client

package
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 Go to latest Published: Feb 11, 2022 License: Apache-2.0 Imports: 44 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	XVersion           = "X-RPCX-Version"
	XMessageType       = "X-RPCX-MesssageType"
	XHeartbeat         = "X-RPCX-Heartbeat"
	XOneway            = "X-RPCX-Oneway"
	XMessageStatusType = "X-RPCX-MessageStatusType"
	XSerializeType     = "X-RPCX-SerializeType"
	XMessageID         = "X-RPCX-MessageID"
	XServicePath       = "X-RPCX-ServicePath"
	XServiceMethod     = "X-RPCX-ServiceMethod"
	XMeta              = "X-RPCX-Meta"
	XErrorMessage      = "X-RPCX-ErrorMessage"
)
View Source 
const (
	// ReaderBuffsize is used for bufio reader.
	ReaderBuffsize = 16 * 1024
	// WriterBuffsize is used for bufio writer.
	WriterBuffsize = 16 * 1024
)
View Source 
const (
	FileTransferBufferSize = 1024
)

Variables

View Source 
var (
	ErrBreakerOpen    = errors.New("breaker open")
	ErrBreakerTimeout = errors.New("breaker time out")
)
View Source 
var (
	ErrShutdown         = errors.New("connection is shut down")
	ErrUnsupportedCodec = errors.New("unsupported codec")
)

ErrShutdown connection is closed.

View Source 
var (
	// ErrXClientShutdown xclient is shutdown.
	ErrXClientShutdown = errors.New("xClient is shut down")
	// ErrXClientNoServer selector can't found one server.
	ErrXClientNoServer = errors.New("can not found any server")
	// ErrServerUnavailable selected server is unavailable.
	ErrServerUnavailable = errors.New("selected server is unavailable")
)
View Source 
var ConnFactories = map[string]ConnFactoryFn{
	"http": newDirectHTTPConn,
	"kcp":  newDirectKCPConn,
	"quic": newDirectQuicConn,
	"unix": newDirectConn,
	"memu": newMemuConn,
}
View Source 
var DefaultOption = Option{
	Retries:             3,
	RPCPath:             share.DefaultRPCPath,
	ConnectTimeout:      time.Second,
	SerializeType:       protocol.MsgPack,
	CompressType:        protocol.None,
	BackupLatency:       10 * time.Millisecond,
	MaxWaitForHeartbeat: 30 * time.Second,
	TCPKeepAlivePeriod:  time.Minute,
}

DefaultOption is a common option configuration for client.

Functions

func CalculateWeight 

func CalculateWeight(rtt int) int

CalculateWeight converts the rtt to weighted by:

  1. weight=191 if t <= 10
  2. weight=201 -t if 10 < t <=200
  3. weight=1 if 200 < t < 1000
  4. weight = 0 if t >= 1000

It means servers that ping time t < 10 will be preferred and servers won't be selected if t > 1000. It is hard coded based on Ops experience.

func Hash 

func Hash(key uint64, buckets int32) int32

Hash consistently chooses a hash bucket number in the range [0, numBuckets) for the given key. numBuckets must be >= 1.

func HashString 

func HashString(s string) uint64

HashString get a hash value of a string

func JumpConsistentHash 

func JumpConsistentHash(len int, options ...interface{}) int

JumpConsistentHash selects a server by serviceMethod and args

func Ping 

func Ping(host string) (rtt int, err error)

Ping gets network traffic by ICMP

func RegisterCacheClientBuilder 

func RegisterCacheClientBuilder(network string, builder CacheClientBuilder)

Types

type Breaker 

type Breaker interface {
	Call(func() error, time.Duration) error
	Fail()
	Success()
	Ready() bool
}

Breaker is a CircuitBreaker interface. 

var CircuitBreaker Breaker = circuit.NewRateBreaker(0.95, 100)

CircuitBreaker is a default circuit breaker (RateBreaker(0.95, 100)).

type CacheClientBuilder 

type CacheClientBuilder interface {
	SetCachedClient(client RPCClient, k, servicePath, serviceMethod string)
	FindCachedClient(k, servicePath, serviceMethod string) RPCClient
	DeleteCachedClient(client RPCClient, k, servicePath, serviceMethod string)
	GenerateClient(k, servicePath, serviceMethod string) (client RPCClient, err error)
}

CacheClientBuilder defines builder interface to generate RPCCient.

