/
builtin.go
147 lines (124 loc) · 3.2 KB
/
builtin.go
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package run
import (
"context"
"errors"
"fmt"
"net/http"
"github.com/go-chi/chi"
"github.com/heedy/heedy/backend/database"
)
type BuiltinHelper interface {
GetHandler(uri string) (http.Handler, error)
}
type builtinHelper struct {
plugin string
m *Manager
}
func (bh *builtinHelper) GetHandler(uri string) (http.Handler, error) {
return bh.m.GetHandler(bh.plugin, uri)
}
type BuiltinStartFunc func(db *database.AdminDB, i *Info, h BuiltinHelper) error
// Builtin is passed in to the BuiltinHandler with
type BuiltinRunner struct {
Key string
Start BuiltinStartFunc
Stop func(db *database.AdminDB, apikey string) error
Handler http.Handler
}
func WithVersion(pluginName string, dbversion int, pstart func(*database.AdminDB, *Info, BuiltinHelper, int) error) BuiltinStartFunc {
return func(db *database.AdminDB, i *Info, h BuiltinHelper) error {
curVersion, err := db.ReadPluginDatabaseVersion(pluginName)
if err != nil {
return err
}
err = pstart(db, i, h, curVersion)
if err != nil {
return err
}
if dbversion != curVersion {
err = db.WritePluginDatabaseVersion(pluginName, dbversion)
}
return err
}
}
// WithNilInfo can be used to convert a plugin start func that doesn't require an Info struct
// into a function compatible with database.AddCreateHook.
func WithNilInfo(bis BuiltinStartFunc) func(*database.AdminDB) error {
return func(db *database.AdminDB) error {
return bis(db, nil, nil)
}
}
type builtinRunnerMap map[string]*BuiltinRunner
type ChiClearer struct {
Handler http.Handler
}
func (cc ChiClearer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
cc.Handler.ServeHTTP(w, r.WithContext(context.WithValue(r.Context(), chi.RouteCtxKey, nil)))
}
func (b builtinRunnerMap) Add(r *BuiltinRunner) {
if r.Handler != nil {
r.Handler = ChiClearer{r.Handler}
}
b[r.Key] = r
}
var Builtin = make(builtinRunnerMap)
type BuiltinHandler struct {
DB *database.AdminDB
Running map[string]string
m *Manager
}
func NewBuiltinHandler(db *database.AdminDB, m *Manager) *BuiltinHandler {
return &BuiltinHandler{
DB: db,
Running: make(map[string]string),
m: m,
}
}
func (bh *BuiltinHandler) Start(i *Info) (h http.Handler, err error) {
err = bh.Run(i)
if err == nil {
// This was validated in Run
bkey := i.Run.Config["key"].(string)
r := Builtin[bkey]
h = r.Handler
bh.Running[i.APIKey] = bkey
}
return
}
func (bh *BuiltinHandler) Stop(apikey string) error {
bkey, ok := bh.Running[apikey]
if !ok {
return errors.New("The server is not running")
}
delete(bh.Running, apikey)
r := Builtin[bkey]
if r.Stop == nil {
return nil
}
return r.Stop(bh.DB, apikey)
}
func (bg *BuiltinHandler) Kill(apikey string) error {
// Builtin stuff can't actually be killed
return nil
}
func (bh *BuiltinHandler) Run(i *Info) (err error) {
k, ok := i.Run.Config["key"]
if !ok {
err = errors.New("builtin runtype requires a 'key' attribute")
return
}
bkey, ok := k.(string)
if !ok {
err = errors.New("'key' must be a string")
return
}
r, ok := Builtin[bkey]
if !ok {
err = fmt.Errorf("builtin key '%s' not recognized", bkey)
return
}
if r.Start != nil {
err = r.Start(bh.DB, i, &builtinHelper{i.Name, bh.m})
}
return
}