agent

package
v1.5.7 Latest Latest
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 Go to latest Published: Oct 27, 2020 License: MIT Imports: 11 Imported by: 0

README

UDF Agents and Servers

A UDF is a User Defined Function, meaning that you can write your own functions/algorithms and plug them into Kapacitor. Your custom function runs in its own process and Kapacitor communicates with it via a defined protocol, see udf.proto. To facilitate working with the protocol several agents have been written in various languages that abstract the protocol communication through an interface in the respective languages. You can find those agent implementations in this directory and subdirectories based on language name.

Example uses of the agents can be found in the examples directory. These examples are working examples and are executed as part of the testing suite, see server_test.go.

Child process vs Socket

There are two approaches for writing UDFs.

  • A child process based approach where Kapacitor spawns a child process and communicates over STDIN/STDOUT.
  • A socket based approach where you start the UDF process externally and Kapacitor connects to it over a socket.

For the socket based approach there will only ever be one instance of your UDF process running. Each use of the UDF in a TICKscript will be a new connection the socket. Where as each use of a process based UDF means a new child process is spawned for each.

Design

The protocol for communicating with Kapacitor consists of Request and Response messages. The agents wrap the communication and serialization and expose an interface that needs to be implemented to handle each request/response. In addition to the request/response paradigm agents provide a way to stream data back to Kapacitor. Your UDF is in control of when new points or batches are sent back to Kapacitor.

Agents and Servers

There are two main objects provided in the current implementations, an Agent and a Server. The Agent is responsible for managing the communication over input and output streams. The Server is responsible for accepting new connections and creating new Agents to handle those new connections.

Both process based and socket based UDFs will need to use an Agent to handle the communication/serialization aspects of the protocol. Only socket based UDFs need use the Server.

Writing an Agent for a new Language

The UDF protocol is designed to be simple and consists of reading and writing protocol buffer messages.

In order to write a UDF in the language of your choice your language must have protocol buffer support and be able to read and write to a socket.

The basic steps are:

  1. Add the language to the udf/io.go generate comment so the udf.proto code exists for your language.
  2. Implement a Varint encoder/decoder, this is trivial see the python implementation.
  3. Implement a method for reading and writing streamed protobuf messages. See udf.proto for more details.
  4. Create an interface for handling each of the request/responses.
  5. Write a loop for reading from an input stream and calling the handler interface, and write responses to an output stream.
  6. Provide an thread safe mechanism for writing points and batches to the output stream independent of the handler interface. This is easily accomplished with a synchronized write method, see the python implementation.
  7. Implement the examples using your new agent.
  8. Add your example to the test suite in cmd/kapacitord/run/server_test.go.

For process based UDFs it is expected that the process terminate after STDIN is closed and the remaining requests processed. After STDIN is closed, the agent process can continue to send Responses to Kapacitor as long as a keepalive timeout does not occur. Once a keepalive timeout is reached and after a 2*keepalive_time grace period, if the process has not terminated then it will be forcefully terminated.

Docker

It is expected that the example can run inside the test suite. Since generating different protocol buffer code requires different plugins and libraries to run we make use of Docker to provide the necessary environment. This makes testing the code easier as the developer does not have to install each supported language locally.

Documentation

Overview

Package agent is a generated protocol buffer package.

It is generated from these files: 

udf.proto

It has these top-level messages: 

InfoRequest
InfoResponse
OptionInfo
InitRequest
Option
OptionValue
InitResponse
SnapshotRequest
SnapshotResponse
RestoreRequest
RestoreResponse
KeepaliveRequest
KeepaliveResponse
ErrorResponse
BeginBatch
Point
EndBatch
Request
Response

Index

Constants

This section is empty.

Variables

View Source 
var EdgeType_name = map[int32]string{
	0: "STREAM",
	1: "BATCH",
}
View Source 
var EdgeType_value = map[string]int32{
	"STREAM": 0,
	"BATCH":  1,
}
View Source 
var ValueType_name = map[int32]string{
	0: "BOOL",
	1: "INT",
	2: "DOUBLE",
	3: "STRING",
	4: "DURATION",
}
View Source 
var ValueType_value = map[string]int32{
	"BOOL":     0,
	"INT":      1,
	"DOUBLE":   2,
	"STRING":   3,
	"DURATION": 4,
}

Functions

func ReadMessage added in v1.3.0 

func ReadMessage(buf *[]byte, r ByteReadReader, msg proto.Message) error

Read a message from io.ByteReader by first reading a varint size, and then reading and decoding the message object. If buf is not big enough a new buffer will be allocated to replace buf.

func WriteMessage added in v1.3.0 

func WriteMessage(msg proto.Message, w io.Writer) error

Write the message to the io.Writer with a varint size header.

