handler

package
v3.6.0 Latest Latest
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 Go to latest Published: Apr 1, 2022 License: GPL-3.0 Imports: 13 Imported by: 2

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func DelInitFunc 

func DelInitFunc(typ string)

DelInitFunc deletes the init func for this plugin type. It is a noop if pluginType is not registered.

func DelPlugin 

func DelPlugin(tag string)

DelPlugin deletes this plugin tag. It is a noop if tag is not registered.

func ExecChainNode 

func ExecChainNode(ctx context.Context, qCtx *Context, n ExecutableChainNode) error

func GetConfigurablePluginTypes 

func GetConfigurablePluginTypes() []string

GetConfigurablePluginTypes returns all plugin types which are configurable.

func MustRegPlugin 

func MustRegPlugin(p Plugin)

MustRegPlugin will panic the tag of p has already been registered.

func PurgePluginRegister 

func PurgePluginRegister()

PurgePluginRegister should only be used in testing.

func RegInitFunc 

func RegInitFunc(typ string, initFunc NewPluginFunc, argsType NewArgsFunc)

RegInitFunc registers the type. If the type has been registered. RegInitFunc will panic.

func RegPlugin 

func RegPlugin(p Plugin) bool

RegPlugin registers Plugin p. RegPlugin will not register p and returns false if the tag of p has already been registered.

func WeakDecode 

func WeakDecode(in map[string]interface{}, output interface{}) error

WeakDecode decodes args from config to output.

Types

type BP 

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

BP represents a basic plugin, which implements Plugin. It also has an internal logger, for convenience.

func NewBP 

func NewBP(tag string, typ string) *BP

NewBP creates a new BP and initials its logger.

func NewBPWithLog added in v3.6.0 

func NewBPWithLog(tag string, typ string, lc *mlog.LogConfig) (*BP, error)

NewBPWithLog creates a new BP and initials its logger with a static level.

func (*BP) L 

func (p *BP) L() *zap.Logger

func (*BP) S 

func (p *BP) S() *zap.SugaredLogger

func (*BP) Shutdown 

func (p *BP) Shutdown() error

func (*BP) Tag 

func (p *BP) Tag() string

func (*BP) Type 

func (p *BP) Type() string

type Config 

type Config struct {
	// Tag, required
	Tag string `yaml:"tag"`

	// Type, required
	Type string `yaml:"type"`

	LogConfig mlog.LogConfig `yaml:"log"`

	// Args, might be required by some plugins
	Args map[string]interface{} `yaml:"args"`
}

Config represents a plugin config

type Context 

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

Context is a query context that pass through plugins A Context will always have a non-nil Q. Context MUST be created by NewContext.

func NewContext 

func NewContext(q *dns.Msg, meta *RequestMeta) *Context

NewContext creates a new query Context. q is the query dns msg. It cannot be nil, or NewContext will panic. meta can be nil.

func (*Context) Copy 

func (ctx *Context) Copy() *Context

Copy deep copies this Context.

func (*Context) CopyTo 

func (ctx *Context) CopyTo(d *Context) *Context

CopyTo deep copies this Context to d.

func (*Context) Id 

func (ctx *Context) Id() uint32

Id returns the Context id. Note: This id is not the dns msg id. It's a unique uint32 growing with the number of query.

func (*Context) InfoField 

func (ctx *Context) InfoField() zap.Field

InfoField returns a zap.Field. Just for convenience.

func (*Context) OriginalQuery 

func (ctx *Context) OriginalQuery() *dns.Msg

OriginalQuery returns the copied original query msg a that created the Context. It always returns a non-nil msg. The returned msg SHOULD NOT be modified.

func (*Context) Q 

func (ctx *Context) Q() *dns.Msg

Q returns the query msg. It always returns a non-nil msg.

func (*Context) R 

func (ctx *Context) R() *dns.Msg

R returns the response. It might be nil.

func (*Context) ReqMeta 

func (ctx *Context) ReqMeta() *RequestMeta

ReqMeta returns the request metadata. The returned *RequestMeta is a reference shared by all ReqMeta. Caller must not modify it.

func (*Context) SetResponse 

func (ctx *Context) SetResponse(r *dns.Msg, status ContextStatus)

SetResponse stores the response r to the context. Note: It just stores the pointer of r. So the caller shouldn't modify or read r after the call.

func (*Context) StartTime 

func (ctx *Context) StartTime() time.Time

StartTime returns the time when the Context was created.

func (*Context) Status 

func (ctx *Context) Status() ContextStatus

Status returns the context status.

func (*Context) String 

func (ctx *Context) String() string

String returns a short summery of its query.

