websocket

package
v0.0.0-...-1d39891 Latest Latest
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 Go to latest Published: May 12, 2020 License: Apache-2.0 Imports: 21 Imported by: 0

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Index

Constants

This section is empty.

Variables

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var DefaultRequestTimeout = 10 * time.Second

DefaultRequestTimeout default timeout used for Request/Reply JSON message.

Functions

This section is empty.

Types

type Client 

type Client struct {
	*Conn
	Path      string
	AuthOpts  *shttp.AuthenticationOpts
	TLSConfig *tls.Config
	Opts      ClientOpts
}

Client is a outgoint client meaning a client connected to a remote websocket server. It embeds a Conn.

func NewClient 

func NewClient(host string, clientType common.ServiceType, url *url.URL, opts ClientOpts) *Client

NewClient returns a Client with a new connection.

func (*Client) Connect 

func (c *Client) Connect() error

Connect to the server

func (*Client) Start 

func (c *Client) Start()

Start connects to the server - and reconnect if necessary

func (*Client) UpgradeToStructSpeaker 

func (c *Client) UpgradeToStructSpeaker() *StructSpeaker

UpgradeToStructSpeaker a WebSocket client to a StructSpeaker

type ClientOpts 

type ClientOpts struct {
	Protocol         Protocol
	AuthOpts         *shttp.AuthenticationOpts
	Headers          http.Header
	QueueSize        int
	WriteCompression bool
	TLSConfig        *tls.Config
	Logger           logging.Logger
}

ClientOpts defines some options that can be set when creating a new client

type ClientPool 

type ClientPool struct {
	*Pool
}

ClientPool is a pool of out going Speaker meaning connection to a remote Server.

func NewClientPool 

func NewClientPool(name string, opts PoolOpts) *ClientPool

NewClientPool returns a new ClientPool meaning a pool of outgoing Client.

func (*ClientPool) ConnectAll 

func (s *ClientPool) ConnectAll()

ConnectAll calls connect to all the wSSpeakers of the pool.

type Conn 

type Conn struct {
	common.RWMutex
	ConnStatus
	// contains filtered or unexported fields
}

Conn is the connection object of a Speaker

func (*Conn) AddEventHandler 

func (c *Conn) AddEventHandler(h SpeakerEventHandler)

AddEventHandler registers a new event handler

func (*Conn) Connect 

func (c *Conn) Connect() error

Connect default implementation doing nothing as for incoming connection it is not used.

func (*Conn) Flush 

func (c *Conn) Flush()

Flush all the pending sent messages

func (*Conn) GetAddrPort 

func (c *Conn) GetAddrPort() (string, int)

GetAddrPort returns the address and the port of the remote end.

func (*Conn) GetClientProtocol 

func (c *Conn) GetClientProtocol() Protocol

GetClientProtocol returns the websocket protocol.

func (*Conn) GetHeaders 

func (c *Conn) GetHeaders() http.Header

GetHeaders returns the client HTTP headers.

func (*Conn) GetHost 

func (c *Conn) GetHost() string

GetHost returns the hostname/host-id of the connection.

func (*Conn) GetRemoteHost 

func (c *Conn) GetRemoteHost() string

GetRemoteHost returns the hostname/host-id of the remote side of the connection.

func (*Conn) GetRemoteServiceType 

func (c *Conn) GetRemoteServiceType() common.ServiceType

GetRemoteServiceType returns the remote service type.

func (*Conn) GetServiceType 

func (c *Conn) GetServiceType() common.ServiceType

GetServiceType returns the client type.

func (*Conn) GetStatus 

func (c *Conn) GetStatus() ConnStatus

GetStatus returns the status of a WebSocket connection

func (*Conn) GetURL 

func (c *Conn) GetURL() *url.URL

GetURL returns the URL of the connection

func (*Conn) IsConnected 

func (c *Conn) IsConnected() bool

IsConnected returns the connection status.

func (*Conn) Run 

func (c *Conn) Run()

Run the main loop

func (*Conn) SendMessage 

func (c *Conn) SendMessage(m Message) error

SendMessage adds a message to sending queue.

func (*Conn) SendRaw 

func (c *Conn) SendRaw(b []byte) error

SendRaw adds raw bytes to sending queue.

func (*Conn) Start 

func (c *Conn) Start()

Start main loop in a goroutine

func (*Conn) Stop 

func (c *Conn) Stop()

Stop disconnect the speaker

func (*Conn) StopAndWait 

func (c *Conn) StopAndWait()

