feat: update golang output (#63)

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

- updates the golang output for the flag accessors

---------

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/testdata/success_go.golden

@@ -1,3 +1,4 @@
+// AUTOMATICALLY GENERATED BY OPENFEATURE CODEGEN, DO NOT EDIT.
 package testpackage
 
 import (
@@ -5,45 +6,85 @@ import (
 	"github.com/open-feature/go-sdk/openfeature"
 )
 
-type BooleanProvider func(ctx context.Context) (bool, error)
+type BooleanProvider func(ctx context.Context, evalCtx openfeature.EvaluationContext) (bool, error)
-type FloatProvider func(ctx context.Context) (float64, error)
+type BooleanProviderDetails func(ctx context.Context, evalCtx openfeature.EvaluationContext) (openfeature.BooleanEvaluationDetails, error)
-type IntProvider func(ctx context.Context) (int64, error)
+type FloatProvider func(ctx context.Context, evalCtx openfeature.EvaluationContext) (float64, error)
-type StringProvider func(ctx context.Context) (string, error)
+type FloatProviderDetails func(ctx context.Context, evalCtx openfeature.EvaluationContext) (openfeature.FloatEvaluationDetails, error)
+type IntProvider func(ctx context.Context, evalCtx openfeature.EvaluationContext) (int64, error)
+type IntProviderDetails func(ctx context.Context, evalCtx openfeature.EvaluationContext) (openfeature.IntEvaluationDetails, error)
+type StringProvider func(ctx context.Context, evalCtx openfeature.EvaluationContext) (string, error)
+type StringProviderDetails func(ctx context.Context, evalCtx openfeature.EvaluationContext) (openfeature.StringEvaluationDetails, error)
 
-var client *openfeature.Client = nil
+var client openfeature.IClient = nil
 // Discount percentage applied to purchases.
 var DiscountPercentage = struct {
+    // Value returns the value of the flag DiscountPercentage,
+    // as well as the evaluation error, if present.
     Value FloatProvider
+
+    // ValueWithDetails returns the value of the flag DiscountPercentage,
+    // the evaluation error, if any, and the evaluation details.
+    ValueWithDetails FloatProviderDetails
 }{
-    Value: func(ctx context.Context) (float64, error) {
+    Value: func(ctx context.Context, evalCtx openfeature.EvaluationContext) (float64, error) {
-        return client.FloatValue(ctx, "discountPercentage", 0.15, openfeature.EvaluationContext{})
+        return client.FloatValue(ctx, "discountPercentage", 0.15, evalCtx)
+    },
+    ValueWithDetails: func(ctx context.Context, evalCtx openfeature.EvaluationContext) (openfeature.FloatEvaluationDetails, error){
+        return client.FloatValueDetails(ctx, "discountPercentage", 0.15, evalCtx)
     },
 }
 // Controls whether Feature A is enabled.
 var EnableFeatureA = struct {
+    // Value returns the value of the flag EnableFeatureA,
+    // as well as the evaluation error, if present.
     Value BooleanProvider
+
+    // ValueWithDetails returns the value of the flag EnableFeatureA,
+    // the evaluation error, if any, and the evaluation details.
+    ValueWithDetails BooleanProviderDetails
 }{
-    Value: func(ctx context.Context) (bool, error) {
+    Value: func(ctx context.Context, evalCtx openfeature.EvaluationContext) (bool, error) {
-        return client.BooleanValue(ctx, "enableFeatureA", false, openfeature.EvaluationContext{})
+        return client.BooleanValue(ctx, "enableFeatureA", false, evalCtx)
+    },
+    ValueWithDetails: func(ctx context.Context, evalCtx openfeature.EvaluationContext) (openfeature.BooleanEvaluationDetails, error){
+        return client.BooleanValueDetails(ctx, "enableFeatureA", false, evalCtx)
     },
 }
 // The message to use for greeting users.
 var GreetingMessage = struct {
+    // Value returns the value of the flag GreetingMessage,
+    // as well as the evaluation error, if present.
     Value StringProvider
+
+    // ValueWithDetails returns the value of the flag GreetingMessage,
+    // the evaluation error, if any, and the evaluation details.
+    ValueWithDetails StringProviderDetails
 }{
-    Value: func(ctx context.Context) (string, error) {
+    Value: func(ctx context.Context, evalCtx openfeature.EvaluationContext) (string, error) {
-        return client.StringValue(ctx, "greetingMessage", "Hello there!", openfeature.EvaluationContext{})
+        return client.StringValue(ctx, "greetingMessage", "Hello there!", evalCtx)
+    },
+    ValueWithDetails: func(ctx context.Context, evalCtx openfeature.EvaluationContext) (openfeature.StringEvaluationDetails, error){
+        return client.StringValueDetails(ctx, "greetingMessage", "Hello there!", evalCtx)
     },
 }
 // Maximum allowed length for usernames.
 var UsernameMaxLength = struct {
+    // Value returns the value of the flag UsernameMaxLength,
+    // as well as the evaluation error, if present.
     Value IntProvider
+
+    // ValueWithDetails returns the value of the flag UsernameMaxLength,
+    // the evaluation error, if any, and the evaluation details.
+    ValueWithDetails IntProviderDetails
 }{
-    Value: func(ctx context.Context) (int64, error) {
+    Value: func(ctx context.Context, evalCtx openfeature.EvaluationContext) (int64, error) {
-        return client.IntValue(ctx, "usernameMaxLength", 50, openfeature.EvaluationContext{})
+        return client.IntValue(ctx, "usernameMaxLength", 50, evalCtx)
+    },
+    ValueWithDetails: func(ctx context.Context, evalCtx openfeature.EvaluationContext) (openfeature.IntEvaluationDetails, error){
+        return client.IntValueDetails(ctx, "usernameMaxLength", 50, evalCtx)
     },
 }
 
 func init() {
-	client = openfeature.NewClient("testpackage")
+	client = openfeature.GetApiInstance().GetClient()
 }

internal/generate/plugins/golang/golang.go

@@ -53,32 +53,16 @@ func flagInitParam(flagName string) string {
 	return strconv.Quote(flagName)
 }
 
