rcmgr

package
v0.2.4-alpha.16 Latest Latest
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 Go to latest Published: Aug 23, 2023 License: GPL-3.0 Imports: 4 Imported by: 0

README

ResourceManager

ResourceManager interface manages resources within SP system, tracking and accounting for usage across the stack, from internal components to applications. It also allows for resource usage to be limited based on user-configurable policies.

Concept

Limit

The module of the resource manager is to restrict resource usage at the time of reservation. When a component of the stack needs to use a resource, it reserves it in the appropriate scope. The resource manager gates the reservation against the scope applicable limits; if the limit is exceeded, then an error is up the component to act accordingly. At the lower levels of the stack, this will normally signal a failure of some sorts, like failing to opening a connection, which will propagate to the programmer. Some components may be able to handle resource reservation failure more gracefully.

The Limit is configured by the user policy. supports MemoryLimit,ConnectionsLimit, FDLimit(file descriptor limit), TaskLimit. The MemoryLimit limits maximum memory for a component reservation. The ConnectionsLimit limits maximum connections number for a component reservation, includes inbound and outbound connections. The FDLimitlimits maximum fd number for a component reservation, includes the open of sockets and files.

The TaskLimit is unique to SP. Task is the smallest unit of SP internal component interaction. Each component can limit the number of tasks executed. Tasks are divided into high, medium and low priorities, the priority can be used as an important basis for task scheduling within SP. The higher the priority, the faster it is expected to be executed, and the resources will be assigned priority for execution, such as seal object. The lower the priority, it can be executed later, and the resource requirements are not so urgent, such as delayed deletion.

Scope

Resource Management through the ResourceManager is based on the concept of Resource Management Scopes, whereby resource usage is constrained by a DAG of scopes, The following diagram illustrates the structure of the resource constraint DAG:

System(Topmost Scope)

	+------------> Transient(Scope)........................+................+
	|                                                      .                .
	+------------> Service(Scope)------------------------- . ----------+    .
	|                                                      .           |    .
			   	   +--->  Connection/Memory/Task---------- . ----------+    .

Scope is an important node in DAG, Scope has children and siblings scopes. There is a directed edge between them. The children scopes share the limit of the parent scope, the child scope reserves the resources, the parent scope will reduce the corresponding amount of resources. Sibling scopes also have directionality, for example Service A Scope depends on(points to) System Scope, Service A reserves the resources, the System Scope will reduce the corresponding amount of resources. On the contrary, if the System Scope reserves resources, it will not affect Service A.

Example

    rcmgr := &ResourceManager{}
    serviceScope, err := rcmgr.OpenService(...)
	if err != nil { ... }
    defer scope.Close()
	
    s, err := serviceScope.BeginSpan()
	if err != nil { ... }
	defer s.Done()

	if err := s.ReserveMemory(...); err != nil { ... }
	// ... use memory

Documentation

Overview

Package rcmgr is a generated GoMock package.

Package rcmgr is a generated GoMock package.

Index

Constants

View Source 
const (
	MaxLimitInt64 = math.MaxInt64
	MaxLimitInt   = math.MaxInt
)
View Source 
const (
	// ReservationPriorityLow is a reservation priority that indicates a reservation if the scope
	// memory utilization is at 40% or less.
	ReservationPriorityLow uint8 = 101
	// ReservationPriorityMedium is a reservation priority that indicates a reservation if the scope
	// memory utilization is at 60% or less.
	ReservationPriorityMedium uint8 = 152
	// ReservationPriorityHigh is a reservation priority that indicates a reservation if the scope
	// memory utilization is at 80% or less.
	ReservationPriorityHigh uint8 = 203
	// ReservationPriorityAlways is a reservation priority that indicates a reservation if there is
	// enough memory, regardless of scope utilization.
	ReservationPriorityAlways uint8 = 255
)

Variables

This section is empty.

Functions

This section is empty.

Types

type Direction 

type Direction int

Direction represents which peer in a stream initiated a connection. 

const (
	// DirUnknown is the default direction.
	DirUnknown Direction = iota
	// DirInbound is for when the remote peer initiated a connection.
	DirInbound
	// DirOutbound is for when the local peer initiated a connection.
	DirOutbound
)

type Limit 

type Limit interface {
	// GetMemoryLimit returns the (current) memory limit.
	GetMemoryLimit() int64
	// GetFDLimit returns the file descriptor limit.
	GetFDLimit() int
	// GetConnLimit returns the connection limit, for inbound or outbound connections.
	GetConnLimit(Direction) int
	// GetConnTotalLimit returns the total connection limit.
	GetConnTotalLimit() int
	// GetTaskLimit returns the task limit, for high, medium and low priority tasks.
	GetTaskLimit(ReserveTaskPriority) int
	// GetTaskTotalLimit returns the total task limit.
	GetTaskTotalLimit() int
	ScopeStat() *ScopeStat
	// NotLess returns an indicator whether cover the param limit fields.
	NotLess(Limit) bool
	// Add params limits fields value to self.
	Add(Limit)
	// Sub params limits fields value to self.
	Sub(Limit) bool
	// Equal returns an indicator whether equal the param limit.
	Equal(Limit) bool
	// String returns the Limit state string.
	String() string
}

Limit is an interface that that specifies basic resource limits.

type Limiter 

type Limiter interface {
	// GetSystemLimits returns the system limits.
	GetSystemLimits() Limit
	// GetTransientLimits returns the transient limits.
	GetTransientLimits() Limit
	// GetServiceLimits returns a service-specific limits.
	GetServiceLimits(svc string) Limit
	// String returns the all kinds of Limit state string
	String() string
}

