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Code Issues Actions Packages Projects Releases Wiki Activity

events: Implement event system (#4912)

Browse Source 
Co-authored-by: Matt Holt <mholt@users.noreply.github.com>
This commit is contained in:
Francis Lavoie 2022-08-31 17:01:30 -04:00 committed by GitHub
parent 68d8ac9802
commit d4d8bbcfc6
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
13 changed files with 569 additions and 34 deletions
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68
context.go
View File

@ -37,9 +37,10 @@ import (
// not actually need to do this).
type Context struct {
context.Context
moduleInstances map[string][]any
moduleInstances map[string][]Module
cfg *Config
cleanupFuncs []func()
ancestry []Module
}
// NewContext provides a new context derived from the given
@ -51,7 +52,7 @@ type Context struct {
// modules which are loaded will be properly unloaded.
// See standard library context package's documentation.
func NewContext(ctx Context) (Context, context.CancelFunc) {
newCtx := Context{moduleInstances: make(map[string][]any), cfg: ctx.cfg}
newCtx := Context{moduleInstances: make(map[string][]Module), cfg: ctx.cfg}
c, cancel := context.WithCancel(ctx.Context)
wrappedCancel := func() {
cancel()
@ -90,15 +91,15 @@ func (ctx *Context) OnCancel(f func()) {
// ModuleMap may be used in place of map[string]json.RawMessage. The return value's
// underlying type mirrors the input field's type:
//
// json.RawMessage => any
// []json.RawMessage => []any
// [][]json.RawMessage => [][]any
// map[string]json.RawMessage => map[string]any
// []map[string]json.RawMessage => []map[string]any
// json.RawMessage => any
// []json.RawMessage => []any
// [][]json.RawMessage => [][]any
// map[string]json.RawMessage => map[string]any
// []map[string]json.RawMessage => []map[string]any
//
// The field must have a "caddy" struct tag in this format:
//
// caddy:"key1=val1 key2=val2"
// caddy:"key1=val1 key2=val2"
//
// To load modules, a "namespace" key is required. For example, to load modules
// in the "http.handlers" namespace, you'd put: `namespace=http.handlers` in the
@ -115,7 +116,7 @@ func (ctx *Context) OnCancel(f func()) {
// meaning the key containing the module's name that is defined inline with the module
// itself. You must specify the inline key in a struct tag, along with the namespace:
//
// caddy:"namespace=http.handlers inline_key=handler"
// caddy:"namespace=http.handlers inline_key=handler"
//
// This will look for a key/value pair like `"handler": "..."` in the json.RawMessage
// in order to know the module name.
@ -301,17 +302,17 @@ func (ctx Context) loadModuleMap(namespace string, val reflect.Value) (map[strin
// like from embedded scripts, etc.
func (ctx Context) LoadModuleByID(id string, rawMsg json.RawMessage) (any, error) {
modulesMu.RLock()
mod, ok := modules[id]
modInfo, ok := modules[id]
modulesMu.RUnlock()
if !ok {
return nil, fmt.Errorf("unknown module: %s", id)
}
if mod.New == nil {
return nil, fmt.Errorf("module '%s' has no constructor", mod.ID)
if modInfo.New == nil {
return nil, fmt.Errorf("module '%s' has no constructor", modInfo.ID)
}
val := mod.New().(any)
val := modInfo.New()
// value must be a pointer for unmarshaling into concrete type, even if
// the module's concrete type is a slice or map; New() *should* return
@ -327,7 +328,7 @@ func (ctx Context) LoadModuleByID(id string, rawMsg json.RawMessage) (any, error
if len(rawMsg) > 0 {
err := strictUnmarshalJSON(rawMsg, &val)
if err != nil {
return nil, fmt.Errorf("decoding module config: %s: %v", mod, err)
return nil, fmt.Errorf("decoding module config: %s: %v", modInfo, err)
}
}
@ -340,6 +341,8 @@ func (ctx Context) LoadModuleByID(id string, rawMsg json.RawMessage) (any, error
return nil, fmt.Errorf("module value cannot be null")
}
ctx.ancestry = append(ctx.ancestry, val)
if prov, ok := val.(Provisioner); ok {
err := prov.Provision(ctx)
if err != nil {
@ -351,7 +354,7 @@ func (ctx Context) LoadModuleByID(id string, rawMsg json.RawMessage) (any, error
err = fmt.Errorf("%v; additionally, cleanup: %v", err, err2)
}
}
return nil, fmt.Errorf("provision %s: %v", mod, err)
return nil, fmt.Errorf("provision %s: %v", modInfo, err)
}
}
@ -365,7 +368,7 @@ func (ctx Context) LoadModuleByID(id string, rawMsg json.RawMessage) (any, error
err = fmt.Errorf("%v; additionally, cleanup: %v", err, err2)
}
}
return nil, fmt.Errorf("%s: invalid configuration: %v", mod, err)
return nil, fmt.Errorf("%s: invalid configuration: %v", modInfo, err)
}
}
@ -439,8 +442,10 @@ func (ctx Context) Storage() certmagic.Storage {
return ctx.cfg.storage
}
// TODO: aw man, can I please change this?
// Logger returns a logger that can be used by mod.
func (ctx Context) Logger(mod Module) *zap.Logger {
// TODO: if mod is nil, use ctx.Module() instead...
if ctx.cfg == nil {
// often the case in tests; just use a dev logger
l, err := zap.NewDevelopment()
@ -451,3 +456,34 @@ func (ctx Context) Logger(mod Module) *zap.Logger {
}
return ctx.cfg.Logging.Logger(mod)
}
// TODO: use this
// // Logger returns a logger that can be used by the current module.
// func (ctx Context) Log() *zap.Logger {
// if ctx.cfg == nil {
// // often the case in tests; just use a dev logger
// l, err := zap.NewDevelopment()
// if err != nil {
// panic("config missing, unable to create dev logger: " + err.Error())
// }
// return l
// }
// return ctx.cfg.Logging.Logger(ctx.Module())
// }
// Modules returns the lineage of modules that this context provisioned,
// with the most recent/current module being last in the list.
func (ctx Context) Modules() []Module {
mods := make([]Module, len(ctx.ancestry))
copy(mods, ctx.ancestry)
return mods
}
// Module returns the current module, or the most recent one
// provisioned by the context.
func (ctx Context) Module() Module {
if len(ctx.ancestry) == 0 {
return nil
}
return ctx.ancestry[len(ctx.ancestry)-1]
}

