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Add a ReportCodec implementation that uses the generic Codec, fallbac…
…k to using the current specific ReportCodec if the generic codec is not provided (#8)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| package median | ||
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| import ( | ||
| "cmp" | ||
| "math/big" | ||
| "slices" | ||
|
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| "github.com/smartcontractkit/libocr/commontypes" | ||
| "github.com/smartcontractkit/libocr/offchainreporting2/reportingplugin/median" | ||
| ) | ||
|
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| type aggregatedAttributedObservation struct { | ||
| Timestamp uint32 | ||
| Observers [32]commontypes.OracleID | ||
| Observations []*big.Int | ||
| JuelsPerFeeCoin *big.Int | ||
| } | ||
|
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| func aggregate(observations []median.ParsedAttributedObservation) *aggregatedAttributedObservation { | ||
| // defensive copy | ||
| n := len(observations) | ||
| observations = slices.Clone(observations) | ||
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| aggregated := &aggregatedAttributedObservation{Observations: make([]*big.Int, len(observations))} | ||
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| slices.SortFunc(observations, func(a, b median.ParsedAttributedObservation) int { | ||
| return cmp.Compare(a.Timestamp, b.Timestamp) | ||
| }) | ||
| aggregated.Timestamp = observations[n/2].Timestamp | ||
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| slices.SortFunc(observations, func(a, b median.ParsedAttributedObservation) int { | ||
| return a.JuelsPerFeeCoin.Cmp(b.JuelsPerFeeCoin) | ||
| }) | ||
| aggregated.JuelsPerFeeCoin = observations[n/2].JuelsPerFeeCoin | ||
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| slices.SortFunc(observations, func(a, b median.ParsedAttributedObservation) int { | ||
| return a.Value.Cmp(b.Value) | ||
| }) | ||
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| for i, o := range observations { | ||
| aggregated.Observers[i] = o.Observer | ||
| aggregated.Observations[i] = o.Value | ||
| } | ||
| return aggregated | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,42 @@ | ||
| package median | ||
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| import ( | ||
| "context" | ||
| "fmt" | ||
| "math/big" | ||
|
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| "github.com/smartcontractkit/chainlink-common/pkg/types" | ||
| "github.com/smartcontractkit/libocr/offchainreporting2/reportingplugin/median" | ||
| ocrtypes "github.com/smartcontractkit/libocr/offchainreporting2plus/types" | ||
| ) | ||
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| const typeName = "MedianReport" | ||
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| type reportCodec struct { | ||
| codec types.Codec | ||
| } | ||
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| var _ median.ReportCodec = &reportCodec{} | ||
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| func (r *reportCodec) BuildReport(observations []median.ParsedAttributedObservation) (ocrtypes.Report, error) { | ||
| if len(observations) == 0 { | ||
| return nil, fmt.Errorf("cannot build report from empty attributed observations") | ||
| } | ||
|
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| return r.codec.Encode(context.Background(), aggregate(observations), typeName) | ||
| } | ||
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| func (r *reportCodec) MedianFromReport(report ocrtypes.Report) (*big.Int, error) { | ||
| agg := &aggregatedAttributedObservation{} | ||
| if err := r.codec.Decode(context.Background(), report, agg, typeName); err != nil { | ||
| return nil, err | ||
| } | ||
| observations := make([]*big.Int, len(agg.Observations)) | ||
| copy(observations, agg.Observations) | ||
| medianObservation := len(agg.Observations) / 2 | ||
| return agg.Observations[medianObservation], nil | ||
| } | ||
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| func (r *reportCodec) MaxReportLength(n int) (int, error) { | ||
| return r.codec.GetMaxDecodingSize(context.Background(), n, typeName) | ||
| } |
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