specgen: add more tests, rename connector to specification

Makefile

@@ -1,6 +1,11 @@
 .PHONY: test
 test:
 	go test $(GOTEST_FLAGS) -race ./...
+	echo
+	echo "Running integration tests..."
+	echo
+	cd specgen/specgen/testdata/ && go test $(GOTEST_FLAGS) -race ./...
+
 
 .PHONY: fmt
 fmt:

acceptance_testing.go

@@ -14,6 +14,8 @@
 
 package sdk
 
+//nolint:dupword // the tests are commented out while specgen is WIP
+// todo acceptance tests will be re-enabled in https://github.com/ConduitIO/conduit-connector-sdk/issues/210
 /*
 
 import (

destination_middleware.go

@@ -69,6 +69,7 @@ func (c *DefaultDestinationMiddleware) Validate(ctx context.Context) error {
 		f := valType.Field(i)
 		if f.Type.Implements(validatableInterface) {
 			// This is a DestinationConfig struct, validate it.
+			//nolint:forcetypeassert // type checked above with f.Type.Implements()
 			errs = append(errs, val.Field(i).Interface().(Validatable).Validate(ctx))
 		}
 	}
@@ -87,6 +88,7 @@ func DestinationWithMiddleware(d Destination) Destination {
 	}
 	cfgVal = cfgVal.Elem()
 
+	// Collect all middlewares from the config and wrap the destination with them
 	var mw []DestinationMiddleware
 	for i := range cfgVal.NumField() {
 		field := cfgVal.Field(i)
@@ -98,6 +100,7 @@ func DestinationWithMiddleware(d Destination) Destination {
 		}
 		if field.Type().Implements(destinationMiddlewareType) {
 			// This is a middleware config, store it.
+			//nolint:forcetypeassert // type checked above with field.Type().Implements()
 			mw = append(mw, field.Interface().(DestinationMiddleware))
 		}
 	}
@@ -188,7 +191,7 @@ func (*destinationWithBatch) getBatchConfig(ctx context.Context) DestinationWith
 type DestinationWithRateLimit struct {
 	UnimplementedDestinationConfig
 
-	// Maximum umber of records written per second (0 means no rate limit).
+	// Maximum number of records written per second (0 means no rate limit).
 	RatePerSecond float64 `json:"sdk.rate.perSecond" default:"0" validate:"gt=-1"`
 	// Allow bursts of at most X records (0 or less means that bursts are not
 	// limited). Only takes effect if a rate limit per second is set. Note that

source_middleware.go

@@ -22,11 +22,10 @@ import (
 	"sync"
 	"time"
 
-	"github.com/conduitio/conduit-connector-sdk/internal"
-
 	"github.com/conduitio/conduit-commons/cchan"
 	"github.com/conduitio/conduit-commons/config"
 	"github.com/conduitio/conduit-commons/opencdc"
+	"github.com/conduitio/conduit-connector-sdk/internal"
 	"github.com/conduitio/conduit-connector-sdk/schema"
 	"github.com/jpillora/backoff"
 )
@@ -65,6 +64,7 @@ func (c *DefaultSourceMiddleware) Validate(ctx context.Context) error {
 		f := valType.Field(i)
 		if f.Type.Implements(validatableInterface) {
 			// This is a DestinationConfig struct, validate it.
+			//nolint:forcetypeassert // type checked above with f.Type.Implements()
 			errs = append(errs, val.Field(i).Interface().(Validatable).Validate(ctx))
 		}
 	}
@@ -83,6 +83,7 @@ func SourceWithMiddleware(s Source) Source {
 	}
 	cfgVal = cfgVal.Elem()
 
+	// Collect all middlewares from the config and wrap the source with them
 	var mw []SourceMiddleware
 	for i := range cfgVal.NumField() {
 		field := cfgVal.Field(i)
@@ -94,6 +95,7 @@ func SourceWithMiddleware(s Source) Source {
 		}
 		if field.Type().Implements(sourceMiddlewareType) {
 			// This is a middleware config, store it.
+			//nolint:forcetypeassert // type checked above with field.Type().Implements()
 			mw = append(mw, field.Interface().(SourceMiddleware))
 		}
 	}

specgen/README.md

@@ -1,3 +1,3 @@
 # Specgen
 
-TBD
+TBD

specgen/main.go

@@ -81,8 +81,12 @@ func parseFlags() Args {
 	return args
 }
 
+// extractYAMLSpecification extracts the YAML specification from the connector
+// found in `path`.
+// `path` is the directory path to the package that contains the `Connector` variable.
 func extractYAMLSpecification(ctx context.Context, path string) ([]byte, error) {
-	// Get the import path of the package.
+	// Get the import path of the package (that contains the connector code).
+	// It's needed in extractYAMLProgram to get the `Connector` variable.
 	out, err := specgen.Run(ctx, path, "go", "list", "-m")
 	if err != nil {
 		return nil, err
@@ -97,12 +101,14 @@ func extractYAMLSpecification(ctx context.Context, path string) ([]byte, error)
 	return runInDir(ctx, program, path)
 }
 