2
go.mod
View File

@ -7,7 +7,7 @@ require (
github.com/Masterminds/sprig/v3 v3.2.2
github.com/alecthomas/chroma v0.10.0
github.com/aryann/difflib v0.0.0-20210328193216-ff5ff6dc229b
github.com/caddyserver/certmagic v0.16.3
github.com/caddyserver/certmagic v0.17.0
github.com/dustin/go-humanize v1.0.1-0.20200219035652-afde56e7acac
github.com/go-chi/chi v4.1.2+incompatible
github.com/google/cel-go v0.12.4

4
go.sum
View File

@ -131,8 +131,8 @@ github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6r
github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
github.com/bketelsen/crypt v0.0.3-0.20200106085610-5cbc8cc4026c/go.mod h1:MKsuJmJgSg28kpZDP6UIiPt0e0Oz0kqKNGyRaWEPv84=
github.com/boltdb/bolt v1.3.1/go.mod h1:clJnj/oiGkjum5o1McbSZDSLxVThjynRyGBgiAx27Ps=
github.com/caddyserver/certmagic v0.16.3 h1:1ZbiU7y5X0MnDjBTXywUbPMs/ScHbgCeeCy/LPh4IZk=
github.com/caddyserver/certmagic v0.16.3/go.mod h1:pSS2aZcdKlrTZrb2DKuRafckx20o5Fz1EdDKEB8KOQM=
github.com/caddyserver/certmagic v0.17.0 h1:AHHvvmv6SNcq0vK5BgCevQqYMV8GNprVk6FWZzx8d+Q=
github.com/caddyserver/certmagic v0.17.0/go.mod h1:pSS2aZcdKlrTZrb2DKuRafckx20o5Fz1EdDKEB8KOQM=
github.com/casbin/casbin/v2 v2.1.2/go.mod h1:YcPU1XXisHhLzuxH9coDNf2FbKpjGlbCg3n9yuLkIJQ=
github.com/cenkalti/backoff v2.2.1+incompatible/go.mod h1:90ReRw6GdpyfrHakVjL/QHaoyV4aDUVVkXQJJJ3NXXM=
github.com/cenkalti/backoff/v3 v3.0.0/go.mod h1:cIeZDE3IrqwwJl6VUwCN6trj1oXrTS4rc0ij+ULvLYs=

