client

package
v1.2.6 Latest Latest
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 Go to latest Published: Jun 6, 2022 License: Apache-2.0 Imports: 38 Imported by: 0

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Constants

This section is empty.

Variables

This section is empty.

Functions

func ClearEndpointCache added in v1.0.8 

func ClearEndpointCache()

Types

type Cache 

type Cache struct {
	ServiceEndpoints map[string][]*serviceEndpoint

	DisableLogging bool
	// contains filtered or unexported fields
}

func (*Cache) AddServiceEndpoints 

func (c *Cache) AddServiceEndpoints(serviceName string, eps []*serviceEndpoint)

AddServiceEndpoints will append slice of service endpoints associated with the given serviceName within map

serviceName = lowercase of servicename.namespacename

func (*Cache) GetLiveServiceEndpoints 

func (c *Cache) GetLiveServiceEndpoints(serviceName string, version string, ignoreExpired ...bool) (liveEndpoints []*serviceEndpoint)

GetLiveServiceEndpoints will retrieve currently non-expired service endpoints and remove any expired service endpoints from map, for a given serviceName

serviceName = lowercase of servicename.namespacename

func (*Cache) PurgeServiceEndpointByHostAndPort added in v1.0.8 

func (c *Cache) PurgeServiceEndpointByHostAndPort(serviceName string, host string, port uint)

PurgeServiceEndpointByHostAndPort will remove a specific endpoint for a service based on host and port info

serviceName = lowercase of servicename.namespacename

func (*Cache) PurgeServiceEndpoints 

func (c *Cache) PurgeServiceEndpoints(serviceName string)

PurgeServiceEndpoints will remove all endpoints associated with the given serviceName within map

serviceName = lowercase of servicename.namespacename

type Client 

type Client struct {
	// client properties
	AppName          string
	ConfigFileName   string
	CustomConfigPath string

	// web server config - for optional gin web server to be launched upon grpc client dial
	WebServerConfig *WebServerConfig

	// indicate if after dial, client will wait for target service health probe success before continuing to allow rpc
	WaitForServerReady bool

	// one or more unary client interceptors for handling wrapping actions
	UnaryClientInterceptors []grpc.UnaryClientInterceptor

	// one or more stream client interceptors for handling wrapping actions
	StreamClientInterceptors []grpc.StreamClientInterceptor

	// typically wrapper action to handle monitoring
	StatsHandler stats.Handler

	// handler to invoke before gRPC client dial is to start
	BeforeClientDial func(cli *Client)

	// handler to invoke after gRPC client dial performed
	AfterClientDial func(cli *Client)

	// handler to invoke before gRPC client connection is to close
	BeforeClientClose func(cli *Client)

	// handler to invoke after gRPC client connection has closed
	AfterClientClose func(cli *Client)
	// contains filtered or unexported fields
}

Client represents a gRPC client's connection and entry point, also provides optional gin based web server upon dial

note:

  1. Using Compressor with RPC a) import "google.golang.org/grpc/encoding/gzip" b) in RPC Call, pass grpc.UseCompressor(gzip.Name)) in the third parameter example: RPCCall(ctx, &pb.Request{...}, grpc.UseCompressor(gzip.Name))

  2. Notifier Client yaml a) xyz-notifier-client.yaml where xyz is the target gRPC service endpoint name

func NewClient 

func NewClient(appName string, configFileName string, customConfigPath string) *Client

NewClient creates grpc client

func (*Client) ClientConnection 

func (c *Client) ClientConnection() grpc.ClientConnInterface

ClientConnection returns the currently loaded grpc client connection

func (*Client) Close 

func (c *Client) Close()

Close will close grpc client connection

func (*Client) ConfiguredDialMinConnectTimeoutSeconds added in v1.0.7 

func (c *Client) ConfiguredDialMinConnectTimeoutSeconds() uint

ConfiguredDialMinConnectTimeoutSeconds gets the timeout seconds from config yaml

func (*Client) ConfiguredForClientDial added in v1.0.7 

func (c *Client) ConfiguredForClientDial() bool

ConfiguredForClientDial checks if the config yaml is ready for client dial operation

func (*Client) ConfiguredForSNSDiscoveryTopicArn added in v1.0.7 

func (c *Client) ConfiguredForSNSDiscoveryTopicArn() bool

ConfiguredForSNSDiscoveryTopicArn indicates if the sns topic arn for service discovery is configured within the config yaml

func (*Client) ConfiguredSNSDiscoveryTopicArn added in v1.0.7 

func (c *Client) ConfiguredSNSDiscoveryTopicArn() string

ConfiguredSNSDiscoveryTopicArn returns the sns discovery topic arn as configured in config yaml

func (*Client) Dial 

func (c *Client) Dial(ctx context.Context) error

Dial will dial grpc service and establish client connection

func (*Client) DoNotifierAlertService added in v1.0.8 

func (c *Client) DoNotifierAlertService() (err error)

DoNotifierAlertService should be called from goroutine after the client dial completes, this service is to subscribe and receive callbacks from notifier server of service host online offline statuses

Example: 

go func() {
			  svc1Cli.DoNotifierAlertService()
		  }()

func (*Client) GetState 

func (c *Client) GetState() connectivity.State

GetState returns the current grpc client connection's state

func (*Client) HealthProbe 

func (c *Client) HealthProbe(serviceName string, timeoutDuration ...time.Duration) (grpc_health_v1.HealthCheckResponse_ServingStatus, error)