Types

type Accepter added in v0.13.0 

type Accepter interface {
	// Accept new connections from the listener and handle them accordingly.
	// The typical action is to create a new Agent with the connection as both its in and out objects.
	Accept(net.Conn)
}

type Agent 

type Agent struct {

	// A channel for writing Responses, specifically Batch and Point responses.
	Responses chan<- *Response

	// The handler for requests.
	Handler Handler
	// contains filtered or unexported fields
}

Go implementation of a Kapacitor UDF agent. This agent is responsible for reading and writing messages over a socket.

The Agent requires a Handler object in order to fulfill requests.

func New 

func New(in io.ReadCloser, out io.WriteCloser) *Agent

Create a new Agent is the provided in/out objects. To create an Agent that reads from STDIN/STDOUT of the process use New(os.Stdin, os.Stdout)

func (*Agent) Start 

func (a *Agent) Start() error

Start the Agent, you must set an Handler on the agent before starting.

func (*Agent) Wait 

func (a *Agent) Wait() error

Wait for the Agent to terminate. The Agent will not terminate till the Responses channel is closed. You will need to close this channel externally, typically in the Stop method for the Handler. The Agent will terminate if the In reader is closed or an error occurs.

type BeginBatch added in v1.3.0 

type BeginBatch struct {
	Name   string            `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
	Group  string            `protobuf:"bytes,2,opt,name=group" json:"group,omitempty"`
	Tags   map[string]string `` /* 128-byte string literal not displayed */
	Size   int64             `protobuf:"varint,4,opt,name=size" json:"size,omitempty"`
	ByName bool              `protobuf:"varint,5,opt,name=byName" json:"byName,omitempty"`
}

Indicates the beginning of a batch. All subsequent points should be considered part of the batch until EndBatch arrives. This includes grouping. Batches of differing groups may not be interleaved.

All the meta data but tmax is provided, since tmax may not be known at the beginning of a batch.

Size is the number of points in the batch. If size is 0 then the batch has an undetermined size.

func (*BeginBatch) Descriptor added in v1.3.0 

func (*BeginBatch) Descriptor() ([]byte, []int)

func (*BeginBatch) GetTags added in v1.3.0 

func (m *BeginBatch) GetTags() map[string]string

func (*BeginBatch) ProtoMessage added in v1.3.0 

func (*BeginBatch) ProtoMessage()

func (*BeginBatch) Reset added in v1.3.0 

func (m *BeginBatch) Reset()

func (*BeginBatch) String added in v1.3.0 

func (m *BeginBatch) String() string

type ByteReadReader added in v1.3.0 

type ByteReadReader interface {
	io.Reader
	io.ByteReader
}

Interface for reading messages If you have an io.Reader wrap your reader in a bufio Reader to stasify this interface.

Example: brr := bufio.NewReader(reader)

type EdgeType added in v1.3.0 

type EdgeType int32
const (
	EdgeType_STREAM EdgeType = 0
	EdgeType_BATCH  EdgeType = 1
)

func (EdgeType) EnumDescriptor added in v1.3.0 

func (EdgeType) EnumDescriptor() ([]byte, []int)

func (EdgeType) String added in v1.3.0 

func (x EdgeType) String() string

type EndBatch added in v1.3.0 

type EndBatch struct {
	Name   string            `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
	Group  string            `protobuf:"bytes,2,opt,name=group" json:"group,omitempty"`
	Tmax   int64             `protobuf:"varint,3,opt,name=tmax" json:"tmax,omitempty"`
	Tags   map[string]string `` /* 128-byte string literal not displayed */
	ByName bool              `protobuf:"varint,5,opt,name=byName" json:"byName,omitempty"`
}

