/
httpproxy.go
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/
httpproxy.go
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// Copyright Nitric Pty Ltd.
//
// SPDX-License-Identifier: Apache-2.0
//
// 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 http
import (
"fmt"
"maps"
"sync"
"github.com/asaskevich/EventBus"
"github.com/valyala/fasthttp"
"github.com/nitrictech/cli/pkg/grpcx"
httppb "github.com/nitrictech/nitric/core/pkg/proto/http/v1"
"github.com/nitrictech/nitric/core/pkg/workers/http"
)
type HttpProxyService struct {
ServiceName string
server *http.HttpServer
}
type HostAddress = string
type State = map[HostAddress]*HttpProxyService
type LocalHttpProxy struct {
state State
httpWorkerLock sync.RWMutex
bus EventBus.Bus
}
const localHttpProxyTopic = "local_http_proxy"
func (l *LocalHttpProxy) publishState() {
l.bus.Publish(localHttpProxyTopic, maps.Clone(l.state))
}
func (l *LocalHttpProxy) SubscribeToState(fn func(State)) {
// ignore the error, it's only returned if the fn param isn't a function
_ = l.bus.Subscribe(localHttpProxyTopic, fn)
}
var _ httppb.HttpServer = (*LocalHttpProxy)(nil)
func (h *LocalHttpProxy) WorkerCount() int {
h.httpWorkerLock.RLock()
defer h.httpWorkerLock.RUnlock()
return len(h.state)
}
func (h *LocalHttpProxy) GetState() State {
h.httpWorkerLock.RLock()
defer h.httpWorkerLock.RUnlock()
return h.state
}
// FIXME: Implement http server identification
func (h *LocalHttpProxy) HandleRequest(request *fasthttp.Request) (*fasthttp.Response, error) {
h.httpWorkerLock.RLock()
defer h.httpWorkerLock.RUnlock()
host := string(request.Host())
service, ok := h.state[host]
if !ok {
return nil, fmt.Errorf("no worker found for host: %s", host)
}
return service.server.HandleRequest(request)
}
func (h *LocalHttpProxy) registerHttpProxy(host string, service *HttpProxyService) {
h.httpWorkerLock.Lock()
defer h.httpWorkerLock.Unlock()
// pterm.Error.Printfln("got a http proxy")
h.state[host] = service
h.publishState()
}
func (h *LocalHttpProxy) unregisterHttpProxy(host string) {
h.httpWorkerLock.Lock()
defer h.httpWorkerLock.Unlock()
delete(h.state, host)
h.publishState()
}
func (h *LocalHttpProxy) Proxy(stream httppb.Http_ProxyServer) error {
serviceName, err := grpcx.GetServiceNameFromStream(stream)
if err != nil {
return err
}
peekableStream := grpcx.NewPeekableStreamServer(stream)
firstRequest, err := peekableStream.Peek()
if err != nil {
return err
}
if firstRequest.Request == nil {
return fmt.Errorf("first request must be a proxy request")
}
host := firstRequest.Request.GetHost()
srv := http.New()
h.registerHttpProxy(host, &HttpProxyService{
server: srv,
ServiceName: serviceName,
})
defer h.unregisterHttpProxy(host)
// pass down the the original handler for port watching and management
// let the proxy manage the connection
return srv.Proxy(peekableStream)
}
func NewLocalHttpProxyService() *LocalHttpProxy {
return &LocalHttpProxy{
state: make(State),
httpWorkerLock: sync.RWMutex{},
bus: EventBus.New(),
}
}