52 lines
1.7 KiB
Go
52 lines
1.7 KiB
Go
package buffering
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import (
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"context"
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"github.com/cloudevents/sdk-go/v1/binding"
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)
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// BufferMessage does the same than CopyMessage and it also bounds the original Message
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// lifecycle to the newly created message: calling Finish() on the returned message calls m.Finish()
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func BufferMessage(ctx context.Context, m binding.Message, transformers ...binding.TransformerFactory) (binding.Message, error) {
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result, err := CopyMessage(ctx, m, transformers...)
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if err != nil {
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return nil, err
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}
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return binding.WithFinish(result, func(err error) { _ = m.Finish(err) }), nil
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}
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// CopyMessage reads m once and creates an in-memory copy depending on the encoding of m.
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// The returned copy is not dependent on any transport and can be read many times.
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// When the copy can be forgot, the copied message must be finished with Finish() message to release the memory
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func CopyMessage(ctx context.Context, m binding.Message, transformers ...binding.TransformerFactory) (binding.Message, error) {
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originalMessageEncoding := m.Encoding()
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if originalMessageEncoding == binding.EncodingUnknown {
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return nil, binding.ErrUnknownEncoding
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}
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if originalMessageEncoding == binding.EncodingEvent {
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e, _, err := binding.ToEvent(ctx, m, transformers...)
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if err != nil {
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return nil, err
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}
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return binding.EventMessage(e), nil
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}
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sm := structBufferedMessage{}
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bm := binaryBufferedMessage{}
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encoding, err := binding.RunDirectEncoding(ctx, m, &sm, &bm, transformers)
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if encoding == binding.EncodingStructured {
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return &sm, err
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} else if encoding == binding.EncodingBinary {
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return &bm, err
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} else {
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e, _, err := binding.ToEvent(ctx, m, transformers...)
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if err != nil {
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return nil, err
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}
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return binding.EventMessage(e), nil
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}
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}
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