-func writeProgram(importPath string) ([]byte, error) {
+// writeProgram writes the program that extracts the YAML specs
+// from the connector that can be found at the connectorImportPath.
+func writeProgram(connectorImportPath string) ([]byte, error) {
 	var program bytes.Buffer
 	data := reflectData{
-		ImportPath: importPath,
+		ImportPath: connectorImportPath,
 	}
-	if err := reflectProgram.Execute(&program, &data); err != nil {
+	if err := extractYAMLProgram.Execute(&program, &data); err != nil {
 		return nil, err
 	}
 	return program.Bytes(), nil
@@ -122,13 +128,13 @@ func runInDir(ctx context.Context, program []byte, dir string) ([]byte, error) {
 		}
 	}()
 	const progSource = "prog.go"
-	var progBinary = "prog.bin"
+	progBinary := "prog.bin"
 	if runtime.GOOS == "windows" {
 		// Windows won't execute a program unless it has a ".exe" suffix.
 		progBinary += ".exe"
 	}
 
-	if err := os.WriteFile(filepath.Join(tmpDir, progSource), program, 0600); err != nil {
+	if err := os.WriteFile(filepath.Join(tmpDir, progSource), program, 0o600); err != nil {
 		return nil, err
 	}
 
@@ -155,9 +161,9 @@ type reflectData struct {
 	ImportPath string
 }
 
-// This program uses reflection to traverse the connector configuration and
-// prints the extracted specification to standard output.
-var reflectProgram = template.Must(template.New("program").Parse(`
+// extractYAMLProgram extract the YAML specs from a connector and writes it
+// to standard output. This program uses reflection to traverse the connector configuration.
+var extractYAMLProgram = template.Must(template.New("program").Parse(`
 package main
 
 import (

specgen/specgen/model/v1/model.go

@@ -37,27 +37,27 @@ var Changelog = evolviconf.Changelog{
 }
 
 type Specification struct {
-	Version   string    `json:"version"`
-	Connector Connector `json:"connector"`
+	Version                string                 `json:"version" yaml:"version"`
+	ConnectorSpecification ConnectorSpecification `json:"specification" yaml:"specification"`
 }
 
-type Connector struct {
-	Name        string `json:"name"`
-	Summary     string `json:"summary"`
-	Description string `json:"description"`
-	Version     string `json:"version"`
-	Author      string `json:"author"`
+type ConnectorSpecification struct {
+	Name        string `json:"name" yaml:"name"`
+	Summary     string `json:"summary" yaml:"summary"`
+	Description string `json:"description" yaml:"description"`
+	Version     string `json:"version" yaml:"version"`
+	Author      string `json:"author" yaml:"author"`
 
-	Source      Source      `json:"source,omitempty"`
-	Destination Destination `json:"destination,omitempty"`
+	Source      Source      `json:"source,omitempty" yaml:"source,omitempty"`
+	Destination Destination `json:"destination,omitempty" yaml:"destination,omitempty"`
 }
 
 type Source struct {
-	Parameters Parameters `json:"parameters,omitempty"`
+	Parameters Parameters `json:"parameters,omitempty" yaml:"parameters,omitempty"`
 }
 
 type Destination struct {
-	Parameters Parameters `json:"parameters,omitempty"`
+	Parameters Parameters `json:"parameters,omitempty" yaml:"parameters,omitempty"`
 }
 
 type Parameters []Parameter
@@ -83,10 +83,10 @@ type Validation struct {
 
 // ToConfig implements evolviconf.VersionedConfig.
 func (s Specification) ToConfig() (pconnector.Specification, error) {
-	return s.Connector.ToConfig()
+	return s.ConnectorSpecification.ToConfig()
 }
 
-func (c Connector) ToConfig() (pconnector.Specification, error) {
+func (c ConnectorSpecification) ToConfig() (pconnector.Specification, error) {
 	sourceParams, err := c.Source.ToConfig()
 	if err != nil {
 		return pconnector.Specification{}, err
@@ -220,12 +220,12 @@ func (v Validation) ToConfig() (config.Validation, error) {
 
 func (s Specification) FromConfig(spec pconnector.Specification) Specification {
 	return Specification{
-		Version:   LatestVersion,
-		Connector: Connector{}.FromConfig(spec),
+		Version:                LatestVersion,
+		ConnectorSpecification: ConnectorSpecification{}.FromConfig(spec),
 	}
 }
 
-func (c Connector) FromConfig(spec pconnector.Specification) Connector {
+func (c ConnectorSpecification) FromConfig(spec pconnector.Specification) ConnectorSpecification {
 	c.Name = spec.Name
 	c.Summary = spec.Summary
 	c.Description = spec.Description
@@ -238,18 +238,18 @@ func (c Connector) FromConfig(spec pconnector.Specification) Connector {
 }
 
 func (Parameters) FromConfig(params config.Parameters) Parameters {
-	var p Parameters
+	p := make(Parameters, len(params))
 
 	names := make([]string, 0, len(params))
 	for k := range maps.Keys(params) {
 		names = append(names, k)
 	}
 	slices.Sort(names)
 
