mirror of
https://github.com/caddyserver/caddy.git
synced 2024-12-01 05:04:05 +08:00
1e31be8de0
This PR enables the use of placeholders in an upstream's Dial address. A Dial address must represent precisely one socket after replacements. See also #998 and #1639.
536 lines
14 KiB
Go
536 lines
14 KiB
Go
// Copyright 2015 Matthew Holt and The Caddy Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package reverseproxy
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import (
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"net/http"
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"strconv"
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"strings"
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"time"
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"github.com/caddyserver/caddy/v2"
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"github.com/caddyserver/caddy/v2/caddyconfig"
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"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
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"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
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"github.com/caddyserver/caddy/v2/modules/caddyhttp"
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"github.com/caddyserver/caddy/v2/modules/caddyhttp/headers"
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"github.com/dustin/go-humanize"
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)
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func init() {
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httpcaddyfile.RegisterHandlerDirective("reverse_proxy", parseCaddyfile)
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}
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func parseCaddyfile(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
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rp := new(Handler)
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err := rp.UnmarshalCaddyfile(h.Dispenser)
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if err != nil {
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return nil, err
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}
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return rp, nil
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}
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// UnmarshalCaddyfile sets up the handler from Caddyfile tokens. Syntax:
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//
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// reverse_proxy [<matcher>] [<upstreams...>] {
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// # upstreams
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// to <upstreams...>
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//
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// # load balancing
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// lb_policy <name> [<options...>]
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// lb_try_duration <duration>
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// lb_try_interval <interval>
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//
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// # active health checking
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// health_path <path>
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// health_port <port>
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// health_interval <interval>
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// health_timeout <duration>
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// health_status <status>
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// health_body <regexp>
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//
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// # passive health checking
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// max_fails <num>
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// fail_duration <duration>
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// max_conns <num>
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// unhealthy_status <status>
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// unhealthy_latency <duration>
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//
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// # header manipulation
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// header_up [+|-]<field> [<value|regexp> [<replacement>]]
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// header_down [+|-]<field> [<value|regexp> [<replacement>]]
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//
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// # round trip
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// transport <name> {
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// ...
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// }
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// }
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//
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func (h *Handler) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
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for d.Next() {
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for _, up := range d.RemainingArgs() {
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h.Upstreams = append(h.Upstreams, &Upstream{Dial: up})
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}
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for d.NextBlock(0) {
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switch d.Val() {
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case "to":
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args := d.RemainingArgs()
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if len(args) == 0 {
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return d.ArgErr()
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}
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for _, up := range args {
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h.Upstreams = append(h.Upstreams, &Upstream{Dial: up})
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}
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case "lb_policy":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.LoadBalancing != nil && h.LoadBalancing.SelectionPolicyRaw != nil {
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return d.Err("load balancing selection policy already specified")
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}
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name := d.Val()
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mod, err := caddy.GetModule("http.handlers.reverse_proxy.selection_policies." + name)
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if err != nil {
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return d.Errf("getting load balancing policy module '%s': %v", mod.Name, err)
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}
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unm, ok := mod.New().(caddyfile.Unmarshaler)
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if !ok {
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return d.Errf("load balancing policy module '%s' is not a Caddyfile unmarshaler", mod.Name)
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}
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err = unm.UnmarshalCaddyfile(d.NewFromNextTokens())
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if err != nil {
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return err
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}
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sel, ok := unm.(Selector)
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if !ok {
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return d.Errf("module %s is not a Selector", mod.Name)
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}
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if h.LoadBalancing == nil {
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h.LoadBalancing = new(LoadBalancing)
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}
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h.LoadBalancing.SelectionPolicyRaw = caddyconfig.JSONModuleObject(sel, "policy", name, nil)
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case "lb_try_duration":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.LoadBalancing == nil {
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h.LoadBalancing = new(LoadBalancing)
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}