Indicates the end of a batch and contains all meta data associated with the batch. The same meta information is provided for ease of use with the addition of tmax since it may not be know at BeginBatch.

func (*EndBatch) Descriptor added in v1.3.0 

func (*EndBatch) Descriptor() ([]byte, []int)

func (*EndBatch) GetTags added in v1.3.0 

func (m *EndBatch) GetTags() map[string]string

func (*EndBatch) ProtoMessage added in v1.3.0 

func (*EndBatch) ProtoMessage()

func (*EndBatch) Reset added in v1.3.0 

func (m *EndBatch) Reset()

func (*EndBatch) String added in v1.3.0 

func (m *EndBatch) String() string

type ErrorResponse added in v1.3.0 

type ErrorResponse struct {
	Error string `protobuf:"bytes,1,opt,name=error" json:"error,omitempty"`
}

Sent from the process to Kapacitor indicating an error has occurred. If an ErrorResponse is received, Kapacitor will terminate the process.

func (*ErrorResponse) Descriptor added in v1.3.0 

func (*ErrorResponse) Descriptor() ([]byte, []int)

func (*ErrorResponse) ProtoMessage added in v1.3.0 

func (*ErrorResponse) ProtoMessage()

func (*ErrorResponse) Reset added in v1.3.0 

func (m *ErrorResponse) Reset()

func (*ErrorResponse) String added in v1.3.0 

func (m *ErrorResponse) String() string

type Handler 

type Handler interface {
	// Return the InfoResponse. Describing the properties of this Handler
	Info() (*InfoResponse, error)
	// Initialize the Handler with the provided options.
	Init(*InitRequest) (*InitResponse, error)
	// Create a snapshot of the running state of the handler.
	Snapshot() (*SnapshotResponse, error)
	// Restore a previous snapshot.
	Restore(*RestoreRequest) (*RestoreResponse, error)

	// A batch has begun.
	BeginBatch(*BeginBatch) error
	// A point has arrived.
	Point(*Point) error
	// The batch is complete.
	EndBatch(*EndBatch) error

	// Gracefully stop the Handler.
	// No other methods will be called.
	Stop()
}

The Agent calls the appropriate methods on the Handler as it receives requests over a socket.

Returning an error from any method will cause the Agent to stop and an ErrorResponse to be sent. Some *Response objects (like SnapshotResponse) allow for returning their own error within the object itself. These types of errors will not stop the Agent and Kapacitor will deal with them appropriately.

The Handler is called from a single goroutine, meaning methods will not be called concurrently.

To write Points/Batches back to the Agent/Kapacitor use the Agent.Responses channel.

type InfoRequest added in v1.3.0 

type InfoRequest struct {
}

Request that the process return information about available Options.

func (*InfoRequest) Descriptor added in v1.3.0 

func (*InfoRequest) Descriptor() ([]byte, []int)

func (*InfoRequest) ProtoMessage added in v1.3.0 

func (*InfoRequest) ProtoMessage()

func (*InfoRequest) Reset added in v1.3.0 

func (m *InfoRequest) Reset()

func (*InfoRequest) String added in v1.3.0 

func (m *InfoRequest) String() string

type InfoResponse added in v1.3.0 

type InfoResponse struct {
	Wants    EdgeType               `protobuf:"varint,1,opt,name=wants,enum=agent.EdgeType" json:"wants,omitempty"`
	Provides EdgeType               `protobuf:"varint,2,opt,name=provides,enum=agent.EdgeType" json:"provides,omitempty"`
	Options  map[string]*OptionInfo `` /* 134-byte string literal not displayed */
}

func (*InfoResponse) Descriptor added in v1.3.0 

func (*InfoResponse) Descriptor() ([]byte, []int)

func (*InfoResponse) GetOptions added in v1.3.0 

func (m *InfoResponse) GetOptions() map[string]*OptionInfo

func (*InfoResponse) ProtoMessage added in v1.3.0 

func (*InfoResponse) ProtoMessage()

func (*InfoResponse) Reset added in v1.3.0 

func (m *InfoResponse) Reset()

func (*InfoResponse) String added in v1.3.0 

func (m *InfoResponse) String() string

type InitRequest added in v1.3.0 

type InitRequest struct {
	Options []*Option `protobuf:"bytes,1,rep,name=options" json:"options,omitempty"`
	TaskID  string    `protobuf:"bytes,2,opt,name=taskID" json:"taskID,omitempty"`
	NodeID  string    `protobuf:"bytes,3,opt,name=nodeID" json:"nodeID,omitempty"`
}

