added DB api

rpc/api/db.go

@@ -0,0 +1,128 @@
+package api
+
+import (
+	"github.com/ethereum/go-ethereum/eth"
+	"github.com/ethereum/go-ethereum/rpc/codec"
+	"github.com/ethereum/go-ethereum/rpc/shared"
+	"github.com/ethereum/go-ethereum/xeth"
+)
+
+const (
+	DbApiversion = "1.0"
+)
+
+var (
+	// mapping between methods and handlers
+	DbMapping = map[string]dbhandler{
+		"db_getString": (*dbApi).GetString,
+		"db_putString": (*dbApi).PutString,
+		"db_getHex":    (*dbApi).GetHex,
+		"db_putHex":    (*dbApi).PutHex,
+	}
+)
+
+// db callback handler
+type dbhandler func(*dbApi, *shared.Request) (interface{}, error)
+
+// db api provider
+type dbApi struct {
+	xeth     *xeth.XEth
+	ethereum *eth.Ethereum
+	methods  map[string]dbhandler
+	codec    codec.ApiCoder
+}
+
+// create a new db api instance
+func NewDbApi(xeth *xeth.XEth, ethereum *eth.Ethereum, coder codec.Codec) *dbApi {
+	return &dbApi{
+		xeth:     xeth,
+		ethereum: ethereum,
+		methods:  DbMapping,
+		codec:    coder.New(nil),
+	}
+}
+
+// collection with supported methods
+func (self *dbApi) Methods() []string {
+	methods := make([]string, len(self.methods))
+	i := 0
+	for k := range self.methods {
+		methods[i] = k
+		i++
+	}
+	return methods
+}
+
+// Execute given request
+func (self *dbApi) Execute(req *shared.Request) (interface{}, error) {
+	if callback, ok := self.methods[req.Method]; ok {
+		return callback(self, req)
+	}
+
+	return nil, &shared.NotImplementedError{req.Method}
+}
+
+func (self *dbApi) Name() string {
+	return DbApiName
+}
+
+func (self *dbApi) ApiVersion() string {
+	return DbApiversion
+}
+
+func (self *dbApi) GetString(req *shared.Request) (interface{}, error) {
+	args := new(DbArgs)
+	if err := self.codec.Decode(req.Params, &args); err != nil {
+		return nil, shared.NewDecodeParamError(err.Error())
+	}
+
+	if err := args.requirements(); err != nil {
+		return nil, err
+	}
+
+	ret, err := self.xeth.DbGet([]byte(args.Database + args.Key))
+	return string(ret), err
+}
+
+func (self *dbApi) PutString(req *shared.Request) (interface{}, error) {
+	args := new(DbArgs)
+	if err := self.codec.Decode(req.Params, &args); err != nil {
+		return nil, shared.NewDecodeParamError(err.Error())
+	}
+
+	if err := args.requirements(); err != nil {
+		return nil, err
+	}
+
+	return self.xeth.DbPut([]byte(args.Database+args.Key), args.Value), nil
+}
+
+func (self *dbApi) GetHex(req *shared.Request) (interface{}, error) {
+	args := new(DbHexArgs)
+	if err := self.codec.Decode(req.Params, &args); err != nil {
+		return nil, shared.NewDecodeParamError(err.Error())
+	}
+
+	if err := args.requirements(); err != nil {
+		return nil, err
+	}
+
+	if res, err := self.xeth.DbGet([]byte(args.Database + args.Key)); err == nil {
+		return newHexData(res), nil
+	} else {
+		return nil, err
+	}
+}
+
+func (self *dbApi) PutHex(req *shared.Request) (interface{}, error) {
+	args := new(DbHexArgs)
+	if err := self.codec.Decode(req.Params, &args); err != nil {
+		return nil, shared.NewDecodeParamError(err.Error())
+	}
+
+	if err := args.requirements(); err != nil {
+		return nil, err
+	}
+
+	return self.xeth.DbPut([]byte(args.Database+args.Key), args.Value), nil
+}