base

package
v0.0.3-alpha Latest Latest
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 Go to latest Published: Sep 6, 2022 License: Apache-2.0 Imports: 10 Imported by: 0

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Index

Constants

View Source 
const (
	TotalInBoundResourceName = "__total_inbound_traffic__"

	DefaultMaxResourceAmount uint32 = 10000

	DefaultSampleCount uint32 = 2
	DefaultIntervalMs  uint32 = 1000

	// default 10*1000/500 = 20
	DefaultSampleCountTotal uint32 = 20
	// default 10s (total length)
	DefaultIntervalMsTotal uint32 = 10000

	DefaultStatisticMaxRt = int64(60000)
)

global variable

Variables

View Source 
var (
	IllegalGlobalStatisticParamsError = errors.New("Invalid parameters, sampleCount or interval, for resource's global statistic")
	IllegalStatisticParamsError       = errors.New("Invalid parameters, sampleCount or interval, for metric statistic")
	GlobalStatisticNonReusableError   = errors.New("The parameters, sampleCount and interval, mismatch for reusing between resource's global statistic and readonly metric statistic.")
)

Functions

func CheckValidityForReuseStatistic 

func CheckValidityForReuseStatistic(sampleCount, intervalInMs uint32, parentSampleCount, parentIntervalInMs uint32) error

CheckValidityForReuseStatistic checks whether the read-only stat-metric with given attributes (i.e. sampleCount and intervalInMs) can be built based on underlying global statistics data-structure with given attributes (parentSampleCount and parentIntervalInMs). Returns nil if the attributes satisfy the validation, or return specific error if not.

The parameters, sampleCount and intervalInMs, are the attributes of the stat-metric view you want to build. The parameters, parentSampleCount and parentIntervalInMs, are the attributes of the underlying statistics data-structure.

func CheckValidityForStatistic 

func CheckValidityForStatistic(sampleCount, intervalInMs uint32) error

func NopReadStat 

func NopReadStat() *nopReadStat

func NopWriteStat 

func NopWriteStat() *nopWriteStat

func RegistryBlockType 

func RegistryBlockType(blockType BlockType, desc string) error

RegistryBlockType adds block type and corresponding description in order.

Types

type BaseSlot 

type BaseSlot interface {
	// Order returns the sort value of the slot.
	// SlotChain will sort all it's slots by ascending sort value in each bucket
	// (StatPrepareSlot bucket、RuleCheckSlot bucket and StatSlot bucket)
	Order() uint32
}

type BlockError 

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

BlockError indicates the request was blocked by Sentinel.

func NewBlockError 

func NewBlockError(opts ...BlockErrorOption) *BlockError

func NewBlockErrorFromDeepCopy 

func NewBlockErrorFromDeepCopy(from *BlockError) *BlockError

func NewBlockErrorWithCause 

func NewBlockErrorWithCause(blockType BlockType, blockMsg string, rule SentinelRule, snapshot interface{}) *BlockError

func NewBlockErrorWithMessage 

func NewBlockErrorWithMessage(blockType BlockType, message string) *BlockError

func (*BlockError) BlockMsg 

func (e *BlockError) BlockMsg() string

func (*BlockError) BlockType 

func (e *BlockError) BlockType() BlockType

func (*BlockError) Error 

func (e *BlockError) Error() string

func (*BlockError) ResetBlockError 

func (e *BlockError) ResetBlockError(opts ...BlockErrorOption)

func (*BlockError) TriggeredRule 

func (e *BlockError) TriggeredRule() SentinelRule

func (*BlockError) TriggeredValue 

func (e *BlockError) TriggeredValue() interface{}

type BlockErrorOption 

type BlockErrorOption func(*BlockError)

func WithBlockMsg 

func WithBlockMsg(blockMsg string) BlockErrorOption

func WithBlockType 

func WithBlockType(blockType BlockType) BlockErrorOption

func WithRule 

func WithRule(rule SentinelRule) BlockErrorOption

func WithSnapshotValue 

func WithSnapshotValue(snapshotValue interface{}) BlockErrorOption

type BlockType 

type BlockType uint8
const (
	BlockTypeUnknown BlockType = iota
	BlockTypeFlow
	BlockTypeIsolation
	BlockTypeCircuitBreaking
	BlockTypeSystemFlow
	BlockTypeHotSpotParamFlow
)

func (BlockType) String 

func (t BlockType) String() string

type ConcurrencyStat 

type ConcurrencyStat interface {
	CurrentConcurrency() int32
	IncreaseConcurrency()
	DecreaseConcurrency()
}

