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task.sum.go
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task.sum.go
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package pipeline
import (
"context"
"github.com/pkg/errors"
"github.com/shopspring/decimal"
"go.uber.org/multierr"
"github.com/smartcontractkit/chainlink/v2/core/logger"
)
// Return types:
//
// *decimal.Decimal
type SumTask struct {
BaseTask `mapstructure:",squash"`
Values string `json:"values"`
AllowedFaults string `json:"allowedFaults"`
}
var _ Task = (*SumTask)(nil)
func (t *SumTask) Type() TaskType {
return TaskTypeSum
}
func (t *SumTask) Run(_ context.Context, _ logger.Logger, vars Vars, inputs []Result) (result Result, runInfo RunInfo) {
var (
maybeAllowedFaults MaybeUint64Param
valuesAndErrs SliceParam
decimalValues DecimalSliceParam
allowedFaults int
faults int
)
err := multierr.Combine(
errors.Wrap(ResolveParam(&maybeAllowedFaults, From(t.AllowedFaults)), "allowedFaults"),
errors.Wrap(ResolveParam(&valuesAndErrs, From(VarExpr(t.Values, vars), JSONWithVarExprs(t.Values, vars, true), Inputs(inputs))), "values"),
)
if err != nil {
return Result{Error: err}, runInfo
}
if allowed, isSet := maybeAllowedFaults.Uint64(); isSet {
allowedFaults = int(allowed)
} else {
allowedFaults = len(valuesAndErrs) - 1
}
values, faults := valuesAndErrs.FilterErrors()
if faults > allowedFaults {
return Result{Error: errors.Wrapf(ErrTooManyErrors, "Number of faulty inputs %v to sum task > number allowed faults %v", faults, allowedFaults)}, runInfo
} else if len(values) == 0 {
return Result{Error: errors.Wrap(ErrWrongInputCardinality, "values")}, runInfo
}
err = decimalValues.UnmarshalPipelineParam(values)
if err != nil {
return Result{Error: errors.Wrapf(ErrBadInput, "values: %v", err)}, runInfo
}
sum := decimal.NewFromInt(0)
for _, val := range decimalValues {
sum = sum.Add(val)
}
return Result{Value: sum}, runInfo
}