEndKey compared two keys that BOTH represent the EXCLUSIVE ending of some range. An empty end key is the very end, so an empty key is greater than any other keys. Please note that this function is not applicable if any one argument is not an EXCLUSIVE ending of a range.

func EncloseDBAndTable 

func EncloseDBAndTable(database, table string) string

EncloseDBAndTable formats the database and table name in sql.

func EncloseName 

func EncloseName(name string) string

EncloseName formats name in sql.

func FallBack2CreateTable 

func FallBack2CreateTable(err error) bool

func GRPCConn 

func GRPCConn(ctx context.Context, storeAddr string, tlsConf *tls.Config, opts ...grpc.DialOption) (*grpc.ClientConn, error)

func GetGcRatio 

func GetGcRatio(ctx sqlexec.RestrictedSQLExecutor) (string, error)

func GetRegionSplitInfo 

func GetRegionSplitInfo(ctx sqlexec.RestrictedSQLExecutor) (uint64, int64)

func GetSplitKeys 

func GetSplitKeys(ctx sqlexec.RestrictedSQLExecutor) int64

func GetSplitSize 

func GetSplitSize(ctx sqlexec.RestrictedSQLExecutor) uint64

func GetSysDBCIStrName 

func GetSysDBCIStrName(tempDB model.CIStr) (model.CIStr, bool)

GetSysDBCIStrName get the CIStr name of system DB

func GetSysDBName 

func GetSysDBName(tempDB model.CIStr) (string, bool)

GetSysDBName get the original name of system DB

func GetTidbNewCollationEnabled 

func GetTidbNewCollationEnabled() string

GetTidbNewCollationEnabled returns the variable name of NewCollationEnabled.

func HideSensitive 

func HideSensitive(input string) string

HideSensitive replace password with ******.

func IntersectAll 

func IntersectAll(s1 []kv.KeyRange, s2 []kv.KeyRange) []kv.KeyRange

IntersectAll returns the intersect of two set of segments. OWNERSHIP INFORMATION: For running faster, this function would MUTATE the input slice. (i.e. takes its ownership.) (But it is promised that this function won't change the `start key` and `end key` slice) If you want to use the input slice after, call `CloneSlice` over arguments before passing them.

You can treat "set of segments" as points maybe not adjacent. in this way, IntersectAll(s1, s2) = { point | point in both s1 and s2 } Example: ranges: |___________| |________________| toClampIn: |_____| |____| |________________| result: |_____| |_| |______________| we are assuming the arguments are sorted by the start key and no overlaps. you can call spans.Collapse to get key ranges fits this requirements. Note: this algorithm is pretty like the `checkIntervalIsSubset`, can we get them together?

func IsLogBackupEnabled 

func IsLogBackupEnabled(ctx sqlexec.RestrictedSQLExecutor) (bool, error)

IsLogBackupEnabled is used for br to check whether tikv has enabled log backup. we use `sqlexec.RestrictedSQLExecutor` as parameter because it's easy to mock. it should return error.

func IsLogBackupInUse 

func IsLogBackupInUse(ctx sessionctx.Context) bool

IsLogBackupInUse checks the log backup task existed.

func IsSysDB 

func IsSysDB(dbLowerName string) bool

IsSysDB tests whether the database is system DB. Currently, the only system DB is mysql.

func IsTemplateSysDB 

func IsTemplateSysDB(dbname model.CIStr) bool

IsTemplateSysDB checks wheterh the dbname is temporary system database(__TiDB_BR_Temporary_mysql).

func IsTypeCompatible 

func IsTypeCompatible(src types.FieldType, target types.FieldType) bool

IsTypeCompatible checks whether type target is compatible with type src they're compatible if - same null/not null and unsigned flag(maybe we can allow src not null flag, target null flag later) - have same evaluation type - target's flen and decimal should be bigger or equals to src's - elements in target is superset of elements in src if they're enum or set type - same charset and collate if they're string types

func LoadBackupTables 

func LoadBackupTables(ctx context.Context, reader *metautil.MetaReader) (map[string]*Database, error)

LoadBackupTables loads schemas from BackupMeta.

func LogBackupTaskCountDec 

func LogBackupTaskCountDec()

LogBackupTaskCountDec decreases the count of log backup task.

func LogBackupTaskCountInc 

func LogBackupTaskCountInc()

LogBackupTaskCountInc increases the count of log backup task.

func LogEnvVariables 

func LogEnvVariables()

LogEnvVariables logs related environment variables.