Request that the process initialize itself with the provided options.

func (*InitRequest) Descriptor added in v1.3.0 

func (*InitRequest) Descriptor() ([]byte, []int)

func (*InitRequest) GetOptions added in v1.3.0 

func (m *InitRequest) GetOptions() []*Option

func (*InitRequest) ProtoMessage added in v1.3.0 

func (*InitRequest) ProtoMessage()

func (*InitRequest) Reset added in v1.3.0 

func (m *InitRequest) Reset()

func (*InitRequest) String added in v1.3.0 

func (m *InitRequest) String() string

type InitResponse added in v1.3.0 

type InitResponse struct {
	Success bool   `protobuf:"varint,1,opt,name=success" json:"success,omitempty"`
	Error   string `protobuf:"bytes,2,opt,name=error" json:"error,omitempty"`
}

Respond to Kapacitor whether initialization was successful.

func (*InitResponse) Descriptor added in v1.3.0 

func (*InitResponse) Descriptor() ([]byte, []int)

func (*InitResponse) ProtoMessage added in v1.3.0 

func (*InitResponse) ProtoMessage()

func (*InitResponse) Reset added in v1.3.0 

func (m *InitResponse) Reset()

func (*InitResponse) String added in v1.3.0 

func (m *InitResponse) String() string

type KeepaliveRequest added in v1.3.0 

type KeepaliveRequest struct {
	// The number of nanoseconds since the epoch.
	// Used only for debugging keepalive requests.
	Time int64 `protobuf:"varint,1,opt,name=time" json:"time,omitempty"`
}

Request that the process respond with a Keepalive to verify it is responding.

func (*KeepaliveRequest) Descriptor added in v1.3.0 

func (*KeepaliveRequest) Descriptor() ([]byte, []int)

func (*KeepaliveRequest) ProtoMessage added in v1.3.0 

func (*KeepaliveRequest) ProtoMessage()

func (*KeepaliveRequest) Reset added in v1.3.0 

func (m *KeepaliveRequest) Reset()

func (*KeepaliveRequest) String added in v1.3.0 

func (m *KeepaliveRequest) String() string

type KeepaliveResponse added in v1.3.0 

type KeepaliveResponse struct {
	// The number of nanoseconds since the epoch.
	// Used only for debugging keepalive requests.
	Time int64 `protobuf:"varint,1,opt,name=time" json:"time,omitempty"`
}

Respond to KeepaliveRequest

func (*KeepaliveResponse) Descriptor added in v1.3.0 

func (*KeepaliveResponse) Descriptor() ([]byte, []int)

func (*KeepaliveResponse) ProtoMessage added in v1.3.0 

func (*KeepaliveResponse) ProtoMessage()

func (*KeepaliveResponse) Reset added in v1.3.0 

func (m *KeepaliveResponse) Reset()

func (*KeepaliveResponse) String added in v1.3.0 

func (m *KeepaliveResponse) String() string

type Option added in v1.3.0 

type Option struct {
	Name   string         `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
	Values []*OptionValue `protobuf:"bytes,2,rep,name=values" json:"values,omitempty"`
}

func (*Option) Descriptor added in v1.3.0 

func (*Option) Descriptor() ([]byte, []int)

func (*Option) GetValues added in v1.3.0 

func (m *Option) GetValues() []*OptionValue

func (*Option) ProtoMessage added in v1.3.0 

func (*Option) ProtoMessage()

func (*Option) Reset added in v1.3.0 

func (m *Option) Reset()

func (*Option) String added in v1.3.0 

func (m *Option) String() string

type OptionInfo added in v1.3.0 

type OptionInfo struct {
	ValueTypes []ValueType `protobuf:"varint,1,rep,name=valueTypes,enum=agent.ValueType" json:"valueTypes,omitempty"`
}

func (*OptionInfo) Descriptor added in v1.3.0 

func (*OptionInfo) Descriptor() ([]byte, []int)