ConcurrencyStat provides read/update operation for concurrency statistics.

type EntryContext 

type EntryContext struct {
	Resource *ResourceWrapper
	StatNode StatNode

	Input *SentinelInput
	// the result of rule slots check
	RuleCheckResult *TokenResult
	// reserve for storing some intermediate data from the Entry execution process
	Data map[interface{}]interface{}
	// contains filtered or unexported fields
}

func NewEmptyEntryContext 

func NewEmptyEntryContext() *EntryContext

func (*EntryContext) Entry 

func (ctx *EntryContext) Entry() *SentinelEntry

func (*EntryContext) Err 

func (ctx *EntryContext) Err() error

func (*EntryContext) IsBlocked 

func (ctx *EntryContext) IsBlocked() bool

func (*EntryContext) PutRt 

func (ctx *EntryContext) PutRt(rt uint64)

func (*EntryContext) Reset 

func (ctx *EntryContext) Reset()

Reset init EntryContext,

func (*EntryContext) Rt 

func (ctx *EntryContext) Rt() uint64

func (*EntryContext) SetEntry 

func (ctx *EntryContext) SetEntry(entry *SentinelEntry)

func (*EntryContext) SetError 

func (ctx *EntryContext) SetError(err error)

func (*EntryContext) StartTime 

func (ctx *EntryContext) StartTime() uint64

type ExitHandler 

type ExitHandler func(entry *SentinelEntry, ctx *EntryContext) error

type ExitOption 

type ExitOption func(*ExitOptions)

func WithError 

func WithError(err error) ExitOption

type ExitOptions 

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

type MetricEvent 

type MetricEvent int8
const (
	// sentinel rules check pass
	MetricEventPass MetricEvent = iota
	// sentinel rules check block
	MetricEventBlock

	MetricEventComplete
	// Biz error, used for circuit breaker
	MetricEventError
	// request execute rt, unit is millisecond
	MetricEventRt
	// hack for the number of event
	MetricEventTotal
)

There are five events to record pass + block == Total

type MetricItem 

type MetricItem struct {
	Resource       string
	Classification int32
	Timestamp      uint64

	PassQps         uint64
	BlockQps        uint64
	CompleteQps     uint64
	ErrorQps        uint64
	AvgRt           uint64
	OccupiedPassQps uint64
	Concurrency     uint32
}

MetricItem represents the data of metric log per line.

func MetricItemFromFatString 

func MetricItemFromFatString(line string) (*MetricItem, error)

func (*MetricItem) ToFatString 

func (m *MetricItem) ToFatString() (string, error)

func (*MetricItem) ToThinString 

func (m *MetricItem) ToThinString() (string, error)

type MetricItemRetriever 

type MetricItemRetriever interface {
	MetricsOnCondition(predicate TimePredicate) []*MetricItem
}

type ReadStat 

type ReadStat interface {
	GetQPS(event MetricEvent) float64
	GetPreviousQPS(event MetricEvent) float64
	GetSum(event MetricEvent) int64

	MinRT() float64
	AvgRT() float64
}

type ResourceType 

type ResourceType int32

ResourceType represents classification of the resources 

const (
	ResTypeCommon ResourceType = iota
	ResTypeWeb
	ResTypeRPC
	ResTypeAPIGateway
	ResTypeDBSQL
	ResTypeCache
	ResTypeMQ
)

type ResourceWrapper 

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

ResourceWrapper represents the invocation

func NewResourceWrapper 

func NewResourceWrapper(name string, classification ResourceType, flowType TrafficType) *ResourceWrapper

func (*ResourceWrapper) Classification 

func (r *ResourceWrapper) Classification() ResourceType

func (*ResourceWrapper) FlowType 

func (r *ResourceWrapper) FlowType() TrafficType

func (*ResourceWrapper) Name 

func (r *ResourceWrapper) Name() string

func (*ResourceWrapper) String 

func (r *ResourceWrapper) String() string

type RuleCheckSlot 

type RuleCheckSlot interface {
	BaseSlot
	// Check function do some validation
	// It can break off the slot pipeline
	// Each TokenResult will return check result
	// The upper logic will control pipeline according to SlotResult.
	Check(ctx *EntryContext) *TokenResult
}