type Call 

type Call struct {
	ServicePath   string            // The name of the service and method to call.
	ServiceMethod string            // The name of the service and method to call.
	Metadata      map[string]string // metadata
	ResMetadata   map[string]string
	Args          interface{} // The argument to the function (*struct).
	Reply         interface{} // The reply from the function (*struct).
	Error         error       // After completion, the error status.
	Done          chan *Call  // Strobes when call is complete.
	Raw           bool        // raw message or not
}

Call represents an active RPC.

type Client 

type Client struct {
	Conn net.Conn

	Plugins PluginContainer

	ServerMessageChan chan<- *protocol.Message
	// contains filtered or unexported fields
}

Client represents a RPC client.

func NewClient 

func NewClient(option Option) *Client

NewClient returns a new Client with the option.

func (*Client) Call 

func (client *Client) Call(ctx context.Context, servicePath, serviceMethod string, args interface{}, reply interface{}) error

Call invokes the named function, waits for it to complete, and returns its error status.

func (*Client) Close 

func (client *Client) Close() error

Close calls the underlying connection's Close method. If the connection is already shutting down, ErrShutdown is returned.

func (*Client) Connect 

func (c *Client) Connect(network, address string) error

Connect connects the server via specified network.

func (*Client) GetConn 

func (c *Client) GetConn() net.Conn

GetConn returns the underlying conn.

func (*Client) Go 

func (client *Client) Go(ctx context.Context, servicePath, serviceMethod string, args interface{}, reply interface{}, done chan *Call) *Call

Go invokes the function asynchronously. It returns the Call structure representing the invocation. The done channel will signal when the call is complete by returning the same Call object. If done is nil, Go will allocate a new channel. If non-nil, done must be buffered or Go will deliberately crash.

func (*Client) IsClosing 

func (client *Client) IsClosing() bool

IsClosing client is closing or not.

func (*Client) IsShutdown 

func (client *Client) IsShutdown() bool

IsShutdown client is shutdown or not.

func (*Client) RegisterServerMessageChan 

func (client *Client) RegisterServerMessageChan(ch chan<- *protocol.Message)

RegisterServerMessageChan registers the channel that receives server requests.

func (*Client) RemoteAddr 

func (c *Client) RemoteAddr() string

RemoteAddr returns the remote address.

func (*Client) SendRaw 

func (client *Client) SendRaw(ctx context.Context, r *protocol.Message) (map[string]string, []byte, error)

SendRaw sends raw messages. You don't care args and replies.

func (*Client) UnregisterServerMessageChan 

func (client *Client) UnregisterServerMessageChan()

UnregisterServerMessageChan removes ServerMessageChan.

type ClientAfterDecodePlugin 

type ClientAfterDecodePlugin interface {
	ClientAfterDecode(*protocol.Message) error
}

ClientAfterDecodePlugin is invoked when the message is decoded.

type ClientBeforeEncodePlugin 

type ClientBeforeEncodePlugin interface {
	ClientBeforeEncode(*protocol.Message) error
}

ClientBeforeEncodePlugin is invoked when the message is encoded and sent.

type ClientConnectedPlugin 

type ClientConnectedPlugin interface {
	ClientConnected(net.Conn) (net.Conn, error)
}

ClientConnectedPlugin is invoked when the client has connected the server.

type ClientConnectionClosePlugin 

type ClientConnectionClosePlugin interface {
	ClientConnectionClose(net.Conn) error
}

ClientConnectionClosePlugin is invoked when the connection is closing.

type ConnCreatedPlugin 

type ConnCreatedPlugin interface {
	ConnCreated(net.Conn) (net.Conn, error)
}

ConnCreatedPlugin is invoked when the client connection has created.

type ConnFactoryFn 

type ConnFactoryFn func(c *Client, network, address string) (net.Conn, error)

type ConsecCircuitBreaker 

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

ConsecCircuitBreaker is window sliding CircuitBreaker with failure threshold.

func NewConsecCircuitBreaker 

func NewConsecCircuitBreaker(failureThreshold uint64, window time.Duration) *ConsecCircuitBreaker

NewConsecCircuitBreaker returns a new ConsecCircuitBreaker.

func (*ConsecCircuitBreaker) Call 

func (cb *ConsecCircuitBreaker) Call(fn func() error, d time.Duration) error

Call Circuit function

func (*ConsecCircuitBreaker) Fail 

func (cb *ConsecCircuitBreaker) Fail()

func (*ConsecCircuitBreaker) Ready 

func (cb *ConsecCircuitBreaker) Ready() bool

func (*ConsecCircuitBreaker) Success 

func (cb *ConsecCircuitBreaker) Success()

type ConsistentAddrStrFunction 

type ConsistentAddrStrFunction func(options ...interface{}) string

ConsistentFunction define a hash function Return service address, like "tcp@127.0.0.1:8970"

type ConsulDiscovery 

type ConsulDiscovery struct {

	// -1 means it always retry to watch until zookeeper is ok, 0 means no retry.
	RetriesAfterWatchFailed int
	// contains filtered or unexported fields
}

