160 lines
3.2 KiB
Go
160 lines
3.2 KiB
Go
package rpc
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import (
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"bytes"
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"encoding/hex"
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"encoding/json"
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"fmt"
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"github.com/CityOfZion/neo-go/pkg/encoding/address"
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"github.com/CityOfZion/neo-go/pkg/util"
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"github.com/pkg/errors"
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)
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type (
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// Param represents a param either passed to
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// the server or to send to a server using
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// the client.
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Param struct {
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Type paramType
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Value interface{}
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}
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paramType int
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// FuncParam represents a function argument parameter used in the
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// invokefunction RPC method.
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FuncParam struct {
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Type StackParamType `json:"type"`
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Value Param `json:"value"`
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}
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)
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const (
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defaultT paramType = iota
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stringT
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numberT
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arrayT
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funcParamT
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)
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func (p Param) String() string {
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return fmt.Sprintf("%v", p.Value)
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}
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// GetString returns string value of the parameter.
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func (p Param) GetString() (string, error) {
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str, ok := p.Value.(string)
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if !ok {
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return "", errors.New("not a string")
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}
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return str, nil
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}
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// GetInt returns int value of te parameter.
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func (p Param) GetInt() (int, error) {
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i, ok := p.Value.(int)
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if !ok {
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return 0, errors.New("not an integer")
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}
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return i, nil
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}
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// GetArray returns a slice of Params stored in the parameter.
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func (p Param) GetArray() ([]Param, error) {
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a, ok := p.Value.([]Param)
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if !ok {
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return nil, errors.New("not an array")
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}
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return a, nil
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}
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// GetUint256 returns Uint256 value of the parameter.
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func (p Param) GetUint256() (util.Uint256, error) {
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s, err := p.GetString()
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if err != nil {
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return util.Uint256{}, err
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}
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return util.Uint256DecodeStringLE(s)
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}
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// GetUint160FromHex returns Uint160 value of the parameter encoded in hex.
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func (p Param) GetUint160FromHex() (util.Uint160, error) {
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s, err := p.GetString()
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if err != nil {
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return util.Uint160{}, err
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}
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return util.Uint160DecodeStringLE(s)
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}
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// GetUint160FromAddress returns Uint160 value of the parameter that was
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// supplied as an address.
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func (p Param) GetUint160FromAddress() (util.Uint160, error) {
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s, err := p.GetString()
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if err != nil {
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return util.Uint160{}, err
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}
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return address.DecodeUint160(s)
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}
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// GetFuncParam returns current parameter as a function call parameter.
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func (p Param) GetFuncParam() (FuncParam, error) {
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fp, ok := p.Value.(FuncParam)
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if !ok {
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return FuncParam{}, errors.New("not a function parameter")
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}
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return fp, nil
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}
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// GetBytesHex returns []byte value of the parameter if
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// it is a hex-encoded string.
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func (p Param) GetBytesHex() ([]byte, error) {
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s, err := p.GetString()
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if err != nil {
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return nil, err
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}
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return hex.DecodeString(s)
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}
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// UnmarshalJSON implements json.Unmarshaler interface.
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func (p *Param) UnmarshalJSON(data []byte) error {
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var s string
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if err := json.Unmarshal(data, &s); err == nil {
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p.Type = stringT
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p.Value = s
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return nil
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}
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var num float64
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if err := json.Unmarshal(data, &num); err == nil {
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p.Type = numberT
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p.Value = int(num)
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return nil
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}
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r := bytes.NewReader(data)
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jd := json.NewDecoder(r)
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jd.DisallowUnknownFields()
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var fp FuncParam
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if err := jd.Decode(&fp); err == nil {
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p.Type = funcParamT
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p.Value = fp
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return nil
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}
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var ps []Param
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if err := json.Unmarshal(data, &ps); err == nil {
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p.Type = arrayT
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p.Value = ps
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return nil
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}
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return errors.New("unknown type")
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}
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