micro/server/options.go

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package server
import (
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"context"
"crypto/tls"
"net"
"sync"
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"time"
"go.unistack.org/micro/v4/codec"
"go.unistack.org/micro/v4/logger"
"go.unistack.org/micro/v4/metadata"
"go.unistack.org/micro/v4/meter"
"go.unistack.org/micro/v4/network/transport"
"go.unistack.org/micro/v4/options"
"go.unistack.org/micro/v4/register"
"go.unistack.org/micro/v4/tracer"
"go.unistack.org/micro/v4/util/id"
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)
var (
// ServerRequestDurationSeconds specifies meter metric name
ServerRequestDurationSeconds = "server_request_duration_seconds"
// ServerRequestLatencyMicroseconds specifies meter metric name
ServerRequestLatencyMicroseconds = "server_request_latency_microseconds"
// ServerRequestTotal specifies meter metric name
ServerRequestTotal = "server_request_total"
// ServerRequestInflight specifies meter metric name
ServerRequestInflight = "server_request_inflight"
)
// Option func
type Option func(*Options)
// Options server struct
type Options struct {
// Context holds the external options and can be used for server shutdown
Context context.Context
// Register holds the register
Register register.Register
// Tracer holds the tracer
Tracer tracer.Tracer
// Logger holds the logger
Logger logger.Logger
// Meter holds the meter
Meter meter.Meter
// Transport holds the transport
Transport transport.Transport
// Listener may be passed if already created
Listener net.Listener
// Wait group
Wait *sync.WaitGroup
// TLSConfig specifies tls.Config for secure serving
TLSConfig *tls.Config
// Metadata holds the server metadata
Metadata metadata.Metadata
// RegisterCheck run before register server
RegisterCheck func(context.Context) error
// Codecs map to handle content-type
Codecs map[string]codec.Codec
// ID holds the id of the server
ID string
// Namespace for te server
Namespace string
// Name holds the server name
Name string
// Address holds the server address
Address string
// Advertise holds the advertise address
Advertise string
// Version holds the server version
Version string
// HdlrWrappers holds the handler wrappers
HdlrWrappers []HandlerWrapper
// RegisterAttempts holds the number of register attempts before error
RegisterAttempts int
// RegisterInterval holds he interval for re-register
RegisterInterval time.Duration
// RegisterTTL specifies TTL for register record
RegisterTTL time.Duration
// MaxConn limits number of connections
MaxConn int
// DeregisterAttempts holds the number of deregister attempts before error
DeregisterAttempts int
// Hooks may contains HandlerWrapper or Server func wrapper
Hooks options.Hooks
}
// NewOptions returns new options struct with default or passed values
func NewOptions(opts ...Option) Options {
options := Options{
Codecs: make(map[string]codec.Codec),
Context: context.Background(),
Metadata: metadata.New(0),
RegisterInterval: DefaultRegisterInterval,
RegisterTTL: DefaultRegisterTTL,
RegisterCheck: DefaultRegisterCheck,
Logger: logger.DefaultLogger,
Meter: meter.DefaultMeter,
Tracer: tracer.DefaultTracer,
Register: register.DefaultRegister,
Transport: transport.DefaultTransport,
Address: DefaultAddress,
Name: DefaultName,
Version: DefaultVersion,
ID: id.Must(),
Namespace: DefaultNamespace,
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}
for _, o := range opts {
o(&options)
}
return options
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}
// Name sets the server name option
func Name(n string) Option {
return func(o *Options) {
o.Name = n
}
}
// Namespace to register handlers in
func Namespace(n string) Option {
return func(o *Options) {
o.Namespace = n
}
}
// Logger sets the logger option
func Logger(l logger.Logger) Option {
return func(o *Options) {
o.Logger = l
}
}
// Meter sets the meter option
func Meter(m meter.Meter) Option {
return func(o *Options) {
o.Meter = m
}
}
// ID unique server id
func ID(id string) Option {
return func(o *Options) {
o.ID = id
}
}
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// Version of the service
func Version(v string) Option {
return func(o *Options) {
o.Version = v
}
}
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// Address to bind to - host:port
func Address(a string) Option {
return func(o *Options) {
o.Address = a
}
}
// Advertise the address to advertise for discovery - host:port
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func Advertise(a string) Option {
return func(o *Options) {
o.Advertise = a
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}
}
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// Codec to use to encode/decode requests for a given content type
func Codec(contentType string, c codec.Codec) Option {
return func(o *Options) {
o.Codecs[contentType] = c
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}
}
// Context specifies a context for the service.