func (*OptionInfo) ProtoMessage added in v1.3.0 

func (*OptionInfo) ProtoMessage()

func (*OptionInfo) Reset added in v1.3.0 

func (m *OptionInfo) Reset()

func (*OptionInfo) String added in v1.3.0 

func (m *OptionInfo) String() string

type OptionValue added in v1.3.0 

type OptionValue struct {
	Type ValueType `protobuf:"varint,1,opt,name=type,enum=agent.ValueType" json:"type,omitempty"`
	// Types that are valid to be assigned to Value:
	//	*OptionValue_BoolValue
	//	*OptionValue_IntValue
	//	*OptionValue_DoubleValue
	//	*OptionValue_StringValue
	//	*OptionValue_DurationValue
	Value isOptionValue_Value `protobuf_oneof:"value"`
}

func (*OptionValue) Descriptor added in v1.3.0 

func (*OptionValue) Descriptor() ([]byte, []int)

func (*OptionValue) GetBoolValue added in v1.3.0 

func (m *OptionValue) GetBoolValue() bool

func (*OptionValue) GetDoubleValue added in v1.3.0 

func (m *OptionValue) GetDoubleValue() float64

func (*OptionValue) GetDurationValue added in v1.3.0 

func (m *OptionValue) GetDurationValue() int64

func (*OptionValue) GetIntValue added in v1.3.0 

func (m *OptionValue) GetIntValue() int64

func (*OptionValue) GetStringValue added in v1.3.0 

func (m *OptionValue) GetStringValue() string

func (*OptionValue) GetValue added in v1.3.0 

func (m *OptionValue) GetValue() isOptionValue_Value

func (*OptionValue) ProtoMessage added in v1.3.0 

func (*OptionValue) ProtoMessage()

func (*OptionValue) Reset added in v1.3.0 

func (m *OptionValue) Reset()

func (*OptionValue) String added in v1.3.0 

func (m *OptionValue) String() string

func (*OptionValue) XXX_OneofFuncs added in v1.3.0 

func (*OptionValue) XXX_OneofFuncs() (func(msg proto.Message, b *proto.Buffer) error, func(msg proto.Message, tag, wire int, b *proto.Buffer) (bool, error), func(msg proto.Message) (n int), []interface{})

XXX_OneofFuncs is for the internal use of the proto package.

type OptionValue_BoolValue added in v1.3.0 

type OptionValue_BoolValue struct {
	BoolValue bool `protobuf:"varint,2,opt,name=boolValue,oneof"`
}

type OptionValue_DoubleValue added in v1.3.0 

type OptionValue_DoubleValue struct {
	DoubleValue float64 `protobuf:"fixed64,4,opt,name=doubleValue,oneof"`
}

type OptionValue_DurationValue added in v1.3.0 

type OptionValue_DurationValue struct {
	DurationValue int64 `protobuf:"varint,6,opt,name=durationValue,oneof"`
}

type OptionValue_IntValue added in v1.3.0 

type OptionValue_IntValue struct {
	IntValue int64 `protobuf:"varint,3,opt,name=intValue,oneof"`
}

type OptionValue_StringValue added in v1.3.0 

type OptionValue_StringValue struct {
	StringValue string `protobuf:"bytes,5,opt,name=stringValue,oneof"`
}

type Point added in v1.3.0 

type Point struct {
	Time            int64              `protobuf:"varint,1,opt,name=time" json:"time,omitempty"`
	Name            string             `protobuf:"bytes,2,opt,name=name" json:"name,omitempty"`
	Database        string             `protobuf:"bytes,3,opt,name=database" json:"database,omitempty"`
	RetentionPolicy string             `protobuf:"bytes,4,opt,name=retentionPolicy" json:"retentionPolicy,omitempty"`
	Group           string             `protobuf:"bytes,5,opt,name=group" json:"group,omitempty"`
	Dimensions      []string           `protobuf:"bytes,6,rep,name=dimensions" json:"dimensions,omitempty"`
	Tags            map[string]string  `` /* 128-byte string literal not displayed */
	FieldsDouble    map[string]float64 `` /* 146-byte string literal not displayed */
	FieldsInt       map[string]int64   `` /* 139-byte string literal not displayed */
	FieldsString    map[string]string  `` /* 145-byte string literal not displayed */
	FieldsBool      map[string]bool    `` /* 142-byte string literal not displayed */
	ByName          bool               `protobuf:"varint,11,opt,name=byName" json:"byName,omitempty"`
}

