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// Copyright 2015 Matthew Holt and The Caddy Authors
//
// 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 reverseproxy
import (
"net"
"net/http"
"time"
"github.com/caddyserver/caddy/v2"
)
func init() {
caddy.RegisterModule(HTTPTransport{})
}
// TODO: This is the default transport, basically just http.Transport, but we define JSON struct tags...
type HTTPTransport struct {
// TODO: Actually this is where the TLS config should go, technically...
// as well as keepalives and dial timeouts...
// TODO: It's possible that other transports (like fastcgi) might be
// able to borrow/use at least some of these config fields; if so,
// move them into a type called CommonTransport and embed it
TLS *TLSConfig `json:"tls,omitempty"`
KeepAlive *KeepAlive `json:"keep_alive,omitempty"`
Compression *bool `json:"compression,omitempty"`
MaxConnsPerHost int `json:"max_conns_per_host,omitempty"` // TODO: NOTE: we use our health check stuff to enforce max REQUESTS per host, but this is connections
DialTimeout caddy.Duration `json:"dial_timeout,omitempty"`
FallbackDelay caddy.Duration `json:"dial_fallback_delay,omitempty"`
ResponseHeaderTimeout caddy.Duration `json:"response_header_timeout,omitempty"`
ExpectContinueTimeout caddy.Duration `json:"expect_continue_timeout,omitempty"`
MaxResponseHeaderSize int64 `json:"max_response_header_size,omitempty"`
WriteBufferSize int `json:"write_buffer_size,omitempty"`
ReadBufferSize int `json:"read_buffer_size,omitempty"`
// TODO: ProxyConnectHeader?
RoundTripper http.RoundTripper `json:"-"`
}
// CaddyModule returns the Caddy module information.
func (HTTPTransport) CaddyModule() caddy.ModuleInfo {
return caddy.ModuleInfo{
Name: "http.handlers.reverse_proxy.transport.http",
New: func() caddy.Module { return new(HTTPTransport) },
}
}
func (h *HTTPTransport) Provision(ctx caddy.Context) error {
dialer := &net.Dialer{
Timeout: time.Duration(h.DialTimeout),
FallbackDelay: time.Duration(h.FallbackDelay),
// TODO: Resolver
}
rt := &http.Transport{
DialContext: dialer.DialContext,
MaxConnsPerHost: h.MaxConnsPerHost,
ResponseHeaderTimeout: time.Duration(h.ResponseHeaderTimeout),
ExpectContinueTimeout: time.Duration(h.ExpectContinueTimeout),
MaxResponseHeaderBytes: h.MaxResponseHeaderSize,
WriteBufferSize: h.WriteBufferSize,
ReadBufferSize: h.ReadBufferSize,
}
if h.TLS != nil {
rt.TLSHandshakeTimeout = time.Duration(h.TLS.HandshakeTimeout)
// TODO: rest of TLS config
}
if h.KeepAlive != nil {
dialer.KeepAlive = time.Duration(h.KeepAlive.ProbeInterval)
if enabled := h.KeepAlive.Enabled; enabled != nil {
rt.DisableKeepAlives = !*enabled
}
rt.MaxIdleConns = h.KeepAlive.MaxIdleConns
rt.MaxIdleConnsPerHost = h.KeepAlive.MaxIdleConnsPerHost
rt.IdleConnTimeout = time.Duration(h.KeepAlive.IdleConnTimeout)
}
if h.Compression != nil {
rt.DisableCompression = !*h.Compression
}
h.RoundTripper = rt
return nil
}
func (h HTTPTransport) RoundTrip(req *http.Request) (*http.Response, error) {
return h.RoundTripper.RoundTrip(req)
}
type TLSConfig struct {
CAPool []string `json:"ca_pool,omitempty"`
ClientCertificate string `json:"client_certificate,omitempty"`
InsecureSkipVerify bool `json:"insecure_skip_verify,omitempty"`
HandshakeTimeout caddy.Duration `json:"handshake_timeout,omitempty"`
}
type KeepAlive struct {
Enabled *bool `json:"enabled,omitempty"`
ProbeInterval caddy.Duration `json:"probe_interval,omitempty"`
MaxIdleConns int `json:"max_idle_conns,omitempty"`
MaxIdleConnsPerHost int `json:"max_idle_conns_per_host,omitempty"`
IdleConnTimeout caddy.Duration `json:"idle_timeout,omitempty"` // how long should connections be kept alive when idle
}
var (
defaultDialer = net.Dialer{
Timeout: 10 * time.Second,
KeepAlive: 30 * time.Second,
}
// TODO: does this need to be configured to enable HTTP/2?
defaultTransport = &http.Transport{
DialContext: defaultDialer.DialContext,
TLSHandshakeTimeout: 5 * time.Second,
IdleConnTimeout: 2 * time.Minute,
}
)
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