consul

package
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Published: Oct 29, 2015 License: MPL-2.0 Imports: 37 Imported by: 0

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Index

Constants

View Source
const (
	DefaultDC          = "dc1"
	DefaultLANSerfPort = 8301
	DefaultWANSerfPort = 8302
)
View Source
const (
	SerfCheckID           = "serfHealth"
	SerfCheckName         = "Serf Health Status"
	SerfCheckAliveOutput  = "Agent alive and reachable"
	SerfCheckFailedOutput = "Agent not live or unreachable"
	ConsulServiceID       = "consul"
	ConsulServiceName     = "consul"
)
View Source
const (
	ProtocolVersionMin uint8 = 1

	// Version 3 added support for network coordinates but we kept the
	// default protocol version at 2 to ease the transition to this new
	// feature. A Consul agent speaking version 2 of the protocol will
	// attempt to send its coordinates to a server who understands version
	// 3 or greater.
	ProtocolVersion2Compatible = 2

	ProtocolVersionMax = 3
)

These are the protocol versions that Consul can _understand_. These are Consul-level protocol versions, that are used to configure the Serf protocol versions.

View Source
const (
	// StatusReap is used to update the status of a node if we
	// are handling a EventMemberReap
	StatusReap = serf.MemberStatus(-1)
)

Variables

View Source
var (
	DefaultRPCAddr = &net.TCPAddr{IP: net.ParseIP("0.0.0.0"), Port: 8300}
)

Functions

func CanServersUnderstandProtocol added in v0.6.0

func CanServersUnderstandProtocol(members []serf.Member, version uint8) (bool, error)

CanServersUnderstandProtocol checks to see if all the servers in the given list understand the given protocol version. If there are no servers in the list then this will return false.

func FilterDirEnt added in v0.4.0

func FilterDirEnt(acl acl.ACL, ent structs.DirEntries) structs.DirEntries

FilterDirEnt is used to filter a list of directory entries by applying an ACL policy

func FilterEntries added in v0.4.0

func FilterEntries(f Filter) int

FilterEntries is used to do an inplace filter of a slice. This has cost proportional to the list length.

func FilterKeys added in v0.4.0

func FilterKeys(acl acl.ACL, keys []string) []string

FilterKeys is used to filter a list of keys by applying an ACL policy

func GetPrivateIP

func GetPrivateIP() (net.IP, error)

GetPrivateIP is used to return the first private IP address associated with an interface on the machine

func NewFSM

func NewFSM(gc *state.TombstoneGC, logOutput io.Writer) (*consulFSM, error)

NewFSMPath is used to construct a new FSM with a blank state

func ToLowerList added in v0.4.0

func ToLowerList(l []string) []string

Types

type ACL added in v0.4.0

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

ACL endpoint is used to manipulate ACLs

func (*ACL) Apply added in v0.4.0

func (a *ACL) Apply(args *structs.ACLRequest, reply *string) error

Apply is used to apply a modifying request to the data store. This should only be used for operations that modify the data

func (*ACL) Get added in v0.4.0

func (a *ACL) Get(args *structs.ACLSpecificRequest,
	reply *structs.IndexedACLs) error

Get is used to retrieve a single ACL

func (*ACL) GetPolicy added in v0.4.0

func (a *ACL) GetPolicy(args *structs.ACLPolicyRequest, reply *structs.ACLPolicy) error

GetPolicy is used to retrieve a compiled policy object with a TTL. Does not support a blocking query.

func (*ACL) List added in v0.4.0

func (a *ACL) List(args *structs.DCSpecificRequest,
	reply *structs.IndexedACLs) error

List is used to list all the ACLs

type Catalog

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

Catalog endpoint is used to manipulate the service catalog

func (*Catalog) Deregister

func (c *Catalog) Deregister(args *structs.DeregisterRequest, reply *struct{}) error

Deregister is used to remove a service registration for a given node.

func (*Catalog) ListDatacenters

func (c *Catalog) ListDatacenters(args *struct{}, reply *[]string) error

ListDatacenters is used to query for the list of known datacenters

func (*Catalog) ListNodes

func (c *Catalog) ListNodes(args *structs.DCSpecificRequest, reply *structs.IndexedNodes) error