Message containing information about a single data point. Can be sent on it's own or bookended by BeginBatch and EndBatch messages.

func (*Point) Descriptor added in v1.3.0 

func (*Point) Descriptor() ([]byte, []int)

func (*Point) GetFieldsBool added in v1.4.0 

func (m *Point) GetFieldsBool() map[string]bool

func (*Point) GetFieldsDouble added in v1.3.0 

func (m *Point) GetFieldsDouble() map[string]float64

func (*Point) GetFieldsInt added in v1.3.0 

func (m *Point) GetFieldsInt() map[string]int64

func (*Point) GetFieldsString added in v1.3.0 

func (m *Point) GetFieldsString() map[string]string

func (*Point) GetTags added in v1.3.0 

func (m *Point) GetTags() map[string]string

func (*Point) ProtoMessage added in v1.3.0 

func (*Point) ProtoMessage()

func (*Point) Reset added in v1.3.0 

func (m *Point) Reset()

func (*Point) String added in v1.3.0 

func (m *Point) String() string

type Request added in v1.3.0 

type Request struct {
	// Types that are valid to be assigned to Message:
	//	*Request_Info
	//	*Request_Init
	//	*Request_Keepalive
	//	*Request_Snapshot
	//	*Request_Restore
	//	*Request_Begin
	//	*Request_Point
	//	*Request_End
	Message isRequest_Message `protobuf_oneof:"message"`
}

Request message wrapper -- sent from Kapacitor to process

func (*Request) Descriptor added in v1.3.0 

func (*Request) Descriptor() ([]byte, []int)

func (*Request) GetBegin added in v1.3.0 

func (m *Request) GetBegin() *BeginBatch

func (*Request) GetEnd added in v1.3.0 

func (m *Request) GetEnd() *EndBatch

func (*Request) GetInfo added in v1.3.0 

func (m *Request) GetInfo() *InfoRequest

func (*Request) GetInit added in v1.3.0 

func (m *Request) GetInit() *InitRequest

func (*Request) GetKeepalive added in v1.3.0 

func (m *Request) GetKeepalive() *KeepaliveRequest

func (*Request) GetMessage added in v1.3.0 

func (m *Request) GetMessage() isRequest_Message

func (*Request) GetPoint added in v1.3.0 

func (m *Request) GetPoint() *Point

func (*Request) GetRestore added in v1.3.0 

func (m *Request) GetRestore() *RestoreRequest

func (*Request) GetSnapshot added in v1.3.0 

func (m *Request) GetSnapshot() *SnapshotRequest

func (*Request) ProtoMessage added in v1.3.0 

func (*Request) ProtoMessage()

func (*Request) Reset added in v1.3.0 

func (m *Request) Reset()

func (*Request) String added in v1.3.0 

func (m *Request) String() string

func (*Request) XXX_OneofFuncs added in v1.3.0 

func (*Request) XXX_OneofFuncs() (func(msg proto.Message, b *proto.Buffer) error, func(msg proto.Message, tag, wire int, b *proto.Buffer) (bool, error), func(msg proto.Message) (n int), []interface{})

XXX_OneofFuncs is for the internal use of the proto package.

type Request_Begin added in v1.3.0 

type Request_Begin struct {
	Begin *BeginBatch `protobuf:"bytes,16,opt,name=begin,oneof"`
}

type Request_End added in v1.3.0 

type Request_End struct {
	End *EndBatch `protobuf:"bytes,18,opt,name=end,oneof"`
}

type Request_Info added in v1.3.0 

type Request_Info struct {
	Info *InfoRequest `protobuf:"bytes,1,opt,name=info,oneof"`
}

type Request_Init added in v1.3.0 

type Request_Init struct {
	Init *InitRequest `protobuf:"bytes,2,opt,name=init,oneof"`
}

type Request_Keepalive added in v1.3.0 

type Request_Keepalive struct {
	Keepalive *KeepaliveRequest `protobuf:"bytes,3,opt,name=keepalive,oneof"`
}

