Altair-sh
141 lines
3.2 KiB
Go
141 lines
3.2 KiB
Go
package http
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import (
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"bufio"
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"errors"
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"io"
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"net"
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"os"
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"serveg/internal/log"
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sh "serveg/internal/string_helper"
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"syscall"
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"time"
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)
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const maxHeaderBytes = 16 * 1024
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const initialWriteBufCap = 512
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type mapStrStr map[string]string
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type HeadersMap map[string]string
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type ConnCallback func(req *Request) *Response
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type Connection struct {
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Timeout time.Duration
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log *log.LoggerContext
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callback ConnCallback
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socket *net.TCPConn
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r *bufio.Reader
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wbuf sh.StringBuilder
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// allocated in Connection once
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// hidden to prevent using before ReadRequest/SendResponse
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_req Request // reset by ReadRequest
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_res Response // reset by CreateResponse and ReadRequest
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}
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const defaultTimeout = 30 * time.Second
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func NewConnection(
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socket *net.TCPConn,
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logger *log.LoggerContext,
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callback ConnCallback,
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) *Connection {
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return &Connection{
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Timeout: defaultTimeout,
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log: logger,
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callback: callback,
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socket: socket,
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r: bufio.NewReaderSize(socket, maxHeaderBytes),
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wbuf: sh.StringBuilder{Buf: make([]byte, 0, initialWriteBufCap)},
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_req: Request{
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QueryParams: make(mapStrStr),
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Headers: make(HeadersMap),
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},
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_res: Response{
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Headers: make(HeadersMap),
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},
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}
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}
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func (conn *Connection) Start() {
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defer func() {
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if r := recover(); r != nil {
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conn.log.Error("panic: ", r)
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}
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_ = conn.socket.Close()
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conn.log.Info("connection closed")
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}()
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for {
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err := conn.socket.SetDeadline(time.Now().Add(conn.Timeout))
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if err != nil {
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conn.log.Warn(err)
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return
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}
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var res *Response
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var req *Request
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req, err = conn.ReadRequest()
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if err != nil {
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// invalid request
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if httpErr, ok := errors.AsType[*HttpError](err); ok {
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conn.log.Warn(err)
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res = conn.CreateErrorResponse(req, true, httpErr)
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} else {
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conn.logError(err)
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conn.lingeringClose()
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return
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}
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} else {
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// valid request
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conn.log.Info(req.Method, " ", req.Url, " ", req.Protocol)
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conn.log.Trace("request headers: ", HeadersToString(req.Headers, SecretHeaders))
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res = conn.callback(req)
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if !res.CloseConnection && req.HasUnreadBody() {
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res = conn.CreateErrorResponse(req, true, ErrHasUnreadBody)
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}
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}
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conn.log.Info("sending response: ", res.Status,
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" content-length: ", res.Headers["content-length"])
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conn.log.Trace("response headers: ", HeadersToString(res.Headers, SecretHeaders))
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err = conn.sendResponse(res)
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if err != nil {
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conn.logError(err)
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return
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}
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// it is set by CreateResponse
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if res.CloseConnection {
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conn.lingeringClose()
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return
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}
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}
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}
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func (conn *Connection) logError(err error) {
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if errors.Is(err, os.ErrDeadlineExceeded) {
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conn.log.Info("time out")
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} else if errors.Is(err, io.EOF) ||
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errors.Is(err, syscall.EPIPE) ||
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errors.Is(err, syscall.ECONNRESET) {
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conn.log.Info("closed by client")
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} else {
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conn.log.Error(err)
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}
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}
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// lingeringClose: shut down our side, then drain the client's unread data,
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// so close() doesn't send RST and destroy the response before it's read.
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// Limits: 500 ms, 32 KB
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func (conn *Connection) lingeringClose() {
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conn.log.Info("lingering close")
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if conn.socket.CloseWrite() != nil {
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return
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}
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_ = conn.socket.SetReadDeadline(time.Now().Add(500 * time.Millisecond))
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_, _ = io.Copy(io.Discard, io.LimitReader(conn.socket, 32*1024))
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}
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