Limiter is an interface for providing limits to the resource manager.

type MockLimit added in v0.2.4 

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

MockLimit is a mock of Limit interface.

func NewMockLimit added in v0.2.4 

func NewMockLimit(ctrl *gomock.Controller) *MockLimit

NewMockLimit creates a new mock instance.

func (*MockLimit) Add added in v0.2.4 

func (m *MockLimit) Add(arg0 Limit)

Add mocks base method.

func (*MockLimit) EXPECT added in v0.2.4 

func (m *MockLimit) EXPECT() *MockLimitMockRecorder

EXPECT returns an object that allows the caller to indicate expected use.

func (*MockLimit) Equal added in v0.2.4 

func (m *MockLimit) Equal(arg0 Limit) bool

Equal mocks base method.

func (*MockLimit) GetConnLimit added in v0.2.4 

func (m *MockLimit) GetConnLimit(arg0 Direction) int

GetConnLimit mocks base method.

func (*MockLimit) GetConnTotalLimit added in v0.2.4 

func (m *MockLimit) GetConnTotalLimit() int

GetConnTotalLimit mocks base method.

func (*MockLimit) GetFDLimit added in v0.2.4 

func (m *MockLimit) GetFDLimit() int

GetFDLimit mocks base method.

func (*MockLimit) GetMemoryLimit added in v0.2.4 

func (m *MockLimit) GetMemoryLimit() int64

GetMemoryLimit mocks base method.

func (*MockLimit) GetTaskLimit added in v0.2.4 

func (m *MockLimit) GetTaskLimit(arg0 ReserveTaskPriority) int

GetTaskLimit mocks base method.

func (*MockLimit) GetTaskTotalLimit added in v0.2.4 

func (m *MockLimit) GetTaskTotalLimit() int

GetTaskTotalLimit mocks base method.

func (*MockLimit) NotLess added in v0.2.4 

func (m *MockLimit) NotLess(arg0 Limit) bool

NotLess mocks base method.

func (*MockLimit) ScopeStat added in v0.2.4 

func (m *MockLimit) ScopeStat() *ScopeStat

ScopeStat mocks base method.

func (*MockLimit) String added in v0.2.4 

func (m *MockLimit) String() string

String mocks base method.

func (*MockLimit) Sub added in v0.2.4 

func (m *MockLimit) Sub(arg0 Limit) bool

Sub mocks base method.

type MockLimitMockRecorder added in v0.2.4 

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

MockLimitMockRecorder is the mock recorder for MockLimit.

func (*MockLimitMockRecorder) Add added in v0.2.4 

func (mr *MockLimitMockRecorder) Add(arg0 interface{}) *gomock.Call

Add indicates an expected call of Add.

func (*MockLimitMockRecorder) Equal added in v0.2.4 

func (mr *MockLimitMockRecorder) Equal(arg0 interface{}) *gomock.Call

Equal indicates an expected call of Equal.

func (*MockLimitMockRecorder) GetConnLimit added in v0.2.4 

func (mr *MockLimitMockRecorder) GetConnLimit(arg0 interface{}) *gomock.Call

GetConnLimit indicates an expected call of GetConnLimit.

func (*MockLimitMockRecorder) GetConnTotalLimit added in v0.2.4 

func (mr *MockLimitMockRecorder) GetConnTotalLimit() *gomock.Call

GetConnTotalLimit indicates an expected call of GetConnTotalLimit.

func (*MockLimitMockRecorder) GetFDLimit added in v0.2.4 

func (mr *MockLimitMockRecorder) GetFDLimit() *gomock.Call

GetFDLimit indicates an expected call of GetFDLimit.

func (*MockLimitMockRecorder) GetMemoryLimit added in v0.2.4 

func (mr *MockLimitMockRecorder) GetMemoryLimit() *gomock.Call

GetMemoryLimit indicates an expected call of GetMemoryLimit.

func (*MockLimitMockRecorder) GetTaskLimit added in v0.2.4 

func (mr *MockLimitMockRecorder) GetTaskLimit(arg0 interface{}) *gomock.Call

GetTaskLimit indicates an expected call of GetTaskLimit.

func (*MockLimitMockRecorder) GetTaskTotalLimit added in v0.2.4 

func (mr *MockLimitMockRecorder) GetTaskTotalLimit() *gomock.Call

GetTaskTotalLimit indicates an expected call of GetTaskTotalLimit.

func (*MockLimitMockRecorder) NotLess added in v0.2.4 

func (mr *MockLimitMockRecorder) NotLess(arg0 interface{}) *gomock.Call

NotLess indicates an expected call of NotLess.

func (*MockLimitMockRecorder) ScopeStat added in v0.2.4 

func (mr *MockLimitMockRecorder) ScopeStat() *gomock.Call

ScopeStat indicates an expected call of ScopeStat.

func (*MockLimitMockRecorder) String added in v0.2.4 

func (mr *MockLimitMockRecorder) String() *gomock.Call

String indicates an expected call of String.

func (*MockLimitMockRecorder) Sub added in v0.2.4 

func (mr *MockLimitMockRecorder) Sub(arg0 interface{}) *gomock.Call

Sub indicates an expected call of Sub.

type MockLimiter added in v0.2.4 

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

MockLimiter is a mock of Limiter interface.

func NewMockLimiter added in v0.2.4 

func NewMockLimiter(ctrl *gomock.Controller) *MockLimiter

NewMockLimiter creates a new mock instance.

func (*MockLimiter) EXPECT added in v0.2.4 

func (m *MockLimiter) EXPECT() *MockLimiterMockRecorder

EXPECT returns an object that allows the caller to indicate expected use.