type Request_Point added in v1.3.0 

type Request_Point struct {
	Point *Point `protobuf:"bytes,17,opt,name=point,oneof"`
}

type Request_Restore added in v1.3.0 

type Request_Restore struct {
	Restore *RestoreRequest `protobuf:"bytes,5,opt,name=restore,oneof"`
}

type Request_Snapshot added in v1.3.0 

type Request_Snapshot struct {
	Snapshot *SnapshotRequest `protobuf:"bytes,4,opt,name=snapshot,oneof"`
}

type Response added in v1.3.0 

type Response struct {
	// Types that are valid to be assigned to Message:
	//	*Response_Info
	//	*Response_Init
	//	*Response_Keepalive
	//	*Response_Snapshot
	//	*Response_Restore
	//	*Response_Error
	//	*Response_Begin
	//	*Response_Point
	//	*Response_End
	Message isResponse_Message `protobuf_oneof:"message"`
}

Response message wrapper -- sent from process to Kapacitor

func (*Response) Descriptor added in v1.3.0 

func (*Response) Descriptor() ([]byte, []int)

func (*Response) GetBegin added in v1.3.0 

func (m *Response) GetBegin() *BeginBatch

func (*Response) GetEnd added in v1.3.0 

func (m *Response) GetEnd() *EndBatch

func (*Response) GetError added in v1.3.0 

func (m *Response) GetError() *ErrorResponse

func (*Response) GetInfo added in v1.3.0 

func (m *Response) GetInfo() *InfoResponse

func (*Response) GetInit added in v1.3.0 

func (m *Response) GetInit() *InitResponse

func (*Response) GetKeepalive added in v1.3.0 

func (m *Response) GetKeepalive() *KeepaliveResponse

func (*Response) GetMessage added in v1.3.0 

func (m *Response) GetMessage() isResponse_Message

func (*Response) GetPoint added in v1.3.0 

func (m *Response) GetPoint() *Point

func (*Response) GetRestore added in v1.3.0 

func (m *Response) GetRestore() *RestoreResponse

func (*Response) GetSnapshot added in v1.3.0 

func (m *Response) GetSnapshot() *SnapshotResponse

func (*Response) ProtoMessage added in v1.3.0 

func (*Response) ProtoMessage()

func (*Response) Reset added in v1.3.0 

func (m *Response) Reset()

func (*Response) String added in v1.3.0 

func (m *Response) String() string

func (*Response) XXX_OneofFuncs added in v1.3.0 

func (*Response) XXX_OneofFuncs() (func(msg proto.Message, b *proto.Buffer) error, func(msg proto.Message, tag, wire int, b *proto.Buffer) (bool, error), func(msg proto.Message) (n int), []interface{})

XXX_OneofFuncs is for the internal use of the proto package.

type Response_Begin added in v1.3.0 

type Response_Begin struct {
	Begin *BeginBatch `protobuf:"bytes,16,opt,name=begin,oneof"`
}

type Response_End added in v1.3.0 

type Response_End struct {
	End *EndBatch `protobuf:"bytes,18,opt,name=end,oneof"`
}

type Response_Error added in v1.3.0 

type Response_Error struct {
	Error *ErrorResponse `protobuf:"bytes,6,opt,name=error,oneof"`
}

type Response_Info added in v1.3.0 

type Response_Info struct {
	Info *InfoResponse `protobuf:"bytes,1,opt,name=info,oneof"`
}

type Response_Init added in v1.3.0 

type Response_Init struct {
	Init *InitResponse `protobuf:"bytes,2,opt,name=init,oneof"`
}

type Response_Keepalive added in v1.3.0 

type Response_Keepalive struct {
	Keepalive *KeepaliveResponse `protobuf:"bytes,3,opt,name=keepalive,oneof"`
}

type Response_Point added in v1.3.0 

type Response_Point struct {
	Point *Point `protobuf:"bytes,17,opt,name=point,oneof"`
}

type Response_Restore added in v1.3.0 

type Response_Restore struct {
	Restore *RestoreResponse `protobuf:"bytes,5,opt,name=restore,oneof"`
}

type Response_Snapshot added in v1.3.0 

type Response_Snapshot struct {
	Snapshot *SnapshotResponse `protobuf:"bytes,4,opt,name=snapshot,oneof"`
}

type RestoreRequest added in v1.3.0 

type RestoreRequest struct {
	Snapshot []byte `protobuf:"bytes,1,opt,name=snapshot,proto3" json:"snapshot,omitempty"`
}

