/
rpc.go
175 lines (151 loc) · 3.63 KB
/
rpc.go
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package server
import (
"log"
"reflect"
"strings"
"sync"
"time"
)
type rpcHandler struct {
constructor func() interface{}
configType reflect.Type
version string // version number
priority int // priority info
lock sync.RWMutex
instances map[int]*instanceData
events map[int]*eventData
lastCloseInstance time.Time
}
var methodNames = [...]string{
"Certificate",
"Rewrite",
"Access",
"Response",
"Preread",
"Log",
}
func getHandlerNames(t reflect.Type) []string {
handlers := []string{}
for _, name := range methodNames {
_, hasIt := t.MethodByName(name)
if hasIt {
handlers = append(handlers, strings.ToLower(name))
}
}
return handlers
}
func newRpcHandler(constructor func() interface{}, version string, priority int) *rpcHandler {
constructorType := reflect.TypeOf(constructor)
if constructorType == nil {
log.Printf("nil constructor")
return nil
}
if constructorType.Kind() != reflect.Func {
log.Printf("Constructor is not a function")
return nil
}
if constructorType.NumIn() != 0 || constructorType.NumOut() != 1 {
log.Printf("Wrong constructor signature")
return nil
}
return &rpcHandler{
constructor: constructor,
configType: reflect.TypeOf(constructor()),
version: version,
priority: priority,
instances: map[int]*instanceData{},
events: map[int]*eventData{},
}
}
type schemaDict map[string]interface{}
func getSchemaDict(t reflect.Type) schemaDict {
switch t.Kind() {
case reflect.String:
return schemaDict{"type": "string"}
case reflect.Bool:
return schemaDict{"type": "boolean"}
case reflect.Int, reflect.Int32:
return schemaDict{"type": "integer"}
case reflect.Uint, reflect.Uint32:
return schemaDict{
"type": "integer",
"between": []int{0, 2147483648},
}
case reflect.Float32, reflect.Float64:
return schemaDict{"type": "number"}
case reflect.Ptr:
return getSchemaDict(t.Elem())
case reflect.Slice:
elemType := getSchemaDict(t.Elem())
if elemType == nil {
break
}
return schemaDict{
"type": "array",
"elements": elemType,
}
case reflect.Map:
kType := getSchemaDict(t.Key())
vType := getSchemaDict(t.Elem())
if kType == nil || vType == nil {
break
}
return schemaDict{
"type": "map",
"keys": kType,
"values": vType,
}
case reflect.Struct:
fieldsArray := []schemaDict{}
for i := 0; i < t.NumField(); i++ {
field := t.Field(i)
// ignore unexported fields
if len(field.PkgPath) != 0 {
continue
}
typeDecl := getSchemaDict(field.Type)
if typeDecl == nil {
// ignore unrepresentable types
continue
}
name := field.Tag.Get("json")
if name == "" {
name = strings.ToLower(field.Name)
}
fieldsArray = append(fieldsArray, schemaDict{name: typeDecl})
}
return schemaDict{
"type": "record",
"fields": fieldsArray,
}
}
return nil
}
type pluginInfo struct {
Name string // plugin name
ModTime time.Time `codec:",omitempty"` // plugin file modification time
LoadTime time.Time `codec:",omitempty"` // plugin load time
Phases []string // events it can handle
Version string // version number
Priority int // priority info
Schema schemaDict // representation of the config schema
}
func (rh *rpcHandler) getInfo() (info pluginInfo, err error) {
name, err := getName()
if err != nil {
return
}
info = pluginInfo{
Name: name,
Phases: getHandlerNames(rh.configType),
Schema: schemaDict{
"name": name,
"fields": []schemaDict{
{"config": getSchemaDict(rh.configType)},
},
},
Version: rh.version,
Priority: rh.priority,
}
return
}