367
modules/caddyevents/app.go Normal file
View File

@ -0,0 +1,367 @@
// 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 caddyevents
import (
"context"
"encoding/json"
"errors"
"fmt"
"strings"
"time"
"github.com/caddyserver/caddy/v2"
"github.com/google/uuid"
"go.uber.org/zap"
)
func init() {
caddy.RegisterModule(App{})
}
// App implements a global eventing system within Caddy.
// Modules can emit and subscribe to events, providing
// hooks into deep parts of the code base that aren't
// otherwise accessible. Events provide information about
// what and when things are happening, and this facility
// allows handlers to take action when events occur,
// add information to the event's metadata, and even
// control program flow in some cases.
//
// Events are propagated in a DOM-like fashion. An event
// emitted from module `a.b.c` (the "origin") will first
// invoke handlers listening to `a.b.c`, then `a.b`,
// then `a`, then those listening regardless of origin.
// If a handler returns the special error Aborted, then
// propagation immediately stops and the event is marked
// as aborted. Emitters may optionally choose to adjust
// program flow based on an abort.
//
// Modules can subscribe to events by origin and/or name.
// A handler is invoked only if it is subscribed to the
// event by name and origin. Subscriptions should be
// registered during the provisioning phase, before apps
// are started.
//
// Event handlers are fired synchronously as part of the
// regular flow of the program. This allows event handlers
// to control the flow of the program if the origin permits
// it and also allows handlers to convey new information
// back into the origin module before it continues.
// In essence, event handlers are similar to HTTP
// middleware handlers.
//
// Event bindings/subscribers are unordered; i.e.
// event handlers are invoked in an arbitrary order.
// Event handlers should not rely on the logic of other
// handlers to succeed.
//
// The entirety of this app module is EXPERIMENTAL and
// subject to change. Pay attention to release notes.
type App struct {
// Subscriptions bind handlers to one or more events
// either globally or scoped to specific modules or module
// namespaces.
Subscriptions []*Subscription `json:"subscriptions,omitempty"`
// Map of event name to map of module ID/namespace to handlers
subscriptions map[string]map[caddy.ModuleID][]Handler
logger *zap.Logger
started bool
}
// Subscription represents binding of one or more handlers to
// one or more events.
type Subscription struct {
// The name(s) of the event(s) to bind to. Default: all events.
Events []string `json:"events,omitempty"`
// The ID or namespace of the module(s) from which events
// originate to listen to for events. Default: all modules.
//
// Events propagate up, so events emitted by module "a.b.c"
// will also trigger the event for "a.b" and "a". Thus, to
// receive all events from "a.b.c" and "a.b.d", for example,
// one can subscribe to either "a.b" or all of "a" entirely.
Modules []caddy.ModuleID `json:"modules,omitempty"`
// The event handler modules. These implement the actual
// behavior to invoke when an event occurs. At least one
// handler is required.
HandlersRaw []json.RawMessage `json:"handlers,omitempty" caddy:"namespace=events.handlers inline_key=handler"`
// The decoded handlers; Go code that is subscribing to
// an event should set this field directly; HandlersRaw
// is meant for JSON configuration to fill out this field.
Handlers []Handler `json:"-"`
}
// CaddyModule returns the Caddy module information.
func (App) CaddyModule() caddy.ModuleInfo {
return caddy.ModuleInfo{
ID: "events",
New: func() caddy.Module { return new(App) },
}
}
// Provision sets up the app.
func (app *App) Provision(ctx caddy.Context) error {
app.logger = ctx.Logger(app)
app.subscriptions = make(map[string]map[caddy.ModuleID][]Handler)
for _, sub := range app.Subscriptions {
if sub.HandlersRaw != nil {
handlersIface, err := ctx.LoadModule(sub, "HandlersRaw")
if err != nil {
return fmt.Errorf("loading event subscriber modules: %v", err)
}
for _, h := range handlersIface.([]any) {
sub.Handlers = append(sub.Handlers, h.(Handler))
}
if len(sub.Handlers) == 0 {
// pointless to bind without any handlers
return fmt.Errorf("no handlers defined")
}
}
}
return nil
}
// Start runs the app.
func (app *App) Start() error {
for _, sub := range app.Subscriptions {
if err := app.Subscribe(sub); err != nil {
return err
}
}
app.started = true
return nil
}
// Stop gracefully shuts down the app.
func (app *App) Stop() error {
return nil
}
// Subscribe binds one or more event handlers to one or more events
// according to the subscription s. For now, subscriptions can only
// be created during the provision phase; new bindings cannot be
// created after the events app has started.
func (app *App) Subscribe(s *Subscription) error {
if app.started {