StopAndWait disconnect the speaker and wait for the goroutine to end

type ConnState 

type ConnState common.ServiceState

ConnState describes the connection state

func (*ConnState) CompareAndSwap 

func (s *ConnState) CompareAndSwap(old, new common.ServiceState) bool

CompareAndSwap executes the compare-and-swap operation for a state

func (*ConnState) Load 

func (s *ConnState) Load() common.ServiceState

Load atomatically loads and returns the state

func (*ConnState) MarshalJSON 

func (s *ConnState) MarshalJSON() ([]byte, error)

MarshalJSON marshal the connection state to JSON

func (*ConnState) Store 

func (s *ConnState) Store(state common.ServiceState)

Store atomatically stores the state

func (*ConnState) UnmarshalJSON 

func (s *ConnState) UnmarshalJSON(b []byte) error

UnmarshalJSON de-serialize a connection state

type ConnStatus 

type ConnStatus struct {
	ServiceType       common.ServiceType
	ClientProtocol    Protocol
	Addr              string
	Port              int
	Host              string      `json:"-"`
	State             *ConnState  `json:"IsConnected"`
	URL               *url.URL    `json:"-"`
	Headers           http.Header `json:"-"`
	ConnectTime       time.Time
	RemoteHost        string             `json:",omitempty"`
	RemoteServiceType common.ServiceType `json:",omitempty"`
}

ConnStatus describes the status of a WebSocket connection

type DefaultSpeakerEventHandler 

type DefaultSpeakerEventHandler struct {
}

DefaultSpeakerEventHandler implements stubs for the wsIncomingClientEventHandler interface

func (*DefaultSpeakerEventHandler) OnConnected 

func (d *DefaultSpeakerEventHandler) OnConnected(c Speaker)

OnConnected is called when the connection is established.

func (*DefaultSpeakerEventHandler) OnDisconnected 

func (d *DefaultSpeakerEventHandler) OnDisconnected(c Speaker)

OnDisconnected is called when the connection is closed or lost.

func (*DefaultSpeakerEventHandler) OnMessage 

func (d *DefaultSpeakerEventHandler) OnMessage(c Speaker, m Message)

OnMessage is called when a message is received.

type IncomerHandler 

type IncomerHandler func(*websocket.Conn, *auth.AuthenticatedRequest, clientPromoter) (Speaker, error)

IncomerHandler incoming client handler interface.

type MasterElection 

type MasterElection struct {
	common.RWMutex
	DefaultSpeakerEventHandler
	// contains filtered or unexported fields
}

MasterElection provides a mechanism based on etcd to elect a master from a SpeakerPool.

func NewMasterElection 

func NewMasterElection(pool SpeakerPool) *MasterElection

NewMasterElection returns a new MasterElection.

func (*MasterElection) AddEventHandler 

func (a *MasterElection) AddEventHandler(eventHandler MasterEventHandler)

AddEventHandler a new MasterEventHandler event handler.

func (*MasterElection) GetMaster 

func (a *MasterElection) GetMaster() Speaker

GetMaster returns the current master.

func (*MasterElection) OnConnected 

func (a *MasterElection) OnConnected(c Speaker)

OnConnected is triggered when a new Speaker get connected. If no master was elected this Speaker will be chosen as master.

func (*MasterElection) OnDisconnected 

func (a *MasterElection) OnDisconnected(c Speaker)

OnDisconnected is triggered when a new Speaker get disconnected. If it was the master a new election is triggered.

func (*MasterElection) SendMessageToMaster 

func (a *MasterElection) SendMessageToMaster(m Message)

SendMessageToMaster sends a message to the master.

type MasterEventHandler 

type MasterEventHandler interface {
	OnNewMaster(c Speaker)
}

MasterEventHandler is the interface to be implemented by master election listeners.

type Message 

type Message interface {
	Bytes(protocol Protocol) ([]byte, error)
}

Message is the interface of a message to send over the wire

type Pool 

type Pool struct {
	common.RWMutex
	// contains filtered or unexported fields
}

Pool is a connection container. It embed a list of Speaker.

func (*Pool) AddClient 

func (s *Pool) AddClient(c Speaker) error

AddClient adds the given Speaker to the pool.

func (*Pool) AddEventHandler 

func (s *Pool) AddEventHandler(h SpeakerEventHandler)

AddEventHandler registers a new event handler.

func (*Pool) BroadcastMessage 

func (s *Pool) BroadcastMessage(m Message)

BroadcastMessage broadcasts the given message.

func (*Pool) DisconnectAll 

func (s *Pool) DisconnectAll()

DisconnectAll disconnects all the Speaker

func (*Pool) GetName 

func (s *Pool) GetName() string

GetName returns the name of the pool

func (*Pool) GetSpeakerByRemoteHost 

func (s *Pool) GetSpeakerByRemoteHost(host string) Speaker

GetSpeakerByRemoteHost returns the Speaker for the given remote host.

func (*Pool) GetSpeakers 

func (s *Pool) GetSpeakers() (speakers []Speaker)

