util

package
v1.1.0-beta.0...-d02d48a Latest Latest
Warning

This package is not in the latest version of its module.

 Go to latest Published: Nov 26, 2024 License: Apache-2.0 Imports: 66 Imported by: 0

Documentation

Index

Constants

View Source 
const (

	// NewSessionDefaultRetryCnt is the default retry times when create new session.
	NewSessionDefaultRetryCnt = 3
	// NewSessionRetryUnlimited is the unlimited retry times when create new session.
	NewSessionRetryUnlimited = math.MaxInt64
)
View Source 
const (
	// DefaultMaxRetries indicates the max retry count.
	DefaultMaxRetries = 30
	// RetryInterval indicates retry interval.
	RetryInterval uint64 = 500
)
View Source 
const (
	// Country is type name for country.
	Country = "C"
	// Organization is type name for organization.
	Organization = "O"
	// OrganizationalUnit is type name for organizational unit.
	OrganizationalUnit = "OU"
	// Locality is type name for locality.
	Locality = "L"
	// Email is type name for email.
	Email = "emailAddress"
	// CommonName is type name for common name.
	CommonName = "CN"
	// Province is type name for province or state.
	Province = "ST"
)
View Source 
const (
	// URI indicates uri info in SAN.
	URI = SANType("URI")
	// DNS indicates dns info in SAN.
	DNS = SANType("DNS")
	// IP indicates ip info in SAN.
	IP = SANType("IP")
)
View Source 
const (
	// SyntaxErrorPrefix is the common prefix for SQL syntax error in TiDB.
	SyntaxErrorPrefix = "You have an error in your SQL syntax; check the manual that corresponds to your TiDB version for the right syntax to use"
)

Variables

View Source 
var (
	// InformationSchemaName is the `INFORMATION_SCHEMA` database name.
	InformationSchemaName = pmodel.NewCIStr("INFORMATION_SCHEMA")
	// PerformanceSchemaName is the `PERFORMANCE_SCHEMA` database name.
	PerformanceSchemaName = pmodel.NewCIStr("PERFORMANCE_SCHEMA")
	// MetricSchemaName is the `METRICS_SCHEMA` database name.
	MetricSchemaName = pmodel.NewCIStr("METRICS_SCHEMA")
	// ClusterTableInstanceColumnName is the `INSTANCE` column name of the cluster table.
	ClusterTableInstanceColumnName = "INSTANCE"
)
View Source 
var (
	Version   = "None"
	BuildTS   = "None"
	GitHash   = "None"
	GitBranch = "None"
)

Version information.

View Source 
var GetSequenceByName func(is infoschema.MetaOnlyInfoSchema, schema, sequence pmodel.CIStr) (SequenceTable, error)

GetSequenceByName could be used in expression package without import cycle problem.

View Source 
var SupportCipher = make(map[string]struct{}, len(tlsCipherString))

SupportCipher maintains cipher supported by TiDB.

Functions

func CheckSupportX509NameOneline 

func CheckSupportX509NameOneline(oneline string) (err error)

CheckSupportX509NameOneline parses and validate input str is X509_NAME_oneline format and precheck check-item is supported by TiDB https://www.openssl.org/docs/manmaster/man3/X509_NAME_oneline.html

func ClientWithTLS 

func ClientWithTLS(tlsCfg *tls.Config) *http.Client

ClientWithTLS creates a http client wit tls

func ColumnToProto 

func ColumnToProto(c *model.ColumnInfo, forIndex bool, isTiFlashStore bool) *tipb.ColumnInfo

ColumnToProto converts model.ColumnInfo to tipb.ColumnInfo.

func ColumnsToProto 

func ColumnsToProto(columns []*model.ColumnInfo, pkIsHandle bool, forIndex bool, isTiFlashStore bool) []*tipb.ColumnInfo

ColumnsToProto converts a slice of model.ColumnInfo to a slice of tipb.ColumnInfo.

func ComposeURL 

func ComposeURL(address, path string) string

ComposeURL adds HTTP schema if missing and concats address with path

func CreateCertificates 

func CreateCertificates(certpath string, keypath string, rsaKeySize int, pubKeyAlgo x509.PublicKeyAlgorithm,
	signAlgo x509.SignatureAlgorithm) error

CreateCertificates creates and writes a cert based on the params.