func (*MockLimiter) GetServiceLimits added in v0.2.4 

func (m *MockLimiter) GetServiceLimits(svc string) Limit

GetServiceLimits mocks base method.

func (*MockLimiter) GetSystemLimits added in v0.2.4 

func (m *MockLimiter) GetSystemLimits() Limit

GetSystemLimits mocks base method.

func (*MockLimiter) GetTransientLimits added in v0.2.4 

func (m *MockLimiter) GetTransientLimits() Limit

GetTransientLimits mocks base method.

func (*MockLimiter) String added in v0.2.4 

func (m *MockLimiter) String() string

String mocks base method.

type MockLimiterMockRecorder added in v0.2.4 

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

MockLimiterMockRecorder is the mock recorder for MockLimiter.

func (*MockLimiterMockRecorder) GetServiceLimits added in v0.2.4 

func (mr *MockLimiterMockRecorder) GetServiceLimits(svc interface{}) *gomock.Call

GetServiceLimits indicates an expected call of GetServiceLimits.

func (*MockLimiterMockRecorder) GetSystemLimits added in v0.2.4 

func (mr *MockLimiterMockRecorder) GetSystemLimits() *gomock.Call

GetSystemLimits indicates an expected call of GetSystemLimits.

func (*MockLimiterMockRecorder) GetTransientLimits added in v0.2.4 

func (mr *MockLimiterMockRecorder) GetTransientLimits() *gomock.Call

GetTransientLimits indicates an expected call of GetTransientLimits.

func (*MockLimiterMockRecorder) String added in v0.2.4 

func (mr *MockLimiterMockRecorder) String() *gomock.Call

String indicates an expected call of String.

type MockResourceManager added in v0.2.4 

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

MockResourceManager is a mock of ResourceManager interface.

func NewMockResourceManager added in v0.2.4 

func NewMockResourceManager(ctrl *gomock.Controller) *MockResourceManager

NewMockResourceManager creates a new mock instance.

func (*MockResourceManager) Close added in v0.2.4 

func (m *MockResourceManager) Close() error

Close mocks base method.

func (*MockResourceManager) EXPECT added in v0.2.4 

func (m *MockResourceManager) EXPECT() *MockResourceManagerMockRecorder

EXPECT returns an object that allows the caller to indicate expected use.

func (*MockResourceManager) OpenService added in v0.2.4 

func (m *MockResourceManager) OpenService(svc string) (ResourceScope, error)

OpenService mocks base method.

func (*MockResourceManager) ServiceState added in v0.2.4 

func (m *MockResourceManager) ServiceState(arg0 string) string

ServiceState mocks base method.

func (*MockResourceManager) SystemState added in v0.2.4 

func (m *MockResourceManager) SystemState() string

SystemState mocks base method.

func (*MockResourceManager) TransientState added in v0.2.4 

func (m *MockResourceManager) TransientState() string

TransientState mocks base method.

func (*MockResourceManager) ViewService added in v0.2.4 

func (m *MockResourceManager) ViewService(arg0 string, arg1 func(ResourceScope) error) error

ViewService mocks base method.

func (*MockResourceManager) ViewSystem added in v0.2.4 

func (m *MockResourceManager) ViewSystem(arg0 func(ResourceScope) error) error

ViewSystem mocks base method.

func (*MockResourceManager) ViewTransient added in v0.2.4 

func (m *MockResourceManager) ViewTransient(arg0 func(ResourceScope) error) error

ViewTransient mocks base method.

type MockResourceManagerMockRecorder added in v0.2.4 

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

MockResourceManagerMockRecorder is the mock recorder for MockResourceManager.

func (*MockResourceManagerMockRecorder) Close added in v0.2.4 

func (mr *MockResourceManagerMockRecorder) Close() *gomock.Call

Close indicates an expected call of Close.

func (*MockResourceManagerMockRecorder) OpenService added in v0.2.4 

func (mr *MockResourceManagerMockRecorder) OpenService(svc interface{}) *gomock.Call

OpenService indicates an expected call of OpenService.

func (*MockResourceManagerMockRecorder) ServiceState added in v0.2.4 

func (mr *MockResourceManagerMockRecorder) ServiceState(arg0 interface{}) *gomock.Call

ServiceState indicates an expected call of ServiceState.

func (*MockResourceManagerMockRecorder) SystemState added in v0.2.4 

func (mr *MockResourceManagerMockRecorder) SystemState() *gomock.Call

SystemState indicates an expected call of SystemState.

func (*MockResourceManagerMockRecorder) TransientState added in v0.2.4 

func (mr *MockResourceManagerMockRecorder) TransientState() *gomock.Call

TransientState indicates an expected call of TransientState.

func (*MockResourceManagerMockRecorder) ViewService added in v0.2.4 

func (mr *MockResourceManagerMockRecorder) ViewService(arg0, arg1 interface{}) *gomock.Call

ViewService indicates an expected call of ViewService.

func (*MockResourceManagerMockRecorder) ViewSystem added in v0.2.4 

func (mr *MockResourceManagerMockRecorder) ViewSystem(arg0 interface{}) *gomock.Call

ViewSystem indicates an expected call of ViewSystem.

func (*MockResourceManagerMockRecorder) ViewTransient added in v0.2.4 

func (mr *MockResourceManagerMockRecorder) ViewTransient(arg0 interface{}) *gomock.Call

ViewTransient indicates an expected call of ViewTransient.

type MockResourceScope added in v0.2.4 

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

MockResourceScope is a mock of ResourceScope interface.