ConsulDiscovery is a consul service discovery. It always returns the registered servers in consul.

func NewConsulDiscovery 

func NewConsulDiscovery(basePath, servicePath string, consulAddr []string, options *store.Config) (*ConsulDiscovery, error)

NewConsulDiscovery returns a new ConsulDiscovery.

func NewConsulDiscoveryStore 

func NewConsulDiscoveryStore(basePath string, kv store.Store) (*ConsulDiscovery, error)

NewConsulDiscoveryStore returns a new ConsulDiscovery with specified store.

func NewConsulDiscoveryTemplate 

func NewConsulDiscoveryTemplate(basePath string, consulAddr []string, options *store.Config) (*ConsulDiscovery, error)

NewConsulDiscoveryTemplate returns a new ConsulDiscovery template.

func (*ConsulDiscovery) Clone 

func (d *ConsulDiscovery) Clone(servicePath string) (ServiceDiscovery, error)

Clone clones this ServiceDiscovery with new servicePath.

func (*ConsulDiscovery) Close 

func (d *ConsulDiscovery) Close()

func (*ConsulDiscovery) GetServices 

func (d *ConsulDiscovery) GetServices() []*KVPair

GetServices returns the servers

func (*ConsulDiscovery) RemoveWatcher 

func (d *ConsulDiscovery) RemoveWatcher(ch chan []*KVPair)

func (*ConsulDiscovery) SetFilter 

func (d *ConsulDiscovery) SetFilter(filter ServiceDiscoveryFilter)

SetFilter sets the filer.

func (*ConsulDiscovery) WatchService 

func (d *ConsulDiscovery) WatchService() chan []*KVPair

WatchService returns a nil chan.

type DNSDiscovery 

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

DNSDiscovery is based on DNS a record. You must set port and network info when you create the DNSDiscovery.

func NewDNSDiscovery 

func NewDNSDiscovery(domain string, network string, port int, d time.Duration) (*DNSDiscovery, error)

NewPeer2PeerDiscovery returns a new Peer2PeerDiscovery.

func (*DNSDiscovery) Clone 

func (d *DNSDiscovery) Clone(servicePath string) (ServiceDiscovery, error)

Clone clones this ServiceDiscovery with new servicePath.

func (*DNSDiscovery) Close 

func (d *DNSDiscovery) Close()

func (*DNSDiscovery) GetServices 

func (d *DNSDiscovery) GetServices() []*KVPair

GetServices returns the static server

func (*DNSDiscovery) RemoveWatcher 

func (d *DNSDiscovery) RemoveWatcher(ch chan []*KVPair)

func (*DNSDiscovery) SetFilter 

func (d *DNSDiscovery) SetFilter(filter ServiceDiscoveryFilter)

SetFilter sets the filer.

func (*DNSDiscovery) WatchService 

func (d *DNSDiscovery) WatchService() chan []*KVPair

WatchService returns a nil chan.

type FailMode 

type FailMode int

FailMode decides how clients action when clients fail to invoke services 

const (
	//Failover selects another server automaticaly
	Failover FailMode = iota
	//Failfast returns error immediately
	Failfast
	//Failtry use current client again
	Failtry
	//Failbackup select another server if the first server doesn't respond in specified time and use the fast response.
	Failbackup
)

func FailModeString 

func FailModeString(s string) (FailMode, error)

FailModeString retrieves an enum value from the enum constants string name. Throws an error if the param is not part of the enum.

func FailModeValues 

func FailModeValues() []FailMode

FailModeValues returns all values of the enum

func (FailMode) IsAFailMode 

func (i FailMode) IsAFailMode() bool

IsAFailMode returns "true" if the value is listed in the enum definition. "false" otherwise

func (FailMode) String 

func (i FailMode) String() string

type HashServiceAndArgs 

type HashServiceAndArgs func(len int, options ...interface{}) int

HashServiceAndArgs define a hash function

type KVPair 

type KVPair struct {
	Key   string
	Value string
}

KVPair contains a key and a string.

type MDNSDiscovery 

type MDNSDiscovery struct {
	Timeout       time.Duration
	WatchInterval time.Duration
	// contains filtered or unexported fields
}