func DelKeyWithPrefix 

func DelKeyWithPrefix(rm kv.RetrieverMutator, prefix kv.Key) error

DelKeyWithPrefix deletes keys with prefix.

func FmtNonASCIIPrintableCharToHex 

func FmtNonASCIIPrintableCharToHex(str string) string

FmtNonASCIIPrintableCharToHex turns non-printable-ASCII characters into Hex

func FormatLeaseID 

func FormatLeaseID(id clientv3.LeaseID) string

FormatLeaseID formats lease id to hex string as what etcdctl does. see https://github.com/etcd-io/etcd/blob/995027f5c1363404e86f7a858ea2833df01f0954/etcdctl/ctlv3/command/printer_simple.go#L118

func GenLogFields 

func GenLogFields(costTime time.Duration, info *ProcessInfo, needTruncateSQL bool) []zap.Field

GenLogFields generate log fields.

func GenRLimit 

func GenRLimit(source string) uint64

GenRLimit get RLIMIT_NOFILE limit

func GetCPUPercentage 

func GetCPUPercentage() float64

GetCPUPercentage calculates CPU usage and returns percentage in float64(e.g. 2.5 means 2.5%). http://man7.org/linux/man-pages/man2/getrusage.2.html

func GetGOGC 

func GetGOGC() int

GetGOGC returns the current value of GOGC.

func GetJSON 

func GetJSON(client *http.Client, url string, v any) error

GetJSON fetches a page and parses it as JSON. The parsed result will be stored into the `v`. The variable `v` must be a pointer to a type that can be unmarshalled from JSON.

Example: 

client := &http.Client{}
var resp struct { IP string }
if err := util.GetJSON(client, "http://api.ipify.org/?format=json", &resp); err != nil {
	return errors.Trace(err)
}
fmt.Println(resp.IP)

nolint:unused

func GetLocalIP 

func GetLocalIP() string

GetLocalIP will return a local IP(non-loopback, non 0.0.0.0), if there is one

func GetRawInfo 

func GetRawInfo(app string) string

GetRawInfo do what its name tells nolint:unused

func GetRecoverError 

func GetRecoverError(r any) error

GetRecoverError gets the error from recover.

func HasCancelled 

func HasCancelled(ctx context.Context) (cancel bool)

HasCancelled checks whether context has be cancelled.

func InternalHTTPClient 

func InternalHTTPClient() *http.Client

InternalHTTPClient is used by TiDB-Server to request other components.

func InternalHTTPSchema 

func InternalHTTPSchema() string

InternalHTTPSchema specifies use http or https to request other components.

func IsInCorrectIdentifierName 

func IsInCorrectIdentifierName(name string) bool

IsInCorrectIdentifierName checks if the identifier is incorrect. See https://dev.mysql.com/doc/refman/5.7/en/identifiers.html

func IsMemDB 

func IsMemDB(dbLowerName string) bool

IsMemDB checks whether dbLowerName is memory database.

func IsMemOrSysDB 

func IsMemOrSysDB(dbLowerName string) bool

IsMemOrSysDB uses to check whether dbLowerName is memory database or system database.

func IsSysDB 

func IsSysDB(dbLowerName string) bool

IsSysDB checks whether dbLowerName is system database.

func IsSystemView 

func IsSystemView(dbLowerName string) bool

IsSystemView is similar to IsMemOrSyDB, but does not include the mysql schema

func LoadTLSCertificates 

func LoadTLSCertificates(ca, key, cert string, autoTLS bool, rsaKeySize int) (tlsConfig *tls.Config, autoReload bool, err error)

LoadTLSCertificates loads CA/KEY/CERT for special paths.

func MockPkixAttribute 

func MockPkixAttribute(name, value string) pkix.AttributeTypeAndValue

MockPkixAttribute generates mock AttributeTypeAndValue. only used for test.

func NewSession 

func NewSession(ctx context.Context, logPrefix string, etcdCli *clientv3.Client, retryCnt, ttl int) (*concurrency.Session, error)

NewSession creates a new etcd session.

func NewTCPConnWithIOCounter 

func NewTCPConnWithIOCounter(conn *net.TCPConn, c *atomic.Uint64) net.Conn

NewTCPConnWithIOCounter creates a new TCPConnWithIOCounter.

func NewTLSConfig 

func NewTLSConfig(opts ...TLSConfigOption) (*tls.Config, error)

NewTLSConfig creates a tls.Config from the given options. If no certificate is provided, it will return (nil, nil).

