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options.go
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options.go
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// MIT License
//
// Copyright (c) 2020 Lack
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package server
import (
"context"
"crypto/tls"
"sync"
"time"
"github.com/lack-io/vine/core/broker"
"github.com/lack-io/vine/core/codec"
"github.com/lack-io/vine/core/registry"
"github.com/lack-io/vine/core/transport"
)
type Options struct {
Codecs map[string]codec.NewCodec
Broker broker.Broker
Registry registry.Registry
Transport transport.Transport
Metadata map[string]string
Name string
Address string
Advertise string
Id string
Version string
HdlrWrappers []HandlerWrapper
SubWrappers []SubscriberWrapper
// RegisterCheck runs a check function before registering the service
RegisterCheck func(context.Context) error
// The register expiry time
RegisterTTL time.Duration
// The interval on which to register
RegisterInterval time.Duration
// The router for requests
Router Router
// TLSConfig specifies tls.Config for secure serving
TLSConfig *tls.Config
// Other options for implementations of the interface
// can be stored in a context
Context context.Context
}
func NewOptions(opt ...Option) Options {
opts := Options{
Codecs: make(map[string]codec.NewCodec),
Metadata: map[string]string{},
RegisterInterval: DefaultRegisterInterval,
RegisterTTL: DefaultRegisterTTL,
}
for _, o := range opt {
o(&opts)
}
if opts.Broker == nil {
opts.Broker = broker.DefaultBroker
}
if opts.Registry == nil {
opts.Registry = registry.DefaultRegistry
}
if opts.Transport == nil {
opts.Transport = transport.DefaultTransport
}
if opts.RegisterCheck == nil {
opts.RegisterCheck = DefaultRegisterCheck
}
if len(opts.Address) == 0 {
opts.Address = DefaultAddress
}
if len(opts.Name) == 0 {
opts.Name = DefaultName
}
if len(opts.Id) == 0 {
opts.Id = DefaultId
}
if len(opts.Version) == 0 {
opts.Version = DefaultVersion
}
return opts
}
// Name the name of server
func Name(n string) Option {
return func(o *Options) {
o.Name = n
}
}
// Id Unique server id
func Id(id string) Option {
return func(o *Options) {
o.Id = id
}
}
// Version of the service
func Version(v string) Option {
return func(o *Options) {
o.Version = v
}
}
// 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
func Advertise(a string) Option {
return func(o *Options) {
o.Advertise = a
}
}
// Broker to use for pub/sub
func Broker(b broker.Broker) Option {
return func(o *Options) {
o.Broker = b
}
}
// Codec to use to encode/decode requests for a given content type
func Codec(contentType string, c codec.NewCodec) Option {
return func(o *Options) {
o.Codecs[contentType] = c
}
}
// 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
}
}
// Registry used for discovery
func Registry(r registry.Registry) Option {
return func(o *Options) {
o.Registry = r
}
}
// Transport mechanism for communication e.g http, rabbitmq, etc
func Transport(t transport.Transport) Option {
return func(o *Options) {
o.Transport = t
}
}
// Metadata associated with the server
func Metadata(md map[string]string) Option {
return func(o *Options) {
o.Metadata = md
}
}
// RegisterCheck run func before registry service
func RegisterCheck(fn func(context.Context) error) Option {
return func(o *Options) {
o.RegisterCheck = fn
}
}
// RegisterTTL register the service with a TTL
func RegisterTTL(t time.Duration) Option {
return func(o *Options) {
o.RegisterTTL = t
}
}
// RegisterInterval register the service with at interval
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.
if o.Transport == nil {
o.Transport = transport.DefaultTransport
}
// set the transport tls
o.Transport.Init(
transport.Secure(true),
transport.TLSConfig(t),
)
}
}
// WithRouter sets the request router
func WithRouter(r Router) Option {
return func(o *Options) {
o.Router = r
}
}
// 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 {
return func(o *Options) {
if o.Context == nil {
o.Context = context.Background()
}
if wg == nil {
wg = new(sync.WaitGroup)
}
o.Context = context.WithValue(o.Context, "wait", wg)
}
}
// WrapHandler adds a handler Wrapper to a list of options passed into the server
func WrapHandler(w HandlerWrapper) Option {
return func(o *Options) {
o.HdlrWrappers = append(o.HdlrWrappers, w)
}
}
// WrapSubscriber adds a subscriber Wrapper to a list of options passed into the server
func WrapSubscriber(w SubscriberWrapper) Option {
return func(o *Options) {
o.SubWrappers = append(o.SubWrappers, w)
}
}