MDNSDiscovery is a mdns service discovery. It always returns the registered servers in etcd.

func NewMDNSDiscovery 

func NewMDNSDiscovery(service string, timeout time.Duration, watchInterval time.Duration, domain string) (*MDNSDiscovery, error)

NewMDNSDiscovery returns a new MDNSDiscovery. If domain is empty, use "local." in default.

func (*MDNSDiscovery) Clone 

func (d *MDNSDiscovery) Clone(servicePath string) (ServiceDiscovery, error)

Clone clones this ServiceDiscovery with new servicePath.

func (*MDNSDiscovery) Close 

func (d *MDNSDiscovery) Close()

func (*MDNSDiscovery) GetServices 

func (d *MDNSDiscovery) GetServices() []*KVPair

GetServices returns the servers

func (*MDNSDiscovery) RemoveWatcher 

func (d *MDNSDiscovery) RemoveWatcher(ch chan []*KVPair)

func (*MDNSDiscovery) SetFilter 

func (d *MDNSDiscovery) SetFilter(filter ServiceDiscoveryFilter)

SetFilter sets the filer.

func (*MDNSDiscovery) WatchService 

func (d *MDNSDiscovery) WatchService() chan []*KVPair

WatchService returns a nil chan.

type MultipleServersDiscovery 

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

MultipleServersDiscovery is a multiple servers service discovery. It always returns the current servers and uses can change servers dynamically.

func NewMultipleServersDiscovery 

func NewMultipleServersDiscovery(pairs []*KVPair) (*MultipleServersDiscovery, error)

NewMultipleServersDiscovery returns a new MultipleServersDiscovery.

func (*MultipleServersDiscovery) Clone 

func (d *MultipleServersDiscovery) Clone(servicePath string) (ServiceDiscovery, error)

Clone clones this ServiceDiscovery with new servicePath.

func (*MultipleServersDiscovery) Close 

func (d *MultipleServersDiscovery) Close()

func (*MultipleServersDiscovery) GetServices 

func (d *MultipleServersDiscovery) GetServices() []*KVPair

GetServices returns the configured server

func (*MultipleServersDiscovery) RemoveWatcher 

func (d *MultipleServersDiscovery) RemoveWatcher(ch chan []*KVPair)

func (*MultipleServersDiscovery) SetFilter 

func (d *MultipleServersDiscovery) SetFilter(filter ServiceDiscoveryFilter)

SetFilter sets the filer.

func (*MultipleServersDiscovery) Update 

func (d *MultipleServersDiscovery) Update(pairs []*KVPair)

Update is used to update servers at runtime.

func (*MultipleServersDiscovery) WatchService 

func (d *MultipleServersDiscovery) WatchService() chan []*KVPair

WatchService returns a nil chan.

type OneClient 

type OneClient struct {
	Plugins PluginContainer
	// contains filtered or unexported fields
}

OneClient wraps servicesPath and XClients. Users can use a shared oneclient to access multiple services.

func NewBidirectionalOneClient 

func NewBidirectionalOneClient(failMode FailMode, selectMode SelectMode, discovery ServiceDiscovery, option Option, serverMessageChan chan<- *protocol.Message) *OneClient

NewBidirectionalOneClient creates a new xclient that can receive notifications from servers.

func NewOneClient 

func NewOneClient(failMode FailMode, selectMode SelectMode, discovery ServiceDiscovery, option Option) *OneClient

NewOneClient creates a OneClient that supports service discovery and service governance.

func (*OneClient) Auth 

func (c *OneClient) Auth(auth string)

Auth sets s token for Authentication.

func (*OneClient) Broadcast 

func (c *OneClient) Broadcast(ctx context.Context, servicePath string, serviceMethod string, args interface{}, reply interface{}) error

Broadcast sends requests to all servers and Success only when all servers return OK. FailMode and SelectMode are meanless for this method. Please set timeout to avoid hanging.

func (*OneClient) Call 

func (c *OneClient) Call(ctx context.Context, servicePath string, serviceMethod string, args interface{}, reply interface{}) error

Call invokes the named function, waits for it to complete, and returns its error status. It handles errors base on FailMode.

func (*OneClient) Close 

func (c *OneClient) Close() error

Close closes all xclients and its underlying connections to services.

func (*OneClient) ConfigGeoSelector 

func (c *OneClient) ConfigGeoSelector(latitude, longitude float64)

ConfigGeoSelector sets location of client's latitude and longitude, and use newGeoSelector.

