refactor: change folder, package structure; integrate with cobra (#27)

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## This PR
<!-- add the description of the PR here -->

refactor: changes folder, package structure; integrates CLI with cobra

### Related Issues
<!-- add here the GitHub issue that this PR resolves if applicable -->

Fixes #20 (comment)

---------

Signed-off-by: Florin-Mihai Anghel <fanghel@google.com>
Signed-off-by: Florin-Mihai Anghel <44744433+anghelflorinm@users.noreply.github.com>
Co-authored-by: Michael Beemer <beeme1mr@users.noreply.github.com>

cmd/generate/generate.go

@@ -0,0 +1,29 @@
+package generate
+
+import (
+	"codegen/cmd/generate/golang"
+	"codegen/internal/flagkeys"
+
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+// Root for `generate“ sub-commands, handling code generation for flag accessors.
+var Root = &cobra.Command{
+	Use:   "generate",
+	Short: "Code generation for flag accessors for OpenFeature.",
+	Long:  `Code generation for flag accessors for OpenFeature.`,
+}
+
+func init() {
+	// Add subcommands.
+	Root.AddCommand(golang.Cmd)
+
+	// Add flags.
+	Root.PersistentFlags().String(flagkeys.FlagManifestPath, "", "Path to the flag manifest.")
+	Root.MarkPersistentFlagRequired(flagkeys.FlagManifestPath)
+	viper.BindPFlag(flagkeys.FlagManifestPath, Root.PersistentFlags().Lookup(flagkeys.FlagManifestPath))
+	Root.PersistentFlags().String(flagkeys.OutputPath, "", "Output path for the codegen")
+	viper.BindPFlag(flagkeys.OutputPath, Root.PersistentFlags().Lookup(flagkeys.OutputPath))
+	Root.MarkPersistentFlagRequired(flagkeys.OutputPath)
+}

cmd/generate/golang/golang.go

@@ -0,0 +1,32 @@
+package golang
+
+import (
+	"codegen/internal/flagkeys"
+	"codegen/internal/generate"
+	"codegen/internal/generate/plugins/golang"
+
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+// Cmd for `generate“ command, handling code generation for flag accessors
+var Cmd = &cobra.Command{
+	Use:   "go",
+	Short: "Generate Golang flag accessors for OpenFeature.",
+	Long:  `Generate Golang flag accessors for OpenFeature.`,
+	RunE: func(cmd *cobra.Command, args []string) error {
+		params := golang.Params{
+			GoPackage: viper.GetString(flagkeys.GoPackageName),
+		}
+		gen := golang.NewGenerator(params)
+		err := generate.CreateFlagAccessors(gen)
+		return err
+	},
+}
+
+func init() {
+	Cmd.Flags().String(flagkeys.GoPackageName, "", "Name of the Go package to be generated.")
+	Cmd.MarkFlagRequired(flagkeys.GoPackageName)
+	viper.BindPFlag(flagkeys.GoPackageName, Cmd.Flags().Lookup(flagkeys.GoPackageName))
+
+}

cmd/root.go

@@ -0,0 +1,30 @@
+package cmd
+
+import (
+	"fmt"
+	"os"
+
+	"codegen/cmd/generate"
+
+	"github.com/spf13/cobra"
+)
+
+// rootCmd represents the base command when called without any subcommands
+var rootCmd = &cobra.Command{
+	Use:   "openfeature",
+	Short: "CLI for OpenFeature.",
+	Long:  `CLI for OpenFeature related functionalities.`,
+}
+
+// Execute adds all child commands to the root command and sets flags appropriately.
+// This is called by main.main(). It only needs to happen once to the rootCmd.
+func Execute() {
+	if err := rootCmd.Execute(); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+}
+
+func init() {
+	rootCmd.AddCommand(generate.Root)
+}

go.mod

@@ -8,7 +8,31 @@ require (
 	github.com/santhosh-tekuri/jsonschema/v5 v5.3.1
 )
 
+require (
+	github.com/fsnotify/fsnotify v1.7.0 // indirect
+	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/magiconair/properties v1.8.7 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
+	github.com/sagikazarmark/locafero v0.4.0 // indirect
+	github.com/sagikazarmark/slog-shim v0.1.0 // indirect
+	github.com/sourcegraph/conc v0.3.0 // indirect
+	github.com/spf13/afero v1.11.0 // indirect
+	github.com/spf13/cast v1.6.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/subosito/gotenv v1.6.0 // indirect
+	go.uber.org/atomic v1.9.0 // indirect
+	go.uber.org/multierr v1.9.0 // indirect
+	golang.org/x/sys v0.18.0 // indirect
+	golang.org/x/text v0.18.0 // indirect
+	gopkg.in/ini.v1 v1.67.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
+
 require (
 	github.com/go-logr/logr v1.4.2 // indirect
+	github.com/spf13/cobra v1.8.1
+	github.com/spf13/viper v1.19.0
 	golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842 // indirect
 )

