func averageResulter(ctx context.Context, result model.KeyedResult, challenge model.Challenge) error {
tasks := make([]model.Task, len(challenge.Tasks))
if err := datastore.GetMulti(ctx, challenge.Tasks, tasks); err != nil {
return err
}
var user model.User
if err := datastore.Get(ctx, result.Key.Parent().Parent(), &user); err != nil {
return err
}
var nrOfComputations float64
average := model.Skills{}
for i, task := range tasks {
taskResult, err := Tasker(task.Tasker).Call(ctx, result, *task.Key(challenge.Tasks[i]), user, result.StartTimes[getTaskIndex(challenge, challenge.Tasks[i])])
if err != nil {
// TODO: ignore error for now. We`ll treat it after we have all the taskers available
//return err
} else {
average = average.Add(taskResult)
nrOfComputations++
}
}
result.Skills = average.DivBy(nrOfComputations)
result.Computed = time.Now()
_, err := result.Put(ctx, result.Key)
return err
}
func init() {
RegisterResulter(Average, func(ctx context.Context, resultKey *datastore.Key) error {
var result model.Result
if err := datastore.Get(ctx, resultKey, &result); err != nil {
return err
}
var challenge model.Challenge
if err := datastore.Get(ctx, result.Challenge, &challenge); err != nil {
return err
}
var tasks model.Tasks
if err := datastore.GetMulti(ctx, challenge.Tasks, &tasks); err != nil {
return err
}
weightSum := model.Skills{} // this could be SkillWeights, but would need more conversions
average := model.Skills{}
for i, task := range tasks {
taskResult, err := Tasker(task.Tasker).Call(ctx, challenge.Tasks[i], resultKey.Parent().Parent())
if err != nil {
return err
}
average = average.Add(taskResult.Mul(model.Skills(task.SkillWeights)))
weightSum = weightSum.Add(model.Skills(task.SkillWeights))
}
result.Skills = average.Div(weightSum)
result.Computed = time.Now()
_, err := result.Put(ctx, resultKey)
return err
})
}