RuleCheckSlot is rule based checking strategy All checking rule must implement this interface.

type SentinelEntry 

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

func NewSentinelEntry 

func NewSentinelEntry(ctx *EntryContext, rw *ResourceWrapper, sc *SlotChain) *SentinelEntry

func (*SentinelEntry) Context 

func (e *SentinelEntry) Context() *EntryContext

func (*SentinelEntry) Exit 

func (e *SentinelEntry) Exit(exitOps ...ExitOption)

func (*SentinelEntry) Resource 

func (e *SentinelEntry) Resource() *ResourceWrapper

func (*SentinelEntry) SetError 

func (e *SentinelEntry) SetError(err error)

func (*SentinelEntry) WhenExit 

func (e *SentinelEntry) WhenExit(exitHandler ExitHandler)

type SentinelInput 

type SentinelInput struct {
	BatchCount uint32
	Flag       int32
	Args       []interface{}
	// store some values in this context when calling context in slot.
	Attachments map[interface{}]interface{}
}

The input data of sentinel

type SentinelRule 

type SentinelRule interface {
	fmt.Stringer

	ResourceName() string
}

type SlotChain 

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

SlotChain hold all system slots and customized slot. SlotChain support plug-in slots developed by developer.

func NewSlotChain 

func NewSlotChain() *SlotChain

func (*SlotChain) AddRuleCheckSlot 

func (sc *SlotChain) AddRuleCheckSlot(s RuleCheckSlot)

AddRuleCheckSlot adds the RuleCheckSlot to the RuleCheckSlot list of the SlotChain. All RuleCheckSlot in the list will be sorted according to RuleCheckSlot.Order() in ascending order. AddRuleCheckSlot is non-thread safe, In concurrency scenario, AddRuleCheckSlot must be guarded by SlotChain.RWMutex#Lock

func (*SlotChain) AddStatPrepareSlot 

func (sc *SlotChain) AddStatPrepareSlot(s StatPrepareSlot)

AddStatPrepareSlot adds the StatPrepareSlot slot to the StatPrepareSlot list of the SlotChain. All StatPrepareSlot in the list will be sorted according to StatPrepareSlot.Order() in ascending order. AddStatPrepareSlot is non-thread safe, In concurrency scenario, AddStatPrepareSlot must be guarded by SlotChain.RWMutex#Lock

func (*SlotChain) AddStatSlot 

func (sc *SlotChain) AddStatSlot(s StatSlot)

AddStatSlot adds the StatSlot to the StatSlot list of the SlotChain. All StatSlot in the list will be sorted according to StatSlot.Order() in ascending order. AddStatSlot is non-thread safe, In concurrency scenario, AddStatSlot must be guarded by SlotChain.RWMutex#Lock

func (*SlotChain) Entry 

func (sc *SlotChain) Entry(ctx *EntryContext) *TokenResult

The entrance of slot chain Return the TokenResult and nil if internal panic.

func (*SlotChain) GetPooledContext 

func (sc *SlotChain) GetPooledContext() *EntryContext

Get a EntryContext from EntryContext ctxPool, if ctxPool doesn't have enough EntryContext then new one.

func (*SlotChain) RefurbishContext 

func (sc *SlotChain) RefurbishContext(c *EntryContext)

type StatNode 

type StatNode interface {
	MetricItemRetriever

	ReadStat
	WriteStat
	ConcurrencyStat

	// GenerateReadStat generates the readonly metric statistic based on resource level global statistic
	// If parameters, sampleCount and intervalInMs, are not suitable for resource level global statistic, return (nil, error)
	GenerateReadStat(sampleCount uint32, intervalInMs uint32) (ReadStat, error)
}

StatNode holds real-time statistics for resources.

