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snapshot.go
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snapshot.go
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// Copyright (c) 2022 Gobalsky Labs Limited
//
// Use of this software is governed by the Business Source License included
// in the LICENSE.VEGA file and at https://www.mariadb.com/bsl11.
//
// Change Date: 18 months from the later of the date of the first publicly
// available Distribution of this version of the repository, and 25 June 2022.
//
// On the date above, in accordance with the Business Source License, use
// of this software will be governed by version 3 or later of the GNU General
// Public License.
package spot
import (
"context"
"time"
"code.vegaprotocol.io/vega/core/types"
"code.vegaprotocol.io/vega/libs/num"
"code.vegaprotocol.io/vega/libs/proto"
snapshot "code.vegaprotocol.io/vega/protos/vega/snapshot/v1"
)
func newTimestampedTotalStakeSnapshotFromProto(s *snapshot.TimestampedTotalStake) timestampedTotalStake {
return timestampedTotalStake{
Time: time.Unix(0, s.Time),
TotalStake: s.TotalStake,
}
}
func (toi timestampedTotalStake) toSnapshotProto() *snapshot.TimestampedTotalStake {
return &snapshot.TimestampedTotalStake{
TotalStake: toi.TotalStake,
Time: toi.Time.UnixNano(),
}
}
type SnapshotEngine struct {
*Engine
data []byte
stopped bool
key string
keys []string
}
func NewSnapshotEngine(
parameters types.TargetStakeParameters,
marketID string,
positionFactor num.Decimal,
) *SnapshotEngine {
key := (&types.PayloadLiquidityTarget{
Target: &snapshot.LiquidityTarget{MarketId: marketID},
}).Key()
return &SnapshotEngine{
Engine: NewEngine(parameters, marketID, positionFactor),
key: key,
keys: []string{key},
}
}
func (e *SnapshotEngine) UpdateParameters(parameters types.TargetStakeParameters) {
e.Engine.UpdateParameters(parameters)
}
func (e *SnapshotEngine) StopSnapshots() {
e.stopped = true
}
func (e *SnapshotEngine) RecordTotalStake(oi uint64, now time.Time) error {
if err := e.Engine.RecordTotalStake(oi, now); err != nil {
return err
}
return nil
}
func (e *SnapshotEngine) GetTargetStake(now time.Time) *num.Uint {
return e.Engine.GetTargetStake(now)
}
func (e *SnapshotEngine) Namespace() types.SnapshotNamespace {
return types.LiquidityTargetSnapshot
}
func (e *SnapshotEngine) Keys() []string {
return e.keys
}
func (e *SnapshotEngine) Stopped() bool {
return e.stopped
}
func (e *SnapshotEngine) GetState(k string) ([]byte, []types.StateProvider, error) {
if k != e.key {
return nil, nil, types.ErrSnapshotKeyDoesNotExist
}
state, err := e.serialise()
return state, nil, err
}
func (e *SnapshotEngine) LoadState(_ context.Context, payload *types.Payload) ([]types.StateProvider, error) {
if e.Namespace() != payload.Data.Namespace() {
return nil, types.ErrInvalidSnapshotNamespace
}
switch pl := payload.Data.(type) {
case *types.PayloadSpotLiquidityTarget:
// Check the payload is for this market
if e.marketID != pl.Target.MarketId {
return nil, types.ErrUnknownSnapshotType
}
e.now = time.Unix(0, pl.Target.CurrentTime)
e.scheduledTruncate = time.Unix(0, pl.Target.ScheduledTruncate)
e.current = pl.Target.CurrentTotalStake
e.previous = make([]timestampedTotalStake, 0, len(pl.Target.PreviousTotalStake))
e.max = newTimestampedTotalStakeSnapshotFromProto(pl.Target.MaxTotalStake)
for _, poi := range pl.Target.PreviousTotalStake {
e.previous = append(e.previous, newTimestampedTotalStakeSnapshotFromProto(poi))
}
var err error
e.data, err = proto.Marshal(payload.IntoProto())
return nil, err
default:
return nil, types.ErrUnknownSnapshotType
}
}
func (e *SnapshotEngine) serialisePrevious() []*snapshot.TimestampedTotalStake {
poi := make([]*snapshot.TimestampedTotalStake, 0, len(e.previous))
for _, p := range e.previous {
poi = append(poi, p.toSnapshotProto())
}
return poi
}
// serialise marshal the snapshot state, populating the data fields
// with updated values.
func (e *SnapshotEngine) serialise() ([]byte, error) {
if e.stopped {
return nil, nil
}
p := &snapshot.Payload{
Data: &snapshot.Payload_SpotLiquidityTarget{
SpotLiquidityTarget: &snapshot.SpotLiquidityTarget{
MarketId: e.marketID,
CurrentTime: e.now.UnixNano(),
ScheduledTruncate: e.scheduledTruncate.UnixNano(),
CurrentTotalStake: e.current,
PreviousTotalStake: e.serialisePrevious(),
MaxTotalStake: e.max.toSnapshotProto(),
},
},
}
var err error
e.data, err = proto.Marshal(p)
if err != nil {
return nil, err
}
return e.data, nil
}