GetSpeakers returns the Speakers of the pool.

func (*Pool) GetSpeakersByType 

func (s *Pool) GetSpeakersByType(serviceType common.ServiceType) (speakers []Speaker)

GetSpeakersByType returns Speakers matching the given type.

func (*Pool) GetStatus 

func (s *Pool) GetStatus() map[string]ConnStatus

GetStatus returns the states of the WebSocket clients

func (*Pool) OnConnected 

func (s *Pool) OnConnected(c Speaker)

OnConnected forwards the OnConnected event to event listeners of the pool.

func (*Pool) OnDisconnected 

func (s *Pool) OnDisconnected(c Speaker)

OnDisconnected forwards the OnConnected event to event listeners of the pool.

func (*Pool) OnMessage 

func (s *Pool) OnMessage(c Speaker, m Message)

OnMessage forwards the OnMessage event to event listeners of the pool.

func (*Pool) PickConnectedSpeaker 

func (s *Pool) PickConnectedSpeaker() Speaker

PickConnectedSpeaker returns randomly a connected Speaker

func (*Pool) RemoveClient 

func (s *Pool) RemoveClient(c Speaker) bool

RemoveClient removes client from the pool

func (*Pool) SendMessageTo 

func (s *Pool) SendMessageTo(m Message, host string) error

SendMessageTo sends message to Speaker for the given remote host.

func (*Pool) Start 

func (s *Pool) Start()

Start starts the pool in a goroutine.

func (*Pool) Stop 

func (s *Pool) Stop()

Stop stops the pool and wait until stopped.

type PoolOpts 

type PoolOpts struct {
	Logger logging.Logger
}

PoolOpts defines pool options

type ProtobufObject 

type ProtobufObject interface {
	proto.Marshaler
	proto.Message
}

ProtobufObject defines an object that can be serialized in protobuf

type Protocol 

type Protocol string

Protocol used to transport messages 

const (
	// WildcardNamespace is the namespace used as wildcard. It is used by listeners to filter callbacks.
	WildcardNamespace = "*"

	// RawProtocol is used for raw messages
	RawProtocol Protocol = "raw"
	// ProtobufProtocol is used for protobuf encoded messages
	ProtobufProtocol Protocol = "protobuf"
	// JSONProtocol is used for JSON encoded messages
	JSONProtocol Protocol = "json"
)

func (*Protocol) String 

func (p *Protocol) String() string

type RawMessage 

type RawMessage []byte

RawMessage represents a raw message (array of bytes)

func (RawMessage) Bytes 

func (m RawMessage) Bytes(protocol Protocol) ([]byte, error)

Bytes returns the string representation of the raw message

type Server 

type Server struct {
	common.RWMutex
	// contains filtered or unexported fields
}

Server implements a websocket server. It owns a Pool of incoming Speakers.

func NewServer 

func NewServer(server *shttp.Server, endpoint string, authBackend shttp.AuthenticationBackend, opts ServerOpts) *Server

NewServer returns a new Server. The given auth backend will validate the credentials

func (Server) AddClient 

func (s Server) AddClient(c Speaker) error

AddClient adds the given Speaker to the incomerPool.

func (Server) OnDisconnected 

func (s Server) OnDisconnected(c Speaker)

OnDisconnected forwards the OnConnected event to event listeners of the pool.

type ServerOpts 

type ServerOpts struct {
	WriteCompression bool
	QueueSize        int
	PingDelay        time.Duration
	PongTimeout      time.Duration
	Logger           logging.Logger
}

ServerOpts defines server options

type Speaker 

type Speaker interface {
	GetStatus() ConnStatus
	GetHost() string
	GetAddrPort() (string, int)
	GetServiceType() common.ServiceType
	GetClientProtocol() Protocol
	GetHeaders() http.Header
	GetURL() *url.URL
	IsConnected() bool
	SendMessage(m Message) error
	SendRaw(r []byte) error
	Connect() error
	Start()
	Stop()
	StopAndWait()
	AddEventHandler(SpeakerEventHandler)
	GetRemoteHost() string
	GetRemoteServiceType() common.ServiceType
}

Speaker is the interface for a websocket speaking client. It is used for outgoing or incoming connections.

type SpeakerEventHandler 

type SpeakerEventHandler interface {
	OnMessage(c Speaker, m Message)
	OnConnected(c Speaker)
	OnDisconnected(c Speaker)
}

SpeakerEventHandler is the interface to be implement by the client events listeners.

type SpeakerPool 

type SpeakerPool interface {
	AddClient(c Speaker) error
	RemoveClient(c Speaker) bool
	AddEventHandler(h SpeakerEventHandler)
	GetSpeakers() []Speaker
	GetSpeakerByRemoteHost(host string) Speaker
	PickConnectedSpeaker() Speaker
	BroadcastMessage(m Message)
	SendMessageTo(m Message, host string) error
}