func (*OneClient) DownloadFile 

func (c *OneClient) DownloadFile(ctx context.Context, requestFileName string, saveTo io.Writer, meta map[string]string) error

func (*OneClient) Fork 

func (c *OneClient) Fork(ctx context.Context, servicePath string, serviceMethod string, args interface{}, reply interface{}) error

Fork sends requests to all servers and Success once one server returns OK. FailMode and SelectMode are meanless for this method.

func (*OneClient) GetPlugins 

func (c *OneClient) GetPlugins() PluginContainer

func (*OneClient) Go 

func (c *OneClient) Go(ctx context.Context, servicePath string, serviceMethod string, args interface{}, reply interface{}, done chan *Call) (*Call, error)

Go invokes the function asynchronously. It returns the Call structure representing the invocation. The done channel will signal when the call is complete by returning the same Call object. If done is nil, Go will allocate a new channel. If non-nil, done must be buffered or Go will deliberately crash. It does not use FailMode.

func (*OneClient) SendFile 

func (c *OneClient) SendFile(ctx context.Context, fileName string, rateInBytesPerSecond int64, meta map[string]string) error

func (*OneClient) SendRaw 

func (c *OneClient) SendRaw(ctx context.Context, r *protocol.Message) (map[string]string, []byte, error)

func (*OneClient) SetPlugins 

func (c *OneClient) SetPlugins(plugins PluginContainer)

SetPlugins sets client's plugins.

func (*OneClient) SetSelector 

func (c *OneClient) SetSelector(servicePath string, s Selector)

SetSelector sets customized selector by users.

func (*OneClient) Stream 

func (c *OneClient) Stream(ctx context.Context, meta map[string]string) (net.Conn, error)

type OneClientPool 

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

OneClientPool is a oneclient pool with fixed size. It uses roundrobin algorithm to call its xclients. All oneclients share the same configurations such as ServiceDiscovery and serverMessageChan.

func NewBidirectionalOneClientPool 

func NewBidirectionalOneClientPool(count int, failMode FailMode, selectMode SelectMode, discovery ServiceDiscovery, option Option, serverMessageChan chan<- *protocol.Message) *OneClientPool

NewBidirectionalOneClientPool creates a BidirectionalOneClient pool with fixed size.

func NewOneClientPool 

func NewOneClientPool(count int, failMode FailMode, selectMode SelectMode, discovery ServiceDiscovery, option Option) *OneClientPool

NewOneClientPool creates a fixed size OneClient pool.

func (*OneClientPool) Auth 

func (c *OneClientPool) Auth(auth string)

Auth sets s token for Authentication.

func (OneClientPool) Close 

func (p OneClientPool) Close()

Close this pool. Please make sure it won't be used any more.

func (*OneClientPool) Get 

func (p *OneClientPool) Get() *OneClient

Get returns a OneClient. It does not remove this OneClient from its cache so you don't need to put it back. Don't close this OneClient because maybe other goroutines are using this OneClient.

type OpenTelemetryPlugin 

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

func NewOpenTelemetryPlugin 

func NewOpenTelemetryPlugin(tracer trace.Tracer, propagators propagation.TextMapPropagator) *OpenTelemetryPlugin

func (*OpenTelemetryPlugin) PostCall 

func (p *OpenTelemetryPlugin) PostCall(ctx context.Context, servicePath, serviceMethod string, args interface{}, reply interface{}, err error) error

func (*OpenTelemetryPlugin) PreCall 

func (p *OpenTelemetryPlugin) PreCall(ctx context.Context, servicePath, serviceMethod string, args interface{}) error

type Option 

type Option struct {
	// Group is used to select the services in the same group. Services set group info in their meta.
	// If it is empty, clients will ignore group.
	Group string

	// Retries retries to send
	Retries int

	// TLSConfig for tcp and quic
	TLSConfig *tls.Config
	// kcp.BlockCrypt
	Block interface{}
	// RPCPath for http connection
	RPCPath string
	// ConnectTimeout sets timeout for dialing
	ConnectTimeout time.Duration
	// IdleTimeout sets max idle time for underlying net.Conns
	IdleTimeout time.Duration

	// BackupLatency is used for Failbackup mode. flare will sends another request if the first response doesn't return in BackupLatency time.
	BackupLatency time.Duration

	// Breaker is used to config CircuitBreaker
	GenBreaker func() Breaker

	SerializeType protocol.SerializeType
	CompressType  protocol.CompressType

	// send heartbeat message to service and check responses
	Heartbeat bool
	// interval for heartbeat
	HeartbeatInterval   time.Duration
	MaxWaitForHeartbeat time.Duration