return fmt.Errorf("events already started; new subscriptions closed")
}
// handle special case of catch-alls (omission of event name or module space implies all)
if len(s.Events) == 0 {
s.Events = []string{""}
}
if len(s.Modules) == 0 {
s.Modules = []caddy.ModuleID{""}
}
for _, eventName := range s.Events {
if app.subscriptions[eventName] == nil {
app.subscriptions[eventName] = make(map[caddy.ModuleID][]Handler)
}
for _, originModule := range s.Modules {
app.subscriptions[eventName][originModule] = append(app.subscriptions[eventName][originModule], s.Handlers...)
}
}
return nil
}
// On is syntactic sugar for Subscribe() that binds a single handler
// to a single event from any module. If the eventName is empty string,
// it counts for all events.
func (app *App) On(eventName string, handler Handler) error {
return app.Subscribe(&Subscription{
Events: []string{eventName},
Handlers: []Handler{handler},
})
}
// Emit creates and dispatches an event named eventName to all relevant handlers with
// the metadata data. Events are emitted and propagated synchronously. The returned Event
// value will have any additional information from the invoked handlers.
func (app *App) Emit(ctx caddy.Context, eventName string, data map[string]any) Event {
id, err := uuid.NewRandom()
if err != nil {
app.logger.Error("failed generating new event ID",
zap.Error(err),
zap.String("event", eventName))
}
eventName = strings.ToLower(eventName)
e := Event{
id: id,
ts: time.Now(),
name: eventName,
origin: ctx.Module(),
data: data,
}
// add event info to replacer, make sure it's in the context
repl, ok := ctx.Context.Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
if !ok {
repl = caddy.NewReplacer()
ctx.Context = context.WithValue(ctx.Context, caddy.ReplacerCtxKey, repl)
}
repl.Map(func(key string) (any, bool) {
switch key {
case "event":
return e, true
case "event.id":
return e.id, true
case "event.name":
return e.name, true
case "event.time":
return e.ts, true
case "event.time_unix":
return e.ts.UnixMilli(), true
case "event.module":
return e.origin.CaddyModule().ID, true
case "event.data":
return e.data, true
}
if strings.HasPrefix(key, "event.data.") {
key = strings.TrimPrefix(key, "event.data.")
if val, ok := data[key]; ok {
return val, true
}
}
return nil, false
})
app.logger.Debug("event",
zap.String("name", e.name),
zap.String("id", e.id.String()),
zap.String("origin", e.origin.CaddyModule().String()),
zap.Any("data", e.data),
)
// invoke handlers bound to the event by name and also all events; this for loop
// iterates twice at most: once for the event name, once for "" (all events)
for {
moduleID := e.origin.CaddyModule().ID
// implement propagation up the module tree (i.e. start with "a.b.c" then "a.b" then "a" then "")
for {
if app.subscriptions[eventName] == nil {
break // shortcut if event not bound at all
}
for _, handler := range app.subscriptions[eventName][moduleID] {
if err := handler.Handle(ctx, e); err != nil {
aborted := errors.Is(err, ErrAborted)
app.logger.Error("handler error",
zap.Error(err),
zap.Bool("aborted", aborted))
if aborted {
e.Aborted = err
return e
}
}
}
if moduleID == "" {
break
}
lastDot := strings.LastIndex(string(moduleID), ".")
if lastDot < 0 {
moduleID = "" // include handlers bound to events regardless of module
} else {
moduleID = moduleID[:lastDot]
}
}
// include handlers listening to all events
if eventName == "" {
break
}
eventName = ""
}
return e
}
// Event represents something that has happened or is happening.
type Event struct {
id uuid.UUID
ts time.Time
name string
origin caddy.Module
data map[string]any
// If non-nil, the event has been aborted, meaning
// propagation has stopped to other handlers and
// the code should stop what it was doing. Emitters
// may choose to use this as a signal to adjust their
// code path appropriately.
Aborted error
}
// CloudEvent exports event e as a structure that, when
// serialized as JSON, is compatible with the
// CloudEvents spec.
func (e Event) CloudEvent() CloudEvent {
dataJSON, _ := json.Marshal(e.data)
return CloudEvent{
ID: e.id.String(),
Source: e.origin.CaddyModule().String(),
SpecVersion: "1.0",
Type: e.name,
Time: e.ts,
DataContentType: "application/json",
Data: dataJSON,
}
}
// CloudEvent is a JSON-serializable structure that
// is compatible with the CloudEvents specification.
// See https://cloudevents.io.
type CloudEvent struct {
ID string `json:"id"`
Source string `json:"source"`
SpecVersion string `json:"specversion"`
Type string `json:"type"`
Time time.Time `json:"time"`
DataContentType string `json:"datacontenttype,omitempty"`
Data json.RawMessage `json:"data,omitempty"`
}
// ErrAborted cancels an event.
var ErrAborted = errors.New("event aborted")
// Handler is a type that can handle events.
type Handler interface {
Handle(context.Context, Event) error
}
// Interface guards
var (
_ caddy.App = (*App)(nil)
_ caddy.Provisioner = (*App)(nil)
)