func OriginError 

func OriginError(err error) error

OriginError return original err

func ParseAndCheckSAN 

func ParseAndCheckSAN(san string) (map[SANType][]string, error)

ParseAndCheckSAN parses and check SAN str.

func ParseHostPortAddr 

func ParseHostPortAddr(s string) ([]string, error)

ParseHostPortAddr returns a scheme://host:port or host:port list

func PrintInfo 

func PrintInfo(app string)

PrintInfo prints the app's basic information in log nolint:unused

func PrintableASCII 

func PrintableASCII(b byte) bool

PrintableASCII detects if b is a printable ASCII character. Ref to:http://facweb.cs.depaul.edu/sjost/it212/documents/ascii-pr.htm

func ReadLine 

func ReadLine(reader *bufio.Reader, maxLineSize int) ([]byte, error)

ReadLine tries to read a complete line from bufio.Reader. maxLineSize specifies the maximum size of a single line.

func ReadLines 

func ReadLines(reader *bufio.Reader, count int, maxLineSize int) ([][]byte, error)

ReadLines tries to read lines from bufio.Reader. count specifies the number of lines. maxLineSize specifies the maximum size of a single line.

func Recover 

func Recover(metricsLabel, funcInfo string, recoverFn func(), quit bool)

Recover includes operations such as recovering, clearing，and printing information. It will dump current goroutine stack into log if catch any recover result. 

metricsLabel: The label of PanicCounter metrics.
funcInfo:     Some information for the panic function.
recoverFn:    Handler will be called after recover and before dump stack, passing `nil` means noop.
quit:         If this value is true, the current program exits after recovery.

func RowKeyPrefixFilter 

func RowKeyPrefixFilter(rowKeyPrefix kv.Key) kv.FnKeyCmp

RowKeyPrefixFilter returns a function which checks whether currentKey has decoded rowKeyPrefix as prefix.

func RunWithRetry 

func RunWithRetry(retryCnt int, backoff uint64, f func() (bool, error)) (err error)

RunWithRetry will run the f with backoff and retry. retryCnt: Max retry count backoff: When run f failed, it will sleep backoff * triedCount time.Millisecond. Function f should have two return value. The first one is an bool which indicate if the err if retryable. The second is if the f meet any error.

func ScanMetaWithPrefix 

func ScanMetaWithPrefix(retriever kv.Retriever, prefix kv.Key, filter func(kv.Key, []byte) bool) error

ScanMetaWithPrefix scans metadata with the prefix.

func SetGOGC 

func SetGOGC(val int) int

SetGOGC update GOGC and related metrics.

func SliceToMap 

func SliceToMap(slice []string) map[string]any

SliceToMap converts slice to map nolint:unused

func Str2Int64Map 

func Str2Int64Map(str string) map[int64]struct{}

Str2Int64Map converts a string to a map[int64]struct{}.

func StringsToInterfaces 

func StringsToInterfaces(strs []string) []any

StringsToInterfaces converts string slice to interface slice

func SyntaxError 

func SyntaxError(err error) error

SyntaxError converts parser error to TiDB's syntax error.

func SyntaxWarn 

func SyntaxWarn(err error) error

SyntaxWarn converts parser warn to TiDB's syntax warn.

func TLSCipher2String 

func TLSCipher2String(n uint16) string

TLSCipher2String convert tls num to string. Taken from https://testssl.sh/openssl-rfc.mapping.html .

func ToTLSConfig 

func ToTLSConfig(caPath, certPath, keyPath string) (*tls.Config, error)

ToTLSConfig generates tls's config.

func ToTLSConfigWithVerify 

func ToTLSConfigWithVerify(caPath, certPath, keyPath string, verifyCN []string) (*tls.Config, error)

ToTLSConfigWithVerify constructs a `*tls.Config` from the CA, certification and key paths, and add verify for CN.

