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add map error pipeline stage #8

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merged 1 commit into from
Nov 11, 2024
Merged

add map error pipeline stage #8

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19 changes: 19 additions & 0 deletions etl/pipeline/stage.go
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,25 @@ func Map[T, V any](mapFunc func(context.Context, *PipelineState, T) V) stage[T,
}
}

func MapError[T, V any](mapFunc func(context.Context, *PipelineState, T) (V, error)) stage[T, V] {
return func(ctx context.Context, p *PipelineState, inChannel chan T) (chan V, error) {
// create channel with buffer for each element in inChannel
mapChan := make(chan V, len(inChannel))

// map values from inChannel
for inValue := range inChannel {
value, err := mapFunc(ctx, p, inValue)
if err != nil {
return nil, err
}
mapChan <- value
}
close(mapChan)

return mapChan, nil
}
}

func Filter[T any](filterFunc func(context.Context, *PipelineState, T) bool) stage[T, T] {
return func(ctx context.Context, p *PipelineState, inChannel chan T) (chan T, error) {
// optimistically allocate buffer for all elements in input channel
Expand Down