func NewMockResourceScope added in v0.2.4 

func NewMockResourceScope(ctrl *gomock.Controller) *MockResourceScope

NewMockResourceScope creates a new mock instance.

func (*MockResourceScope) AddConn added in v0.2.4 

func (m *MockResourceScope) AddConn(dir Direction) error

AddConn mocks base method.

func (*MockResourceScope) AddTask added in v0.2.4 

func (m *MockResourceScope) AddTask(num int, prio ReserveTaskPriority) error

AddTask mocks base method.

func (*MockResourceScope) BeginSpan added in v0.2.4 

func (m *MockResourceScope) BeginSpan() (ResourceScopeSpan, error)

BeginSpan mocks base method.

func (*MockResourceScope) EXPECT added in v0.2.4 

func (m *MockResourceScope) EXPECT() *MockResourceScopeMockRecorder

EXPECT returns an object that allows the caller to indicate expected use.

func (*MockResourceScope) Name added in v0.2.4 

func (m *MockResourceScope) Name() string

Name mocks base method.

func (*MockResourceScope) Release added in v0.2.4 

func (m *MockResourceScope) Release()

Release mocks base method.

func (*MockResourceScope) ReleaseMemory added in v0.2.4 

func (m *MockResourceScope) ReleaseMemory(size int64)

ReleaseMemory mocks base method.

func (*MockResourceScope) RemainingResource added in v0.2.4 

func (m *MockResourceScope) RemainingResource() (Limit, error)

RemainingResource mocks base method.

func (*MockResourceScope) RemoveConn added in v0.2.4 

func (m *MockResourceScope) RemoveConn(dir Direction)

RemoveConn mocks base method.

func (*MockResourceScope) RemoveTask added in v0.2.4 

func (m *MockResourceScope) RemoveTask(num int, prio ReserveTaskPriority)

RemoveTask mocks base method.

func (*MockResourceScope) ReserveMemory added in v0.2.4 

func (m *MockResourceScope) ReserveMemory(size int64, prio uint8) error

ReserveMemory mocks base method.

func (*MockResourceScope) ReserveResources added in v0.2.4 

func (m *MockResourceScope) ReserveResources(st *ScopeStat) error

ReserveResources mocks base method.

func (*MockResourceScope) Stat added in v0.2.4 

func (m *MockResourceScope) Stat() ScopeStat

Stat mocks base method.

type MockResourceScopeMockRecorder added in v0.2.4 

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

MockResourceScopeMockRecorder is the mock recorder for MockResourceScope.

func (*MockResourceScopeMockRecorder) AddConn added in v0.2.4 

func (mr *MockResourceScopeMockRecorder) AddConn(dir interface{}) *gomock.Call

AddConn indicates an expected call of AddConn.

func (*MockResourceScopeMockRecorder) AddTask added in v0.2.4 

func (mr *MockResourceScopeMockRecorder) AddTask(num, prio interface{}) *gomock.Call

AddTask indicates an expected call of AddTask.

func (*MockResourceScopeMockRecorder) BeginSpan added in v0.2.4 

func (mr *MockResourceScopeMockRecorder) BeginSpan() *gomock.Call

BeginSpan indicates an expected call of BeginSpan.

func (*MockResourceScopeMockRecorder) Name added in v0.2.4 

func (mr *MockResourceScopeMockRecorder) Name() *gomock.Call

Name indicates an expected call of Name.

func (*MockResourceScopeMockRecorder) Release added in v0.2.4 

func (mr *MockResourceScopeMockRecorder) Release() *gomock.Call

Release indicates an expected call of Release.

func (*MockResourceScopeMockRecorder) ReleaseMemory added in v0.2.4 

func (mr *MockResourceScopeMockRecorder) ReleaseMemory(size interface{}) *gomock.Call

ReleaseMemory indicates an expected call of ReleaseMemory.

func (*MockResourceScopeMockRecorder) RemainingResource added in v0.2.4 

func (mr *MockResourceScopeMockRecorder) RemainingResource() *gomock.Call

RemainingResource indicates an expected call of RemainingResource.

func (*MockResourceScopeMockRecorder) RemoveConn added in v0.2.4 

func (mr *MockResourceScopeMockRecorder) RemoveConn(dir interface{}) *gomock.Call

RemoveConn indicates an expected call of RemoveConn.

func (*MockResourceScopeMockRecorder) RemoveTask added in v0.2.4 

func (mr *MockResourceScopeMockRecorder) RemoveTask(num, prio interface{}) *gomock.Call

RemoveTask indicates an expected call of RemoveTask.

func (*MockResourceScopeMockRecorder) ReserveMemory added in v0.2.4 

func (mr *MockResourceScopeMockRecorder) ReserveMemory(size, prio interface{}) *gomock.Call

ReserveMemory indicates an expected call of ReserveMemory.

func (*MockResourceScopeMockRecorder) ReserveResources added in v0.2.4 

func (mr *MockResourceScopeMockRecorder) ReserveResources(st interface{}) *gomock.Call

ReserveResources indicates an expected call of ReserveResources.

func (*MockResourceScopeMockRecorder) Stat added in v0.2.4 

func (mr *MockResourceScopeMockRecorder) Stat() *gomock.Call

Stat indicates an expected call of Stat.

type MockResourceScopeSpan added in v0.2.4 

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

MockResourceScopeSpan is a mock of ResourceScopeSpan interface.

func NewMockResourceScopeSpan added in v0.2.4 

func NewMockResourceScopeSpan(ctrl *gomock.Controller) *MockResourceScopeSpan

NewMockResourceScopeSpan creates a new mock instance.

