54 lines
1.2 KiB
Go
54 lines
1.2 KiB
Go
package common
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import (
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"encoding/json"
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"fmt"
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"gitea.maximumdirect.net/ejr/feedkit/event"
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)
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// PayloadBytes extracts a JSON payload into bytes suitable for json.Unmarshal.
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//
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// Supported payload shapes (weatherfeeder convention):
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// - json.RawMessage (recommended for raw events)
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// - []byte
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// - string (assumed to contain JSON)
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// - map[string]any (re-marshaled to JSON)
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//
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// If you add other raw representations later, extend this function.
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func PayloadBytes(e event.Event) ([]byte, error) {
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if e.Payload == nil {
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return nil, fmt.Errorf("payload is nil")
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}
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switch v := e.Payload.(type) {
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case json.RawMessage:
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if len(v) == 0 {
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return nil, fmt.Errorf("payload is empty json.RawMessage")
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}
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return []byte(v), nil
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case []byte:
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if len(v) == 0 {
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return nil, fmt.Errorf("payload is empty []byte")
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}
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return v, nil
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case string:
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if v == "" {
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return nil, fmt.Errorf("payload is empty string")
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}
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return []byte(v), nil
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case map[string]any:
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b, err := json.Marshal(v)
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if err != nil {
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return nil, fmt.Errorf("marshal map payload: %w", err)
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}
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return b, nil
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default:
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return nil, fmt.Errorf("unsupported payload type %T", e.Payload)
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}
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}
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