// Can be used to signal shutdown of the service
// Can be used for extra option values.
func Context(ctx context.Context) Option {
return func(o *Options) {
o.Context = ctx
}
}
// Register used for discovery
func Register(r register.Register) Option {
return func(o *Options) {
o.Register = r
}
}
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// Tracer mechanism for distributed tracking
func Tracer(t tracer.Tracer) Option {
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return func(o *Options) {
o.Tracer = t
}
}
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// Transport mechanism for communication e.g http, rabbitmq, etc
func Transport(t transport.Transport) Option {
return func(o *Options) {
o.Transport = t
}
}
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// Metadata associated with the server
func Metadata(md metadata.Metadata) Option {
return func(o *Options) {
o.Metadata = metadata.Copy(md)
}
}
// RegisterCheck run func before register service
func RegisterCheck(fn func(context.Context) error) Option {
return func(o *Options) {
o.RegisterCheck = fn
}
}
// RegisterTTL registers service with a TTL
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func RegisterTTL(t time.Duration) Option {
return func(o *Options) {
o.RegisterTTL = t
}
}
// RegisterInterval registers service with at interval
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func RegisterInterval(t time.Duration) Option {
return func(o *Options) {
o.RegisterInterval = t
}
}
// TLSConfig specifies a *tls.Config
func TLSConfig(t *tls.Config) Option {
return func(o *Options) {
// set the internal tls
o.TLSConfig = t
// set the default transport if one is not
// already set. Required for Init call below.
// set the transport tls
_ = o.Transport.Init(
transport.TLSConfig(t),
)
}
}
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// Wait tells the server to wait for requests to finish before exiting
// If `wg` is nil, server only wait for completion of rpc handler.
// For user need finer grained control, pass a concrete `wg` here, server will
// wait against it on stop.
func Wait(wg *sync.WaitGroup) Option {
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return func(o *Options) {
if wg == nil {
wg = new(sync.WaitGroup)
}
o.Wait = wg
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}
}
// WrapHandler adds a handler Wrapper to a list of options passed into the server
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func WrapHandler(w HandlerWrapper) Option {
return func(o *Options) {
o.HdlrWrappers = append(o.HdlrWrappers, w)
}
}
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// MaxConn specifies maximum number of max simultaneous connections to server
func MaxConn(n int) Option {
return func(o *Options) {
o.MaxConn = n
}
}
// Listener specifies the net.Listener to use instead of the default
func Listener(l net.Listener) Option {
return func(o *Options) {
o.Listener = l
}
}
// HandlerOption func
type HandlerOption func(*HandlerOptions)
// HandlerOptions struct
type HandlerOptions struct {
// Context holds external options
Context context.Context
// Metadata for handler
Metadata map[string]metadata.Metadata
}
// NewHandlerOptions creates new HandlerOptions
func NewHandlerOptions(opts ...HandlerOption) HandlerOptions {
options := HandlerOptions{
Context: context.Background(),
Metadata: make(map[string]metadata.Metadata),
}
for _, o := range opts {
o(&options)
}
return options
}
// EndpointMetadata is a Handler option that allows metadata to be added to
// individual endpoints.
func EndpointMetadata(name string, md metadata.Metadata) HandlerOption {
return func(o *HandlerOptions) {
o.Metadata[name] = metadata.Copy(md)
}
}