func (*MockResourceScopeSpan) AddConn added in v0.2.4 

func (m *MockResourceScopeSpan) AddConn(dir Direction) error

AddConn mocks base method.

func (*MockResourceScopeSpan) AddTask added in v0.2.4 

func (m *MockResourceScopeSpan) AddTask(num int, prio ReserveTaskPriority) error

AddTask mocks base method.

func (*MockResourceScopeSpan) BeginSpan added in v0.2.4 

func (m *MockResourceScopeSpan) BeginSpan() (ResourceScopeSpan, error)

BeginSpan mocks base method.

func (*MockResourceScopeSpan) Done added in v0.2.4 

func (m *MockResourceScopeSpan) Done()

Done mocks base method.

func (*MockResourceScopeSpan) EXPECT added in v0.2.4 

func (m *MockResourceScopeSpan) EXPECT() *MockResourceScopeSpanMockRecorder

EXPECT returns an object that allows the caller to indicate expected use.

func (*MockResourceScopeSpan) Name added in v0.2.4 

func (m *MockResourceScopeSpan) Name() string

Name mocks base method.

func (*MockResourceScopeSpan) Release added in v0.2.4 

func (m *MockResourceScopeSpan) Release()

Release mocks base method.

func (*MockResourceScopeSpan) ReleaseMemory added in v0.2.4 

func (m *MockResourceScopeSpan) ReleaseMemory(size int64)

ReleaseMemory mocks base method.

func (*MockResourceScopeSpan) RemainingResource added in v0.2.4 

func (m *MockResourceScopeSpan) RemainingResource() (Limit, error)

RemainingResource mocks base method.

func (*MockResourceScopeSpan) RemoveConn added in v0.2.4 

func (m *MockResourceScopeSpan) RemoveConn(dir Direction)

RemoveConn mocks base method.

func (*MockResourceScopeSpan) RemoveTask added in v0.2.4 

func (m *MockResourceScopeSpan) RemoveTask(num int, prio ReserveTaskPriority)

RemoveTask mocks base method.

func (*MockResourceScopeSpan) ReserveMemory added in v0.2.4 

func (m *MockResourceScopeSpan) ReserveMemory(size int64, prio uint8) error

ReserveMemory mocks base method.

func (*MockResourceScopeSpan) ReserveResources added in v0.2.4 

func (m *MockResourceScopeSpan) ReserveResources(st *ScopeStat) error

ReserveResources mocks base method.

func (*MockResourceScopeSpan) Stat added in v0.2.4 

func (m *MockResourceScopeSpan) Stat() ScopeStat

Stat mocks base method.

type MockResourceScopeSpanMockRecorder added in v0.2.4 

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

MockResourceScopeSpanMockRecorder is the mock recorder for MockResourceScopeSpan.

func (*MockResourceScopeSpanMockRecorder) AddConn added in v0.2.4 

func (mr *MockResourceScopeSpanMockRecorder) AddConn(dir interface{}) *gomock.Call

AddConn indicates an expected call of AddConn.

func (*MockResourceScopeSpanMockRecorder) AddTask added in v0.2.4 

func (mr *MockResourceScopeSpanMockRecorder) AddTask(num, prio interface{}) *gomock.Call

AddTask indicates an expected call of AddTask.

func (*MockResourceScopeSpanMockRecorder) BeginSpan added in v0.2.4 

func (mr *MockResourceScopeSpanMockRecorder) BeginSpan() *gomock.Call

BeginSpan indicates an expected call of BeginSpan.

func (*MockResourceScopeSpanMockRecorder) Done added in v0.2.4 

func (mr *MockResourceScopeSpanMockRecorder) Done() *gomock.Call

Done indicates an expected call of Done.

func (*MockResourceScopeSpanMockRecorder) Name added in v0.2.4 

func (mr *MockResourceScopeSpanMockRecorder) Name() *gomock.Call

Name indicates an expected call of Name.

func (*MockResourceScopeSpanMockRecorder) Release added in v0.2.4 

func (mr *MockResourceScopeSpanMockRecorder) Release() *gomock.Call

Release indicates an expected call of Release.

func (*MockResourceScopeSpanMockRecorder) ReleaseMemory added in v0.2.4 

func (mr *MockResourceScopeSpanMockRecorder) ReleaseMemory(size interface{}) *gomock.Call

ReleaseMemory indicates an expected call of ReleaseMemory.

func (*MockResourceScopeSpanMockRecorder) RemainingResource added in v0.2.4 

func (mr *MockResourceScopeSpanMockRecorder) RemainingResource() *gomock.Call

RemainingResource indicates an expected call of RemainingResource.

func (*MockResourceScopeSpanMockRecorder) RemoveConn added in v0.2.4 

func (mr *MockResourceScopeSpanMockRecorder) RemoveConn(dir interface{}) *gomock.Call

RemoveConn indicates an expected call of RemoveConn.

func (*MockResourceScopeSpanMockRecorder) RemoveTask added in v0.2.4 

func (mr *MockResourceScopeSpanMockRecorder) RemoveTask(num, prio interface{}) *gomock.Call

RemoveTask indicates an expected call of RemoveTask.

func (*MockResourceScopeSpanMockRecorder) ReserveMemory added in v0.2.4 

func (mr *MockResourceScopeSpanMockRecorder) ReserveMemory(size, prio interface{}) *gomock.Call

ReserveMemory indicates an expected call of ReserveMemory.

func (*MockResourceScopeSpanMockRecorder) ReserveResources added in v0.2.4 

func (mr *MockResourceScopeSpanMockRecorder) ReserveResources(st interface{}) *gomock.Call

