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event_record.go
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event_record.go
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// Go Substrate RPC Client (GSRPC) provides APIs and types around Polkadot and any Substrate-based chain RPC calls
//
// Copyright 2019 Centrifuge GmbH
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package types
import (
"bytes"
"errors"
"fmt"
"io"
"reflect"
"github.com/centrifuge/go-substrate-rpc-client/scale"
"github.com/ethereum/go-ethereum/log"
)
// EventRecordsRaw is a raw record for a set of events, represented as the raw bytes. It exists since
// decoding of events can only be done with metadata, so events can't follow the static way of decoding
// other types do. It exposes functions to decode events using metadata and targets.
// Be careful using this in your own structs – it only works as the last value in a struct since it will consume the
// remainder of the encoded data. The reason for this is that it does not contain any length encoding, so it would
// not know where to stop.
type EventRecordsRaw []byte
// Encode implements encoding for Data, which just unwraps the bytes of Data
func (e EventRecordsRaw) Encode(encoder scale.Encoder) error {
return encoder.Write(e)
}
// Decode implements decoding for Data, which just reads all the remaining bytes into Data
func (e *EventRecordsRaw) Decode(decoder scale.Decoder) error {
for i := 0; true; i++ {
b, err := decoder.ReadOneByte()
if err == io.EOF {
break
}
if err != nil {
return err
}
*e = append((*e)[:i], b)
}
return nil
}
// EventBalancesNewAccount is emitted when a new account was created
type EventBalancesNewAccount struct {
Phase Phase
AccountID AccountID
Balance U128
Topics []Hash
}
// EventBalancesReapedAccount is emitted when an account was reaped
type EventBalancesReapedAccount struct {
Phase Phase
AccountID AccountID
Topics []Hash
}
// EventBalancesTransfer is emitted when a transfer succeeded (from, to, value, fees)
type EventBalancesTransfer struct {
Phase Phase
From AccountID
To AccountID
Value U128
Fees U128
Topics []Hash
}
// EventGrandpaNewAuthorities is emitted when a new authority set has been applied
type EventGrandpaNewAuthorities struct {
Phase Phase
NewAuthorities []struct {
AuthorityID AuthorityID
AuthorityWeight U64
}
Topics []Hash
}
// EventGrandpaPaused is emitted when the current authority set has been paused
type EventGrandpaPaused struct {
Phase Phase
Topics []Hash
}
// EventGrandpaResumed is emitted when the current authority set has been resumed
type EventGrandpaResumed struct {
Phase Phase
Topics []Hash
}
// EventImOnlineAllGood is emitted when at the end of the session, no offence was committed
type EventImOnlineAllGood struct {
Phase Phase
Topics []Hash
}
// EventImOnlineHeartbeatReceived is emitted when a new heartbeat was received from AuthorityId
type EventImOnlineHeartbeatReceived struct {
Phase Phase
AuthorityID AuthorityID
Topics []Hash
}
// Exposure lists the own and nominated stake of a validator
type Exposure struct {
Total UCompact
Own UCompact
Others []IndividualExposure
}
// IndividualExposure contains the nominated stake by one specific third party
type IndividualExposure struct {
Who AccountID
Value UCompact
}
// EventImOnlineSomeOffline is emitted when the end of the session, at least once validator was found to be offline
type EventImOnlineSomeOffline struct {
Phase Phase
IdentificationTuples []struct {
ValidatorID AccountID
FullIdentification Exposure
}
Topics []Hash
}
// EventIndicesNewAccountIndex is emitted when a new account index was assigned. This event is not triggered
// when an existing index is reassigned to another AccountId
type EventIndicesNewAccountIndex struct {
Phase Phase
AccountID AccountID
AccountIndex AccountIndex
Topics []Hash
}
// EventOffencesOffence is emitted when there is an offence reported of the given kind happened at the session_index
// and (kind-specific) time slot. This event is not deposited for duplicate slashes
type EventOffencesOffence struct {
Phase Phase
Kind Bytes16
OpaqueTimeSlot Bytes
Topics []Hash
}
// EventSessionNewSession is emitted when a new session has happened. Note that the argument is the session index,
// not the block number as the type might suggest
type EventSessionNewSession struct {
Phase Phase
SessionIndex U32
Topics []Hash
}
// EventStakingOldSlashingReportDiscarded is emitted when an old slashing report from a prior era was discarded because
// it could not be processed
type EventStakingOldSlashingReportDiscarded struct {
Phase Phase
SessionIndex U32
Topics []Hash
}
// EventStakingReward is emitted when all validators have been rewarded by the first balance; the second is the
// remainder, from the maximum amount of reward.