func MakeSafePointID 

func MakeSafePointID() string

MakeSafePointID makes a unique safe point ID, for reduce name conflict.

func MarshalBackupMeta 

func MarshalBackupMeta(meta *backuppb.BackupMeta) ([]byte, error)

MarshalBackupMeta converts the backupmeta strcture to JSON. Unlike json.Marshal, this function also format some []byte fields for human reading.

func MessageIsNotFoundStorageError 

func MessageIsNotFoundStorageError(msg string) bool

MessageIsNotFoundStorageError checks whether the message returning from TiKV is "NotFound" storage I/O error

func MessageIsPermissionDeniedStorageError 

func MessageIsPermissionDeniedStorageError(msg string) bool

MessageIsPermissionDeniedStorageError checks whether the message returning from TiKV is "PermissionDenied" storage I/O error

func MessageIsRetryableStorageError 

func MessageIsRetryableStorageError(msg string) bool

MessageIsRetryableStorageError checks whether the message returning from TiKV is retryable ExternalStorageError.

func NeedAutoID 

func NeedAutoID(tblInfo *model.TableInfo) bool

NeedAutoID checks whether the table needs backing up with an autoid.

func NextPowerOfTwo 

func NextPowerOfTwo(i int64) int64

NextPowerOfTwo returns the smallest power of two greater than or equal to `i` Caller should guarantee that i > 0 and the return value is not overflow.

func PanicToErr 

func PanicToErr(err *error)

PanicToErr recovers when the execution get panicked, and set the error provided by the arg. generally, this would be used with named return value and `defer`, like: 

func foo() (err error) {
  defer utils.PanicToErr(&err)
  return maybePanic()
}

Before using this, there are some hints for reducing resource leakage or bugs:

  • If any of clean work (by `defer`) relies on the error (say, when error happens, rollback some operations.), please place `defer this` AFTER that.
  • All resources allocated should be freed by the `defer` syntax, or when panicking, they may not be recycled.

func ParseKey 

func ParseKey(format, key string) ([]byte, error)

ParseKey parse key by given format.

func SetGcRatio 

func SetGcRatio(ctx sqlexec.RestrictedSQLExecutor, ratio string) error

func StartDynamicPProfListener 

func StartDynamicPProfListener(tls *tidbutils.TLS)

StartDynamicPProfListener starts the listener that will enable pprof when received `startPProfSignal`.

func StartPProfListener 

func StartPProfListener(statusAddr string, wrapper *tidbutils.TLS) error

StartPProfListener forks a new goroutine listening on specified port and provide pprof info.

func StartServiceSafePointKeeper 

func StartServiceSafePointKeeper(
	ctx context.Context,
	pdClient pd.Client,
	sp BRServiceSafePoint,
) error

StartServiceSafePointKeeper will run UpdateServiceSafePoint periodicity hence keeping service safepoint won't lose.

func TemporaryDBName 

func TemporaryDBName(db string) model.CIStr

TemporaryDBName makes a 'private' database name.

func UnmarshalBackupMeta 

func UnmarshalBackupMeta(data []byte) (*backuppb.BackupMeta, error)

UnmarshalBackupMeta converts the prettied JSON format of backupmeta (made by MarshalBackupMeta) back to the go structure.

func UpdateServiceSafePoint 

func UpdateServiceSafePoint(ctx context.Context, pdClient pd.Client, sp BRServiceSafePoint) error

UpdateServiceSafePoint register BackupTS to PD, to lock down BackupTS as safePoint with TTL seconds.

func WithRetry 

func WithRetry(
	ctx context.Context,
	retryableFunc RetryableFunc,
	backoffer Backoffer,
) error

WithRetry retries a given operation with a backoff policy.

Returns nil if `retryableFunc` succeeded at least once. Otherwise, returns a multierr containing all errors encountered.

Types

type BRServiceSafePoint 

type BRServiceSafePoint struct {
	ID       string
	TTL      int64
	BackupTS uint64
}

BRServiceSafePoint is metadata of service safe point from a BR 'instance'.

func (BRServiceSafePoint) MarshalLogObject 

func (sp BRServiceSafePoint) MarshalLogObject(encoder zapcore.ObjectEncoder) error

MarshalLogObject implements zapcore.ObjectMarshaler.

type Backoffer 

type Backoffer interface {
	// NextBackoff returns a duration to wait before retrying again
	NextBackoff(err error) time.Duration
	// Attempt returns the remain attempt times
	Attempt() int
}

Backoffer implements a backoff policy for retrying operations.

