53 lines
1.1 KiB
Go
53 lines
1.1 KiB
Go
package main
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import (
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"context"
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"fmt"
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"time"
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"github.com/filecoin-project/go-address"
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"github.com/filecoin-project/lotus/api"
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"github.com/filecoin-project/lotus/chain/types"
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"go.opencensus.io/trace"
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)
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const LookbackCap = time.Hour
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var (
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ErrLookbackTooLong = fmt.Errorf("lookbacks of more than %s are disallowed", LookbackCap)
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)
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type GatewayAPI struct {
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api api.FullNode
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}
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func (a *GatewayAPI) getTipsetTimestamp(ctx context.Context, tsk types.TipSetKey) (time.Time, error) {
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if tsk.IsEmpty() {
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return time.Now(), nil
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}
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ts, err := a.api.ChainGetTipSet(ctx, tsk)
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if err != nil {
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return time.Time{}, err
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}
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return time.Unix(int64(ts.Blocks()[0].Timestamp), 0), nil
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}
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func (a *GatewayAPI) StateGetActor(ctx context.Context, actor address.Address, ts types.TipSetKey) (*types.Actor, error) {
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ctx, span := trace.StartSpan(ctx, "StateGetActor")
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defer span.End()
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when, err := a.getTipsetTimestamp(ctx, ts)
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if err != nil {
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return nil, err
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}
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if time.Since(when) > time.Hour {
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return nil, ErrLookbackTooLong
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}
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return a.api.StateGetActor(ctx, actor, ts)
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}
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