88
modules/caddyevents/eventsconfig/caddyfile.go Normal file
View File

@ -0,0 +1,88 @@
// 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 eventsconfig is for configuring caddyevents.App with the
// Caddyfile. This code can't be in the caddyevents package because
// the httpcaddyfile package imports caddyhttp, which imports
// caddyevents: hence, it creates an import cycle.
package eventsconfig
import (
"encoding/json"
"github.com/caddyserver/caddy/v2/caddyconfig"
"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
"github.com/caddyserver/caddy/v2/modules/caddyevents"
)
func init() {
httpcaddyfile.RegisterGlobalOption("events", parseApp)
}
// parseApp configures the "events" global option from Caddyfile to set up the events app.
// Syntax:
//
// events {
// on <event> <handler_module...>
// }
//
// If <event> is *, then it will bind to all events.
func parseApp(d *caddyfile.Dispenser, _ any) (any, error) {
app := new(caddyevents.App)
// consume the option name
if !d.Next() {
return nil, d.ArgErr()
}
// handle the block
for d.NextBlock(0) {
switch d.Val() {
case "on":
if !d.NextArg() {
return nil, d.ArgErr()
}
eventName := d.Val()
if eventName == "*" {
eventName = ""
}
if !d.NextArg() {
return nil, d.ArgErr()
}
handlerName := d.Val()
modID := "events.handlers." + handlerName
unm, err := caddyfile.UnmarshalModule(d, modID)
if err != nil {
return nil, err
}
app.Subscriptions = append(app.Subscriptions, &caddyevents.Subscription{
Events: []string{eventName},
HandlersRaw: []json.RawMessage{
caddyconfig.JSONModuleObject(unm, "handler", handlerName, nil),
},
})
default:
return nil, d.ArgErr()
}
}
return httpcaddyfile.App{
Name: "events",
Value: caddyconfig.JSON(app, nil),
}, nil
}

8
modules/caddyhttp/app.go
View File

@ -24,6 +24,7 @@ import (
"time"
"github.com/caddyserver/caddy/v2"
"github.com/caddyserver/caddy/v2/modules/caddyevents"
"github.com/caddyserver/caddy/v2/modules/caddytls"
"go.uber.org/zap"
"golang.org/x/net/http2"
@ -161,6 +162,11 @@ func (app *App) Provision(ctx caddy.Context) error {
app.ctx = ctx
app.logger = ctx.Logger(app)
eventsAppIface, err := ctx.App("events")
if err != nil {
return fmt.Errorf("getting events app: %v", err)
}
repl := caddy.NewReplacer()
// this provisions the matchers for each route,
@ -175,6 +181,8 @@ func (app *App) Provision(ctx caddy.Context) error {
for srvName, srv := range app.Servers {
srv.name = srvName
srv.tlsApp = app.tlsApp
srv.events = eventsAppIface.(*caddyevents.App)
srv.ctx = ctx
srv.logger = app.logger.Named("log")
srv.errorLogger = app.logger.Named("log.error")
srv.shutdownAtMu = new(sync.RWMutex)

