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115 lines
3 KiB
Go
115 lines
3 KiB
Go
package transaction
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import (
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"encoding/json"
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"errors"
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"math"
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"strings"
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"github.com/nspcc-dev/neo-go/pkg/io"
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)
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//go:generate stringer -type=OracleResponseCode
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// OracleResponseCode represents result code of oracle response.
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type OracleResponseCode byte
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// OracleResponse represents oracle response.
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type OracleResponse struct {
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ID uint64 `json:"id"`
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Code OracleResponseCode `json:"code"`
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Result []byte `json:"result"`
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}
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// MaxOracleResultSize is the maximum allowed oracle answer size.
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const MaxOracleResultSize = math.MaxUint16
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// Enumeration of possible oracle response types.
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const (
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Success OracleResponseCode = 0x00
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ProtocolNotSupported OracleResponseCode = 0x10
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ConsensusUnreachable OracleResponseCode = 0x12
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NotFound OracleResponseCode = 0x14
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Timeout OracleResponseCode = 0x16
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Forbidden OracleResponseCode = 0x18
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ResponseTooLarge OracleResponseCode = 0x1a
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InsufficientFunds OracleResponseCode = 0x1c
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Error OracleResponseCode = 0xff
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)
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// Various validation errors.
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var (
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ErrInvalidResponseCode = errors.New("invalid oracle response code")
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ErrInvalidResult = errors.New("oracle response != success, but result is not empty")
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)
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// IsValid checks if c is valid response code.
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func (c OracleResponseCode) IsValid() bool {
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return c == Success || c == ProtocolNotSupported || c == ConsensusUnreachable || c == NotFound ||
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c == Timeout || c == Forbidden || c == ResponseTooLarge ||
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c == InsufficientFunds || c == Error
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}
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// MarshalJSON implements json.Marshaler interface.
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func (c OracleResponseCode) MarshalJSON() ([]byte, error) {
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return []byte(`"` + c.String() + `"`), nil
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}
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// UnmarshalJSON implements json.Unmarshaler interface.
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func (c *OracleResponseCode) UnmarshalJSON(data []byte) error {
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var js string
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if err := json.Unmarshal(data, &js); err != nil {
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return err
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}
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js = strings.ToLower(js)
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switch js {
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case "success":
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*c = Success
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case "protocolnotsupported":
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*c = ProtocolNotSupported
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case "consensusunreachable":
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*c = ConsensusUnreachable
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case "notfound":
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*c = NotFound
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case "timeout":
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*c = Timeout
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case "forbidden":
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*c = Forbidden
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case "responsetoolarge":
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*c = ResponseTooLarge
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case "insufficientfunds":
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*c = InsufficientFunds
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case "error":
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*c = Error
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default:
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return errors.New("invalid oracle response code")
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}
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return nil
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}
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// DecodeBinary implements io.Serializable interface.
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func (r *OracleResponse) DecodeBinary(br *io.BinReader) {
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r.ID = br.ReadU64LE()
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r.Code = OracleResponseCode(br.ReadB())
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if !r.Code.IsValid() {
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br.Err = ErrInvalidResponseCode
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return
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}
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r.Result = br.ReadVarBytes(MaxOracleResultSize)
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if r.Code != Success && len(r.Result) > 0 {
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br.Err = ErrInvalidResult
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}
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}
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// EncodeBinary implements io.Serializable interface.
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func (r *OracleResponse) EncodeBinary(w *io.BinWriter) {
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w.WriteU64LE(r.ID)
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w.WriteB(byte(r.Code))
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w.WriteVarBytes(r.Result)
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}
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func (r *OracleResponse) toJSONMap(m map[string]interface{}) {
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m["id"] = r.ID
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m["code"] = r.Code
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m["result"] = r.Result
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}
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