-// flagVarType returns the Go type for a flag's proto definition.
+func openFeatureType(t types.FlagType) string {
-func providerType(t types.FlagType) string {
 	switch t {
 	case types.IntType:
-		return "IntProvider"
+		return "Int"
 	case types.FloatType:
-		return "FloatProvider"
+		return "Float"
 	case types.BoolType:
-		return "BooleanProvider"
+		return "Boolean"
 	case types.StringType:
-		return "StringProvider"
+		return "String"
-	default:
-		return ""
-	}
-}
-
-func flagAccessFunc(t types.FlagType) string {
-	switch t {
-	case types.IntType:
-		return "IntValue"
-	case types.FloatType:
-		return "FloatValue"
-	case types.BoolType:
-		return "BooleanValue"
-	case types.StringType:
-		return "StringValue"
 	default:
 		return ""
 	}
@@ -125,8 +109,7 @@ func (g *genImpl) Generate(input types.Input) error {
 	funcs := template.FuncMap{
 		"FlagVarName":         flagVarName,
 		"FlagInitParam":       flagInitParam,
-		"ProviderType":        providerType,
+		"OpenFeatureType":     openFeatureType,
-		"FlagAccessFunc":      flagAccessFunc,
 		"SupportImports":      supportImports,
 		"DefaultValueLiteral": defaultValueLiteral,
 		"TypeString":          typeString,

internal/generate/plugins/golang/golang.tmpl

@@ -1,3 +1,4 @@
+// AUTOMATICALLY GENERATED BY OPENFEATURE CODEGEN, DO NOT EDIT.
 package {{.GoPackage}}
 
 import (
@@ -6,25 +7,38 @@ import (
 {{- end}}
 )
 
-type BooleanProvider func(ctx context.Context) (bool, error)
+type BooleanProvider func(ctx context.Context, evalCtx openfeature.EvaluationContext) (bool, error)
-type FloatProvider func(ctx context.Context) (float64, error)
+type BooleanProviderDetails func(ctx context.Context, evalCtx openfeature.EvaluationContext) (openfeature.BooleanEvaluationDetails, error)
-type IntProvider func(ctx context.Context) (int64, error)
+type FloatProvider func(ctx context.Context, evalCtx openfeature.EvaluationContext) (float64, error)
-type StringProvider func(ctx context.Context) (string, error)
+type FloatProviderDetails func(ctx context.Context, evalCtx openfeature.EvaluationContext) (openfeature.FloatEvaluationDetails, error)
+type IntProvider func(ctx context.Context, evalCtx openfeature.EvaluationContext) (int64, error)
+type IntProviderDetails func(ctx context.Context, evalCtx openfeature.EvaluationContext) (openfeature.IntEvaluationDetails, error)
+type StringProvider func(ctx context.Context, evalCtx openfeature.EvaluationContext) (string, error)
+type StringProviderDetails func(ctx context.Context, evalCtx openfeature.EvaluationContext) (openfeature.StringEvaluationDetails, error)
 
-var client *openfeature.Client = nil
+var client openfeature.IClient = nil
 
 
 {{- range .Flags}}
 // {{.Docs}}
 var {{FlagVarName .Name}} = struct {
-    Value {{ProviderType .Type}}
+    // Value returns the value of the flag {{FlagVarName .Name}},
+    // as well as the evaluation error, if present.
+    Value {{OpenFeatureType .Type}}Provider
+
+    // ValueWithDetails returns the value of the flag {{FlagVarName .Name}},
+    // the evaluation error, if any, and the evaluation details.
+    ValueWithDetails {{OpenFeatureType .Type}}ProviderDetails
 }{
-    Value: func(ctx context.Context) ({{TypeString .Type}}, error) {
+    Value: func(ctx context.Context, evalCtx openfeature.EvaluationContext) ({{TypeString .Type}}, error) {
-        return client.{{FlagAccessFunc .Type}}(ctx, {{FlagInitParam .Name}}, {{DefaultValueLiteral .}}, openfeature.EvaluationContext{})
+        return client.{{OpenFeatureType .Type}}Value(ctx, {{FlagInitParam .Name}}, {{DefaultValueLiteral .}}, evalCtx)
+    },
+    ValueWithDetails: func(ctx context.Context, evalCtx openfeature.EvaluationContext) (openfeature.{{OpenFeatureType .Type}}EvaluationDetails, error){
+        return client.{{OpenFeatureType .Type}}ValueDetails(ctx, {{FlagInitParam .Name}}, {{DefaultValueLiteral .}}, evalCtx)
     },
 }
 {{- end}}
 
 func init() {
-	client = openfeature.NewClient("{{.GoPackage}}")
+	client = openfeature.GetApiInstance().GetClient()
 }