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dur, err := time.ParseDuration(d.Val())
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if err != nil {
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return d.Errf("bad duration value %s: %v", d.Val(), err)
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}
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h.LoadBalancing.TryDuration = caddy.Duration(dur)
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case "lb_try_interval":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.LoadBalancing == nil {
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h.LoadBalancing = new(LoadBalancing)
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}
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dur, err := time.ParseDuration(d.Val())
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if err != nil {
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return d.Errf("bad interval value '%s': %v", d.Val(), err)
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}
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h.LoadBalancing.TryInterval = caddy.Duration(dur)
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case "health_path":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.HealthChecks == nil {
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h.HealthChecks = new(HealthChecks)
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}
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if h.HealthChecks.Active == nil {
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h.HealthChecks.Active = new(ActiveHealthChecks)
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}
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h.HealthChecks.Active.Path = d.Val()
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case "health_port":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.HealthChecks == nil {
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h.HealthChecks = new(HealthChecks)
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}
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if h.HealthChecks.Active == nil {
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h.HealthChecks.Active = new(ActiveHealthChecks)
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}
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portNum, err := strconv.Atoi(d.Val())
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if err != nil {
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return d.Errf("bad port number '%s': %v", d.Val(), err)
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}
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h.HealthChecks.Active.Port = portNum
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case "health_interval":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.HealthChecks == nil {
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h.HealthChecks = new(HealthChecks)
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}
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if h.HealthChecks.Active == nil {
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h.HealthChecks.Active = new(ActiveHealthChecks)
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}
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dur, err := time.ParseDuration(d.Val())
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if err != nil {
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return d.Errf("bad interval value %s: %v", d.Val(), err)
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}
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h.HealthChecks.Active.Interval = caddy.Duration(dur)
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case "health_timeout":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.HealthChecks == nil {
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h.HealthChecks = new(HealthChecks)
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}
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if h.HealthChecks.Active == nil {
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h.HealthChecks.Active = new(ActiveHealthChecks)
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}
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dur, err := time.ParseDuration(d.Val())
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if err != nil {
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return d.Errf("bad timeout value %s: %v", d.Val(), err)
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}
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h.HealthChecks.Active.Timeout = caddy.Duration(dur)
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case "health_status":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.HealthChecks == nil {
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h.HealthChecks = new(HealthChecks)
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}
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if h.HealthChecks.Active == nil {
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h.HealthChecks.Active = new(ActiveHealthChecks)
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}
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val := d.Val()
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if len(val) == 3 && strings.HasSuffix(val, "xx") {
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val = val[:1]
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}
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statusNum, err := strconv.Atoi(val[:1])
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if err != nil {
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return d.Errf("bad status value '%s': %v", d.Val(), err)
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}
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h.HealthChecks.Active.ExpectStatus = statusNum
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case "health_body":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.HealthChecks == nil {
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h.HealthChecks = new(HealthChecks)
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}
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if h.HealthChecks.Active == nil {
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h.HealthChecks.Active = new(ActiveHealthChecks)
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}
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h.HealthChecks.Active.ExpectBody = d.Val()
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case "max_fails":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.HealthChecks == nil {
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h.HealthChecks = new(HealthChecks)
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}
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if h.HealthChecks.Passive == nil {
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h.HealthChecks.Passive = new(PassiveHealthChecks)
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}
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maxFails, err := strconv.Atoi(d.Val())
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if err != nil {
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return d.Errf("invalid maximum fail count '%s': %v", d.Val(), err)
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}
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h.HealthChecks.Passive.MaxFails = maxFails
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case "fail_duration":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.HealthChecks == nil {
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h.HealthChecks = new(HealthChecks)
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}
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if h.HealthChecks.Passive == nil {
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h.HealthChecks.Passive = new(PassiveHealthChecks)
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}
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dur, err := time.ParseDuration(d.Val())
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if err != nil {
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return d.Errf("bad duration value '%s': %v", d.Val(), err)
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}
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h.HealthChecks.Passive.FailDuration = caddy.Duration(dur)
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case "unhealthy_request_count":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.HealthChecks == nil {
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h.HealthChecks = new(HealthChecks)
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}
