Allow passing of env files

.vscode/launch.json

@@ -7,7 +7,7 @@
             "request": "launch",
             "mode": "auto",
             "program": "./",
-            "args": ["offline", "-file", "./samples/simple/simple-api.tf", "-module", "simple_api"]
+            "args": ["offline", "-file", "./samples/simple/simple-api.tf", "-module", "simple_api", "-envfile", "./samples/simple/.env.sample"]
         },
         {
             "name": "Attach Node",

main.go

@@ -23,8 +23,9 @@ func main() {
 					moduleName := cCtx.String("module")
 					port := cCtx.String("port")
 					nodeDebugPort := cCtx.Int("node-debug-port")
+					envFile := cCtx.String("envfile")
 
-					err := offline.Run(filePath, moduleName, port, NewDebugConfig(nodeDebugPort))
+					err := offline.Run(filePath, moduleName, port, NewDebugConfig(nodeDebugPort), envFile)
 
 					if err != nil {
 						return err
@@ -57,6 +58,12 @@ func main() {
 						Value:    "9229",
 						Usage:    "The port number that the Node.js debugger should listen on",
 					},
+					&cli.StringFlag{
+						Name:     "envfile",
+						Required: false,
+						Value:    "",
+						Usage:    "File containing environment variables in key-value (.env) format",
+					},
 				},
 			},
 		},

offline/offline.go

@@ -1,6 +1,7 @@
 package offline
 
 import (
+	"bufio"
 	"errors"
 	"fmt"
 	"log"
@@ -19,7 +20,7 @@ import (
 
 var DebugConfig config.DebugConfig
 
-func Run(filePath string, moduleName string, port string, debugConfig config.DebugConfig) error {
+func Run(filePath string, moduleName string, port string, debugConfig config.DebugConfig, envFile string) error {
 	DebugConfig = debugConfig
 	terrableConfig, err := utils.ParseTerraformFile(filePath, moduleName)
 
@@ -46,6 +47,15 @@ func Run(filePath string, moduleName string, port string, debugConfig config.Deb
 	var wg sync.WaitGroup
 	defer wg.Wait()
 
+	// Read environment variables from the specified env file (if provided)
+	var fileEnvVars map[string]string
+	if envFile != "" {
+		fileEnvVars, err = readEnvFile(envFile)
+		if err != nil {
+			return fmt.Errorf("could not read env file: %w", err)
+		}
+	}
+
 	r := mux.NewRouter()
 
 	// Not Found handlers
@@ -70,7 +80,7 @@ func Run(filePath string, moduleName string, port string, debugConfig config.Deb
 
 			ServeHandler(&HandlerInstance{
 				handlerConfig: handler,
-				envVars:       mergeEnvMaps(terrableConfig.GlobalEnvironmentVariables, handler.EnvironmentVariables),
+				envVars:       mergeEnvMaps(terrableConfig.GlobalEnvironmentVariables, mergeEnvMaps(handler.EnvironmentVariables, fileEnvVars)),
 			}, r)
 		}(handler)
 	}
@@ -224,3 +234,33 @@ func mergeEnvMaps(global, local map[string]string) map[string]string {
 
 	return merged
 }
+
+func readEnvFile(filePath string) (map[string]string, error) {
+	envVars := make(map[string]string)
+
+	file, err := os.Open(filePath)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		line := scanner.Text()
+		if strings.TrimSpace(line) == "" || strings.HasPrefix(line, "#") {
+			continue
+		}
+		parts := strings.SplitN(line, "=", 2)
+		if len(parts) == 2 {
+			key := strings.TrimSpace(parts[0])
+			value := strings.TrimSpace(parts[1])
+			envVars[key] = value
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		return nil, err
+	}
+
+	return envVars, nil
+}

samples/simple/.env.sample

@@ -0,0 +1,2 @@
+ENV_FILE_VAL=value-from-env-file
+ENV_FILE_OVERRIDE=overridden-value

samples/simple/simple-api.tf

@@ -46,6 +46,18 @@ module "simple_api" {
         }
     },
 
+    # Echo Handler with some variables that should be overwritten by the .env file
+    EchoEnvTest: {
+        source = "./src/Echo.ts"
+        environment_variables = {
+          ENV_FILE_OVERRIDE = "SHOULD_NOT_ECHO"
+        }
+        http = {
+          GET = "/echo-env-test"
+        }
+    },
+
+
     # Echo Handler with no local environment variables
     EchoHandlerNoLocalEnv: {
         source = "./src/Echo.ts"

terrable_build

@@ -1 +1 @@
-version = 0.9.0
+version = 0.10.0

tests/_start.sh

@@ -1,2 +1,2 @@
 go build ../
-./terrable offline -f "../samples/simple/simple-api.tf" -m "simple_api" -p "8081"
+./terrable offline -f "../samples/simple/simple-api.tf" -m "simple_api" -p "8081" -envfile "../samples/simple/.env.sample"

tests/requests/env_file_overrides.hurl

@@ -0,0 +1,6 @@
+GET http://127.0.0.1:8081/echo-env-test
+HTTP 200
+
+[Asserts]
+jsonpath "$.env.ENV_FILE_VAL" == "value-from-env-file"
+jsonpath "$.env.ENV_FILE_OVERRIDE" == "overridden-value"