go.sum

@@ -1,14 +1,70 @@
+github.com/cpuguy83/go-md2man/v2 v2.0.4/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
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+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/fsnotify/fsnotify v1.7.0 h1:8JEhPFa5W2WU7YfeZzPNqzMP6Lwt7L2715Ggo0nosvA=
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 github.com/go-logr/logr v1.4.2/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
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 github.com/open-feature/go-sdk v1.13.0/go.mod h1:poPa+RFCJumHcb59wgp+tnSyNvMU2C07ykFJ0gczyaM=
+github.com/pelletier/go-toml/v2 v2.2.2 h1:aYUidT7k73Pcl9nb2gScu7NSrKCSHIDE89b3+6Wq+LM=
+github.com/pelletier/go-toml/v2 v2.2.2/go.mod h1:1t835xjRzz80PqgE6HHgN2JOsmgYu/h4qDAS4n929Rs=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/sagikazarmark/locafero v0.4.0 h1:HApY1R9zGo4DBgr7dqsTH/JJxLTTsOt7u6keLGt6kNQ=
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+github.com/sagikazarmark/slog-shim v0.1.0 h1:diDBnUNK9N/354PgrxMywXnAwEr1QZcOr6gto+ugjYE=
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 github.com/santhosh-tekuri/jsonschema/v5 v5.3.1 h1:lZUw3E0/J3roVtGQ+SCrUrg3ON6NgVqpn3+iol9aGu4=
 github.com/santhosh-tekuri/jsonschema/v5 v5.3.1/go.mod h1:uToXkOrWAZ6/Oc07xWQrPOhJotwFIyu2bBVN41fcDUY=
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+github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
+github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
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 golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842 h1:vr/HnozRka3pE4EsMEg1lgkXJkTFJCVUX+S/ZT6wYzM=
 golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842/go.mod h1:XtvwrStGgqGPLc4cjQfWqZHG1YFdYs6swckp8vpsjnc=
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internal/flagkeys/flagkeys.go

@@ -0,0 +1,14 @@
+// Package commonflags contains keys for all command-line flags related to openfeature CLI.
+package flagkeys
+
+const (
+	// `generate` flags:
+	// FlagManifestPath is the key for the flag that stores the flag manifest path.
+	FlagManifestPath = "flag_manifest_path"
+	// OutputPath is the key for the flag that stores the output path.
+	OutputPath = "output_path"
+
+	// `generate go` flags:
+	// GoPackageName is the key for the flag that stores the Golang package name.
+	GoPackageName = "package_name"
+)

internal/generate/generate.go

@@ -0,0 +1,61 @@
+// Package generate contains the top level functions used for generating flag accessors.
+package generate
+
+import (
+	"bytes"
+	"codegen/internal/flagkeys"
+	"codegen/internal/generate/manifestutils"
+	"codegen/internal/generate/types"
+	"fmt"
+	"os"
+	"path"
+	"path/filepath"
+	"text/template"
+
+	"github.com/spf13/viper"
+)
+
+// GenerateFile receives data for the Go template engine and outputs the contents to the file.
+// Intended to be invoked by each language generator with appropiate data.
+func GenerateFile(funcs template.FuncMap, contents string, data types.TmplDataInterface) error {
+	contentsTmpl, err := template.New("contents").Funcs(funcs).Parse(contents)
+	if err != nil {
+		return fmt.Errorf("error initializing template: %v", err)
+	}
+
+	var buf bytes.Buffer
+	if err := contentsTmpl.Execute(&buf, data); err != nil {
+		return fmt.Errorf("error executing template: %v", err)
+	}
+	outputPath := data.BaseTmplDataInfo().OutputPath
+	if err := os.MkdirAll(filepath.Dir(outputPath), 0770); err != nil {
+		return err
+	}
+	f, err := os.Create(path.Join(outputPath))
+	if err != nil {
+		return fmt.Errorf("error creating file %q: %v", outputPath, err)
+	}
+	defer f.Close()
+	writtenBytes, err := f.Write(buf.Bytes())
+	if err != nil {
+		return fmt.Errorf("error writing contents to file %q: %v", outputPath, err)
+	}
+	if writtenBytes != buf.Len() {
+		return fmt.Errorf("error writing entire file %v: writtenBytes != expectedWrittenBytes", outputPath)
+	}
+
+	return nil
+}
+
+// Takes as input a generator and outputs file with the appropiate flag accessors.
+// The flag data is taken from the provided flag manifest.
+func CreateFlagAccessors(gen types.Generator) error {
+	bt, err := manifestutils.LoadData(viper.GetString(flagkeys.FlagManifestPath), gen.SupportedFlagTypes())
+	if err != nil {
+		return fmt.Errorf("error loading flag manifest: %v", err)
+	}
+	input := types.Input{
+		BaseData: bt,
+	}
+	return gen.Generate(input)
+}