ListNodes is used to query the nodes in a DC

func (*Catalog) ListServices

func (c *Catalog) ListServices(args *structs.DCSpecificRequest, reply *structs.IndexedServices) error

ListServices is used to query the services in a DC

func (*Catalog) NodeServices

func (c *Catalog) NodeServices(args *structs.NodeSpecificRequest, reply *structs.IndexedNodeServices) error

NodeServices returns all the services registered as part of a node

func (*Catalog) Register

func (c *Catalog) Register(args *structs.RegisterRequest, reply *struct{}) error

Register is used register that a node is providing a given service.

func (*Catalog) ServiceNodes

func (c *Catalog) ServiceNodes(args *structs.ServiceSpecificRequest, reply *structs.IndexedServiceNodes) error

ServiceNodes returns all the nodes registered as part of a service

type Client

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

Client is Consul client which uses RPC to communicate with the services for service discovery, health checking, and DC forwarding.

func NewClient

func NewClient(config *Config) (*Client, error)

NewClient is used to construct a new Consul client from the configuration, potentially returning an error

func (*Client) Encrypted added in v0.5.0

func (c *Client) Encrypted() bool

Encrypted determines if gossip is encrypted

func (*Client) GetCoordinate added in v0.6.0

func (c *Client) GetCoordinate() (*coordinate.Coordinate, error)

GetCoordinate returns the network coordinate of the current node, as maintained by Serf.

func (*Client) JoinLAN

func (c *Client) JoinLAN(addrs []string) (int, error)

JoinLAN is used to have Consul client join the inner-DC pool The target address should be another node inside the DC listening on the Serf LAN address

func (*Client) KeyManagerLAN added in v0.5.0

func (c *Client) KeyManagerLAN() *serf.KeyManager

KeyManagerLAN returns the LAN Serf keyring manager

func (*Client) LANMembers

func (c *Client) LANMembers() []serf.Member

LANMembers is used to return the members of the LAN cluster

func (*Client) Leave

func (c *Client) Leave() error

Leave is used to prepare for a graceful shutdown

func (*Client) LocalMember added in v0.3.0

func (c *Client) LocalMember() serf.Member

LocalMember is used to return the local node

func (*Client) RPC

func (c *Client) RPC(method string, args interface{}, reply interface{}) error

RPC is used to forward an RPC call to a consul server, or fail if no servers

func (*Client) RemoveFailedNode

func (c *Client) RemoveFailedNode(node string) error

RemoveFailedNode is used to remove a failed node from the cluster

func (*Client) Shutdown

func (c *Client) Shutdown() error

Shutdown is used to shutdown the client

func (*Client) Stats

func (c *Client) Stats() map[string]map[string]string

Stats is used to return statistics for debugging and insight for various sub-systems

type Config

type Config struct {
	// Bootstrap mode is used to bring up the first Consul server.
	// It is required so that it can elect a leader without any
	// other nodes being present
	Bootstrap bool

	// BootstrapExpect mode is used to automatically bring up a collection of
	// Consul servers. This can be used to automatically bring up a collection
	// of nodes.
	BootstrapExpect int

	// Datacenter is the datacenter this Consul server represents
	Datacenter string

	// DataDir is the directory to store our state in
	DataDir string

	// Node name is the name we use to advertise. Defaults to hostname.
	NodeName string

	// Domain is the DNS domain for the records. Defaults to "consul."
	Domain string

	// RaftConfig is the configuration used for Raft in the local DC
	RaftConfig *raft.Config

	// RPCAddr is the RPC address used by Consul. This should be reachable
	// by the WAN and LAN
	RPCAddr *net.TCPAddr

	// RPCAdvertise is the address that is advertised to other nodes for
	// the RPC endpoint. This can differ from the RPC address, if for example
	// the RPCAddr is unspecified "0.0.0.0:8300", but this address must be
	// reachable
	RPCAdvertise *net.TCPAddr

	// SerfLANConfig is the configuration for the intra-dc serf
	SerfLANConfig *serf.Config

	// SerfWANConfig is the configuration for the cross-dc serf
	SerfWANConfig *serf.Config