	// TCPKeepAlive, if it is zero we don't set keepalive
	TCPKeepAlivePeriod time.Duration
}

Option contains all options for creating clients.

type Peer2PeerDiscovery 

type Peer2PeerDiscovery struct {
	// contains filtered or unexported fields
}

Peer2PeerDiscovery is a peer-to-peer service discovery. It always returns the static server.

func NewPeer2PeerDiscovery 

func NewPeer2PeerDiscovery(server, metadata string) (*Peer2PeerDiscovery, error)

NewPeer2PeerDiscovery returns a new Peer2PeerDiscovery.

func (*Peer2PeerDiscovery) Clone 

func (d *Peer2PeerDiscovery) Clone(servicePath string) (ServiceDiscovery, error)

Clone clones this ServiceDiscovery with new servicePath.

func (*Peer2PeerDiscovery) Close 

func (d *Peer2PeerDiscovery) Close()

func (*Peer2PeerDiscovery) GetServices 

func (d *Peer2PeerDiscovery) GetServices() []*KVPair

GetServices returns the static server

func (*Peer2PeerDiscovery) RemoveWatcher 

func (d *Peer2PeerDiscovery) RemoveWatcher(ch chan []*KVPair)

func (*Peer2PeerDiscovery) SetFilter 

func (d *Peer2PeerDiscovery) SetFilter(filter ServiceDiscoveryFilter)

SetFilter sets the filer.

func (*Peer2PeerDiscovery) WatchService 

func (d *Peer2PeerDiscovery) WatchService() chan []*KVPair

WatchService returns a nil chan.

type Plugin 

type Plugin interface {
}

Plugin is the client plugin interface.

type PluginContainer 

type PluginContainer interface {
	Add(plugin Plugin)
	Remove(plugin Plugin)
	All() []Plugin

	DoConnCreated(net.Conn) (net.Conn, error)
	DoClientConnected(net.Conn) (net.Conn, error)
	DoClientConnectionClose(net.Conn) error

	DoPreCall(ctx context.Context, servicePath, serviceMethod string, args interface{}) error
	DoPostCall(ctx context.Context, servicePath, serviceMethod string, args interface{}, reply interface{}, err error) error

	DoClientBeforeEncode(*protocol.Message) error
	DoClientAfterDecode(*protocol.Message) error

	DoWrapSelect(SelectFunc) SelectFunc
}

PluginContainer represents a plugin container that defines all methods to manage plugins. And it also defines all extension points.

func NewPluginContainer 

func NewPluginContainer() PluginContainer

type PostCallPlugin 

type PostCallPlugin interface {
	PostCall(ctx context.Context, servicePath, serviceMethod string, args interface{}, reply interface{}, err error) error
}

PostCallPlugin is invoked after the client calls a server.

type PreCallPlugin 

type PreCallPlugin interface {
	PreCall(ctx context.Context, servicePath, serviceMethod string, args interface{}) error
}

PreCallPlugin is invoked before the client calls a server.

type RPCClient 

type RPCClient interface {
	Connect(network, address string) error
	Go(ctx context.Context, servicePath, serviceMethod string, args interface{}, reply interface{}, done chan *Call) *Call
	Call(ctx context.Context, servicePath, serviceMethod string, args interface{}, reply interface{}) error
	SendRaw(ctx context.Context, r *protocol.Message) (map[string]string, []byte, error)
	Close() error
	RemoteAddr() string

	RegisterServerMessageChan(ch chan<- *protocol.Message)
	UnregisterServerMessageChan()

	IsClosing() bool
	IsShutdown() bool

	GetConn() net.Conn
}

RPCClient is interface that defines one client to call one server.

type Receipt 

type Receipt struct {
	Address string
	Reply   interface{}
	Error   error
}

Receipt represents the result of the service returned.

type RedisDiscovery 

type RedisDiscovery struct {

	// -1 means it always retry to watch until zookeeper is ok, 0 means no retry.
	RetriesAfterWatchFailed int
	// contains filtered or unexported fields
}

RedisDiscovery is a redis service discovery. It always returns the registered servers in redis.

func NewRedisDiscovery 

func NewRedisDiscovery(basePath string, servicePath string, redisAddr []string, options *store.Config) (*RedisDiscovery, error)

NewRedisDiscovery returns a new RedisDiscovery.

func NewRedisDiscoveryStore 

func NewRedisDiscoveryStore(basePath string, kv store.Store) (*RedisDiscovery, error)

