properly expand env vars in config items defined as lists

Author: karimra

pkg/config/actions.go

@@ -40,10 +40,11 @@ func (c *Config) GetActions() (map[string]map[string]interface{}, error) {
 	}
 	for n := range c.Actions {
 		expandMapEnv(c.Actions[n],
-			"target", "paths", "values", // gnmi action templates
-			"url", "body", // http action templates
-			"template", // template action templates
-		)
+			expandExcept(
+				"target", "paths", "values", // gnmi action templates
+				"url", "body", // http action templates
+				"template", // template action templates
+			))
 	}
 	if c.Debug {
 		c.logger.Printf("actions: %+v", c.Actions)

pkg/config/environment.go

@@ -78,20 +78,54 @@ func (c *Config) SetGlobalsFromEnv(cmd *cobra.Command) {
 	})
 }
 
-func expandMapEnv(m map[string]interface{}, except ...string) {
-OUTER:
+func expandMapEnv(m map[string]interface{}, fn func(string, string) string) {
 	for f := range m {
 		switch v := m[f].(type) {
 		case string:
-			for _, e := range except {
-				if f == e {
-					continue OUTER
+			m[f] = fn(f, v)
+		case map[string]interface{}:
+			expandMapEnv(v, fn)
+			m[f] = v
+		case []any:
+			for i, item := range v {
+				switch item := item.(type) {
+				case string:
+					v[i] = os.ExpandEnv(item)
+				case map[string]interface{}:
+					expandMapEnv(item, fn)
+				case []any:
+					expandSliceEnv(item, fn)
 				}
 			}
-			m[f] = os.ExpandEnv(v)
-		case map[string]interface{}:
-			expandMapEnv(v, except...)
 			m[f] = v
 		}
 	}
 }
+
+func expandSliceEnv(s []any, fn func(string, string) string) {
+	for i, item := range s {
+		switch item := item.(type) {
+		case string:
+			s[i] = os.ExpandEnv(item)
+		case map[string]interface{}:
+			expandMapEnv(item, fn)
+		case []any:
+			expandSliceEnv(item, fn)
+		}
+	}
+}
+
+func expandExcept(except ...string) func(string, string) string {
+	return func(k, v string) string {
+		for _, e := range except {
+			if k == e {
+				return v
+			}
+		}
+		return os.ExpandEnv(v)
+	}
+}
+
+func expandAll() func(string, string) string {
+	return expandExcept()
+}

pkg/config/inputs.go

@@ -51,7 +51,7 @@ func (c *Config) GetInputs() (map[string]map[string]interface{}, error) {
 		return nil, fmt.Errorf("there was %d error(s) when getting inputs configuration", len(errs))
 	}
 	for n := range c.Inputs {
-		expandMapEnv(c.Inputs[n])
+		expandMapEnv(c.Inputs[n], expandAll())
 	}
 	if c.Debug {
 		c.logger.Printf("inputs: %+v", c.Inputs)

pkg/config/loader.go

@@ -11,6 +11,8 @@ package config
 import (
 	"errors"
 	"fmt"
+	"os"
+	"strings"
 
 	"github.com/openconfig/gnmic/pkg/loaders"
 	_ "github.com/openconfig/gnmic/pkg/loaders/all"
@@ -39,12 +41,20 @@ func (c *Config) GetLoader() error {
 	if lds, ok := c.Loader["type"].(string); ok {
 		for _, lt := range loaders.LoadersTypes {
 			if lt == lds {
-				expandMapEnv(c.Loader)
+				expandMapEnv(c.Loader, func(k, v string) string {
+					if k == "password" {
+						if strings.HasPrefix(v, "${") && strings.HasSuffix(v, "}") {
+							return os.ExpandEnv(v)
+						}
+						return v
+					}
+					return os.ExpandEnv(v)
+				})
+				fmt.Printf("LOADER: %+v\n", c.Loader)
 				return nil
 			}
 		}
 		return fmt.Errorf("unknown loader type %q", lds)
 	}
 	return fmt.Errorf("field 'type' not a string, found a %T", c.Loader["type"])
-
 }

pkg/config/locker.go

@@ -32,7 +32,7 @@ func (c *Config) getLocker() error {
 		default:
 			return errors.New("wrong locker type format")
 		}
-		expandMapEnv(c.Clustering.Locker)
+		expandMapEnv(c.Clustering.Locker, expandAll())
 		return nil
 	}
 	return errors.New("missing locker type")

pkg/config/outputs.go

@@ -53,7 +53,7 @@ func (c *Config) GetOutputs() (map[string]map[string]interface{}, error) {
 		}
 	}
 	for n := range c.Outputs {
-		expandMapEnv(c.Outputs[n], "msg-template", "target-template")
+		expandMapEnv(c.Outputs[n], expandExcept("msg-template", "target-template"))
 	}
 	namedOutputs := c.FileConfig.GetStringSlice("subscribe-output")
 	if len(namedOutputs) == 0 {

pkg/config/processors.go

@@ -39,7 +39,7 @@ func (c *Config) GetEventProcessors() (map[string]map[string]interface{}, error)
 		c.Processors[n] = es
 	}
 	for n := range c.Processors {
-		expandMapEnv(c.Processors[n], "expression", "condition")
+		expandMapEnv(c.Processors[n], expandExcept("expression", "condition"))
 	}
 	if c.Debug {
 		c.logger.Printf("processors: %+v", c.Processors)