18
modules/caddyhttp/reverseproxy/healthchecks.go
View File

@ -284,6 +284,13 @@ func (h *Handler) doActiveHealthCheck(dialInfo DialInfo, hostAddr string, upstre
}
}
markUnhealthy := func() {
// dispatch an event that the host newly became unhealthy
if upstream.setHealthy(false) {
h.events.Emit(h.ctx, "unhealthy", map[string]any{"host": hostAddr})
}
}
// do the request, being careful to tame the response body
resp, err := h.HealthChecks.Active.httpClient.Do(req)
if err != nil {
@ -291,7 +298,7 @@ func (h *Handler) doActiveHealthCheck(dialInfo DialInfo, hostAddr string, upstre
zap.String("host", hostAddr),
zap.Error(err),
)
upstream.setHealthy(false)
markUnhealthy()
return nil
}
var body io.Reader = resp.Body
@ -311,7 +318,7 @@ func (h *Handler) doActiveHealthCheck(dialInfo DialInfo, hostAddr string, upstre
zap.Int("status_code", resp.StatusCode),
zap.String("host", hostAddr),
)
upstream.setHealthy(false)
markUnhealthy()
return nil
}
} else if resp.StatusCode < 200 || resp.StatusCode >= 400 {
@ -319,7 +326,7 @@ func (h *Handler) doActiveHealthCheck(dialInfo DialInfo, hostAddr string, upstre
zap.Int("status_code", resp.StatusCode),
zap.String("host", hostAddr),
)
upstream.setHealthy(false)
markUnhealthy()
return nil
}
@ -331,14 +338,14 @@ func (h *Handler) doActiveHealthCheck(dialInfo DialInfo, hostAddr string, upstre
zap.String("host", hostAddr),
zap.Error(err),
)
upstream.setHealthy(false)
markUnhealthy()
return nil
}
if !h.HealthChecks.Active.bodyRegexp.Match(bodyBytes) {
h.HealthChecks.Active.logger.Info("response body failed expectations",
zap.String("host", hostAddr),
)
upstream.setHealthy(false)
markUnhealthy()
return nil
}
}
@ -346,6 +353,7 @@ func (h *Handler) doActiveHealthCheck(dialInfo DialInfo, hostAddr string, upstre
// passed health check parameters, so mark as healthy
if upstream.setHealthy(true) {
h.HealthChecks.Active.logger.Info("host is up", zap.String("host", hostAddr))
h.events.Emit(h.ctx, "healthy", map[string]any{"host": hostAddr})
}
return nil

7
modules/caddyhttp/reverseproxy/reverseproxy.go
View File

@ -36,6 +36,7 @@ import (
"github.com/caddyserver/caddy/v2"
"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
"github.com/caddyserver/caddy/v2/modules/caddyevents"
"github.com/caddyserver/caddy/v2/modules/caddyhttp"
"github.com/caddyserver/caddy/v2/modules/caddyhttp/headers"
"github.com/caddyserver/caddy/v2/modules/caddyhttp/rewrite"
@ -193,6 +194,7 @@ type Handler struct {
ctx caddy.Context
logger *zap.Logger
events *caddyevents.App
}
// CaddyModule returns the Caddy module information.
@ -205,6 +207,11 @@ func (Handler) CaddyModule() caddy.ModuleInfo {
// Provision ensures that h is set up properly before use.
func (h *Handler) Provision(ctx caddy.Context) error {
eventAppIface, err := ctx.App("events")
if err != nil {
return fmt.Errorf("getting events app: %v", err)
}
h.events = eventAppIface.(*caddyevents.App)
h.ctx = ctx
h.logger = ctx.Logger(h)

3
modules/caddyhttp/server.go
View File

@ -30,6 +30,7 @@ import (
"time"
"github.com/caddyserver/caddy/v2"
"github.com/caddyserver/caddy/v2/modules/caddyevents"
"github.com/caddyserver/caddy/v2/modules/caddytls"
"github.com/caddyserver/certmagic"
"github.com/lucas-clemente/quic-go/http3"
@ -154,9 +155,11 @@ type Server struct {
listeners []net.Listener
tlsApp *caddytls.TLS
events *caddyevents.App
logger *zap.Logger
accessLogger *zap.Logger
errorLogger *zap.Logger
ctx caddy.Context
server *http.Server
h3server *http3.Server