NewRedisDiscoveryStore return a new RedisDiscovery with specified store.

func NewRedisDiscoveryTemplate 

func NewRedisDiscoveryTemplate(basePath string, etcdAddr []string, options *store.Config) (*RedisDiscovery, error)

NewRedisDiscoveryTemplate returns a new RedisDiscovery template.

func (*RedisDiscovery) Clone 

func (d *RedisDiscovery) Clone(servicePath string) (ServiceDiscovery, error)

Clone clones this ServiceDiscovery with new servicePath.

func (*RedisDiscovery) Close 

func (d *RedisDiscovery) Close()

func (*RedisDiscovery) GetServices 

func (d *RedisDiscovery) GetServices() []*KVPair

GetServices returns the servers

func (*RedisDiscovery) RemoveWatcher 

func (d *RedisDiscovery) RemoveWatcher(ch chan []*KVPair)

func (*RedisDiscovery) SetFilter 

func (d *RedisDiscovery) SetFilter(filter ServiceDiscoveryFilter)

SetFilter sets the filer.

func (*RedisDiscovery) WatchService 

func (d *RedisDiscovery) WatchService() chan []*KVPair

WatchService returns a nil chan.

type SelectFunc 

type SelectFunc func(ctx context.Context, servicePath, serviceMethod string, args interface{}) string

type SelectMode 

type SelectMode int

SelectMode defines the algorithm of selecting a services from candidates. 

const (
	//RandomSelect is selecting randomly
	RandomSelect SelectMode = iota
	//RoundRobin is selecting by round robin
	RoundRobin
	//WeightedRoundRobin is selecting by weighted round robin
	WeightedRoundRobin
	//WeightedICMP is selecting by weighted Ping time
	WeightedICMP
	//ConsistentHash is selecting by hashing
	ConsistentHash
	//Closest is selecting the closest server
	Closest

	// SelectByUser is selecting by implementation of users
	SelectByUser = 1000
)

func SelectModeString 

func SelectModeString(s string) (SelectMode, error)

SelectModeString retrieves an enum value from the enum constants string name. Throws an error if the param is not part of the enum.

func SelectModeValues 

func SelectModeValues() []SelectMode

SelectModeValues returns all values of the enum

func (SelectMode) IsASelectMode 

func (i SelectMode) IsASelectMode() bool

IsASelectMode returns "true" if the value is listed in the enum definition. "false" otherwise

func (SelectMode) String 

func (i SelectMode) String() string

type SelectNodePlugin 

type SelectNodePlugin interface {
	WrapSelect(SelectFunc) SelectFunc
}

SelectNodePlugin can interrupt selecting of xclient and add customized logics such as skipping some nodes.

type Selector 

type Selector interface {
	Select(ctx context.Context, servicePath, serviceMethod string, args interface{}) string // SelectFunc
	UpdateServer(servers map[string]string)
}

Selector defines selector that selects one service from candidates.

type ServiceDiscovery 

type ServiceDiscovery interface {
	GetServices() []*KVPair
	WatchService() chan []*KVPair
	RemoveWatcher(ch chan []*KVPair)
	Clone(servicePath string) (ServiceDiscovery, error)
	SetFilter(ServiceDiscoveryFilter)
	Close()
}

ServiceDiscovery defines ServiceDiscovery of zookeeper, etcd and consul

type ServiceDiscoveryFilter 

type ServiceDiscoveryFilter func(kvp *KVPair) bool

ServiceDiscoveryFilter can be used to filter services with customized logics. Servers can register its services but clients can use the customized filter to select some services. It returns true if ServiceDiscovery wants to use this service, otherwise it returns false.

type ServiceError 

type ServiceError string

ServiceError is an error from server.

func (ServiceError) Error 

func (e ServiceError) Error() string

type Weighted 

type Weighted struct {
	Server          string
	Weight          int
	CurrentWeight   int
	EffectiveWeight int
}

Weighted is a wrapped server with weight

type XClient 

type XClient interface {
	SetPlugins(plugins PluginContainer)
	GetPlugins() PluginContainer
	SetSelector(s Selector)
	ConfigGeoSelector(latitude, longitude float64)
	Auth(auth string)