func NewBackoffer 

func NewBackoffer(attempt int, delayTime, maxDelayTime time.Duration) Backoffer

NewBackoffer creates a new controller regulating a truncated exponential backoff.

func NewDownloadSSTBackoffer 

func NewDownloadSSTBackoffer() Backoffer

func NewImportSSTBackoffer 

func NewImportSSTBackoffer() Backoffer

func NewPDReqBackoffer 

func NewPDReqBackoffer() Backoffer

func NewPDReqBackofferExt 

func NewPDReqBackofferExt() Backoffer

type CDCNameSet 

type CDCNameSet struct {
	// contains filtered or unexported fields
}

CDCNameSet saves CDC changefeed's information. nameSet maps `cluster/namespace` to `changefeed`s

func GetCDCChangefeedNameSet 

func GetCDCChangefeedNameSet(ctx context.Context, cli *clientv3.Client) (*CDCNameSet, error)

GetCDCChangefeedNameSet gets CDC changefeed information and wraps them to a map for CDC >= v6.2, the etcd key format is /tidb/cdc/<clusterID>/<namespace>/changefeed/info/<changefeedID> for CDC <= v6.1, the etcd key format is /tidb/cdc/changefeed/info/<changefeedID>

func (*CDCNameSet) Empty 

func (s *CDCNameSet) Empty() bool

that the nameSet is empty means no changefeed exists.

func (*CDCNameSet) MessageToUser 

func (s *CDCNameSet) MessageToUser() string

MessageToUser convert the map `nameSet` to a readable message to user.

type DBExecutor 

type DBExecutor interface {
	StmtExecutor
	BeginTx(ctx context.Context, opts *sql.TxOptions) (*sql.Tx, error)
}

DBExecutor is a interface for statements and txn

type Database 

type Database struct {
	Info   *model.DBInfo
	Tables []*metautil.Table
}

Database wraps the schema and tables of a database.

func (*Database) GetTable 

func (db *Database) GetTable(name string) *metautil.Table

GetTable returns a table of the database by name.

type FakePDClient 

type FakePDClient struct {
	pd.Client
	Stores []*metapb.Store
}

func (FakePDClient) GetAllStores 

func (c FakePDClient) GetAllStores(context.Context, ...pd.GetStoreOption) ([]*metapb.Store, error)

GetAllStores return fake stores.

type Pool 

type Pool struct {
	// contains filtered or unexported fields
}

Pool is a lazy pool of gRPC channels. When `Get` called, it lazily allocates new connection if connection not full. If it's full, then it will return allocated channels round-robin.

func NewConnPool 

func NewConnPool(capacity int, newConn func(ctx context.Context) (*grpc.ClientConn, error)) *Pool

NewConnPool creates a new Pool by the specified conn factory function and capacity.

func (*Pool) Close 

func (p *Pool) Close()

Close closes the conn pool.

func (*Pool) Get 

func (p *Pool) Get(ctx context.Context) (*grpc.ClientConn, error)

Get tries to get an existing connection from the pool, or make a new one if the pool not full.

type ProgressPrinter 

type ProgressPrinter struct {
	// contains filtered or unexported fields
}

ProgressPrinter prints a progress bar.

func NewProgressPrinter 

func NewProgressPrinter(
	name string,
	total int64,
	redirectLog bool,
) *ProgressPrinter

NewProgressPrinter returns a new progress printer.

func StartProgress 

func StartProgress(
	ctx context.Context,
	name string,
	total int64,
	redirectLog bool,
	log logFunc,
) *ProgressPrinter

StartProgress starts progress bar.

func (*ProgressPrinter) Close 

func (pp *ProgressPrinter) Close()

Close closes the current progress bar.

func (*ProgressPrinter) GetCurrent 

func (pp *ProgressPrinter) GetCurrent() int64

GetCurrent get the current progress.

func (*ProgressPrinter) Inc 

func (pp *ProgressPrinter) Inc()

Inc increases the current progress bar.

func (*ProgressPrinter) IncBy 

func (pp *ProgressPrinter) IncBy(cnt int64)

IncBy implements glue.Progress

type QueryExecutor 

type QueryExecutor interface {
	QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error)
	QueryRowContext(ctx context.Context, query string, args ...interface{}) *sql.Row
}