type ContextStatus 

type ContextStatus uint8
const (
	ContextStatusWaitingResponse ContextStatus = iota
	ContextStatusResponded
	ContextStatusServerFailed
	ContextStatusDropped
	ContextStatusRejected
)

func (ContextStatus) String 

func (status ContextStatus) String() string

type DummyExecutablePlugin 

type DummyExecutablePlugin struct {
	*BP
	WantSkip  bool
	WantSleep time.Duration
	WantR     *dns.Msg
	WantErr   error
}

func (*DummyExecutablePlugin) Exec 

func (d *DummyExecutablePlugin) Exec(ctx context.Context, qCtx *Context, next ExecutableChainNode) error

type DummyMatcherPlugin 

type DummyMatcherPlugin struct {
	*BP
	Matched bool
	WantErr error
}

func (*DummyMatcherPlugin) Match 

func (d *DummyMatcherPlugin) Match(_ context.Context, _ *Context) (matched bool, err error)

type DummyServicePlugin 

type DummyServicePlugin struct {
	*BP
	WantShutdownErr error
}

func (*DummyServicePlugin) Shutdown 

func (d *DummyServicePlugin) Shutdown() error

type Executable 

type Executable interface {
	Exec(ctx context.Context, qCtx *Context, next ExecutableChainNode) error
}

Executable represents something that is executable.

type ExecutableChainNode 

type ExecutableChainNode interface {
	Executable
	LinkedListNode
}

ExecutableChainNode represents a node in a executable chain.

func FirstNode 

func FirstNode(n ExecutableChainNode) ExecutableChainNode

FirstNode returns the first node of chain of n.

func LastNode 

func LastNode(n ExecutableChainNode) ExecutableChainNode

LastNode returns the Latest node of chain of n.

func WrapExecutable 

func WrapExecutable(e Executable) ExecutableChainNode

WrapExecutable wraps a Executable to a ExecutableChainNode.

type ExecutableNodeWrapper 

type ExecutableNodeWrapper struct {
	Executable
	NodeLinker
}

ExecutableNodeWrapper wraps a Executable to a ExecutableChainNode.

type ExecutablePlugin 

type ExecutablePlugin interface {
	Plugin
	Executable
}

ExecutablePlugin represents a Plugin that is Executable.

type LinkedListNode 

type LinkedListNode interface {
	Previous() ExecutableChainNode
	Next() ExecutableChainNode
	LinkPrevious(n ExecutableChainNode)
	LinkNext(n ExecutableChainNode)
}

type Matcher 

type Matcher interface {
	Match(ctx context.Context, qCtx *Context) (matched bool, err error)
}

Matcher represents a matcher that can match a certain patten in Context.

type MatcherPlugin 

type MatcherPlugin interface {
	Plugin
	Matcher
}

MatcherPlugin represents a Plugin that is a Matcher.

type NewArgsFunc 

type NewArgsFunc func() interface{}

NewArgsFunc represents a func that creates a new args object.

type NewPluginFunc 

type NewPluginFunc func(bp *BP, args interface{}) (p Plugin, err error)

NewPluginFunc represents a func that can init a Plugin. args is the object created by NewArgsFunc.

type NodeLinker 

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

NodeLinker implements LinkedListNode.

func (*NodeLinker) LinkNext 

func (l *NodeLinker) LinkNext(n ExecutableChainNode)

func (*NodeLinker) LinkPrevious 

func (l *NodeLinker) LinkPrevious(n ExecutableChainNode)

func (*NodeLinker) Next 

func (l *NodeLinker) Next() ExecutableChainNode

func (*NodeLinker) Previous 

func (l *NodeLinker) Previous() ExecutableChainNode

type Plugin 

type Plugin interface {
	Tag() string
	Type() string
	Shutdown() error
}

Plugin represents the basic plugin.

func GetPluginAll 

func GetPluginAll() []Plugin

GetPluginAll returns all registered plugins.

func NewPlugin 

func NewPlugin(c *Config) (p Plugin, err error)

NewPlugin initialize a Plugin from c.

type PluginError 

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

func NewPluginError 

func NewPluginError(tag string, err error) *PluginError

func (*PluginError) Error 

func (e *PluginError) Error() string

func (*PluginError) Is 

func (e *PluginError) Is(target error) bool

func (*PluginError) Unwrap 

func (e *PluginError) Unwrap() error

type PluginInterfaceType 

type PluginInterfaceType uint8
const (
	PITESExecutable PluginInterfaceType = iota
	PITMatcher
)

type PluginWrapper 

type PluginWrapper struct {
	Plugin
	// contains filtered or unexported fields
}

PluginWrapper wraps the original plugin to avoid extremely frequently interface conversion.

func GetPlugin 

func GetPlugin(tag string) (p *PluginWrapper)

GetPlugin gets a registered PluginWrapper. Also see PluginWrapper.

func NewPluginWrapper 

func NewPluginWrapper(gp Plugin) *PluginWrapper

func (*PluginWrapper) Exec 

func (w *PluginWrapper) Exec(ctx context.Context, qCtx *Context, next ExecutableChainNode) error

func (*PluginWrapper) Is 

func (w *PluginWrapper) Is(t PluginInterfaceType) bool

func (*PluginWrapper) Match 

func (w *PluginWrapper) Match(ctx context.Context, qCtx *Context) (matched bool, err error)

type RequestMeta 

type RequestMeta struct {
	// ClientIP contains the client ip address.
	ClientIP net.IP

	// FromUDP indicates the request is from an udp socket.
	FromUDP bool
}

RequestMeta represents some metadata about the request.

type TypeInfo 

type TypeInfo struct {
	NewPlugin NewPluginFunc
	NewArgs   NewArgsFunc
}

func GetInitFunc 

func GetInitFunc(typ string) (TypeInfo, bool)

GetInitFunc gets the registered type init func.

Source Files

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