-	for _, name := range names {
+	for i, name := range names {
 		paramOut := Parameter{}.FromConfig(params[name])
 		paramOut.Name = name
-		p = append(p, paramOut)
+		p[i] = paramOut
 	}
 	return p
 }
@@ -284,9 +284,9 @@ func (ParameterType) FromConfig(t config.ParameterType) ParameterType {
 }
 
 func (Validations) FromConfig(v []config.Validation) Validations {
-	var validations Validations
-	for _, validation := range v {
-		validations = append(validations, Validation{}.FromConfig(validation))
+	validations := make(Validations, len(v))
+	for i, validation := range v {
+		validations[i] = Validation{}.FromConfig(validation)
 	}
 	return validations
 }
@@ -300,12 +300,12 @@ func (v Validation) FromConfig(validation config.Validation) Validation {
 	case config.ValidationGreaterThan:
 		return Validation{
 			Type:  config.ValidationTypeGreaterThan.String(),
-			Value: fmt.Sprintf("%f", val.V),
+			Value: fmt.Sprintf("%g", val.V),
 		}
 	case config.ValidationLessThan:
 		return Validation{
 			Type:  config.ValidationTypeLessThan.String(),
-			Value: fmt.Sprintf("%f", val.V),
+			Value: fmt.Sprintf("%g", val.V),
 		}
 	case config.ValidationInclusion:
 		return Validation{

specgen/specgen/specgen.go

@@ -64,13 +64,17 @@ func SpecificationToYaml(spec pconnector.Specification) ([]byte, error) {
 	return yamlMarshal(v1.Specification{}.FromConfig(spec))
 }
 
+// WriteAndCombine combines the user-provided, custom information from an existing YAML file
+// with the connector spec.
+// `path` is the path to the existing YAML file.
+// `yamlBytes` contains the connector's YAML spec.
 func WriteAndCombine(yamlBytes []byte, path string) error {
 	// Read the existing YAML file.
 	existingRaw, err := os.ReadFile(path)
 	if err != nil {
 		if os.IsNotExist(err) {
 			// If the file doesn't exist, just write the new YAML directly
-			if err := os.WriteFile(path, yamlBytes, 0600); err != nil {
+			if err := os.WriteFile(path, yamlBytes, 0o600); err != nil {
 				return fmt.Errorf("failed to write YAML to file: %w", err)
 			}
 			return nil
@@ -79,11 +83,11 @@ func WriteAndCombine(yamlBytes []byte, path string) error {
 	}
 
 	out := struct {
-		Version   string `yaml:"version"`
-		Connector struct {
-			v1.Connector  `yaml:",inline"`
-			UnknownFields map[string]any `yaml:",inline"`
-		} `yaml:"connector"`
+		Version       string `yaml:"version"`
+		Specification struct {
+			v1.ConnectorSpecification `yaml:",inline"`
+			UnknownFields             map[string]any `yaml:",inline"`
+		} `yaml:"specification"`
 		UnknownFields map[string]any `yaml:",inline"`
 	}{}
 
@@ -102,7 +106,7 @@ func WriteAndCombine(yamlBytes []byte, path string) error {
 
 	// Merge the new map into the existing map, preserving existing fields
 	connectorUnknownFields, _ := unknownFields["connector"].(map[string]any)
-	connTyp := reflect.TypeFor[v1.Connector]()
+	connTyp := reflect.TypeFor[v1.ConnectorSpecification]()
 	for i := range connTyp.NumField() {
 		f := connTyp.Field(i)
 		fieldName := getYAMLFieldName(f)
@@ -113,7 +117,7 @@ func WriteAndCombine(yamlBytes []byte, path string) error {
 	delete(unknownFields, "connector")
 
 	out.UnknownFields = unknownFields
-	out.Connector.UnknownFields = connectorUnknownFields
+	out.Specification.UnknownFields = connectorUnknownFields
 
 	// Marshal the merged map back to YAML bytes
 	mergedYAML, err := yamlMarshal(out)
@@ -122,7 +126,7 @@ func WriteAndCombine(yamlBytes []byte, path string) error {
 	}
 
 	// Write the merged YAML to the file
-	if err := os.WriteFile(path, mergedYAML, 0600); err != nil {
+	if err := os.WriteFile(path, mergedYAML, 0o600); err != nil {
 		return fmt.Errorf("failed to write merged YAML to file: %w", err)
 	}
 
@@ -168,7 +172,7 @@ func parseParameters(ctx context.Context, cfg any) (config.Parameters, error) {
 // from the cfg struct and updates the default value if that field is set to
 // anything other than the zero value. It ignores fields that are not found.
 func overwriteDefaults(params config.Parameters, cfg any) {
-	traverseFields(cfg, func(path string, field reflect.StructField, value reflect.Value) {
+	traverseFields(cfg, func(path string, _ reflect.StructField, value reflect.Value) {
 		param, ok := params[path]
 		if !ok {
 			// This shouldn't happen if the parameters were extracted from the