1
modules/caddytls/automation.go
View File

@ -256,6 +256,7 @@ func (ap *AutomationPolicy) Provision(tlsApp *TLS) error {
MustStaple: ap.MustStaple,
RenewalWindowRatio: ap.RenewalWindowRatio,
KeySource: keySource,
OnEvent: tlsApp.onEvent,
OnDemand: ond,
OCSP: certmagic.OCSPConfig{
DisableStapling: ap.DisableOCSPStapling,

15
modules/caddytls/tls.go
View File

@ -15,6 +15,7 @@
package caddytls
import (
"context"
"crypto/tls"
"encoding/json"
"fmt"
@ -25,6 +26,7 @@ import (
"time"
"github.com/caddyserver/caddy/v2"
"github.com/caddyserver/caddy/v2/modules/caddyevents"
"github.com/caddyserver/certmagic"
"go.uber.org/zap"
)
@ -73,6 +75,7 @@ type TLS struct {
storageCleanTicker *time.Ticker
storageCleanStop chan struct{}
logger *zap.Logger
events *caddyevents.App
}
// CaddyModule returns the Caddy module information.
@ -85,6 +88,11 @@ func (TLS) CaddyModule() caddy.ModuleInfo {
// Provision sets up the configuration for the TLS app.
func (t *TLS) Provision(ctx caddy.Context) error {
eventsAppIface, err := ctx.App("events")
if err != nil {
return fmt.Errorf("getting events app: %v", err)
}
t.events = eventsAppIface.(*caddyevents.App)
t.ctx = ctx
t.logger = ctx.Logger(t)
repl := caddy.NewReplacer()
@ -189,6 +197,7 @@ func (t *TLS) Provision(ctx caddy.Context) error {
magic := certmagic.New(t.certCache, certmagic.Config{
Storage: ctx.Storage(),
Logger: t.logger,
OnEvent: t.onEvent,
OCSP: certmagic.OCSPConfig{
DisableStapling: t.DisableOCSPStapling,
},
@ -514,6 +523,12 @@ func (t *TLS) storageCleanInterval() time.Duration {
return defaultStorageCleanInterval
}
// onEvent translates CertMagic events into Caddy events then dispatches them.
func (t *TLS) onEvent(ctx context.Context, eventName string, data map[string]any) error {
evt := t.events.Emit(t.ctx, eventName, data)
return evt.Aborted
}
// CertificateLoader is a type that can load certificates.
// Certificates can optionally be associated with tags.
type CertificateLoader interface {

2
modules/standard/imports.go
View File

@ -3,6 +3,8 @@ package standard
import (
// standard Caddy modules
_ "github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
_ "github.com/caddyserver/caddy/v2/modules/caddyevents"
_ "github.com/caddyserver/caddy/v2/modules/caddyevents/eventsconfig"
_ "github.com/caddyserver/caddy/v2/modules/caddyhttp/standard"
_ "github.com/caddyserver/caddy/v2/modules/caddypki"
_ "github.com/caddyserver/caddy/v2/modules/caddypki/acmeserver"

20
usagepool.go
View File

@ -25,15 +25,15 @@ import (
// only inserted if they do not already exist. There
// are two ways to add values to the pool:
//
// 1) LoadOrStore will increment usage and store the
// value immediately if it does not already exist.
// 2) LoadOrNew will atomically check for existence
// and construct the value immediately if it does
// not already exist, or increment the usage
// otherwise, then store that value in the pool.
// When the constructed value is finally deleted
// from the pool (when its usage reaches 0), it
// will be cleaned up by calling Destruct().
// 1. LoadOrStore will increment usage and store the
// value immediately if it does not already exist.
// 2. LoadOrNew will atomically check for existence
// and construct the value immediately if it does
// not already exist, or increment the usage
// otherwise, then store that value in the pool.
// When the constructed value is finally deleted
// from the pool (when its usage reaches 0), it
// will be cleaned up by calling Destruct().
//
// The use of LoadOrNew allows values to be created
// and reused and finally cleaned up only once, even
@ -196,7 +196,7 @@ func (up *UsagePool) Delete(key any) (deleted bool, err error) {
// References returns the number of references (count of usages) to a
// key in the pool, and true if the key exists, or false otherwise.
func (up *UsagePool) References(key interface{}) (int, bool) {
func (up *UsagePool) References(key any) (int, bool) {
up.RLock()
upv, loaded := up.pool[key]
up.RUnlock()