type EventStakingReward struct {
Phase Phase
Balance U128
Remainder U128
Topics []Hash
}
// EventStakingSlash is emitted when one validator (and its nominators) has been slashed by the given amount
type EventStakingSlash struct {
Phase Phase
AccountID AccountID
Balance U128
Topics []Hash
}
// EventSystemExtrinsicSuccessV8 is emitted when an extrinsic completed successfully
//
// Deprecated: EventSystemExtrinsicSuccessV8 exists to allow users to simply implement their own EventRecords struct if
// they are on metadata version 8 or below. Use EventSystemExtrinsicSuccess otherwise
type EventSystemExtrinsicSuccessV8 struct {
Phase Phase
Topics []Hash
}
// EventSystemExtrinsicSuccess is emitted when an extrinsic completed successfully
type EventSystemExtrinsicSuccess struct {
Phase Phase
DispatchInfo DispatchInfo
Topics []Hash
}
// DispatchInfo contains a bundle of static information collected from the `#[weight = $x]` attributes.
type DispatchInfo struct {
// Weight of this transaction
Weight U32
// Class of this transaction
Class DispatchClass
/// PaysFee indicates whether this transaction pays fees
PaysFee bool
}
// DispatchClass is a generalized group of dispatch types. This is only distinguishing normal, user-triggered
// transactions (`Normal`) and anything beyond which serves a higher purpose to the system (`Operational`).
type DispatchClass struct {
// A normal dispatch
IsNormal bool
// An operational dispatch
IsOperational bool
}
func (d *DispatchClass) Decode(decoder scale.Decoder) error {
b, err := decoder.ReadOneByte()
if b == 0 {
d.IsNormal = true
} else if b == 1 {
d.IsOperational = true
}
return err
}
func (d DispatchClass) Encode(encoder scale.Encoder) error {
var err error
if d.IsNormal {
err = encoder.PushByte(0)
} else if d.IsOperational {
err = encoder.PushByte(1)
}
return err
}
// EventSystemExtrinsicFailedV8 is emitted when an extrinsic failed
//
// Deprecated: EventSystemExtrinsicFailedV8 exists to allow users to simply implement their own EventRecords struct if
// they are on metadata version 8 or below. Use EventSystemExtrinsicFailed otherwise
type EventSystemExtrinsicFailedV8 struct {
Phase Phase
DispatchError DispatchError
Topics []Hash
}
// EventSystemExtrinsicFailed is emitted when an extrinsic failed
type EventSystemExtrinsicFailed struct {
Phase Phase
DispatchError DispatchError
DispatchInfo DispatchInfo
Topics []Hash
}
// EventTreasuryDeposit is emitted when some funds have been deposited
type EventTreasuryDeposit struct {
Phase Phase
Balance U128
Topics []Hash
}
// EventRecords is a default set of possible event records that can be used as a target for
// `func (e EventRecordsRaw) Decode(...`
type EventRecords struct {
Balances_NewAccount []EventBalancesNewAccount //nolint:stylecheck,golint
Balances_ReapedAccount []EventBalancesReapedAccount //nolint:stylecheck,golint
Balances_Transfer []EventBalancesTransfer //nolint:stylecheck,golint
Grandpa_NewAuthorities []EventGrandpaNewAuthorities //nolint:stylecheck,golint
Grandpa_Paused []EventGrandpaPaused //nolint:stylecheck,golint
Grandpa_Resumed []EventGrandpaResumed //nolint:stylecheck,golint
ImOnline_AllGood []EventImOnlineAllGood //nolint:stylecheck,golint
ImOnline_HeartbeatReceived []EventImOnlineHeartbeatReceived //nolint:stylecheck,golint
ImOnline_SomeOffline []EventImOnlineSomeOffline //nolint:stylecheck,golint
Indices_NewAccountIndex []EventIndicesNewAccountIndex //nolint:stylecheck,golint
Offences_Offence []EventOffencesOffence //nolint:stylecheck,golint
Session_NewSession []EventSessionNewSession //nolint:stylecheck,golint
Staking_OldSlashingReportDiscarded []EventStakingOldSlashingReportDiscarded //nolint:stylecheck,golint
Staking_Reward []EventStakingReward //nolint:stylecheck,golint
Staking_Slash []EventStakingSlash //nolint:stylecheck,golint
System_ExtrinsicSuccess []EventSystemExtrinsicSuccess //nolint:stylecheck,golint
System_ExtrinsicFailed []EventSystemExtrinsicFailed //nolint:stylecheck,golint
Treasury_Deposit []EventTreasuryDeposit //nolint:stylecheck,golint
}
// DecodeEventRecords decodes the events records from an EventRecordRaw into a target t using the given Metadata m
func (e EventRecordsRaw) DecodeEventRecords(m *Metadata, t interface{}) error {
log.Debug(fmt.Sprintf("will decode event records from raw hex: %#x", e))
// ensure t is a pointer
ttyp := reflect.TypeOf(t)
if ttyp.Kind() != reflect.Ptr {
return errors.New("target must be a pointer, but is " + fmt.Sprint(ttyp))
}
// ensure t is not a nil pointer
tval := reflect.ValueOf(t)
if tval.IsNil() {
return errors.New("target is a nil pointer")
