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envconfig.go
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envconfig.go
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package engine
import (
"os"
"path/filepath"
"strconv"
"strings"
"github.com/project-flogo/core/app/propertyresolver"
"github.com/project-flogo/core/data/property"
"github.com/project-flogo/core/engine/runner"
"github.com/project-flogo/core/support/log"
)
const (
EnvKeyAppConfigLocation = "FLOGO_CONFIG_PATH"
DefaultAppConfigLocation = "flogo.json"
EnvKeyEngineConfigLocation = "FLOGO_ENG_CONFIG_PATH"
DefaultEngineConfigLocation = "engine.json"
EnvKeyStopEngineOnError = "FLOGO_ENGINE_STOP_ON_ERROR"
DefaultStopEngineOnError = true
EnvKeyRunnerType = "FLOGO_RUNNER_TYPE"
DefaultRunnerType = ValueRunnerTypePooled
EnvKeyRunnerWorkers = "FLOGO_RUNNER_WORKERS"
DefaultRunnerWorkers = 5
//Deprecated
EnvKeyRunnerQueueSizeLegacy = "FLOGO_RUNNER_QUEUE"
EnvKeyRunnerQueueSize = "FLOGO_RUNNER_QUEUE_SIZE"
DefaultRunnerQueueSize = 50
EnvAppPropertyResolvers = "FLOGO_APP_PROP_RESOLVERS"
EnvEnableSchemaSupport = "FLOGO_SCHEMA_SUPPORT"
EnvEnableSchemaValidation = "FLOGO_SCHEMA_VALIDATION"
ValueRunnerTypePooled = "POOLED"
ValueRunnerTypeDirect = "DIRECT"
)
func IsSchemaSupportEnabled() bool {
schemaValidationEnv := os.Getenv(EnvEnableSchemaSupport)
if strings.EqualFold(schemaValidationEnv, "true") {
return true
}
return false
}
func IsSchemaValidationEnabled() bool {
schemaValidationEnv := os.Getenv(EnvEnableSchemaValidation)
if !strings.EqualFold(schemaValidationEnv, "true") {
return false
}
return true
}
// GetFlogoAppConfigPath returns the flogo config path
func GetFlogoAppConfigPath() string {
flogoConfigPathEnv := os.Getenv(EnvKeyAppConfigLocation)
if len(flogoConfigPathEnv) > 0 {
return flogoConfigPathEnv
}
if _, err := os.Stat(DefaultAppConfigLocation); err != nil {
upDirConfig := filepath.Join("..", DefaultAppConfigLocation)
if _, err := os.Stat(upDirConfig); err == nil {
return upDirConfig
}
}
return DefaultAppConfigLocation
}
// GetFlogoEngineConfigPath returns the flogo engine config path
func GetFlogoEngineConfigPath() string {
flogoConfigPathEnv := os.Getenv(EnvKeyEngineConfigLocation)
if len(flogoConfigPathEnv) > 0 {
return flogoConfigPathEnv
}
if _, err := os.Stat(DefaultEngineConfigLocation); err != nil {
upDirConfig := filepath.Join("..", DefaultEngineConfigLocation)
if _, err := os.Stat(upDirConfig); err == nil {
return upDirConfig
}
}
return DefaultEngineConfigLocation
}
//func SetDefaultLogLevel(logLevel string) {
// defaultLogLevel = logLevel
//}
//
////GetLogLevel returns the log level
//func GetLogLevel() string {
// logLevelEnv := os.Getenv(EnvKeyLogLevel)
// if len(logLevelEnv) > 0 {
// return logLevelEnv
// }
// return defaultLogLevel
//}
//
//func GetLogDateTimeFormat() string {
// logLevelEnv := os.Getenv(EnvKeyLogDateFormat)
// if len(logLevelEnv) > 0 {
// return logLevelEnv
// }
// return DefaultLogDateFormat
//}
func StopEngineOnError() bool {
stopEngineOnError := os.Getenv(EnvKeyStopEngineOnError)
if len(stopEngineOnError) == 0 {
return DefaultStopEngineOnError
}
b, _ := strconv.ParseBool(stopEngineOnError)
return b
}
func displayAppPropertyValueResolversHelp(logger log.Logger, resolvers []string) {
logger.Warn("Multiple property resolvers where defined without setting a priority order!")