ReserveResources indicates an expected call of ReserveResources.

func (*MockResourceScopeSpanMockRecorder) Stat added in v0.2.4 

func (mr *MockResourceScopeSpanMockRecorder) Stat() *gomock.Call

Stat indicates an expected call of Stat.

type MockResourceScopeViewer added in v0.2.4 

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

MockResourceScopeViewer is a mock of ResourceScopeViewer interface.

func NewMockResourceScopeViewer added in v0.2.4 

func NewMockResourceScopeViewer(ctrl *gomock.Controller) *MockResourceScopeViewer

NewMockResourceScopeViewer creates a new mock instance.

func (*MockResourceScopeViewer) EXPECT added in v0.2.4 

func (m *MockResourceScopeViewer) EXPECT() *MockResourceScopeViewerMockRecorder

EXPECT returns an object that allows the caller to indicate expected use.

func (*MockResourceScopeViewer) ServiceState added in v0.2.4 

func (m *MockResourceScopeViewer) ServiceState(arg0 string) string

ServiceState mocks base method.

func (*MockResourceScopeViewer) SystemState added in v0.2.4 

func (m *MockResourceScopeViewer) SystemState() string

SystemState mocks base method.

func (*MockResourceScopeViewer) TransientState added in v0.2.4 

func (m *MockResourceScopeViewer) TransientState() string

TransientState mocks base method.

func (*MockResourceScopeViewer) ViewService added in v0.2.4 

func (m *MockResourceScopeViewer) ViewService(arg0 string, arg1 func(ResourceScope) error) error

ViewService mocks base method.

func (*MockResourceScopeViewer) ViewSystem added in v0.2.4 

func (m *MockResourceScopeViewer) ViewSystem(arg0 func(ResourceScope) error) error

ViewSystem mocks base method.

func (*MockResourceScopeViewer) ViewTransient added in v0.2.4 

func (m *MockResourceScopeViewer) ViewTransient(arg0 func(ResourceScope) error) error

ViewTransient mocks base method.

type MockResourceScopeViewerMockRecorder added in v0.2.4 

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

MockResourceScopeViewerMockRecorder is the mock recorder for MockResourceScopeViewer.

func (*MockResourceScopeViewerMockRecorder) ServiceState added in v0.2.4 

func (mr *MockResourceScopeViewerMockRecorder) ServiceState(arg0 interface{}) *gomock.Call

ServiceState indicates an expected call of ServiceState.

func (*MockResourceScopeViewerMockRecorder) SystemState added in v0.2.4 

func (mr *MockResourceScopeViewerMockRecorder) SystemState() *gomock.Call

SystemState indicates an expected call of SystemState.

func (*MockResourceScopeViewerMockRecorder) TransientState added in v0.2.4 

func (mr *MockResourceScopeViewerMockRecorder) TransientState() *gomock.Call

TransientState indicates an expected call of TransientState.

func (*MockResourceScopeViewerMockRecorder) ViewService added in v0.2.4 

func (mr *MockResourceScopeViewerMockRecorder) ViewService(arg0, arg1 interface{}) *gomock.Call

ViewService indicates an expected call of ViewService.

func (*MockResourceScopeViewerMockRecorder) ViewSystem added in v0.2.4 

func (mr *MockResourceScopeViewerMockRecorder) ViewSystem(arg0 interface{}) *gomock.Call

ViewSystem indicates an expected call of ViewSystem.

func (*MockResourceScopeViewerMockRecorder) ViewTransient added in v0.2.4 

func (mr *MockResourceScopeViewerMockRecorder) ViewTransient(arg0 interface{}) *gomock.Call

ViewTransient indicates an expected call of ViewTransient.

type NullLimit 

type NullLimit struct{}

NullLimit is a stub for tests and initialization of default values

func (*NullLimit) Add 

func (n *NullLimit) Add(Limit)

func (*NullLimit) Equal 

func (n *NullLimit) Equal(Limit) bool

func (*NullLimit) GetConnLimit 

func (n *NullLimit) GetConnLimit(Direction) int

func (*NullLimit) GetConnTotalLimit 

func (n *NullLimit) GetConnTotalLimit() int

func (*NullLimit) GetFDLimit 

func (n *NullLimit) GetFDLimit() int

func (*NullLimit) GetMemoryLimit 

func (n *NullLimit) GetMemoryLimit() int64

func (*NullLimit) GetServiceLimits 

func (n *NullLimit) GetServiceLimits(svc string) Limit

func (*NullLimit) GetSystemLimits 

func (n *NullLimit) GetSystemLimits() Limit

func (*NullLimit) GetTaskLimit 

func (n *NullLimit) GetTaskLimit(ReserveTaskPriority) int

func (*NullLimit) GetTaskTotalLimit 

func (n *NullLimit) GetTaskTotalLimit() int

func (*NullLimit) GetTransientLimits 

func (n *NullLimit) GetTransientLimits() Limit

func (*NullLimit) NotLess 

func (n *NullLimit) NotLess(Limit) bool

func (*NullLimit) ScopeStat 

func (n *NullLimit) ScopeStat() *ScopeStat

func (*NullLimit) String 

func (n *NullLimit) String() string

func (*NullLimit) Sub 

func (n *NullLimit) Sub(Limit) bool

type NullResourceManager 

type NullResourceManager struct{}

NullResourceManager is a stub for tests and initialization of default values

func (*NullResourceManager) Close 

func (n *NullResourceManager) Close() error

func (*NullResourceManager) OpenService 

func (n *NullResourceManager) OpenService(svc string) (ResourceScope, error)