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if h.HealthChecks.Passive == nil {
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h.HealthChecks.Passive = new(PassiveHealthChecks)
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}
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maxConns, err := strconv.Atoi(d.Val())
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if err != nil {
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return d.Errf("invalid maximum connection count '%s': %v", d.Val(), err)
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}
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h.HealthChecks.Passive.UnhealthyRequestCount = maxConns
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case "unhealthy_status":
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args := d.RemainingArgs()
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if len(args) == 0 {
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return d.ArgErr()
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}
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if h.HealthChecks == nil {
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h.HealthChecks = new(HealthChecks)
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}
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if h.HealthChecks.Passive == nil {
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h.HealthChecks.Passive = new(PassiveHealthChecks)
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}
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for _, arg := range args {
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if len(arg) == 3 && strings.HasSuffix(arg, "xx") {
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arg = arg[:1]
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}
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statusNum, err := strconv.Atoi(arg[:1])
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if err != nil {
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return d.Errf("bad status value '%s': %v", d.Val(), err)
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}
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h.HealthChecks.Passive.UnhealthyStatus = append(h.HealthChecks.Passive.UnhealthyStatus, statusNum)
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}
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case "unhealthy_latency":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.HealthChecks == nil {
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h.HealthChecks = new(HealthChecks)
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}
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if h.HealthChecks.Passive == nil {
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h.HealthChecks.Passive = new(PassiveHealthChecks)
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}
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dur, err := time.ParseDuration(d.Val())
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if err != nil {
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return d.Errf("bad duration value '%s': %v", d.Val(), err)
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}
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h.HealthChecks.Passive.UnhealthyLatency = caddy.Duration(dur)
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case "header_up":
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if h.Headers == nil {
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h.Headers = new(headers.Handler)
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}
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if h.Headers.Request == nil {
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h.Headers.Request = new(headers.HeaderOps)
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}
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args := d.RemainingArgs()
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switch len(args) {
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case 1:
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headers.CaddyfileHeaderOp(h.Headers.Request, args[0], "", "")
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case 2:
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headers.CaddyfileHeaderOp(h.Headers.Request, args[0], args[1], "")
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case 3:
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headers.CaddyfileHeaderOp(h.Headers.Request, args[0], args[1], args[2])
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default:
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return d.ArgErr()
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}
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case "header_down":
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if h.Headers == nil {
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h.Headers = new(headers.Handler)
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}
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if h.Headers.Response == nil {
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h.Headers.Response = &headers.RespHeaderOps{
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HeaderOps: new(headers.HeaderOps),
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}
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}
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args := d.RemainingArgs()
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switch len(args) {
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case 1:
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headers.CaddyfileHeaderOp(h.Headers.Response.HeaderOps, args[0], "", "")
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case 2:
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headers.CaddyfileHeaderOp(h.Headers.Response.HeaderOps, args[0], args[1], "")
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case 3:
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headers.CaddyfileHeaderOp(h.Headers.Response.HeaderOps, args[0], args[1], args[2])
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default:
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return d.ArgErr()
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}
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case "transport":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.TransportRaw != nil {
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return d.Err("transport already specified")
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}
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name := d.Val()
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mod, err := caddy.GetModule("http.handlers.reverse_proxy.transport." + name)
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if err != nil {
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return d.Errf("getting transport module '%s': %v", mod.Name, err)
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}
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unm, ok := mod.New().(caddyfile.Unmarshaler)
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if !ok {
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return d.Errf("transport module '%s' is not a Caddyfile unmarshaler", mod.Name)
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}
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err = unm.UnmarshalCaddyfile(d.NewFromNextTokens())
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if err != nil {
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return err
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}
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rt, ok := unm.(http.RoundTripper)
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if !ok {
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return d.Errf("module %s is not a RoundTripper", mod.Name)
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}
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h.TransportRaw = caddyconfig.JSONModuleObject(rt, "protocol", name, nil)
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default:
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return d.Errf("unrecognized subdirective %s", d.Val())
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}
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}
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}
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return nil
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}
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// UnmarshalCaddyfile deserializes Caddyfile tokens into h.