HealthProbe manually checks service serving health status

func (*Client) PreloadConfigData added in v1.0.7 

func (c *Client) PreloadConfigData() error

PreloadConfigData will load the config data before Dial()

func (*Client) Ready added in v1.0.8 

func (c *Client) Ready() bool

Ready indicates client connection is ready to invoke grpc methods

func (*Client) RemoteAddress 

func (c *Client) RemoteAddress() string

RemoteAddress gets the remote endpoint address currently connected to

func (*Client) UpdateLoadBalanceResolver added in v1.0.8 

func (c *Client) UpdateLoadBalanceResolver() error

UpdateLoadBalanceResolves updates client load balancer resolver state with new endpoint addresses

func (*Client) ZLog added in v1.0.8 

func (c *Client) ZLog() *data.ZapLog

ZLog access internal zap logger

type HostDiscoveryNotification added in v1.0.8 

type HostDiscoveryNotification struct {
	MsgType string `json:"msg_type"`
	Action  string `json:"action"`
	Host    string `json:"host"`
}

HostDiscoveryNotification struct contains the field values for notification discovery payload

`{"msg_type":"host-discovery", "action":"online | offline", "host":"123.123.123.123:9999"}`

func (*HostDiscoveryNotification) Marshal added in v1.0.8 

func (d *HostDiscoveryNotification) Marshal() (string, error)

func (*HostDiscoveryNotification) Unmarshal added in v1.0.8 

func (d *HostDiscoveryNotification) Unmarshal(jsonData string) error

type NotifierClient added in v1.0.8 

type NotifierClient struct {
	AppName          string
	ConfigFileName   string
	CustomConfigPath string

	BeforeClientDialHandler  func(*Client)
	AfterClientDialHandler   func(*Client)
	BeforeClientCloseHandler func(*Client)
	AfterClientCloseHandler  func(*Client)

	UnaryClientInterceptorHandlers  []grpc.UnaryClientInterceptor
	StreamClientInterceptorHandlers []grpc.StreamClientInterceptor

	ServiceAlertStartedHandler func()
	ServiceAlertSkippedHandler func(reason string)
	ServiceAlertStoppedHandler func(reason string)
	ServiceHostOnlineHandler   func(host string, port uint)
	ServiceHostOfflineHandler  func(host string, port uint)
	// contains filtered or unexported fields
}

func NewNotifierClient added in v1.0.8 

func NewNotifierClient(appName string, configFileName string, customConfigPath string, enableLogging ...bool) *NotifierClient

NewNotifierClient creates a new prepared notifier client for use in service discovery notification

func (*NotifierClient) Close added in v1.0.8 

func (n *NotifierClient) Close()

Close will disconnect the notifier client from the notifier server

func (*NotifierClient) ConfiguredForNotifierClientDial added in v1.0.8 

func (n *NotifierClient) ConfiguredForNotifierClientDial() bool

ConfiguredForNotifierClientDial checks if the notifier client is configured for options, where Dial can be attempted to invoke

func (*NotifierClient) ConfiguredSNSDiscoveryTopicArn added in v1.0.8 

func (n *NotifierClient) ConfiguredSNSDiscoveryTopicArn() string

ConfiguredSNSDiscoveryTopicArn gets the topicArn defined for the notifier client service discovery endpoints

func (*NotifierClient) Dial added in v1.0.8 

func (n *NotifierClient) Dial() error

Dial will connect the notifier client to the notifier server

func (*NotifierClient) NotifierClientAlertServicesStarted added in v1.0.8 

func (n *NotifierClient) NotifierClientAlertServicesStarted() bool

NotifierClientAlertServicesStarted indicates notifier client services started via Subscribe() action

func (*NotifierClient) PurgeEndpointCache added in v1.0.8 

func (n *NotifierClient) PurgeEndpointCache()

PurgeEndpointCache removes current client connection's service name ip port from cache, if current service name ip port not found, entire cache will be purged

func (*NotifierClient) Subscribe added in v1.0.8 

func (n *NotifierClient) Subscribe(topicArn string) (err error)

Subscribe will subscribe this notifier client to a specified topicArn with sns, via notifier server; this subscription will also start the recurring loop to wait for notifier server stream data, for receiving service discovery host info; when service discovery host info is received, the appropriate ServiceHostOnlineHandler or ServiceHostOfflineHandler is triggered; calling the Close() or Unsubscribe() or receiving error conditions from notifier server will sever the long running service discovery process.

func (*NotifierClient) Unsubscribe added in v1.0.8 

func (n *NotifierClient) Unsubscribe() (err error)

Unsubscribe will stop notification alert services and disconnect from subscription on notifier server

type WebServerConfig added in v1.0.7 

type WebServerConfig struct {
	AppName          string
	ConfigFileName   string
	CustomConfigPath string

	// define web server router info
	WebServerRoutes map[string]*ginw.RouteDefinition

	// getter only
	WebServerLocalAddress string

	// clean up func
	CleanUp func()
}

WebServerConfig info, note: WebServerLocalAddress = read only getter 

note: WebServerRoutes = map[string]*ginw.RouteDefinition{
		"base": {
			Routes: []*ginw.Route{
				{
					Method: ginhttpmethod.GET,
					RelativePath: "/",
					Handler: func(c *gin.Context, bindingInputPtr interface{}) {
						c.String(200, "Connector Client Http Host Up")
					},
				},
			},
		},
	}

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