func (*NullResourceManager) ServiceLimitString 

func (n *NullResourceManager) ServiceLimitString(string, func(ResourceScope) string) string

func (*NullResourceManager) ServiceState 

func (n *NullResourceManager) ServiceState(string) string

func (*NullResourceManager) SystemLimitString 

func (n *NullResourceManager) SystemLimitString(func(ResourceScope) string) string

func (*NullResourceManager) SystemState 

func (n *NullResourceManager) SystemState() string

func (*NullResourceManager) TransientLimitString 

func (n *NullResourceManager) TransientLimitString(func(ResourceScope) string) string

func (*NullResourceManager) TransientState 

func (n *NullResourceManager) TransientState() string

func (*NullResourceManager) ViewService 

func (n *NullResourceManager) ViewService(svc string, f func(ResourceScope) error) error

func (*NullResourceManager) ViewSystem 

func (n *NullResourceManager) ViewSystem(f func(ResourceScope) error) error

func (*NullResourceManager) ViewTransient 

func (n *NullResourceManager) ViewTransient(f func(ResourceScope) error) error

type NullScope 

type NullScope struct{}

NullScope is a stub for tests and initialization of default values

func (*NullScope) AddConn 

func (n *NullScope) AddConn(dir Direction) error

func (*NullScope) AddTask 

func (n *NullScope) AddTask(num int, prio ReserveTaskPriority) error

func (*NullScope) BeginSpan 

func (n *NullScope) BeginSpan() (ResourceScopeSpan, error)

func (*NullScope) Done 

func (n *NullScope) Done()

func (*NullScope) Name 

func (n *NullScope) Name() string

func (*NullScope) Release 

func (n *NullScope) Release()

func (*NullScope) ReleaseMemory 

func (n *NullScope) ReleaseMemory(size int64)

func (*NullScope) RemainingResource 

func (n *NullScope) RemainingResource() (Limit, error)

func (*NullScope) RemoveConn 

func (n *NullScope) RemoveConn(dir Direction)

func (*NullScope) RemoveTask 

func (n *NullScope) RemoveTask(num int, prio ReserveTaskPriority)

func (*NullScope) ReserveMemory 

func (n *NullScope) ReserveMemory(size int64, prio uint8) error

func (*NullScope) ReserveResources 

func (n *NullScope) ReserveResources(st *ScopeStat) error

func (*NullScope) Stat 

func (n *NullScope) Stat() ScopeStat

type ReserveTaskPriority 

type ReserveTaskPriority int

ReserveTaskPriority represents which priority in a reservation of task. 

const (
	// ReserveTaskPriorityUnknown is the default task priority.
	ReserveTaskPriorityUnknown ReserveTaskPriority = iota
	// ReserveTaskPriorityHigh is a task reservation priority that indicates a
	// reservation consume a high task limit.
	ReserveTaskPriorityHigh
	// ReserveTaskPriorityMedium is a task reservation priority that indicates a
	// reservation consume a medium task limit.
	ReserveTaskPriorityMedium
	// ReserveTaskPriorityLow is a task reservation priority that indicates a
	// reservation consume a low task limit.
	ReserveTaskPriorityLow
)

type ResourceManager 

type ResourceManager interface {
	ResourceScopeViewer
	// OpenService creates a new Service scope associated with System/Transient Scope
	// The caller owns the returned scope and is responsible for calling Done in order
	// to signify the end of the scope's span.
	OpenService(svc string) (ResourceScope, error)
	// Close closes the resource manager
	Close() error
}

ResourceManager is the interface to the resource management subsystem. The ResourceManager tracks and accounts for resource usage in the stack, from the internals to the application, and provides a mechanism to limit resource usage according to a user configurable policy.

Resource Management through the ResourceManager is based on the concept of Resource Management Scopes, whereby resource usage is constrained by a DAG of scopes, The following diagram illustrates the structure of the resource constraint DAG: System 

+------------> Transient........................+................+
|                                               .                .
+------------> Service------------------------- . ----------+    .
|                                               .           |    .
		   	   +--->  Connection/Memory/Task--- . ----------+    .

The basic resources accounted by the ResourceManager include memory, connections, file descriptors and task. These account for both space and time used by the stack, as each resource has a direct effect on the system availability and performance.

The module of the resource manager is to restrict resource usage at the time of reservation. When a component of the stack needs to use a resource, it reserves it in the appropriate scope. The resource manager gates the reservation against the scope applicable limits; if the limit is exceeded, then an error is up the component to act accordingly. At the lower levels of the stack, this will normally signal a failure of some sorts, like failing to opening a connection, which will propagate to the programmer. Some components may be able to handle resource reservation failure more gracefully. All resources reserved in some scopes are released when the scope is closed. For low level scopes, mainly Service and Connection scopes, this happens when the service or connection is closed.

Service programmers will typically use the resource manager to reserve memory for their subsystem. This happens with two avenues: the programmer can attach a connection to a service, whereby resources reserved by the connection are automatically accounted in the service budget; or the programmer may directly interact with the service scope, by using ViewService through the resource manager interface.

Application programmers can also directly reserve memory in some applicable scope. In order to facilitate control flow delimited resource accounting, all scopes defined in the system allow for the user to create spans. Spans are temporary scopes rooted at some other scope and release their resources when the programmer is done with them. Span scopes can form trees, with nested spans.

