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// Copyright (C) MongoDB, Inc. 2023-present.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
package driverutil
import (
"os"
"strings"
)
const AwsLambdaPrefix = "AWS_Lambda_"
const (
// FaaS environment variable names
// EnvVarAWSExecutionEnv is the AWS Execution environment variable.
EnvVarAWSExecutionEnv = "AWS_EXECUTION_ENV"
// EnvVarAWSLambdaRuntimeAPI is the AWS Lambda runtime API variable.
EnvVarAWSLambdaRuntimeAPI = "AWS_LAMBDA_RUNTIME_API"
// EnvVarFunctionsWorkerRuntime is the functions worker runtime variable.
EnvVarFunctionsWorkerRuntime = "FUNCTIONS_WORKER_RUNTIME"
// EnvVarKService is the K Service variable.
EnvVarKService = "K_SERVICE"
// EnvVarFunctionName is the function name variable.
EnvVarFunctionName = "FUNCTION_NAME"
// EnvVarVercel is the Vercel variable.
EnvVarVercel = "VERCEL"
// EnvVarK8s is the K8s variable.
EnvVarK8s = "KUBERNETES_SERVICE_HOST"
)
const (
// FaaS environment variable names
// EnvVarAWSRegion is the AWS region variable.
EnvVarAWSRegion = "AWS_REGION"
// EnvVarAWSLambdaFunctionMemorySize is the AWS Lambda function memory size variable.
EnvVarAWSLambdaFunctionMemorySize = "AWS_LAMBDA_FUNCTION_MEMORY_SIZE"
// EnvVarFunctionMemoryMB is the function memory in megabytes variable.
EnvVarFunctionMemoryMB = "FUNCTION_MEMORY_MB"
// EnvVarFunctionTimeoutSec is the function timeout in seconds variable.
EnvVarFunctionTimeoutSec = "FUNCTION_TIMEOUT_SEC"
// EnvVarFunctionRegion is the function region variable.
EnvVarFunctionRegion = "FUNCTION_REGION"
// EnvVarVercelRegion is the Vercel region variable.
EnvVarVercelRegion = "VERCEL_REGION"
)
const (
// FaaS environment names used by the client
// EnvNameAWSLambda is the AWS Lambda environment name.
EnvNameAWSLambda = "aws.lambda"
// EnvNameAzureFunc is the Azure Function environment name.
EnvNameAzureFunc = "azure.func"
// EnvNameGCPFunc is the Google Cloud Function environment name.
EnvNameGCPFunc = "gcp.func"
// EnvNameVercel is the Vercel environment name.
EnvNameVercel = "vercel"
)
// GetFaasEnvName parses the FaaS environment variable name and returns the
// corresponding name used by the client. If none of the variables or variables
// for multiple names are populated the client.env value MUST be entirely
// omitted. When variables for multiple "client.env.name" values are present,
// "vercel" takes precedence over "aws.lambda"; any other combination MUST cause
// "client.env" to be entirely omitted.
func GetFaasEnvName() string {
envVars := []string{
EnvVarAWSExecutionEnv,
EnvVarAWSLambdaRuntimeAPI,
EnvVarFunctionsWorkerRuntime,
EnvVarKService,
EnvVarFunctionName,
EnvVarVercel,
}
// If none of the variables are populated the client.env value MUST be
// entirely omitted.
names := make(map[string]struct{})
for _, envVar := range envVars {
val := os.Getenv(envVar)
if val == "" {
continue
}
var name string
switch envVar {
case EnvVarAWSExecutionEnv:
if !strings.HasPrefix(val, AwsLambdaPrefix) {
continue
}
name = EnvNameAWSLambda
case EnvVarAWSLambdaRuntimeAPI:
name = EnvNameAWSLambda
case EnvVarFunctionsWorkerRuntime:
name = EnvNameAzureFunc
case EnvVarKService, EnvVarFunctionName:
name = EnvNameGCPFunc
case EnvVarVercel:
// "vercel" takes precedence over "aws.lambda".
delete(names, EnvNameAWSLambda)
name = EnvNameVercel
}
names[name] = struct{}{}
if len(names) > 1 {
// If multiple names are populated the client.env value
// MUST be entirely omitted.
names = nil
break
}
}
for name := range names {
return name
}
return ""
}