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http.go
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http.go
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// Copyright 2021 Nitric Technologies Pty Ltd.
//
// 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"
"net"
"sync"
"time"
httppb "github.com/nitrictech/nitric/core/pkg/proto/http/v1"
"github.com/valyala/fasthttp"
)
type HttpServer struct {
Output chan error
host string
lock sync.Mutex
}
type HttpRequestHandler interface {
httppb.HttpServer
HandleRequest(request *fasthttp.Request) (*fasthttp.Response, error)
WorkerCount() int
}
// IsPortOpen returns true if the port is open, false otherwise
// returns false if the timeout elapses before a connection is established
func IsPortOpenWithRetry(host string, connectionTimeout time.Duration, maxRetries int) error {
// Create a channel for signaling when the connection is successful or max retries are reached
done := make(chan error, 1)
defer close(done)
// Create a ticker to periodically attempt the connection
ticker := time.NewTicker(time.Millisecond * 50) // Adjust the interval as needed
defer ticker.Stop()
go func() {
for i := 0; i < maxRetries; i++ {
conn, err := net.DialTimeout("tcp", host, connectionTimeout)
if err == nil {
err = conn.Close()
if err != nil {
done <- fmt.Errorf("error closing connection to %s: %w", host, err)
return
}
done <- nil // Connection successful
return
}
<-ticker.C
}
done <- fmt.Errorf("exceeded maximum retries. Unable to connect to %s", host)
}()
return <-done
}
func (h *HttpServer) WorkerCount() int {
if h.host != "" {
return 1
}
return 0
}
const (
// Dial timeout for initial server check
initialStartTimeout = 5 * time.Second
// Polling interval for liveness check
// portPollInterval = 5 * time.Second
// // Dial timeout when polling
// subsequentTimeout = 25 * time.Millisecond
)
func (h *HttpServer) Proxy(stream httppb.Http_ProxyServer) error {
h.lock.Lock()
defer h.lock.Unlock()
if h.host != "" {
return fmt.Errorf("http server already registered")
}
msg, err := stream.Recv()
if err != nil {
return err
}
if msg.GetRequest() == nil {
return fmt.Errorf("first request must be a proxy request")
}
host := msg.Request.Host
if host == "" {
return fmt.Errorf("host is required")
}
err = IsPortOpenWithRetry(host, initialStartTimeout, 3)
if err != nil {
return fmt.Errorf("host %s failed to respond within %s", host, initialStartTimeout.String())
}
h.host = host
for {
_, err = stream.Recv()
if err != nil {
break
}
}
h.host = ""
h.Output <- fmt.Errorf("HTTP server %s is not available", host)
return err
}
// HandleRequest forwards proxy request to the underlying HTTP server
func (srv *HttpServer) HandleRequest(request *fasthttp.Request) (*fasthttp.Response, error) {
if srv.host == "" {
return nil, fmt.Errorf("http server not registered")
}
requestCopy := &fasthttp.Request{}
var response fasthttp.Response
request.CopyTo(requestCopy)
requestCopy.URI().SetHost(srv.host)
requestCopy.URI().SetScheme("http")
if err := fasthttp.Do(requestCopy, &response); err != nil {
return nil, err
}
return &response, nil
}
func New() *HttpServer {
return &HttpServer{
Output: make(chan error),
}
}