Typical Usage:

  • Low level components of the system all have access to the resource manager and create connection scopes through it. These scopes are accessible to the user, albeit with a narrower interface, through Conn objects who have a Scope method.
  • Services typically center around connections, where the programmer can attach connections to a particular service. They can also directly reserve memory for a service by accessing the service scope using the ResourceManager interface.
  • Applications that want to account for their resource usage can reserve memory, typically using a span, directly in the System or a Service scope.

type ResourceScope 

type ResourceScope interface {
	// ReserveMemory reserves memory/buffer space in the scope; the unit is bytes.
	//
	// If ReserveMemory returns an error, then no memory was reserved and the caller
	// should handle the failure condition.
	//
	// The priority argument indicates the priority of the memory reservation. A reservation
	// will fail if the available memory is less than (1+prio)/256 of the scope limit, providing
	// a mechanism to gracefully handle optional reservations that might overload the system.
	//
	// There are 4 predefined priority levels, Low, Medium, High and Always, capturing common
	// patterns, but the user is free to use any granularity applicable to his case.
	ReserveMemory(size int64, prio uint8) error
	// ReleaseMemory explicitly releases memory previously reserved with ReserveMemory
	ReleaseMemory(size int64)
	// AddTask reserves task by ReserveTaskPriority in the scope.
	//
	// If ReserveTask returns an error, then no task quota was reserved and the caller
	// should handle the failure condition.
	AddTask(num int, prio ReserveTaskPriority) error
	// RemoveTask explicitly releases task reserved with AddTask.
	RemoveTask(num int, prio ReserveTaskPriority)
	// AddConn reserves connection by Direction in the scope.
	AddConn(dir Direction) error
	// RemoveConn explicitly releases connection reserved with AddConn.
	RemoveConn(dir Direction)
	// ReserveResources reserves the resource by ScopeStat, it will reserve all kinds
	// of resources atomic
	ReserveResources(st *ScopeStat) error
	// RemainingResource returns the remaining resource that have not be reserved
	RemainingResource() (Limit, error)
	// Stat retrieves current resource usage for the scope.
	Stat() ScopeStat
	// Name returns the name of this scope
	Name() string
	// BeginSpan creates a new span scope rooted at this scope
	BeginSpan() (ResourceScopeSpan, error)
	// Release resource at this scope
	Release()
}

ResourceScope is the interface for all scopes.

type ResourceScopeSpan 

type ResourceScopeSpan interface {
	ResourceScope
	// Done ends the span and releases associated resources.
	Done()
}

ResourceScopeSpan is a ResourceScope with a delimited span. Span scopes are control flow delimited and release all their associated resources when the programmer calls Done.

Example: 

s, err := someScope.BeginSpan()
if err != nil { ... }
defer s.Done()

if err := s.ReserveMemory(...); err != nil { ... }
// ... use memory

type ResourceScopeViewer 

type ResourceScopeViewer interface {
	// ViewSystem views the system-wide resource scope.
	// The system scope is the top level scope that accounts for global
	// resource usage at all levels of the system. This scope constrains all
	// other scopes and institutes global hard limits.
	ViewSystem(func(ResourceScope) error) error
	// ViewTransient views the transient (DMZ) resource scope.
	// The transient scope accounts for resources that are in the process of
	// full establishment.  For instance, a new connection prior to the
	// handshake does not belong to any service, but it still needs to be
	// constrained as this opens an avenue for attacks in transient resource
	// usage.
	ViewTransient(func(ResourceScope) error) error
	// ViewService retrieves a service-specific scope.
	ViewService(string, func(ResourceScope) error) error
	// SystemState output the system resource scope and limit readable
	SystemState() string
	// TransientState output the transient (DMZ)  resource scope and limit readable
	TransientState() string
	// ServiceState output a service-specific resource scope and limit readable
	ServiceState(string) string
}

ResourceScopeViewer is a mixin interface providing view methods for accessing top level scopes

type ScopeStat 

type ScopeStat struct {
	Memory           int64
	NumTasksHigh     int64
	NumTasksMedium   int64
	NumTasksLow      int64
	NumConnsInbound  int64
	NumConnsOutbound int64
	NumFD            int64
}

ScopeStat is a struct containing resource accounting information.

func (ScopeStat) String 

func (s ScopeStat) String() string

String returns the state string of ScopeStat TODO:: supports connections and fd field

type Unlimited 

type Unlimited struct{}

func (*Unlimited) Add 

func (n *Unlimited) Add(Limit)

func (*Unlimited) Equal 

func (n *Unlimited) Equal(Limit) bool

func (*Unlimited) GetConnLimit 

func (n *Unlimited) GetConnLimit(Direction) int

func (*Unlimited) GetConnTotalLimit 

func (n *Unlimited) GetConnTotalLimit() int

func (*Unlimited) GetFDLimit 

func (n *Unlimited) GetFDLimit() int

func (*Unlimited) GetMemoryLimit 

func (n *Unlimited) GetMemoryLimit() int64

func (*Unlimited) GetServiceLimits 

func (n *Unlimited) GetServiceLimits(svc string) Limit

func (*Unlimited) GetSystemLimits 

func (n *Unlimited) GetSystemLimits() Limit

func (*Unlimited) GetTaskLimit 

func (n *Unlimited) GetTaskLimit(ReserveTaskPriority) int

func (*Unlimited) GetTaskTotalLimit 

func (n *Unlimited) GetTaskTotalLimit() int

func (*Unlimited) GetTransientLimits 

func (n *Unlimited) GetTransientLimits() Limit

func (*Unlimited) NotLess 

func (n *Unlimited) NotLess(Limit) bool

func (*Unlimited) ScopeStat 

func (n *Unlimited) ScopeStat() *ScopeStat

func (*Unlimited) String 

func (n *Unlimited) String() string

func (*Unlimited) Sub 

func (n *Unlimited) Sub(Limit) bool

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