	Go(ctx context.Context, serviceMethod string, args interface{}, reply interface{}, done chan *Call) (*Call, error)
	Call(ctx context.Context, serviceMethod string, args interface{}, reply interface{}) error
	Broadcast(ctx context.Context, serviceMethod string, args interface{}, reply interface{}) error
	Fork(ctx context.Context, serviceMethod string, args interface{}, reply interface{}) error
	Inform(ctx context.Context, serviceMethod string, args interface{}, reply interface{}) ([]Receipt, error)
	SendRaw(ctx context.Context, r *protocol.Message) (map[string]string, []byte, error)
	SendFile(ctx context.Context, fileName string, rateInBytesPerSecond int64, meta map[string]string) error
	DownloadFile(ctx context.Context, requestFileName string, saveTo io.Writer, meta map[string]string) error
	Stream(ctx context.Context, meta map[string]string) (net.Conn, error)
	Close() error
}

XClient is an interface that used by client with service discovery and service governance. One XClient is used only for one service. You should create multiple XClient for multiple services.

func NewBidirectionalXClient 

func NewBidirectionalXClient(servicePath string, failMode FailMode, selectMode SelectMode, discovery ServiceDiscovery, option Option, serverMessageChan chan<- *protocol.Message) XClient

NewBidirectionalXClient creates a new xclient that can receive notifications from servers.

func NewXClient 

func NewXClient(servicePath string, failMode FailMode, selectMode SelectMode, discovery ServiceDiscovery, option Option) XClient

NewXClient creates a XClient that supports service discovery and service governance.

type XClientPool 

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

XClientPool is a xclient pool with fixed size. It uses roundrobin algorithm to call its xclients. All xclients share the same configurations such as ServiceDiscovery and serverMessageChan.

func NewBidirectionalXClientPool 

func NewBidirectionalXClientPool(count int, servicePath string, failMode FailMode, selectMode SelectMode, discovery ServiceDiscovery, option Option, serverMessageChan chan<- *protocol.Message) *XClientPool

NewBidirectionalXClientPool creates a BidirectionalXClient pool with fixed size.

func NewXClientPool 

func NewXClientPool(count int, servicePath string, failMode FailMode, selectMode SelectMode, discovery ServiceDiscovery, option Option) *XClientPool

NewXClientPool creates a fixed size XClient pool.

func (*XClientPool) Auth 

func (c *XClientPool) Auth(auth string)

Auth sets s token for Authentication.

func (*XClientPool) Close 

func (p *XClientPool) Close()

Close this pool. Please make sure it won't be used any more.

func (*XClientPool) Get 

func (p *XClientPool) Get() XClient

Get returns a xclient. It does not remove this xclient from its cache so you don't need to put it back. Don't close this xclient because maybe other goroutines are using this xclient.

type ZookeeperDiscovery 

type ZookeeperDiscovery struct {

	// -1 means it always retry to watch until zookeeper is ok, 0 means no retry.
	RetriesAfterWatchFailed int
	// contains filtered or unexported fields
}

ZookeeperDiscovery is a zoopkeer service discovery. It always returns the registered servers in zookeeper.

func NewZookeeperDiscovery 

func NewZookeeperDiscovery(basePath string, servicePath string, zkAddr []string, options *store.Config) (*ZookeeperDiscovery, error)

NewZookeeperDiscovery returns a new ZookeeperDiscovery.

func NewZookeeperDiscoveryTemplate 

func NewZookeeperDiscoveryTemplate(basePath string, zkAddr []string, options *store.Config) (*ZookeeperDiscovery, error)

NewZookeeperDiscoveryTemplate returns a new ZookeeperDiscovery template.

func NewZookeeperDiscoveryWithStore 

func NewZookeeperDiscoveryWithStore(basePath string, kv store.Store) (*ZookeeperDiscovery, error)

NewZookeeperDiscoveryWithStore returns a new ZookeeperDiscovery with specified store.

func (*ZookeeperDiscovery) Clone 

func (d *ZookeeperDiscovery) Clone(servicePath string) (ServiceDiscovery, error)

Clone clones this ServiceDiscovery with new servicePath.

func (*ZookeeperDiscovery) Close 

func (d *ZookeeperDiscovery) Close()

func (*ZookeeperDiscovery) GetServices 

func (d *ZookeeperDiscovery) GetServices() []*KVPair

GetServices returns the servers

func (*ZookeeperDiscovery) RemoveWatcher 

func (d *ZookeeperDiscovery) RemoveWatcher(ch chan []*KVPair)

func (*ZookeeperDiscovery) SetFilter 

func (d *ZookeeperDiscovery) SetFilter(filter ServiceDiscoveryFilter)

SetFilter sets the filer.

func (*ZookeeperDiscovery) WatchService 

func (d *ZookeeperDiscovery) WatchService() chan []*KVPair

WatchService returns a nil chan.

Source Files

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