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//
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// transport http {
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// read_buffer <size>
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// write_buffer <size>
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// dial_timeout <duration>
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// tls_client_auth <cert_file> <key_file>
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// tls_insecure_skip_verify
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// tls_timeout <duration>
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// keepalive [off|<duration>]
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// keepalive_idle_conns <max_count>
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// }
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//
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func (h *HTTPTransport) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
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for d.Next() {
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for d.NextBlock(0) {
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switch d.Val() {
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case "read_buffer":
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if !d.NextArg() {
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return d.ArgErr()
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}
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size, err := humanize.ParseBytes(d.Val())
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if err != nil {
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return d.Errf("invalid read buffer size '%s': %v", d.Val(), err)
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}
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h.ReadBufferSize = int(size)
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case "write_buffer":
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if !d.NextArg() {
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return d.ArgErr()
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}
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size, err := humanize.ParseBytes(d.Val())
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if err != nil {
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return d.Errf("invalid write buffer size '%s': %v", d.Val(), err)
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}
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h.WriteBufferSize = int(size)
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case "dial_timeout":
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if !d.NextArg() {
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return d.ArgErr()
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}
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dur, err := time.ParseDuration(d.Val())
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if err != nil {
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return d.Errf("bad timeout value '%s': %v", d.Val(), err)
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}
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h.DialTimeout = caddy.Duration(dur)
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case "tls_client_auth":
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args := d.RemainingArgs()
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if len(args) != 2 {
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return d.ArgErr()
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}
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if h.TLS == nil {
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h.TLS = new(TLSConfig)
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}
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h.TLS.ClientCertificateFile = args[0]
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h.TLS.ClientCertificateKeyFile = args[1]
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case "tls":
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if h.TLS == nil {
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h.TLS = new(TLSConfig)
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}
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case "tls_insecure_skip_verify":
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if d.NextArg() {
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return d.ArgErr()
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}
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if h.TLS == nil {
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h.TLS = new(TLSConfig)
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}
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h.TLS.InsecureSkipVerify = true
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case "tls_timeout":
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if !d.NextArg() {
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return d.ArgErr()
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}
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dur, err := time.ParseDuration(d.Val())
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if err != nil {
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return d.Errf("bad timeout value '%s': %v", d.Val(), err)
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}
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if h.TLS == nil {
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h.TLS = new(TLSConfig)
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}
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h.TLS.HandshakeTimeout = caddy.Duration(dur)
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case "keepalive":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if h.KeepAlive == nil {
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h.KeepAlive = new(KeepAlive)
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}
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if d.Val() == "off" {
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var disable bool
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h.KeepAlive.Enabled = &disable
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break
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}
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dur, err := time.ParseDuration(d.Val())
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if err != nil {
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return d.Errf("bad duration value '%s': %v", d.Val(), err)
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}
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h.KeepAlive.IdleConnTimeout = caddy.Duration(dur)
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case "keepalive_idle_conns":
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if !d.NextArg() {
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return d.ArgErr()
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}
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num, err := strconv.Atoi(d.Val())
|
|
if err != nil {
|
|
return d.Errf("bad integer value '%s': %v", d.Val(), err)
|
|
}
|
|
if h.KeepAlive == nil {
|
|
h.KeepAlive = new(KeepAlive)
|
|
}
|
|
h.KeepAlive.MaxIdleConns = num
|
|
h.KeepAlive.MaxIdleConnsPerHost = num
|
|
|
|
default:
|
|
return d.Errf("unrecognized subdirective %s", d.Val())
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Interface guards
|
|
var (
|
|
_ caddyfile.Unmarshaler = (*Handler)(nil)
|
|
_ caddyfile.Unmarshaler = (*HTTPTransport)(nil)
|
|
)
|