If the CA path is empty, returns nil.

func WithRecovery 

func WithRecovery(exec func(), recoverFn func(r any))

WithRecovery wraps goroutine startup call with force recovery. it will dump current goroutine stack into log if catch any recover result. 

exec:      execute logic function.
recoverFn: handler will be called after recover and before dump stack, passing `nil` means noop.

func X509NameOnline 

func X509NameOnline(n pkix.Name) string

X509NameOnline prints pkix.Name into old X509_NAME_oneline format. https://www.openssl.org/docs/manmaster/man3/X509_NAME_oneline.html

Types

type ErrorGroupWithRecover 

type ErrorGroupWithRecover struct {
	*errgroup.Group
}

ErrorGroupWithRecover will recover panic from error group. Please note that panic will break the control flow unexpectedly, even if we recover it some key logic may be skipped due to panic, for example, Mutex.Unlock(), and continue running may cause unexpected behaviour. Use it with caution.

func NewErrorGroupWithRecover 

func NewErrorGroupWithRecover() *ErrorGroupWithRecover

NewErrorGroupWithRecover creates a ErrorGroupWithRecover.

func NewErrorGroupWithRecoverWithCtx 

func NewErrorGroupWithRecoverWithCtx(ctx context.Context) (*ErrorGroupWithRecover, context.Context)

NewErrorGroupWithRecoverWithCtx is like errgroup.WithContext, but returns a ErrorGroupWithRecover.

func (*ErrorGroupWithRecover) Go 

func (g *ErrorGroupWithRecover) Go(fn func() error)

Go is like errgroup.Group.Go, but convert panic and its stack into error.

type IDGenerator 

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

IDGenerator util class used for generate auto-increasing id

func (*IDGenerator) GetNextID 

func (g *IDGenerator) GetNextID() int

GetNextID return the id++

type OOMAlarmVariablesInfo 

type OOMAlarmVariablesInfo struct {
	SessionAnalyzeVersion         int
	SessionEnabledRateLimitAction bool
	SessionMemQuotaQuery          int64
}

OOMAlarmVariablesInfo is a struct for OOM alarm variables.

type ProcessInfo 

type ProcessInfo struct {
	Time                time.Time
	ExpensiveLogTime    time.Time
	ExpensiveTxnLogTime time.Time
	CurTxnCreateTime    time.Time
	Plan                any
	CursorTracker       cursor.Tracker
	StmtCtx             *stmtctx.StatementContext
	// SQLCPUUsage should be set nil for sleep command
	SQLCPUUsage           *ppcpuusage.SQLCPUUsages
	RefCountOfStmtCtx     *stmtctx.ReferenceCount
	MemTracker            *memory.Tracker
	DiskTracker           *disk.Tracker
	RunawayChecker        resourcegroup.RunawayChecker
	StatsInfo             func(any) map[string]uint64
	RuntimeStatsColl      *execdetails.RuntimeStatsColl
	User                  string
	Digest                string
	Host                  string
	DB                    string
	Info                  string
	Port                  string
	ResourceGroupName     string
	SessionAlias          string
	RedactSQL             string
	IndexNames            []string
	TableIDs              []int64
	PlanExplainRows       [][]string
	OOMAlarmVariablesInfo OOMAlarmVariablesInfo
	ID                    uint64
	CurTxnStartTS         uint64
	// MaxExecutionTime is the timeout for select statement, in milliseconds.
	// If the query takes too long, kill it.
	MaxExecutionTime uint64
	State            uint16
	Command          byte
}

ProcessInfo is a struct used for show processlist statement.

func (*ProcessInfo) Clone 

func (pi *ProcessInfo) Clone() *ProcessInfo

Clone return a shallow clone copy of this processInfo.

func (*ProcessInfo) String 

func (pi *ProcessInfo) String() string

func (*ProcessInfo) ToRow 

func (pi *ProcessInfo) ToRow(tz *time.Location) []any

ToRow returns []interface{} for the row data of "SELECT * FROM INFORMATION_SCHEMA.PROCESSLIST".

func (*ProcessInfo) ToRowForShow 

func (pi *ProcessInfo) ToRowForShow(full bool) []any

ToRowForShow returns []interface{} for the row data of "SHOW [FULL] PROCESSLIST".

type SANType 

type SANType string

SANType is enum value for GlobalPrivValue.SANs keys.

type SequenceTable 

type SequenceTable interface {
	GetSequenceID() int64
	GetSequenceNextVal(ctx any, dbName, seqName string) (int64, error)
	SetSequenceVal(ctx any, newVal int64, dbName, seqName string) (int64, bool, error)
}

SequenceTable is implemented by tableCommon, and it is specialised in handling sequence operation. Otherwise calling table will cause import cycle problem.