	// ReconcileInterval controls how often we reconcile the strongly
	// consistent store with the Serf info. This is used to handle nodes
	// that are force removed, as well as intermittent unavailability during
	// leader election.
	ReconcileInterval time.Duration

	// LogOutput is the location to write logs to. If this is not set,
	// logs will go to stderr.
	LogOutput io.Writer

	// ProtocolVersion is the protocol version to speak. This must be between
	// ProtocolVersionMin and ProtocolVersionMax.
	ProtocolVersion uint8

	// VerifyIncoming is used to verify the authenticity of incoming connections.
	// This means that TCP requests are forbidden, only allowing for TLS. TLS connections
	// must match a provided certificate authority. This can be used to force client auth.
	VerifyIncoming bool

	// VerifyOutgoing is used to verify the authenticity of outgoing connections.
	// This means that TLS requests are used, and TCP requests are not made. TLS connections
	// must match a provided certificate authority. This is used to verify authenticity of
	// server nodes.
	VerifyOutgoing bool

	// VerifyServerHostname is used to enable hostname verification of servers. This
	// ensures that the certificate presented is valid for server.<datacenter>.<domain>.
	// This prevents a compromised client from being restarted as a server, and then
	// intercepting request traffic as well as being added as a raft peer. This should be
	// enabled by default with VerifyOutgoing, but for legacy reasons we cannot break
	// existing clients.
	VerifyServerHostname bool

	// CAFile is a path to a certificate authority file. This is used with VerifyIncoming
	// or VerifyOutgoing to verify the TLS connection.
	CAFile string

	// CertFile is used to provide a TLS certificate that is used for serving TLS connections.
	// Must be provided to serve TLS connections.
	CertFile string

	// KeyFile is used to provide a TLS key that is used for serving TLS connections.
	// Must be provided to serve TLS connections.
	KeyFile string

	// ServerName is used with the TLS certificate to ensure the name we
	// provide matches the certificate
	ServerName string

	// RejoinAfterLeave controls our interaction with Serf.
	// When set to false (default), a leave causes a Consul to not rejoin
	// the cluster until an explicit join is received. If this is set to
	// true, we ignore the leave, and rejoin the cluster on start.
	RejoinAfterLeave bool

	// Build is a string that is gossiped around, and can be used to help
	// operators track which versions are actively deployed
	Build string

	// ACLToken is the default token to use when making a request.
	// If not provided, the anonymous token is used. This enables
	// backwards compatibility as well.
	ACLToken string

	// ACLMasterToken is used to bootstrap the ACL system. It should be specified
	// on the servers in the ACLDatacenter. When the leader comes online, it ensures
	// that the Master token is available. This provides the initial token.
	ACLMasterToken string

	// ACLDatacenter provides the authoritative datacenter for ACL
	// tokens. If not provided, ACL verification is disabled.
	ACLDatacenter string

	// ACLTTL controls the time-to-live of cached ACL policies.
	// It can be set to zero to disable caching, but this adds
	// a substantial cost.
	ACLTTL time.Duration

	// ACLDefaultPolicy is used to control the ACL interaction when
	// there is no defined policy. This can be "allow" which means
	// ACLs are used to black-list, or "deny" which means ACLs are
	// white-lists.
	ACLDefaultPolicy string

	// ACLDownPolicy controls the behavior of ACLs if the ACLDatacenter
	// cannot be contacted. It can be either "deny" to deny all requests,
	// or "extend-cache" which ignores the ACLCacheInterval and uses
	// cached policies. If a policy is not in the cache, it acts like deny.
	// "allow" can be used to allow all requests. This is not recommended.
	ACLDownPolicy string

	// TombstoneTTL is used to control how long KV tombstones are retained.
	// This provides a window of time where the X-Consul-Index is monotonic.
	// Outside this window, the index may not be monotonic. This is a result
	// of a few trade offs:
	// 1) The index is defined by the data view and not globally. This is a
	// performance optimization that prevents any write from incrementing the
	// index for all data views.
	// 2) Tombstones are not kept indefinitely, since otherwise storage required
	// is also monotonic. This prevents deletes from reducing the disk space
	// used.
	// In theory, neither of these are intrinsic limitations, however for the
	// purposes of building a practical system, they are reasonable trade offs.
	//
	// It is also possible to set this to an incredibly long time, thereby
	// simulating infinite retention. This is not recommended however.
	//
	TombstoneTTL time.Duration

