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|
package caddy2
import (
"context"
"encoding/json"
"fmt"
"log"
"strings"
"sync"
"time"
"github.com/mholt/certmagic"
)
// Run runs Caddy with the given config.
func Run(newCfg *Config) error {
currentCfgMu.Lock()
defer currentCfgMu.Unlock()
if newCfg != nil {
// because we will need to roll back any state
// modifications if this function errors, we
// keep a single error value and scope all
// sub-operations to their own functions to
// ensure this error value does not get
// overridden or missed when it should have
// been set by a short assignment
var err error
// prepare the new config for use
newCfg.apps = make(map[string]App)
// create a context within which to load
// modules - essentially our new config's
// execution environment; be sure that
// cleanup occurs when we return if there
// was an error; if no error, it will get
// cleaned up on next config cycle
ctx, cancel := NewContext(Context{Context: context.Background(), cfg: newCfg})
defer func() {
if err != nil {
cancel() // clean up now
}
}()
newCfg.cancelFunc = cancel // clean up later
// set up storage and make it CertMagic's default storage, too
err = func() error {
if newCfg.StorageRaw != nil {
val, err := ctx.LoadModuleInline("system", "caddy.storage", newCfg.StorageRaw)
if err != nil {
return fmt.Errorf("loading storage module: %v", err)
}
stor, err := val.(StorageConverter).CertMagicStorage()
if err != nil {
return fmt.Errorf("creating storage value: %v", err)
}
newCfg.storage = stor
newCfg.StorageRaw = nil // allow GC to deallocate - TODO: Does this help?
}
if newCfg.storage == nil {
newCfg.storage = &certmagic.FileStorage{Path: dataDir()}
}
certmagic.Default.Storage = newCfg.storage
return nil
}()
if err != nil {
return err
}
// Load, Provision, Validate
err = func() error {
for modName, rawMsg := range newCfg.AppsRaw {
val, err := ctx.LoadModule(modName, rawMsg)
if err != nil {
return fmt.Errorf("loading app module '%s': %v", modName, err)
}
newCfg.apps[modName] = val.(App)
}
return nil
}()
if err != nil {
return err
}
// Start
err = func() error {
var started []string
for name, a := range newCfg.apps {
err := a.Start()
if err != nil {
for _, otherAppName := range started {
err2 := newCfg.apps[otherAppName].Stop()
if err2 != nil {
err = fmt.Errorf("%v; additionally, aborting app %s: %v",
err, otherAppName, err2)
}
}
return fmt.Errorf("%s app module: start: %v", name, err)
}
started = append(started, name)
}
return nil
}()
if err != nil {
return err
}
}
// swap old config with the new one
oldCfg := currentCfg
currentCfg = newCfg
// Stop, Cleanup
if oldCfg != nil {
for name, a := range oldCfg.apps {
err := a.Stop()
if err != nil {
log.Printf("[ERROR] stop %s: %v", name, err)
}
}
// clean up old modules
oldCfg.cancelFunc()
}
return nil
}
// App is a thing that Caddy runs.
type App interface {
Start() error
Stop() error
}
// Config represents a Caddy configuration.
type Config struct {
StorageRaw json.RawMessage `json:"storage,omitempty"`
storage certmagic.Storage
AppsRaw map[string]json.RawMessage `json:"apps,omitempty"`
// apps stores the decoded Apps values,
// keyed by module name.
apps map[string]App
cancelFunc context.CancelFunc
}
// Duration is a JSON-string-unmarshable duration type.
type Duration time.Duration
// UnmarshalJSON satisfies json.Unmarshaler.
func (d *Duration) UnmarshalJSON(b []byte) error {
dd, err := time.ParseDuration(strings.Trim(string(b), `"`))
if err != nil {
return err
}
cd := Duration(dd)
d = &cd
return nil
}
// CtxKey is a value type for use with context.WithValue.
type CtxKey string
// currentCfg is the currently-loaded configuration.
var (
currentCfg *Config
currentCfgMu sync.RWMutex
)
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