Sebastiaan van Stijn
478d9b19a2
full diff: https://github.com/docker/go-connections/compare/v0.6.0...v0.7.0 Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
67 lines
2.0 KiB
Go
67 lines
2.0 KiB
Go
// Package sockets provides helper functions to create and configure Unix or TCP sockets.
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package sockets
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import (
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"context"
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"errors"
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"fmt"
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"net"
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"net/http"
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"syscall"
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"time"
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)
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const (
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defaultTimeout = 10 * time.Second
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maxUnixSocketPathSize = len(syscall.RawSockaddrUnix{}.Path)
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)
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// ErrProtocolNotAvailable is returned when a given transport protocol is not provided by the operating system.
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var ErrProtocolNotAvailable = errors.New("protocol not available")
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// ConfigureTransport configures the specified [http.Transport] according to the specified proto
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// and addr.
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//
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// If the proto is unix (using a unix socket to communicate) or npipe the compression is disabled.
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// For other protos, compression is enabled. If you want to manually enable/disable compression,
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// make sure you do it _after_ any subsequent calls to ConfigureTransport is made against the same
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// [http.Transport].
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func ConfigureTransport(tr *http.Transport, proto, addr string) error {
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if tr.MaxIdleConns == 0 {
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// prevent long-lived processes from leaking connections
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// due to idle connections not being released.
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//
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// TODO: see if we can also address this from the server side; see: https://github.com/moby/moby/issues/45539
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tr.MaxIdleConns = 6
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tr.IdleConnTimeout = 30 * time.Second
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}
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switch proto {
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case "unix":
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return configureUnixTransport(tr, addr)
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case "npipe":
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return configureNpipeTransport(tr, addr)
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default:
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tr.Proxy = http.ProxyFromEnvironment
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tr.DisableCompression = false
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tr.DialContext = (&net.Dialer{
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Timeout: defaultTimeout,
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}).DialContext
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}
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return nil
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}
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func configureUnixTransport(tr *http.Transport, addr string) error {
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if len(addr) > maxUnixSocketPathSize {
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return fmt.Errorf("unix socket path %q is too long", addr)
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}
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// No need for compression in local communications.
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tr.DisableCompression = true
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dialer := &net.Dialer{
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Timeout: defaultTimeout,
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}
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tr.DialContext = func(ctx context.Context, _, _ string) (net.Conn, error) {
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return dialer.DialContext(ctx, "unix", addr)
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}
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return nil
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}
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