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Merge pull request redpanda-data#20820 from r-vasquez/jsonschema-serde
rpk: add support to produce/consume with jsonschema
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| // Copyright 2024 Redpanda Data, Inc. | ||
| // | ||
| // Use of this software is governed by the Business Source License | ||
| // included in the file licenses/BSL.md | ||
| // | ||
| // As of the Change Date specified in that file, in accordance with | ||
| // the Business Source License, use of this software will be governed | ||
| // by the Apache License, Version 2.0 | ||
|
|
||
| package serde | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "encoding/json" | ||
| "fmt" | ||
| "strings" | ||
|
|
||
| "github.com/santhosh-tekuri/jsonschema/v6" | ||
| "github.com/twmb/franz-go/pkg/sr" | ||
| ) | ||
|
|
||
| func compileJsonschema(ctx context.Context, cl *sr.Client, schema *sr.Schema) (*jsonschema.Schema, error) { | ||
| c := jsonschema.NewCompiler() | ||
| err := parseJsonschemaReferences(ctx, cl, schema, c) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("unable to parse json schema references: %v", err) | ||
| } | ||
| sch, err := jsonschema.UnmarshalJSON(strings.NewReader(schema.Schema)) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("unable to unmarshal base schema: %v", err) | ||
| } | ||
| baseFileName := "redpanda_jsonschema.json" | ||
| err = c.AddResource(baseFileName, sch) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("unable to add base json schema to the compiler resource: %v", err) | ||
| } | ||
| return c.Compile(baseFileName) | ||
| } | ||
|
|
||
| func newJsonschemaEncoder(schemaID int, jSchema *jsonschema.Schema) (serdeFunc, error) { | ||
| return func(record []byte) ([]byte, error) { | ||
| sch, err := jsonschema.UnmarshalJSON(bytes.NewReader(record)) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("unable to unmarshal record: %v", err) | ||
| } | ||
| err = jSchema.Validate(sch) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("unable to validate json schema: %v", err) | ||
| } | ||
| // Append the magic byte + the schema ID bytes. | ||
| var serdeHeader sr.ConfluentHeader | ||
| h, err := serdeHeader.AppendEncode(nil, schemaID, nil) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("unable to append header: %v", err) | ||
| } | ||
| return append(h, record...), nil | ||
| }, nil | ||
| } | ||
|
|
||
| func newJsonschemaDecoder(jSchema *jsonschema.Schema) (serdeFunc, error) { | ||
| return func(record []byte) ([]byte, error) { | ||
| var recordDec any | ||
| err := json.Unmarshal(record, &recordDec) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("unable to unmarshal record: %v", err) | ||
| } | ||
| err = jSchema.Validate(recordDec) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("unable to validate record: %v", err) | ||
| } | ||
| return record, nil | ||
| }, nil | ||
| } | ||
|
|
||
| func parseJsonschemaReferences(ctx context.Context, cl *sr.Client, schema *sr.Schema, compiler *jsonschema.Compiler) error { | ||
| for _, ref := range schema.References { | ||
| r, err := cl.SchemaByVersion(ctx, ref.Subject, ref.Version) | ||
| if err != nil { | ||
| return fmt.Errorf("unable to get schema with subject %q and version %v: %v", ref.Subject, ref.Version, err) | ||
| } | ||
| refSchema := r.Schema | ||
|
|
||
| sch, err := jsonschema.UnmarshalJSON(strings.NewReader(refSchema.Schema)) | ||
| if err != nil { | ||
| return fmt.Errorf("unable to unmarshal json schema %q: %v", ref.Name, err) | ||
| } | ||
|
|
||
| err = compiler.AddResource(ref.Name, sch) | ||
| if err != nil { | ||
| return fmt.Errorf("unable to add schema %v: %v", ref.Name, err) | ||
| } | ||
|
|
||
| err = parseJsonschemaReferences(ctx, cl, &refSchema, compiler) | ||
| if err != nil { | ||
| return fmt.Errorf("unable to parse schema with subject %q and version %v: %v", ref.Subject, ref.Version, err) | ||
| } | ||
| } | ||
| return nil | ||
| } |
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