logger.Infof("Set environment variable '%s' with a comma-separated list of resolvers to use (definition order is decreasing order of priority)", EnvAppPropertyResolvers)
logger.Infof("List of available resolvers: %v", resolvers)
logger.Warn("No property resolver will be used")
}
func GetAppPropertyValueResolvers(logger log.Logger) string {
key := os.Getenv(EnvAppPropertyResolvers)
if len(key) > 0 {
if key == "disabled" {
return ""
}
return key
}
// EnvAppPropertyResolvers is not set, let's guess some convenient default behaviours
switch len(property.RegisteredResolvers) {
case 0: // no resolver, do nothing
return ""
case 1: // only one resolver has been registered, use it
for resolver := range property.RegisteredResolvers {
return resolver
}
case 2, 3:
var resolvers, builtinResolvers []string
for resolver := range property.RegisteredResolvers {
if resolver != propertyresolver.ResolverNameEnv && resolver != propertyresolver.ResolverNameJson {
resolvers = append(resolvers, resolver)
} else {
builtinResolvers = append(builtinResolvers, resolver)
}
}
if len(resolvers) > 1 { // multiple (excluding builtin) resolvers defined, do nothing and hint to enforce an order
resolvers = append(resolvers, builtinResolvers...)
displayAppPropertyValueResolversHelp(logger, resolvers)
return ""
}
if len(builtinResolvers) == 2 { // force priority between the two builtin resolvers
builtinResolvers = []string{propertyresolver.ResolverNameEnv, propertyresolver.ResolverNameJson}
}
resolvers = append(resolvers, builtinResolvers...)
return strings.Join(resolvers[:], ",")
default: // multiple (excluding builtin) resolvers defined, do nothing and hint to enforce an order
var resolvers []string
for resolver := range property.RegisteredResolvers {
resolvers = append(resolvers, resolver)
}
displayAppPropertyValueResolversHelp(logger, resolvers)
return ""
}
return ""
}
// GetRunnerType returns the runner type
func GetRunnerType() string {
runnerTypeEnv := os.Getenv(EnvKeyRunnerType)
if len(runnerTypeEnv) > 0 {
return runnerTypeEnv
}
return DefaultRunnerType
}
// GetRunnerWorkers returns the number of workers to use
func GetRunnerWorkers() int {
numWorkers := DefaultRunnerWorkers
workersEnv := os.Getenv(EnvKeyRunnerWorkers)
if len(workersEnv) > 0 {
i, err := strconv.Atoi(workersEnv)
if err == nil {
numWorkers = i
}
}
return numWorkers
}
// GetRunnerQueueSize returns the runner queue size
func GetRunnerQueueSize() int {
queueSize := DefaultRunnerQueueSize
queueSizeEnv := os.Getenv(EnvKeyRunnerQueueSize)
if len(queueSizeEnv) > 0 {
i, err := strconv.Atoi(queueSizeEnv)
if err == nil {
queueSize = i
}
} else {
//For backward compatible.
legacyQueueSize := os.Getenv(EnvKeyRunnerQueueSizeLegacy)
if len(legacyQueueSize) > 0 {
i, err := strconv.Atoi(legacyQueueSize)
if err == nil {
queueSize = i
}
}
}
return queueSize
}
// NewPooledRunnerConfig creates a new Pooled config, looks for environment variables to override default values
func NewPooledRunnerConfig() *runner.PooledConfig {
return &runner.PooledConfig{NumWorkers: GetRunnerWorkers(), WorkQueueSize: GetRunnerQueueSize()}
}
func ConfigViaEnv(e *engineImpl) {
config := &Config{}
//config.LogLevel = GetLogLevel()
config.RunnerType = GetRunnerType()
config.StopEngineOnError = StopEngineOnError()
e.config = config
}
func DirectRunner(e *engineImpl) error {
e.logger.Debugf("Using 'DIRECT' Action Runner")
e.actionRunner = runner.NewDirect()
return nil
}