type StatPrepareSlot 

type StatPrepareSlot interface {
	BaseSlot
	// Prepare function do some initialization
	// Such as: init statistic structure、node and etc
	// The result of preparing would store in EntryContext
	// All StatPrepareSlots execute in sequence
	// Prepare function should not throw panic.
	Prepare(ctx *EntryContext)
}

StatPrepareSlot is responsible for some preparation before statistic For example: init structure and so on

type StatSlot 

type StatSlot interface {
	BaseSlot
	// OnEntryPass function will be invoked when StatPrepareSlots and RuleCheckSlots execute pass
	// StatSlots will do some statistic logic, such as QPS、log、etc
	OnEntryPassed(ctx *EntryContext)
	// OnEntryBlocked function will be invoked when StatPrepareSlots and RuleCheckSlots fail to execute
	// It may be inbound flow control or outbound cir
	// StatSlots will do some statistic logic, such as QPS、log、etc
	// blockError introduce the block detail
	OnEntryBlocked(ctx *EntryContext, blockError *BlockError)
	// OnCompleted function will be invoked when chain exits.
	// The semantics of OnCompleted is the entry passed and completed
	// Note: blocked entry will not call this function
	OnCompleted(ctx *EntryContext)
}

StatSlot is responsible for counting all custom biz metrics. StatSlot would not handle any panic, and pass up all panic to slot chain

type TimePredicate 

type TimePredicate func(uint64) bool

type TokenResult 

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

func NewTokenResult 

func NewTokenResult(status TokenResultStatus, blockErrOpts ...BlockErrorOption) *TokenResult

func NewTokenResultBlocked 

func NewTokenResultBlocked(blockType BlockType) *TokenResult

func NewTokenResultBlockedWithCause 

func NewTokenResultBlockedWithCause(blockType BlockType, blockMsg string, rule SentinelRule, snapshot interface{}) *TokenResult

func NewTokenResultBlockedWithMessage 

func NewTokenResultBlockedWithMessage(blockType BlockType, blockMsg string) *TokenResult

func NewTokenResultPass 

func NewTokenResultPass() *TokenResult

func NewTokenResultShouldWait 

func NewTokenResultShouldWait(waitNs time.Duration) *TokenResult

func (*TokenResult) BlockError 

func (r *TokenResult) BlockError() *BlockError

func (*TokenResult) DeepCopyFrom 

func (r *TokenResult) DeepCopyFrom(newResult *TokenResult)

func (*TokenResult) IsBlocked 

func (r *TokenResult) IsBlocked() bool

func (*TokenResult) IsPass 

func (r *TokenResult) IsPass() bool

func (*TokenResult) NanosToWait 

func (r *TokenResult) NanosToWait() time.Duration

func (*TokenResult) ResetToBlocked 

func (r *TokenResult) ResetToBlocked(blockType BlockType)

func (*TokenResult) ResetToBlockedWith 

func (r *TokenResult) ResetToBlockedWith(opts ...BlockErrorOption)

func (*TokenResult) ResetToBlockedWithCause 

func (r *TokenResult) ResetToBlockedWithCause(blockType BlockType, blockMsg string, rule SentinelRule, snapshot interface{})

func (*TokenResult) ResetToBlockedWithMessage 

func (r *TokenResult) ResetToBlockedWithMessage(blockType BlockType, blockMsg string)

func (*TokenResult) ResetToPass 

func (r *TokenResult) ResetToPass()

func (*TokenResult) Status 

func (r *TokenResult) Status() TokenResultStatus

func (*TokenResult) String 

func (r *TokenResult) String() string

type TokenResultStatus 

type TokenResultStatus uint8
const (
	ResultStatusPass TokenResultStatus = iota
	ResultStatusBlocked
	ResultStatusShouldWait
)

func (TokenResultStatus) String 

func (s TokenResultStatus) String() string

type TrafficType 

type TrafficType int32

TrafficType describes the traffic type: Inbound or Outbound 

const (
	// Inbound represents the inbound traffic (e.g. provider)
	Inbound TrafficType = iota
	// Outbound represents the outbound traffic (e.g. consumer)
	Outbound
)

func (TrafficType) String 

func (t TrafficType) String() string

type WriteStat 

type WriteStat interface {
	// AddCount adds given count to the metric of provided MetricEvent.
	AddCount(event MetricEvent, count int64)
}

Source Files

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