	// TombstoneTTLGranularity is used to control how granular the timers are
	// for the Tombstone GC. This is used to batch the GC of many keys together
	// to reduce overhead. It is unlikely a user would ever need to tune this.
	TombstoneTTLGranularity time.Duration

	// Minimum Session TTL
	SessionTTLMin time.Duration

	// ServerUp callback can be used to trigger a notification that
	// a Consul server is now up and known about.
	ServerUp func()

	// UserEventHandler callback can be used to handle incoming
	// user events. This function should not block.
	UserEventHandler func(serf.UserEvent)

	// DisableCoordinates controls features related to network coordinates.
	DisableCoordinates bool

	// CoordinateUpdatePeriod controls how long a server batches coordinate
	// updates before applying them in a Raft transaction. A larger period
	// leads to fewer Raft transactions, but also the stored coordinates
	// being more stale.
	CoordinateUpdatePeriod time.Duration

	// CoordinateUpdateBatchSize controls the maximum number of updates a
	// server batches before applying them in a Raft transaction.
	CoordinateUpdateBatchSize int

	// CoordinateUpdateMaxBatches controls the maximum number of batches we
	// are willing to apply in one period. After this limit we will issue a
	// warning and discard the remaining updates.
	CoordinateUpdateMaxBatches int
}

Config is used to configure the server

func DefaultConfig

func DefaultConfig() *Config

DefaultConfig is used to return a sane default configuration

func (*Config) CheckACL added in v0.4.0

func (c *Config) CheckACL() error

CheckACL is used to sanity check the ACL configuration

func (*Config) CheckVersion

func (c *Config) CheckVersion() error

CheckVersion is used to check if the ProtocolVersion is valid

type Conn

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

Conn is a pooled connection to a Consul server

func (*Conn) Close

func (c *Conn) Close() error

type ConnPool

type ConnPool struct {
	sync.Mutex
	// contains filtered or unexported fields
}

ConnPool is used to maintain a connection pool to other Consul servers. This is used to reduce the latency of RPC requests between servers. It is only used to pool connections in the rpcConsul mode. Raft connections are pooled separately.

func NewPool

func NewPool(logOutput io.Writer, maxTime time.Duration, maxStreams int, tlsWrap tlsutil.DCWrapper) *ConnPool

NewPool is used to make a new connection pool Maintain at most one connection per host, for up to maxTime. Set maxTime to 0 to disable reaping. maxStreams is used to control the number of idle streams allowed. If TLS settings are provided outgoing connections use TLS.

func (*ConnPool) RPC

func (p *ConnPool) RPC(dc string, addr net.Addr, version int, method string, args interface{}, reply interface{}) error

RPC is used to make an RPC call to a remote host

func (*ConnPool) Shutdown

func (p *ConnPool) Shutdown() error

Shutdown is used to close the connection pool

type Coordinate added in v0.6.0

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

Coordinate manages queries and updates for network coordinates.

func NewCoordinate added in v0.6.0

func NewCoordinate(srv *Server) *Coordinate

NewCoordinate returns a new Coordinate endpoint.

func (*Coordinate) ListDatacenters added in v0.6.0

func (c *Coordinate) ListDatacenters(args *struct{}, reply *[]structs.DatacenterMap) error

ListDatacenters returns the list of datacenters and their respective nodes and the raw coordinates of those nodes (if no coordinates are available for any of the nodes, the node list may be empty).

func (*Coordinate) ListNodes added in v0.6.0

ListNodes returns the list of nodes with their raw network coordinates (if no coordinates are available for a node it won't appear in this list).

func (*Coordinate) Update added in v0.6.0

func (c *Coordinate) Update(args *structs.CoordinateUpdateRequest, reply *struct{}) (err error)

Update inserts or updates the LAN coordinate of a node.

type Filter added in v0.4.0

type Filter interface {
	Len() int
	Filter(int) bool
	Move(dst, src, span int)
}

Filter interface is used with FilterEntries to do an in-place filter of a slice.

