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task.mode.go
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task.mode.go
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package pipeline
import (
"context"
"encoding/json"
"fmt"
"math/big"
"github.com/pkg/errors"
"github.com/shopspring/decimal"
"go.uber.org/multierr"
"github.com/smartcontractkit/chainlink/v2/core/logger"
)
// Return types:
//
// map[string]interface{}{
// "results": []interface{} containing any other type other pipeline tasks can return
// "occurrences": (int64)
// }
type ModeTask struct {
BaseTask `mapstructure:",squash"`
Values string `json:"values"`
AllowedFaults string `json:"allowedFaults"`
}
var _ Task = (*ModeTask)(nil)
func (t *ModeTask) Type() TaskType {
return TaskTypeMode
}
func (t *ModeTask) Run(_ context.Context, _ logger.Logger, vars Vars, inputs []Result) (result Result, runInfo RunInfo) {
var (
maybeAllowedFaults MaybeUint64Param
valuesAndErrs SliceParam
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 mode task > number allowed faults %v", faults, allowedFaults)}, runInfo
} else if len(values) == 0 {
return Result{Error: errors.Wrap(ErrWrongInputCardinality, "values")}, runInfo
}
type entry struct {
count uint64
original interface{}
}
var (
m = make(map[string]entry, len(values))
max uint64
modes []interface{}
)
for _, val := range values {
var comparable string
switch v := val.(type) {
case []byte:
comparable = string(v)
case int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64, float64, float32,
string, bool:
comparable = fmt.Sprintf("%v", v)
case *big.Int:
comparable = v.String()
case big.Int:
comparable = v.String()
case *decimal.Decimal:
comparable = v.String()
case decimal.Decimal:
comparable = v.String()
default:
bs, err := json.Marshal(v)
if err != nil {
return Result{Error: errors.Wrapf(ErrBadInput, "could not json stringify value: %v", err)}, runInfo
}
comparable = string(bs)
}
m[comparable] = entry{
count: m[comparable].count + 1,
original: val,
}
if m[comparable].count > max {
modes = []interface{}{val}
max = m[comparable].count
} else if m[comparable].count == max {
modes = append(modes, val)
}
}
return Result{Value: map[string]interface{}{
"results": modes,
"occurrences": max,
}}, runInfo
}