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proxy.go
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proxy.go
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/*
* Copyright 2023 Wang Min Xiang
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package proxies
import (
"github.com/aacfactory/errors"
"github.com/aacfactory/fns/clusters"
"github.com/aacfactory/fns/context"
"github.com/aacfactory/fns/runtime"
"github.com/aacfactory/fns/transports"
"github.com/aacfactory/fns/transports/fast"
"github.com/aacfactory/logs"
)
type ProxyOptions struct {
Log logs.Logger
Config Config
Runtime *runtime.Runtime
Manager clusters.ClusterEndpointsManager
Dialer transports.Dialer
}
type Proxy interface {
Construct(options ProxyOptions) (err error)
Port() int
Run(ctx context.Context) (err error)
Shutdown(ctx context.Context)
}
func New(options ...Option) (p Proxy, err error) {
opt := Options{
transport: fast.New(),
middlewares: make([]transports.Middleware, 0, 1),
handlers: make([]transports.MuxHandler, 0, 1),
}
for _, option := range options {
optErr := option(&opt)
if optErr != nil {
err = errors.Warning("fns: new proxy failed").WithCause(optErr)
return
}
}
p = &proxy{
log: nil,
transport: opt.transport,
middlewares: opt.middlewares,
handlers: opt.handlers,
}
return
}
type proxy struct {
log logs.Logger
transport transports.Transport
middlewares []transports.Middleware
handlers []transports.MuxHandler
}
func (p *proxy) Construct(options ProxyOptions) (err error) {
p.log = options.Log
// config
config := options.Config
// middlewares
middlewares := make([]transports.Middleware, 0, 1)
middlewares = append(middlewares, runtime.Middleware(options.Runtime))
var corsMiddleware transports.Middleware
for _, middleware := range p.middlewares {
if middleware.Name() == "cors" {
corsMiddleware = middleware
continue
}
middlewares = append(middlewares, middleware)
}
if corsMiddleware != nil {
middlewares = append([]transports.Middleware{corsMiddleware}, middlewares...)
}
// handlers
mux := transports.NewMux()
for _, handler := range p.handlers {
handlerConfig, handlerConfigErr := config.HandlerConfig(handler.Name())
if handlerConfigErr != nil {
err = errors.Warning("fns: construct proxy failed, new transport handler failed").WithCause(handlerConfigErr).WithMeta("handler", handler.Name())
return
}
handlerErr := handler.Construct(transports.MuxHandlerOptions{
Log: p.log.With("handler", handler.Name()),
Config: handlerConfig,
})
if handlerErr != nil {
err = errors.Warning("fns: construct proxy failed, new transport handler failed").WithCause(handlerErr).WithMeta("handler", handler.Name())
return
}
mux.Add(handler)
}
mux.Add(NewProxyHandler(options.Manager, options.Dialer))
// transport
transportErr := p.transport.Construct(transports.Options{
Log: p.log.With("transport", p.transport.Name()),
Config: config.Config,
Middlewares: middlewares,
Handler: mux,
})
if transportErr != nil {
err = errors.Warning("fns: construct proxy failed, new transport failed").WithCause(transportErr)
return
}
return
}
func (p *proxy) Port() int {
return p.transport.Port()
}
func (p *proxy) Run(_ context.Context) (err error) {
err = p.transport.ListenAndServe()
if err != nil {
err = errors.Warning("fns: proxy run failed").WithCause(err)
return
}
return
}
func (p *proxy) Shutdown(ctx context.Context) {
p.transport.Shutdown(ctx)
return
}