}
val := tval.Elem()
typ := val.Type()
// ensure val can be set
if !val.CanSet() {
return fmt.Errorf("unsettable value %v", typ)
}
// ensure val points to a struct
if val.Kind() != reflect.Struct {
return fmt.Errorf("target must point to a struct, but is " + fmt.Sprint(typ))
}
decoder := scale.NewDecoder(bytes.NewReader(e))
// determine number of events
n, err := decoder.DecodeUintCompact()
if err != nil {
return err
}
log.Debug(fmt.Sprintf("found %v events", n))
// iterate over events
for i := uint64(0); i < n; i++ {
log.Debug(fmt.Sprintf("decoding event #%v", i))
// decode Phase
phase := Phase{}
err := decoder.Decode(&phase)
if err != nil {
return fmt.Errorf("unable to decode Phase for event #%v: %v", i, err)
}
// decode EventID
id := EventID{}
err = decoder.Decode(&id)
if err != nil {
return fmt.Errorf("unable to decode EventID for event #%v: %v", i, err)
}
log.Debug(fmt.Sprintf("event #%v has EventID %v", i, id))
// ask metadata for method & event name for event
moduleName, eventName, err := m.FindEventNamesForEventID(id)
// moduleName, eventName, err := "System", "ExtrinsicSuccess", nil
if err != nil {
return fmt.Errorf("unable to find event with EventID %v in metadata for event #%v", id, i)
}
log.Debug(fmt.Sprintf("event #%v is in module %v with event name %v", i, moduleName, eventName))
// check whether name for eventID exists in t
field := val.FieldByName(fmt.Sprintf("%v_%v", moduleName, eventName))
if !field.IsValid() {
return fmt.Errorf("unable to find field %v_%v for event #%v with EventID %v", moduleName, eventName, i, id)
}
// create a pointer to with the correct type that will hold the decoded event
holder := reflect.New(field.Type().Elem())
// ensure first field is for Phase, last field is for Topics
numFields := holder.Elem().NumField()
if numFields < 2 {
return fmt.Errorf("expected event #%v with EventID %v, field %v_%v to have at least 2 fields "+
"(for Phase and Topics), but has %v fields", i, id, moduleName, eventName, numFields)
}
phaseField := holder.Elem().FieldByIndex([]int{0})
if phaseField.Type() != reflect.TypeOf(phase) {
return fmt.Errorf("expected the first field of event #%v with EventID %v, field %v_%v to be of type "+
"types.Phase, but got %v", i, id, moduleName, eventName, phaseField.Type())
}
topicsField := holder.Elem().FieldByIndex([]int{numFields - 1})
if topicsField.Type() != reflect.TypeOf([]Hash{}) {
return fmt.Errorf("expected the last field of event #%v with EventID %v, field %v_%v to be of type "+
"[]types.Hash for Topics, but got %v", i, id, moduleName, eventName, topicsField.Type())
}
// set the phase we decoded earlier
phaseField.Set(reflect.ValueOf(phase))
// set the remaining fields
for j := 1; j < numFields; j++ {
err = decoder.Decode(holder.Elem().FieldByIndex([]int{j}).Addr().Interface())
if err != nil {
return fmt.Errorf("unable to decode field %v event #%v with EventID %v, field %v_%v: %v", j, i, id, moduleName,
eventName, err)
}
}
// add the decoded event to the slice
field.Set(reflect.Append(field, holder.Elem()))
log.Debug(fmt.Sprintf("decoded event #%v", i))
}
return nil
}
// Phase is an enum describing the current phase of the event (applying the extrinsic or finalized)
type Phase struct {
IsApplyExtrinsic bool
AsApplyExtrinsic uint32
IsFinalization bool
}
func (p *Phase) Decode(decoder scale.Decoder) error {
b, err := decoder.ReadOneByte()
if err != nil {
return err
}
if b == 0 {
p.IsApplyExtrinsic = true
err = decoder.Decode(&p.AsApplyExtrinsic)
} else if b == 1 {
p.IsFinalization = true
}
if err != nil {
return err
}
return nil
}
func (p Phase) Encode(encoder scale.Encoder) error {
var err1, err2 error
if p.IsApplyExtrinsic {
err1 = encoder.PushByte(0)
err2 = encoder.Encode(p.AsApplyExtrinsic)
} else if p.IsFinalization {
err1 = encoder.PushByte(1)
}
if err1 != nil {
return err1
}
if err2 != nil {
return err2
}
return nil
}
// DispatchError is an error occurring during extrinsic dispatch
type DispatchError struct {
HasModule bool
Module uint8
Error uint8
}
func (d *DispatchError) Decode(decoder scale.Decoder) error {
b, err := decoder.ReadOneByte()
if err != nil {
return err
}
if b == 1 {
d.HasModule = true
err = decoder.Decode(&d.Module)
}
if err != nil {
return err
}
return decoder.Decode(&d.Error)
}
func (d DispatchError) Encode(encoder scale.Encoder) error {
var err error
if d.HasModule {
err = encoder.PushByte(1)
if err != nil {
return err
}
err = encoder.Encode(d.Module)
} else {
err = encoder.PushByte(0)
}
if err != nil {
return err
}
return encoder.Encode(&d.Error)
}
type EventID [2]byte