type Health

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

Health endpoint is used to query the health information

func (*Health) ChecksInState

func (h *Health) ChecksInState(args *structs.ChecksInStateRequest,
	reply *structs.IndexedHealthChecks) error

ChecksInState is used to get all the checks in a given state

func (*Health) NodeChecks

func (h *Health) NodeChecks(args *structs.NodeSpecificRequest,
	reply *structs.IndexedHealthChecks) error

NodeChecks is used to get all the checks for a node

func (*Health) ServiceChecks

func (h *Health) ServiceChecks(args *structs.ServiceSpecificRequest,
	reply *structs.IndexedHealthChecks) error

ServiceChecks is used to get all the checks for a service

func (*Health) ServiceNodes

ServiceNodes returns all the nodes registered as part of a service including health info

type Interface

type Interface interface {
	RPC(method string, args interface{}, reply interface{}) error
	LANMembers() []serf.Member
	LocalMember() serf.Member
}

Interface is used to provide either a Client or Server, both of which can be used to perform certain common Consul methods

type Internal added in v0.2.0

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

Internal endpoint is used to query the miscellaneous info that does not necessarily fit into the other systems. It is also used to hold undocumented APIs that users should not rely on.

func (*Internal) EventFire added in v0.4.0

func (m *Internal) EventFire(args *structs.EventFireRequest,
	reply *structs.EventFireResponse) error

EventFire is a bit of an odd endpoint, but it allows for a cross-DC RPC call to fire an event. The primary use case is to enable user events being triggered in a remote DC.

func (*Internal) KeyringOperation added in v0.5.0

func (m *Internal) KeyringOperation(
	args *structs.KeyringRequest,
	reply *structs.KeyringResponses) error

KeyringOperation will query the WAN and LAN gossip keyrings of all nodes.

func (*Internal) NodeDump added in v0.2.0

func (m *Internal) NodeDump(args *structs.DCSpecificRequest,
	reply *structs.IndexedNodeDump) error

NodeDump is used to generate information about all of the nodes.

func (*Internal) NodeInfo added in v0.2.0

func (m *Internal) NodeInfo(args *structs.NodeSpecificRequest,
	reply *structs.IndexedNodeDump) error

NodeInfo is used to retrieve information about a specific node.

type KVS

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

KVS endpoint is used to manipulate the Key-Value store

func (*KVS) Apply

func (k *KVS) Apply(args *structs.KVSRequest, reply *bool) error

Apply is used to apply a KVS request to the data store. This should only be used for operations that modify the data

func (*KVS) Get

func (k *KVS) Get(args *structs.KeyRequest, reply *structs.IndexedDirEntries) error

Get is used to lookup a single key

func (*KVS) List

func (k *KVS) List(args *structs.KeyRequest, reply *structs.IndexedDirEntries) error

List is used to list all keys with a given prefix

func (*KVS) ListKeys added in v0.2.0

func (k *KVS) ListKeys(args *structs.KeyListRequest, reply *structs.IndexedKeyList) error

ListKeys is used to list all keys with a given prefix to a separator

type RPCType

type RPCType byte

type RaftLayer

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

RaftLayer implements the raft.StreamLayer interface, so that we can use a single RPC layer for Raft and Consul

func NewRaftLayer

func NewRaftLayer(addr net.Addr, tlsWrap tlsutil.Wrapper) *RaftLayer

NewRaftLayer is used to initialize a new RaftLayer which can be used as a StreamLayer for Raft. If a tlsConfig is provided, then the connection will use TLS.

func (*RaftLayer) Accept

func (l *RaftLayer) Accept() (net.Conn, error)

Accept is used to return connection which are dialed to be used with the Raft layer

func (*RaftLayer) Addr

func (l *RaftLayer) Addr() net.Addr

Addr is used to return the address of the listener

func (*RaftLayer) Close

func (l *RaftLayer) Close() error

Close is used to stop listening for Raft connections

func (*RaftLayer) Dial

func (l *RaftLayer) Dial(address string, timeout time.Duration) (net.Conn, error)

Dial is used to create a new outgoing connection

func (*RaftLayer) Handoff

func (l *RaftLayer) Handoff(c net.Conn) error

Handoff is used to hand off a connection to the RaftLayer. This allows it to be Accept()'ed

type Server

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

Server is Consul server which manages the service discovery, health checking, DC forwarding, Raft, and multiple Serf pools.

