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* set compatibility level of schema if new subject is created * implement schema registry encoder and decoder * make fake schema registry server routing more readable
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| // Copyright © 2023 Meroxa, Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package schemaregistry | ||
|
|
||
| import ( | ||
| "context" | ||
|
|
||
| "github.com/conduitio/conduit/pkg/foundation/cerrors" | ||
| "github.com/conduitio/conduit/pkg/foundation/log" | ||
| "github.com/conduitio/conduit/pkg/record" | ||
| "github.com/lovromazgon/franz-go/pkg/sr" | ||
| ) | ||
|
|
||
| type Decoder struct { | ||
| client *Client | ||
| serde *sr.Serde | ||
| logger log.CtxLogger | ||
| } | ||
|
|
||
| func NewDecoder(client *Client, logger log.CtxLogger, serde *sr.Serde) *Decoder { | ||
| return &Decoder{ | ||
| client: client, | ||
| serde: serde, | ||
| logger: logger.WithComponent("schemaregistry.Decoder"), | ||
| } | ||
| } | ||
|
|
||
| func (d *Decoder) Decode(ctx context.Context, b record.RawData) (record.StructuredData, error) { | ||
| var out record.StructuredData | ||
| err := d.serde.Decode(b.Raw, &out) | ||
| if cerrors.Is(err, sr.ErrNotRegistered) { | ||
| err = d.findAndRegisterSchema(ctx, b) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| // retry decoding | ||
| err = d.serde.Decode(b.Raw, &out) | ||
| } | ||
| if err != nil { | ||
| return nil, cerrors.Errorf("failed to decode raw data: %w", err) | ||
| } | ||
|
|
||
| return out, nil | ||
| } | ||
|
|
||
| func (d *Decoder) findAndRegisterSchema(ctx context.Context, b record.RawData) error { | ||
| id, _, _ := d.serde.Header().DecodeID(b.Raw) // we know this won't throw an error since Decode didn't return ErrBadHeader | ||
| s, err := d.client.SchemaByID(ctx, id) | ||
| if err != nil { | ||
| return cerrors.Errorf("failed to get schema: %w", err) | ||
| } | ||
| sf, ok := DefaultSchemaFactories[s.Type] | ||
| if !ok { | ||
| return cerrors.Errorf("unknown schema type %q (%d)", s.Type.String(), s.Type) | ||
| } | ||
| schema, err := sf.Parse(s.Schema) | ||
| if err != nil { | ||
| return cerrors.Errorf("failed to parse schema: %w", err) | ||
| } | ||
|
|
||
| d.serde.Register( | ||
| id, | ||
| record.StructuredData{}, | ||
| sr.EncodeFn(encodeFn(schema, sr.SubjectSchema{ID: id})), | ||
| sr.DecodeFn(decodeFn(schema, sr.SubjectSchema{ID: id})), | ||
| ) | ||
| return nil | ||
| } | ||
|
|
||
| func decodeFn(schema Schema, ss sr.SubjectSchema) func(b []byte, a any) error { | ||
| return func(b []byte, a any) error { | ||
| err := schema.Unmarshal(b, a) | ||
| if err != nil { | ||
| return cerrors.Errorf("failed to unmarshal data with schema (ID: %v, subject: %v, version: %v): %w", ss.ID, ss.Subject, ss.Version, err) | ||
| } | ||
| return nil | ||
| } | ||
| } |
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