Request that the process restore its state from a snapshot.

func (*RestoreRequest) Descriptor added in v1.3.0 

func (*RestoreRequest) Descriptor() ([]byte, []int)

func (*RestoreRequest) ProtoMessage added in v1.3.0 

func (*RestoreRequest) ProtoMessage()

func (*RestoreRequest) Reset added in v1.3.0 

func (m *RestoreRequest) Reset()

func (*RestoreRequest) String added in v1.3.0 

func (m *RestoreRequest) String() string

type RestoreResponse added in v1.3.0 

type RestoreResponse struct {
	Success bool   `protobuf:"varint,1,opt,name=success" json:"success,omitempty"`
	Error   string `protobuf:"bytes,2,opt,name=error" json:"error,omitempty"`
}

Respond with success or failure to a RestoreRequest

func (*RestoreResponse) Descriptor added in v1.3.0 

func (*RestoreResponse) Descriptor() ([]byte, []int)

func (*RestoreResponse) ProtoMessage added in v1.3.0 

func (*RestoreResponse) ProtoMessage()

func (*RestoreResponse) Reset added in v1.3.0 

func (m *RestoreResponse) Reset()

func (*RestoreResponse) String added in v1.3.0 

func (m *RestoreResponse) String() string

type Server added in v0.13.0 

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

A server accepts connections on a listener and spawns new Agents for each connection.

func NewServer added in v0.13.0 

func NewServer(l net.Listener, a Accepter) *Server

Create a new server.

func (*Server) Serve added in v0.13.0 

func (s *Server) Serve() error

Server starts the server and blocks.

func (*Server) Stop added in v0.13.0 

func (s *Server) Stop()

Stop closes the listener and stops all server activity.

func (*Server) StopOnSignals added in v0.13.0 

func (s *Server) StopOnSignals(signals ...os.Signal)

StopOnSignals registers a signal handler to stop the Server for the given signals.

type SnapshotRequest added in v1.3.0 

type SnapshotRequest struct {
}

Request that the process provide a snapshot of its state.

func (*SnapshotRequest) Descriptor added in v1.3.0 

func (*SnapshotRequest) Descriptor() ([]byte, []int)

func (*SnapshotRequest) ProtoMessage added in v1.3.0 

func (*SnapshotRequest) ProtoMessage()

func (*SnapshotRequest) Reset added in v1.3.0 

func (m *SnapshotRequest) Reset()

func (*SnapshotRequest) String added in v1.3.0 

func (m *SnapshotRequest) String() string

type SnapshotResponse added in v1.3.0 

type SnapshotResponse struct {
	Snapshot []byte `protobuf:"bytes,1,opt,name=snapshot,proto3" json:"snapshot,omitempty"`
}

Respond to Kapacitor with a serialized snapshot of the running state.

func (*SnapshotResponse) Descriptor added in v1.3.0 

func (*SnapshotResponse) Descriptor() ([]byte, []int)

func (*SnapshotResponse) ProtoMessage added in v1.3.0 

func (*SnapshotResponse) ProtoMessage()

func (*SnapshotResponse) Reset added in v1.3.0 

func (m *SnapshotResponse) Reset()

func (*SnapshotResponse) String added in v1.3.0 

func (m *SnapshotResponse) String() string

type ValueType added in v1.3.0 

type ValueType int32
const (
	ValueType_BOOL     ValueType = 0
	ValueType_INT      ValueType = 1
	ValueType_DOUBLE   ValueType = 2
	ValueType_STRING   ValueType = 3
	ValueType_DURATION ValueType = 4
)

func (ValueType) EnumDescriptor added in v1.3.0 

func (ValueType) EnumDescriptor() ([]byte, []int)

func (ValueType) String added in v1.3.0 

func (x ValueType) String() string

Source Files

View all Source files

Directories

Path Synopsis
examples
mirror
moving_avg
outliers

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