type SessionManager 

type SessionManager interface {
	ShowProcessList() map[uint64]*ProcessInfo
	ShowTxnList() []*txninfo.TxnInfo
	GetProcessInfo(id uint64) (*ProcessInfo, bool)
	Kill(connectionID uint64, query bool, maxExecutionTime bool, runaway bool)
	KillAllConnections()
	UpdateTLSConfig(cfg *tls.Config)
	ServerID() uint64
	// StoreInternalSession puts the internal session pointer to the map in the SessionManager.
	StoreInternalSession(se any)
	// DeleteInternalSession deletes the internal session pointer from the map in the SessionManager.
	DeleteInternalSession(se any)
	// GetInternalSessionStartTSList gets all startTS of every transactions running in the current internal sessions.
	GetInternalSessionStartTSList() []uint64
	// CheckOldRunningTxn checks if there is an old transaction running in the current sessions
	CheckOldRunningTxn(job2ver map[int64]int64, job2ids map[int64]string)
	// KillNonFlashbackClusterConn kill all non flashback cluster connections.
	KillNonFlashbackClusterConn()
	// GetConAttrs gets the connection attributes
	GetConAttrs(user *auth.UserIdentity) map[uint64]map[string]string
}

SessionManager is an interface for session manage. Show processlist and kill statement rely on this interface.

type SessionPool 

type SessionPool interface {
	Get() (pools.Resource, error)
	Put(pools.Resource)
	Close()
}

SessionPool is a recyclable resource pool for the session.

func NewSessionPool 

func NewSessionPool(capacity int, factory pools.Factory, getCallback, putCallback resourceCallback) SessionPool

NewSessionPool creates a new session pool with the given capacity and factory function.

type TCPConnWithIOCounter 

type TCPConnWithIOCounter struct {
	*net.TCPConn
	// contains filtered or unexported fields
}

TCPConnWithIOCounter is a wrapper of net.TCPConn with counter that accumulates the bytes this connection reads/writes.

func (*TCPConnWithIOCounter) Read 

func (t *TCPConnWithIOCounter) Read(b []byte) (n int, err error)

func (*TCPConnWithIOCounter) Write 

func (t *TCPConnWithIOCounter) Write(b []byte) (n int, err error)

type TLS 

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

TLS saves some information about tls

func NewTLS 

func NewTLS(caPath, certPath, keyPath, host string, verifyCN []string) (*TLS, error)

NewTLS constructs a new HTTP client with TLS configured with the CA, certificate and key paths.

If the CA path is empty, returns an instance where TLS is disabled.

func (*TLS) WrapListener 

func (tc *TLS) WrapListener(l net.Listener) net.Listener

WrapListener places a TLS layer on top of the existing listener.

type TLSConfigOption 

type TLSConfigOption func(*tlsConfigBuilder)

TLSConfigOption is used to build a tls.Config in NewTLSConfig.

func WithCAContent 

func WithCAContent(caContent []byte) TLSConfigOption

WithCAContent sets the CA content to build a tls.Config, and the peer should use the certificate which can be verified by this CA. It has lower priority than WithCAPath. empty `caContent` is no-op.

func WithCAPath 

func WithCAPath(caPath string) TLSConfigOption

WithCAPath sets the CA path to build a tls.Config, and the peer should use the certificate which can be verified by this CA. It has higher priority than WithCAContent. empty `caPath` is no-op.

func WithCertAndKeyContent 

func WithCertAndKeyContent(certContent, keyContent []byte) TLSConfigOption

WithCertAndKeyContent sets the client certificate and primary key content to build a tls.Config. It has lower priority than WithCertAndKeyPath. empty `certContent`/`keyContent` is no-op.

func WithCertAndKeyPath 

func WithCertAndKeyPath(certPath, keyPath string) TLSConfigOption

WithCertAndKeyPath sets the client certificate and primary key path to build a tls.Config. It has higher priority than WithCertAndKeyContent. empty `certPath`/`keyPath` is no-op. WithCertAndKeyPath also support rotation, which means if the client certificate or primary key file is changed, the new content will be used.

func WithMinTLSVersion 

func WithMinTLSVersion(minTLSVersion uint16) TLSConfigOption

WithMinTLSVersion sets the min tls version to build a tls.Config.

func WithVerifyCommonName 

func WithVerifyCommonName(verifyCN []string) TLSConfigOption

WithVerifyCommonName sets the Common Name the peer must provide before starting a TLS connection. empty `verifyCN` is no-op.

type Token 

type Token struct {
}

Token is used as a permission to keep on running.

