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Merge pull request #143 from nyaruka/dynamo_get_put
Add basic get/put operations to dynamo service
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| package dynamo | ||
|
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| import ( | ||
| "bytes" | ||
| "compress/gzip" | ||
| "encoding/json" | ||
| "fmt" | ||
|
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| "github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue" | ||
| "github.com/aws/aws-sdk-go-v2/service/dynamodb/types" | ||
| ) | ||
|
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| type Marshaler interface { | ||
| MarshalDynamo() (map[string]types.AttributeValue, error) | ||
| } | ||
|
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| type Unmarshaler interface { | ||
| UnmarshalDynamo(map[string]types.AttributeValue) error | ||
| } | ||
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| func marshal(v any) (map[string]types.AttributeValue, error) { | ||
| marshaler, ok := v.(Marshaler) | ||
| if ok { | ||
| return marshaler.MarshalDynamo() | ||
| } | ||
|
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| return attributevalue.MarshalMap(v) | ||
| } | ||
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| func unmarshal(m map[string]types.AttributeValue, v any) error { | ||
| unmarshaler, ok := v.(Unmarshaler) | ||
| if ok { | ||
| return unmarshaler.UnmarshalDynamo(m) | ||
| } | ||
|
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| return attributevalue.UnmarshalMap(m, v) | ||
| } | ||
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| func MarshalJSONGZ(v any) ([]byte, error) { | ||
| buf := &bytes.Buffer{} | ||
| w := gzip.NewWriter(buf) | ||
|
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| if err := json.NewEncoder(w).Encode(v); err != nil { | ||
| return nil, fmt.Errorf("error encoding value as json+gzip: %w", err) | ||
| } | ||
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| w.Close() | ||
|
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| return buf.Bytes(), nil | ||
| } | ||
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| func UnmarshalJSONGZ(d []byte, v any) error { | ||
| r, err := gzip.NewReader(bytes.NewReader(d)) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| if err := json.NewDecoder(r).Decode(v); err != nil { | ||
| return fmt.Errorf("error decoding value from json+gzip: %w", err) | ||
| } | ||
|
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| return nil | ||
| } |
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