internal/generate/manifestutils/manifestutils.go

@@ -0,0 +1,105 @@
+// Package manifestutils contains useful functions for loading the flag manifest.
+package manifestutils
+
+import (
+	flagmanifest "codegen/docs/schema/v0"
+	"codegen/internal/flagkeys"
+	"codegen/internal/generate/types"
+	"encoding/json"
+	"fmt"
+	"os"
+	"strconv"
+
+	"github.com/santhosh-tekuri/jsonschema/v5"
+	"github.com/spf13/viper"
+)
+
+// LoadData loads the data from the flag manifest.
+func LoadData(manifestPath string, supportedFlagTypes map[types.FlagType]bool) (*types.BaseTmplData, error) {
+	data, err := os.ReadFile(manifestPath)
+	if err != nil {
+		return nil, fmt.Errorf("error reading contents from file %q", manifestPath)
+	}
+	unfilteredData, err := unmarshalFlagManifest(data)
+	if err != nil {
+		return nil, err
+	}
+
+	filteredData := filterUnsupportedFlags(unfilteredData, supportedFlagTypes)
+
+	return filteredData, nil
+}
+
+func filterUnsupportedFlags(unfilteredData *types.BaseTmplData, supportedFlagTypes map[types.FlagType]bool) *types.BaseTmplData {
+	filteredData := &types.BaseTmplData{
+		OutputPath: unfilteredData.OutputPath,
+	}
+	for _, flagData := range unfilteredData.Flags {
+		if supportedFlagTypes[flagData.Type] {
+			filteredData.Flags = append(filteredData.Flags, flagData)
+		}
+	}
+	return filteredData
+}
+
+var stringToFlagType = map[string]types.FlagType{
+	"string":  types.StringType,
+	"boolean": types.BoolType,
+	"float":   types.FloatType,
+	"integer": types.IntType,
+	"object":  types.ObjectType,
+}
+
+func getDefaultValue(defaultValue interface{}, flagType types.FlagType) string {
+	switch flagType {
+	case types.BoolType:
+		return strconv.FormatBool(defaultValue.(bool))
+	case types.IntType:
+		//the conversion to float64 instead of integer typically occurs
+		//due to how JSON is parsed in Go. In Go's encoding/json package,
+		//all JSON numbers are unmarshaled into float64 by default when decoding into an interface{}.
+		return strconv.FormatFloat(defaultValue.(float64), 'g', -1, 64)
+	case types.FloatType:
+		return strconv.FormatFloat(defaultValue.(float64), 'g', -1, 64)
+	case types.StringType:
+		return defaultValue.(string)
+	default:
+		return ""
+	}
+}
+
+func unmarshalFlagManifest(data []byte) (*types.BaseTmplData, error) {
+	dynamic := make(map[string]interface{})
+	err := json.Unmarshal(data, &dynamic)
+	if err != nil {
+		return nil, fmt.Errorf("error unmarshalling JSON: %v", err)
+	}
+
+	sch, err := jsonschema.CompileString(flagmanifest.SchemaPath, flagmanifest.Schema)
+	if err != nil {
+		return nil, fmt.Errorf("error compiling JSON schema: %v", err)
+	}
+	if err = sch.Validate(dynamic); err != nil {
+		return nil, fmt.Errorf("error validating JSON schema: %v", err)
+	}
+	// All casts can be done directly since the JSON is already validated by the schema.
+	iFlags := dynamic["flags"]
+	flags := iFlags.(map[string]interface{})
+	btData := types.BaseTmplData{
+		OutputPath: viper.GetString(flagkeys.OutputPath),
+	}
+	for flagKey, iFlagData := range flags {
+		flagData := iFlagData.(map[string]interface{})
+		flagTypeString := flagData["flagType"].(string)
+		flagType := stringToFlagType[flagTypeString]
+		docs := flagData["description"].(string)
+		defaultValue := getDefaultValue(flagData["defaultValue"], flagType)
+		btData.Flags = append(btData.Flags, &types.FlagTmplData{
+			Name:         flagKey,
+			Type:         flagType,
+			DefaultValue: defaultValue,
+			Docs:         docs,
+		})
+	}
+	return &btData, nil
+}