QueryExecutor is a interface for exec query

type RegisterTask 

type RegisterTask struct {
	Key     string
	LeaseID int64
	TTL     int64
}

RegisterTask saves the task's information

func (RegisterTask) MessageToUser 

func (task RegisterTask) MessageToUser() string

MessageToUser marshal the task to user message

type RegisterTaskType 

type RegisterTaskType int

RegisterTaskType for the sub-prefix path for key 

const (
	RegisterRestore RegisterTaskType = iota
	RegisterLightning
)

func (RegisterTaskType) String 

func (tp RegisterTaskType) String() string

type RegisterTasksList 

type RegisterTasksList struct {
	Tasks []RegisterTask
}

func GetImportTasksFrom 

func GetImportTasksFrom(ctx context.Context, client *clientv3.Client) (RegisterTasksList, error)

GetImportTasksFrom try to get all the import tasks with prefix `RegisterTaskPrefix`

func (RegisterTasksList) Empty 

func (list RegisterTasksList) Empty() bool

func (RegisterTasksList) MessageToUser 

func (list RegisterTasksList) MessageToUser() string

type RetryState 

type RetryState struct {
	// contains filtered or unexported fields
}

RetryState is the mutable state needed for retrying. It likes the `utils.Backoffer`, but more fundamental: this only control the backoff time and knows nothing about what error happens. NOTE: Maybe also implement the backoffer via this.

func InitialRetryState 

func InitialRetryState(maxRetryTimes int, initialBackoff, maxBackoff time.Duration) RetryState

InitialRetryState make the initial state for retrying.

func (*RetryState) Attempt 

func (rs *RetryState) Attempt() int

Attempt implements the `Backoffer`. TODO: Maybe use this to replace the `exponentialBackoffer` (which is nearly homomorphic to this)?

func (*RetryState) ExponentialBackoff 

func (rs *RetryState) ExponentialBackoff() time.Duration

Get the exponential backoff durion and transform the state.

func (*RetryState) NextBackoff 

func (rs *RetryState) NextBackoff(error) time.Duration

NextBackoff implements the `Backoffer`.

func (*RetryState) RecordRetry 

func (rs *RetryState) RecordRetry()

RecordRetry simply record retry times, and no backoff

func (*RetryState) ReduceRetry 

func (rs *RetryState) ReduceRetry()

ReduceRetry reduces retry times for 1.

func (*RetryState) RetryTimes 

func (rs *RetryState) RetryTimes() int

RetryTimes returns the retry times. usage: unit test.

func (*RetryState) ShouldRetry 

func (rs *RetryState) ShouldRetry() bool

Whether in the current state we can retry.

func (*RetryState) StopRetry 

func (rs *RetryState) StopRetry()

type RetryWithBackoffer 

type RetryWithBackoffer struct {
	// contains filtered or unexported fields
}

RetryWithBackoffer is a simple context for a "mixed" retry. Some of TiDB APIs, say, `ResolveLock` requires a `tikv.Backoffer` as argument. But the `tikv.Backoffer` isn't pretty customizable, it has some sorts of predefined configuration but we cannot create new one. So we are going to mix up the flavour of `tikv.Backoffer` and our homemade back off strategy. That is what the `RetryWithBackoffer` did.

func AdaptTiKVBackoffer 

func AdaptTiKVBackoffer(ctx context.Context, maxSleepMs int, baseErr error) *RetryWithBackoffer

AdaptTiKVBackoffer creates an "ad-hoc" backoffer, which wraps a backoffer and provides some new functions: When backing off, we can manually provide it a specified sleep duration instead of directly provide a retry.Config Which is sealed in the "client-go/internal".

func (*RetryWithBackoffer) BackOff 

func (r *RetryWithBackoffer) BackOff() error

BackOff executes the back off: sleep for a precalculated backoff time. See `RequestBackOff` for more details.

func (*RetryWithBackoffer) Inner 

func (r *RetryWithBackoffer) Inner() *tikv.Backoffer

Inner returns the reference to the inner `backoffer`.

func (*RetryWithBackoffer) MaxSleepInMS 

func (r *RetryWithBackoffer) MaxSleepInMS() int

MaxSleepInMS returns the max sleep time for the retry context in ms.

func (*RetryWithBackoffer) NextSleepInMS 

func (r *RetryWithBackoffer) NextSleepInMS() int

NextSleepInMS returns the time `BackOff` will sleep in ms of the state.

func (*RetryWithBackoffer) RequestBackOff 

func (r *RetryWithBackoffer) RequestBackOff(ms int)

RequestBackOff register the intent of backing off at least n milliseconds. That intent will be fulfilled when calling `BackOff`.

func (*RetryWithBackoffer) TotalSleepInMS 

func (r *RetryWithBackoffer) TotalSleepInMS() int

TotalSleepInMS returns the total sleeped time in ms.