func NewServer

func NewServer(config *Config) (*Server, error)

NewServer is used to construct a new Consul server from the configuration, potentially returning an error

func (*Server) Encrypted added in v0.5.0

func (s *Server) Encrypted() bool

Encrypted determines if gossip is encrypted

func (*Server) GetLANCoordinate added in v0.6.0

func (s *Server) GetLANCoordinate() (*coordinate.Coordinate, error)

GetLANCoordinate returns the coordinate of the server in the LAN gossip pool.

func (*Server) GetWANCoordinate added in v0.6.0

func (s *Server) GetWANCoordinate() (*coordinate.Coordinate, error)

GetWANCoordinate returns the coordinate of the server in the WAN gossip pool.

func (*Server) IsLeader

func (s *Server) IsLeader() bool

IsLeader checks if this server is the cluster leader

func (*Server) JoinLAN

func (s *Server) JoinLAN(addrs []string) (int, error)

JoinLAN is used to have Consul join the inner-DC pool The target address should be another node inside the DC listening on the Serf LAN address

func (*Server) JoinWAN

func (s *Server) JoinWAN(addrs []string) (int, error)

JoinWAN is used to have Consul join the cross-WAN Consul ring The target address should be another node listening on the Serf WAN address

func (*Server) KeyManagerLAN added in v0.5.0

func (s *Server) KeyManagerLAN() *serf.KeyManager

KeyManagerLAN returns the LAN Serf keyring manager

func (*Server) KeyManagerWAN added in v0.5.0

func (s *Server) KeyManagerWAN() *serf.KeyManager

KeyManagerWAN returns the WAN Serf keyring manager

func (*Server) LANMembers

func (s *Server) LANMembers() []serf.Member

LANMembers is used to return the members of the LAN cluster

func (*Server) Leave

func (s *Server) Leave() error

Leave is used to prepare for a graceful shutdown of the server

func (*Server) LocalMember added in v0.3.0

func (c *Server) LocalMember() serf.Member

LocalMember is used to return the local node

func (*Server) RPC

func (s *Server) RPC(method string, args interface{}, reply interface{}) error

RPC is used to make a local RPC call

func (*Server) RemoveFailedNode

func (s *Server) RemoveFailedNode(node string) error

RemoveFailedNode is used to remove a failed node from the cluster

func (*Server) Shutdown

func (s *Server) Shutdown() error

Shutdown is used to shutdown the server

func (*Server) Stats

func (s *Server) Stats() map[string]map[string]string

Stats is used to return statistics for debugging and insight for various sub-systems

func (*Server) WANMembers

func (s *Server) WANMembers() []serf.Member

WANMembers is used to return the members of the LAN cluster

type Session added in v0.3.0

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

Session endpoint is used to manipulate sessions for KV

func (*Session) Apply added in v0.3.0

func (s *Session) Apply(args *structs.SessionRequest, reply *string) error

Apply is used to apply a modifying request to the data store. This should only be used for operations that modify the data

func (*Session) Get added in v0.3.0

Get is used to retrieve a single session

func (*Session) List added in v0.3.0

List is used to list all the active sessions

func (*Session) NodeSessions added in v0.3.0

func (s *Session) NodeSessions(args *structs.NodeSpecificRequest,
	reply *structs.IndexedSessions) error

NodeSessions is used to get all the sessions for a particular node

func (*Session) Renew added in v0.5.0

Renew is used to renew the TTL on a single session

type Status

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

Status endpoint is used to check on server status

func (*Status) Leader

func (s *Status) Leader(args struct{}, reply *string) error

Leader is used to get the address of the leader

func (*Status) Peers

func (s *Status) Peers(args struct{}, reply *[]string) error

Peers is used to get all the Raft peers

func (*Status) Ping

func (s *Status) Ping(args struct{}, reply *struct{}) error

Ping is used to just check for connectivity

type StreamClient added in v0.3.0

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

streamClient is used to wrap a stream with an RPC client

func (*StreamClient) Close added in v0.5.1

func (sc *StreamClient) Close()

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