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topics.go
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topics.go
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package abi
import (
"bytes"
"fmt"
"reflect"
"github.com/umbracle/ethgo"
)
// ParseLog parses an event log
func ParseLog(args *Type, log *ethgo.Log) (map[string]interface{}, error) {
var indexed, nonIndexed []*TupleElem
for _, arg := range args.TupleElems() {
if arg.Indexed {
indexed = append(indexed, arg)
} else {
nonIndexed = append(nonIndexed, arg)
}
}
// decode indexed fields
indexedObjs, err := ParseTopics(&Type{kind: KindTuple, tuple: indexed}, log.Topics[1:])
if err != nil {
return nil, err
}
var nonIndexedObjs map[string]interface{}
if len(nonIndexed) > 0 {
nonIndexedRaw, err := Decode(&Type{kind: KindTuple, tuple: nonIndexed}, log.Data)
if err != nil {
return nil, err
}
raw, ok := nonIndexedRaw.(map[string]interface{})
if !ok {
return nil, fmt.Errorf("bad decoding")
}
nonIndexedObjs = raw
}
res := map[string]interface{}{}
for _, arg := range args.TupleElems() {
if arg.Indexed {
res[arg.Name] = indexedObjs[0]
indexedObjs = indexedObjs[1:]
} else {
res[arg.Name] = nonIndexedObjs[arg.Name]
}
}
return res, nil
}
// ParseTopics parses topics from a log event
func ParseTopics(args *Type, topics []ethgo.Hash) ([]interface{}, error) {
if args.kind != KindTuple {
return nil, fmt.Errorf("expected a tuple type")
}
if len(args.TupleElems()) != len(topics) {
return nil, fmt.Errorf("bad length")
}
elems := []interface{}{}
for indx, arg := range args.TupleElems() {
elem, err := ParseTopic(arg.Elem, topics[indx])
if err != nil {
return nil, err
}
elems = append(elems, elem)
}
return elems, nil
}
// ParseTopic parses an individual topic
func ParseTopic(t *Type, topic ethgo.Hash) (interface{}, error) {
switch t.kind {
case KindBool:
if bytes.Equal(topic[:], topicTrue[:]) {
return true, nil
} else if bytes.Equal(topic[:], topicFalse[:]) {
return false, nil
}
return true, fmt.Errorf("is not a boolean")
case KindInt, KindUInt:
return readInteger(t, topic[:]), nil
case KindAddress:
return readAddr(topic[:])
case KindFixedBytes:
return readFixedBytes(t, topic[:])
default:
return nil, fmt.Errorf("topic parsing for type %s not supported", t.String())
}
}
// EncodeTopic encodes a topic
func EncodeTopic(t *Type, val interface{}) (ethgo.Hash, error) {
return encodeTopic(t, reflect.ValueOf(val))
}
func encodeTopic(t *Type, val reflect.Value) (ethgo.Hash, error) {
switch t.kind {
case KindBool:
return encodeTopicBool(val)
case KindUInt, KindInt:
return encodeTopicNum(t, val)
case KindAddress:
return encodeTopicAddress(val)
}
return ethgo.Hash{}, fmt.Errorf("not found")
}
var topicTrue, topicFalse ethgo.Hash
func init() {
topicTrue[31] = 1
}
func encodeTopicAddress(val reflect.Value) (res ethgo.Hash, err error) {
var b []byte
b, err = encodeAddress(val)
if err != nil {
return
}
copy(res[:], b[:])
return
}
func encodeTopicNum(t *Type, val reflect.Value) (res ethgo.Hash, err error) {
var b []byte
b, err = encodeNum(val)
if err != nil {
return
}
copy(res[:], b[:])
return
}
func encodeTopicBool(v reflect.Value) (res ethgo.Hash, err error) {
if v.Kind() != reflect.Bool {
return ethgo.Hash{}, encodeErr(v, "bool")
}
if v.Bool() {
return topicTrue, nil
}
return topicFalse, nil
}