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config.go
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config.go
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package config
import (
"fmt"
"log"
"strings"
"github.com/knadh/koanf"
"github.com/knadh/koanf/parsers/yaml"
"github.com/knadh/koanf/providers/confmap"
"github.com/knadh/koanf/providers/env"
"github.com/knadh/koanf/providers/file"
)
type IConfig interface {
LoadDefaults()
LoadPluginEnvVars()
LoadGlobalEnvVars()
LoadGlobalConfigFile()
LoadPluginConfigFile()
MergeGlobalConfig(map[string]interface{})
}
type Config struct {
globalDefaults map[string]interface{}
pluginDefaults map[string]interface{}
globalConfigFile string
pluginConfigFile string
GlobalKoanf *koanf.Koanf
PluginKoanf *koanf.Koanf
Global GlobalConfig
Plugin PluginConfig
}
var _ IConfig = &Config{}
func NewConfig(globalConfigFile, pluginConfigFile string) *Config {
config := Config{
GlobalKoanf: koanf.New("."),
PluginKoanf: koanf.New("."),
globalDefaults: make(map[string]interface{}),
pluginDefaults: make(map[string]interface{}),
globalConfigFile: globalConfigFile,
pluginConfigFile: pluginConfigFile,
}
config.LoadDefaults()
config.LoadPluginConfigFile()
config.LoadPluginEnvVars()
config.UnmarshalPluginConfig()
config.LoadGlobalConfigFile()
config.LoadGlobalEnvVars()
config.UnmarshalGlobalConfig()
return &config
}
// LoadDefaults loads the default configuration before loading the config files.
func (c *Config) LoadDefaults() {
c.globalDefaults = map[string]interface{}{
"loggers": map[string]interface{}{
"default": map[string]interface{}{
"output": DefaultLogOutput,
"level": DefaultLogLevel,
"timeFormat": DefaultTimeFormat,
"consoleTimeFormat": DefaultConsoleTimeFormat,
"fileName": DefaultLogFileName,
"maxSize": DefaultMaxSize,
"maxBackups": DefaultMaxBackups,
"maxAge": DefaultMaxAge,
"compress": DefaultCompress,
"localTime": DefaultLocalTime,
"rsyslogNetwork": DefaultRSyslogNetwork,
"rsyslogAddress": DefaultRSyslogAddress,
"syslogPriority": DefaultSyslogPriority,
},
},
"clients": map[string]interface{}{
"default": map[string]interface{}{
"receiveBufferSize": DefaultBufferSize,
"receiveChunkSize": DefaultChunkSize,
"tcpKeepAlivePeriod": DefaultTCPKeepAlivePeriod.String(),
},
},
"pools": map[string]interface{}{
"default": map[string]interface{}{
"size": DefaultPoolSize,
},
},
"proxy": map[string]interface{}{
"default": map[string]interface{}{
"elastic": false,
"reuseElasticClients": false,
"healthCheckPeriod": DefaultHealthCheckPeriod.String(),
},
},
"servers": map[string]interface{}{
"default": map[string]interface{}{
"network": DefaultListenNetwork,
"address": DefaultListenAddress,
"softLimit": 0,
"hardLimit": 0,
"enableTicker": false,
"multiCore": true,
"lockOSThread": false,
"reuseAddress": true,
"reusePort": true,
"loadBalancer": DefaultLoadBalancer,
"readBufferCap": DefaultBufferSize,
"writeBufferCap": DefaultBufferSize,
"socketRecvBuffer": DefaultBufferSize,
"socketSendBuffer": DefaultBufferSize,
},
},
"metrics": map[string]interface{}{
"default": map[string]interface{}{
"enabled": true,
"address": DefaultMetricsAddress,
"path": DefaultMetricsPath,
},
},
}
c.pluginDefaults = map[string]interface{}{
"plugins": map[string]interface{}{
"verificationPolicy": "passdown",
"compatibilityPolicy": "strict",
"acceptancePolicy": "accept",
"metricsMergerPeriod": DefaultMetricsMergerPeriod.String(),
"healthCheckPeriod": DefaultPluginHealthCheckPeriod.String(),
},
}
if err := c.GlobalKoanf.Load(confmap.Provider(c.globalDefaults, ""), nil); err != nil {
log.Fatal(fmt.Errorf("failed to load default global configuration: %w", err))
}
if err := c.PluginKoanf.Load(confmap.Provider(c.pluginDefaults, ""), nil); err != nil {
log.Fatal(fmt.Errorf("failed to load default plugin configuration: %w", err))
}
}
// LoadGlobalEnvVars loads the environment variables into the global configuration with the
// given prefix, "GATEWAYD_".
func (c *Config) LoadGlobalEnvVars() {
if err := c.GlobalKoanf.Load(loadEnvVars(), nil); err != nil {
log.Fatal(fmt.Errorf("failed to load environment variables: %w", err))
}
}
// LoadPluginEnvVars loads the environment variables into the plugins configuration with the
// given prefix, "GATEWAYD_".
func (c *Config) LoadPluginEnvVars() {
if err := c.PluginKoanf.Load(loadEnvVars(), nil); err != nil {
log.Fatal(fmt.Errorf("failed to load environment variables: %w", err))
}
}
func loadEnvVars() *env.Env {
return env.Provider(EnvPrefix, ".", func(env string) string {
return strings.ReplaceAll(strings.ToLower(strings.TrimPrefix(env, EnvPrefix)), "_", ".")
})
}
// LoadGlobalConfig loads the plugin configuration file.
func (c *Config) LoadGlobalConfigFile() {
if err := c.GlobalKoanf.Load(file.Provider(c.globalConfigFile), yaml.Parser()); err != nil {
log.Fatal(fmt.Errorf("failed to load global configuration: %w", err))
}
}
// LoadPluginConfig loads the plugin configuration file.
func (c *Config) LoadPluginConfigFile() {
if err := c.PluginKoanf.Load(file.Provider(c.pluginConfigFile), yaml.Parser()); err != nil {
log.Fatal(fmt.Errorf("failed to load plugin configuration: %w", err))
}
}
// UnmarshalGlobalConfig unmarshals the global configuration for easier access.
func (c *Config) UnmarshalGlobalConfig() {
if err := c.GlobalKoanf.Unmarshal("", &c.Global); err != nil {
log.Fatal(fmt.Errorf("failed to unmarshal global configuration: %w", err))
}
}
// UnmarshalPluginConfig unmarshals the plugin configuration for easier access.
func (c *Config) UnmarshalPluginConfig() {
if err := c.PluginKoanf.Unmarshal("", &c.Plugin); err != nil {
log.Fatal(fmt.Errorf("failed to unmarshal plugin configuration: %w", err))
}
}
func (c *Config) MergeGlobalConfig(updatedGlobalConfig map[string]interface{}) {
if err := c.GlobalKoanf.Load(confmap.Provider(updatedGlobalConfig, "."), nil); err != nil {
log.Fatal(fmt.Errorf("failed to merge global configuration: %w", err))
}
if err := c.GlobalKoanf.Unmarshal("", &c.Global); err != nil {
log.Fatal(fmt.Errorf("failed to unmarshal global configuration: %w", err))
}
}