type TokenLimiter 

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

TokenLimiter is used to limit the number of concurrent tasks.

func NewTokenLimiter 

func NewTokenLimiter(count uint) *TokenLimiter

NewTokenLimiter creates a TokenLimiter with count tokens.

func (*TokenLimiter) Get 

func (tl *TokenLimiter) Get() *Token

Get obtains a token.

func (*TokenLimiter) Put 

func (tl *TokenLimiter) Put(tk *Token)

Put releases the token.

type WaitGroupEnhancedWrapper 

type WaitGroupEnhancedWrapper struct {
	sync.WaitGroup
	// contains filtered or unexported fields
}

WaitGroupEnhancedWrapper wrapper wg, it provides the basic ability of WaitGroupWrapper with checking unexited process if the `exited` signal is true by print them on log.

func NewWaitGroupEnhancedWrapper 

func NewWaitGroupEnhancedWrapper(source string, exit chan struct{}, exitedCheck bool) *WaitGroupEnhancedWrapper

NewWaitGroupEnhancedWrapper returns WaitGroupEnhancedWrapper, the empty source indicates the unit test, then the `checkUnExitedProcess` won't be executed.

func (*WaitGroupEnhancedWrapper) Run 

func (w *WaitGroupEnhancedWrapper) Run(exec func(), label string)

Run runs a function in a goroutine, adds 1 to WaitGroup and calls done when function returns. Please DO NOT use panic in the cb function. Note that the registered label shouldn't be duplicated.

func (*WaitGroupEnhancedWrapper) RunWithRecover 

func (w *WaitGroupEnhancedWrapper) RunWithRecover(exec func(), recoverFn func(r any), label string)

RunWithRecover wraps goroutine startup call with force recovery, add 1 to WaitGroup and call done when function return. exec is that execute logic function. recoverFn is that handler will be called after recover and before dump stack, passing `nil` means noop. Note that the registered label shouldn't be duplicated.

type WaitGroupPool 

type WaitGroupPool struct {
	sync.WaitGroup
	// contains filtered or unexported fields
}

WaitGroupPool is a wrapper for sync.WaitGroup and support goroutine pool

func NewWaitGroupPool 

func NewWaitGroupPool(gp *gp.Pool) *WaitGroupPool

NewWaitGroupPool returns WaitGroupPool

func (*WaitGroupPool) Run 

func (w *WaitGroupPool) Run(exec func())

Run runs a function in a goroutine, adds 1 to WaitGroup and calls done when function returns. Please DO NOT use panic in the cb function.

type WaitGroupWrapper 

type WaitGroupWrapper struct {
	sync.WaitGroup
}

WaitGroupWrapper is a wrapper for sync.WaitGroup

func (*WaitGroupWrapper) Run 

func (w *WaitGroupWrapper) Run(exec func())

Run runs a function in a goroutine, adds 1 to WaitGroup and calls done when function returns. Please DO NOT use panic in the cb function.

func (*WaitGroupWrapper) RunWithLog 

func (w *WaitGroupWrapper) RunWithLog(exec func())

RunWithLog works like Run, but it also logs on panic.

func (*WaitGroupWrapper) RunWithRecover 

func (w *WaitGroupWrapper) RunWithRecover(exec func(), recoverFn func(r any))

RunWithRecover wraps goroutine startup call with force recovery, add 1 to WaitGroup and call done when function return. it will dump current goroutine stack into log if catch any recover result. exec is that execute logic function. recoverFn is that handler will be called after recover and before dump stack, passing `nil` means noop.

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 func())

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 func(uint64))

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.

Source Files

View all Source files

Directories

Path Synopsis
ucadata
ucadata/generator
ucaimpl
testutil
exeerrors
plannererrors
dbutiltest
Package dbutiltest is a package for some common used methods for db related testing.
 Package dbutiltest is a package for some common used methods for db related testing.
linter
constructor
consistency
Package mock is just for test only.
 Package mock is just for test only.
context
mock
Package mock is a generated GoMock package.
 Package mock is a generated GoMock package.
v2
sys
linux
storage
collector
collector/mock
reporter
reporter/metrics
reporter/mock
state
stmtstats

Jump to

Keyboard shortcuts

? : This menu
/ : Search site
f or F : Jump to
y or Y : Canonical URL
go.dev uses cookies from Google to deliver and enhance the quality of its services and to analyze traffic. Learn more.