SpeakerPool is the interface that Speaker pools have to implement.

type SpeakerStructMessageDispatcher 

type SpeakerStructMessageDispatcher interface {
	AddStructMessageHandler(h SpeakerStructMessageHandler, namespaces []string)
}

SpeakerStructMessageDispatcher interface is used to dispatch OnStructMessage events.

type SpeakerStructMessageHandler 

type SpeakerStructMessageHandler interface {
	OnStructMessage(c Speaker, m *StructMessage)
}

SpeakerStructMessageHandler interface used to receive Struct messages.

type StructClientPool 

type StructClientPool struct {
	*ClientPool
	// contains filtered or unexported fields
}

StructClientPool is a ClientPool able to send StructMessage.

func NewStructClientPool 

func NewStructClientPool(name string, opts PoolOpts) *StructClientPool

NewStructClientPool returns a new StructClientPool.

func (*StructClientPool) AddClient 

func (s *StructClientPool) AddClient(c Speaker) error

AddClient adds a Client to the pool.

func (StructClientPool) AddStructMessageHandler 

func (d StructClientPool) AddStructMessageHandler(h SpeakerStructMessageHandler, namespaces []string)

AddStructMessageHandler adds a new listener for Struct messages.

func (StructClientPool) AddStructSpeaker 

func (d StructClientPool) AddStructSpeaker(c *StructSpeaker)

func (*StructClientPool) Request 

func (s *StructClientPool) Request(host string, request *StructMessage, timeout time.Duration) (*StructMessage, error)

Request sends a Request Struct message to the Speaker of the given remote host.

type StructServer 

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

StructServer is a Server able to handle StructSpeaker.

func NewStructServer 

func NewStructServer(server *Server) *StructServer

NewStructServer returns a new StructServer

func (StructServer) AddClient 

func (s StructServer) AddClient(c Speaker) error

AddClient adds the given Speaker to the incomerPool.

func (StructServer) AddStructMessageHandler 

func (d StructServer) AddStructMessageHandler(h SpeakerStructMessageHandler, namespaces []string)

AddStructMessageHandler adds a new listener for Struct messages.

func (StructServer) AddStructSpeaker 

func (d StructServer) AddStructSpeaker(c *StructSpeaker)

func (*StructServer) OnConnected 

func (s *StructServer) OnConnected(c Speaker)

OnConnected websocket event.

func (*StructServer) OnDisconnected 

func (s *StructServer) OnDisconnected(c Speaker)

OnDisconnected removes the Speaker from the incomer pool.

func (*StructServer) OnMessage 

func (s *StructServer) OnMessage(c Speaker, m Message)

OnMessage websocket event.

func (*StructServer) Request 

func (s *StructServer) Request(host string, request *StructMessage, timeout time.Duration) (*StructMessage, error)

Request sends a Request Struct message to the Speaker of the given remote host.

type StructSpeaker 

type StructSpeaker struct {
	Speaker
	// contains filtered or unexported fields
}

StructSpeaker is a Speaker able to handle Struct Message and Request/Reply calls.

func (StructSpeaker) AddStructMessageHandler 

func (a StructSpeaker) AddStructMessageHandler(h SpeakerStructMessageHandler, namespaces []string)

AddStructMessageHandler adds a new listener for Struct messages.

func (StructSpeaker) OnConnected 

func (a StructSpeaker) OnConnected(c Speaker)

OnConnected is implemented here to avoid infinite loop since the default implementation is triggering OnDisconnected too.

func (StructSpeaker) OnDisconnected 

func (a StructSpeaker) OnDisconnected(c Speaker)

OnDisconnected is implemented here to avoid infinite loop since the default implementation is triggering OnDisconnected too.

func (*StructSpeaker) OnMessage 

func (s *StructSpeaker) OnMessage(c Speaker, m Message)

OnMessage checks that the Message comes from a StructSpeaker. It parses the Struct message and then dispatch the message to the proper listeners according to the namespace.

func (*StructSpeaker) Request 

func (s *StructSpeaker) Request(m *StructMessage, timeout time.Duration) (*StructMessage, error)

Request sends a Struct message request waiting for a reply using the given timeout.

func (*StructSpeaker) SendMessage 

func (s *StructSpeaker) SendMessage(m Message) error

SendMessage sends a message according to the namespace.

type StructSpeakerPool 

type StructSpeakerPool interface {
	SpeakerPool
	SpeakerStructMessageDispatcher
	Request(host string, request *StructMessage, timeout time.Duration) (*StructMessage, error)
}

StructSpeakerPool is the interface of a pool of StructSpeakers.

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