96 lines
2.5 KiB
Go
96 lines
2.5 KiB
Go
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// Package httpunix provides a HTTP transport (net/http.RoundTripper)
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// that uses Unix domain sockets instead of HTTP.
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//
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// This is useful for non-browser connections within the same host, as
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// it allows using the file system for credentials of both client
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// and server, and guaranteeing unique names.
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//
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// The URLs look like this:
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//
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// http+unix://LOCATION/PATH_ETC
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//
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// where LOCATION is translated to a file system path with
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// Transport.RegisterLocation, and PATH_ETC follow normal http: scheme
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// conventions.
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package httpunix
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import (
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"bufio"
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"errors"
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"net"
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"net/http"
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"sync"
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"time"
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)
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// Scheme is the URL scheme used for HTTP over UNIX domain sockets.
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const Scheme = "http+unix"
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// Transport is a http.RoundTripper that connects to Unix domain
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// sockets.
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type Transport struct {
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DialTimeout time.Duration
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RequestTimeout time.Duration
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ResponseHeaderTimeout time.Duration
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mu sync.Mutex
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// map a URL "hostname" to a UNIX domain socket path
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loc map[string]string
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}
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// RegisterLocation registers an URL location and maps it to the given
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// file system path.
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//
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// Calling RegisterLocation twice for the same location is a
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// programmer error, and causes a panic.
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func (t *Transport) RegisterLocation(loc string, path string) {
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t.mu.Lock()
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defer t.mu.Unlock()
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if t.loc == nil {
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t.loc = make(map[string]string)
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}
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if _, exists := t.loc[loc]; exists {
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panic("location " + loc + " already registered")
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}
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t.loc[loc] = path
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}
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var _ http.RoundTripper = (*Transport)(nil)
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// RoundTrip executes a single HTTP transaction. See
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// net/http.RoundTripper.
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func (t *Transport) RoundTrip(req *http.Request) (*http.Response, error) {
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if req.URL == nil {
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return nil, errors.New("http+unix: nil Request.URL")
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}
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if req.URL.Scheme != Scheme {
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return nil, errors.New("unsupported protocol scheme: " + req.URL.Scheme)
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}
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if req.URL.Host == "" {
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return nil, errors.New("http+unix: no Host in request URL")
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}
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t.mu.Lock()
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path, ok := t.loc[req.URL.Host]
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t.mu.Unlock()
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if !ok {
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return nil, errors.New("unknown location: " + req.Host)
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}
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c, err := net.DialTimeout("unix", path, t.DialTimeout)
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if err != nil {
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return nil, err
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}
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r := bufio.NewReader(c)
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if t.RequestTimeout > 0 {
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c.SetWriteDeadline(time.Now().Add(t.RequestTimeout))
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}
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if err := req.Write(c); err != nil {
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return nil, err
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}
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if t.ResponseHeaderTimeout > 0 {
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c.SetReadDeadline(time.Now().Add(t.ResponseHeaderTimeout))
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}
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resp, err := http.ReadResponse(r, req)
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return resp, err
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}
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