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accounts/abi: generic unpacking of event logs into map[string]interface{} (#18440)

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Add methods that allow for the unpacking of event logs into maps (allows for agnostic unpacking of logs)
This commit is contained in:
Ian Norden
2019-04-01 08:42:59 -05:00
committed by Guillaume Ballet
parent 86e77900c5
commit cd79bc61a9
7 changed files with 596 additions and 10 deletions
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34
accounts/abi/abi.go
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@ -72,19 +72,39 @@ func (abi ABI) Pack(name string, args ...interface{}) ([]byte, error) {
}
// Unpack output in v according to the abi specification
func (abi ABI) Unpack(v interface{}, name string, output []byte) (err error) {
if len(output) == 0 {
func (abi ABI) Unpack(v interface{}, name string, data []byte) (err error) {
if len(data) == 0 {
return fmt.Errorf("abi: unmarshalling empty output")
}
// since there can't be naming collisions with contracts and events,
// we need to decide whether we're calling a method or an event
if method, ok := abi.Methods[name]; ok {
if len(output)%32 != 0 {
return fmt.Errorf("abi: improperly formatted output: %s - Bytes: [%+v]", string(output), output)
if len(data)%32 != 0 {
return fmt.Errorf("abi: improperly formatted output: %s - Bytes: [%+v]", string(data), data)
}
return method.Outputs.Unpack(v, output)
} else if event, ok := abi.Events[name]; ok {
return event.Inputs.Unpack(v, output)
return method.Outputs.Unpack(v, data)
}
if event, ok := abi.Events[name]; ok {
return event.Inputs.Unpack(v, data)
}
return fmt.Errorf("abi: could not locate named method or event")
}
// UnpackIntoMap unpacks a log into the provided map[string]interface{}
func (abi ABI) UnpackIntoMap(v map[string]interface{}, name string, data []byte) (err error) {
if len(data) == 0 {
return fmt.Errorf("abi: unmarshalling empty output")
}
// since there can't be naming collisions with contracts and events,
// we need to decide whether we're calling a method or an event
if method, ok := abi.Methods[name]; ok {
if len(data)%32 != 0 {
return fmt.Errorf("abi: improperly formatted output")
}
return method.Outputs.UnpackIntoMap(v, data)
}
if event, ok := abi.Events[name]; ok {
return event.Inputs.UnpackIntoMap(v, data)
}
return fmt.Errorf("abi: could not locate named method or event")
}