type RetryableFunc 

type RetryableFunc func() error

RetryableFunc presents a retryable operation.

type StmtExecutor 

type StmtExecutor interface {
	QueryExecutor
	ExecContext(ctx context.Context, query string, args ...interface{}) (sql.Result, error)
}

StmtExecutor define both query and exec methods

type StoreManager 

type StoreManager struct {
	// contains filtered or unexported fields
}

func NewStoreManager 

func NewStoreManager(pdCli pd.Client, kl keepalive.ClientParameters, tlsConf *tls.Config) *StoreManager

NewStoreManager create a new manager for gRPC connections to stores.

func (*StoreManager) Close 

func (mgr *StoreManager) Close()

Close closes all client in Mgr.

func (*StoreManager) GetKeepalive 

func (mgr *StoreManager) GetKeepalive() keepalive.ClientParameters

func (*StoreManager) PDClient 

func (mgr *StoreManager) PDClient() pd.Client

func (*StoreManager) ResetBackupClient 

func (mgr *StoreManager) ResetBackupClient(ctx context.Context, storeID uint64) (backuppb.BackupClient, error)

ResetBackupClient reset the connection for backup client.

func (*StoreManager) TLSConfig 

func (mgr *StoreManager) TLSConfig() *tls.Config

func (*StoreManager) WithConn 

func (mgr *StoreManager) WithConn(ctx context.Context, storeID uint64, f func(*grpc.ClientConn)) error

type TaskRegister 

type TaskRegister struct {
	// contains filtered or unexported fields
}

TaskRegister can register the task to PD with a lease, and keepalive it in the background

func NewTaskRegister 

func NewTaskRegister(client *clientv3.Client, tp RegisterTaskType, taskName string) *TaskRegister

NewTaskRegister build a TaskRegister with key format {RegisterTaskPrefix}/{RegisterTaskType}/{taskName}

func NewTaskRegisterWithTTL 

func NewTaskRegisterWithTTL(client *clientv3.Client, ttl time.Duration, tp RegisterTaskType, taskName string) *TaskRegister

NewTaskRegisterWithTTL build a TaskRegister with key format {RegisterTaskPrefix}/{RegisterTaskType}/{taskName}

func (*TaskRegister) Close 

func (tr *TaskRegister) Close(ctx context.Context) (err error)

Close closes the background task of taskRegister

func (*TaskRegister) RegisterTask 

func (tr *TaskRegister) RegisterTask(c context.Context) error

RegisterTask firstly put its key to PD with a lease, and start to keepalive the lease in the background.

type Worker 

type Worker struct {
	ID uint64
}

Worker identified by ID.

type WorkerPool 

type WorkerPool struct {
	// contains filtered or unexported fields
}

WorkerPool contains a pool of workers.

func NewWorkerPool 

func NewWorkerPool(limit uint, name string) *WorkerPool

NewWorkerPool returns a WorkPool.

func (*WorkerPool) Apply 

func (pool *WorkerPool) Apply(fn taskFunc)

Apply executes a task.

func (*WorkerPool) ApplyOnErrorGroup 

func (pool *WorkerPool) ApplyOnErrorGroup(eg *errgroup.Group, fn func() error)

ApplyOnErrorGroup executes a task in an errorgroup.

func (*WorkerPool) ApplyWithID 

func (pool *WorkerPool) ApplyWithID(fn identifiedTaskFunc)

ApplyWithID execute a task and provides it with the worker ID.

func (*WorkerPool) ApplyWithIDInErrorGroup 

func (pool *WorkerPool) ApplyWithIDInErrorGroup(eg *errgroup.Group, fn func(id uint64) error)

ApplyWithIDInErrorGroup executes a task in an errorgroup and provides it with the worker ID.

func (*WorkerPool) ApplyWorker 

func (pool *WorkerPool) ApplyWorker() *Worker

ApplyWorker apply a worker.

func (*WorkerPool) HasWorker 

func (pool *WorkerPool) HasWorker() bool

HasWorker checks if the pool has unallocated workers.

func (*WorkerPool) IdleCount 

func (pool *WorkerPool) IdleCount() int

IdleCount counts how many idle workers in the pool.

func (*WorkerPool) Limit 

func (pool *WorkerPool) Limit() int

Limit is the limit of the pool

func (*WorkerPool) RecycleWorker 

func (pool *WorkerPool) RecycleWorker(worker *Worker)

RecycleWorker recycle a worker.

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