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package log
import (
"fmt"
"os"
)
// Config keys.
const (
ckFormat = "LogFormat"
ckDefaultAdapterName = "LogDefaultAdapterName"
ckLevelName = "LogLevelName"
ckIncludeNouns = "LogIncludeNouns"
ckExcludeNouns = "LogExcludeNouns"
ckExcludeBypassLevelName = "LogExcludeBypassLevelName"
)
// Other constants
const (
defaultFormat = "{{.Noun}}: [{{.Level}}] {{if eq .ExcludeBypass true}} [BYPASS]{{end}} {{.Message}}"
defaultLevelName = LevelNameInfo
)
// Config
var (
// Alternative format.
format = defaultFormat
// Alternative adapter.
defaultAdapterName = ""
// Alternative level at which to display log-items
levelName = defaultLevelName
// Configuration-driven comma-separated list of nouns to include.
includeNouns = ""
// Configuration-driven comma-separated list of nouns to exclude.
excludeNouns = ""
// Level at which to disregard exclusion (if the severity of a message
// meets or exceed this, always display).
excludeBypassLevelName = ""
)
// Other
var (
configurationLoaded = false
)
// Return the current default adapter name.
func GetDefaultAdapterName() string {
return defaultAdapterName
}
// The adapter will automatically be the first one registered. This overrides
// that.
func SetDefaultAdapterName(name string) {
defaultAdapterName = name
}
func LoadConfiguration(cp ConfigurationProvider) {
configuredDefaultAdapterName := cp.DefaultAdapterName()
if configuredDefaultAdapterName != "" {
defaultAdapterName = configuredDefaultAdapterName
}
includeNouns = cp.IncludeNouns()
excludeNouns = cp.ExcludeNouns()
excludeBypassLevelName = cp.ExcludeBypassLevelName()
f := cp.Format()
if f != "" {
format = f
}
ln := cp.LevelName()
if ln != "" {
levelName = ln
}
configurationLoaded = true
}
func getConfigState() map[string]interface{} {
return map[string]interface{}{
"format": format,
"defaultAdapterName": defaultAdapterName,
"levelName": levelName,
"includeNouns": includeNouns,
"excludeNouns": excludeNouns,
"excludeBypassLevelName": excludeBypassLevelName,
}
}
func setConfigState(config map[string]interface{}) {
format = config["format"].(string)
defaultAdapterName = config["defaultAdapterName"].(string)
levelName = config["levelName"].(string)
includeNouns = config["includeNouns"].(string)
excludeNouns = config["excludeNouns"].(string)
excludeBypassLevelName = config["excludeBypassLevelName"].(string)
}
func getConfigDump() string {
return fmt.Sprintf(
"Current configuration:\n"+
" FORMAT=[%s]\n"+
" DEFAULT-ADAPTER-NAME=[%s]\n"+
" LEVEL-NAME=[%s]\n"+
" INCLUDE-NOUNS=[%s]\n"+
" EXCLUDE-NOUNS=[%s]\n"+
" EXCLUDE-BYPASS-LEVEL-NAME=[%s]",
format, defaultAdapterName, levelName, includeNouns, excludeNouns, excludeBypassLevelName)
}
func IsConfigurationLoaded() bool {
return configurationLoaded
}
type ConfigurationProvider interface {
// Alternative format (defaults to .
Format() string
// Alternative adapter (defaults to "appengine").
DefaultAdapterName() string
// Alternative level at which to display log-items (defaults to
// "info").
LevelName() string
// Configuration-driven comma-separated list of nouns to include. Defaults
// to empty.
IncludeNouns() string
// Configuration-driven comma-separated list of nouns to exclude. Defaults
// to empty.
ExcludeNouns() string
// Level at which to disregard exclusion (if the severity of a message
// meets or exceed this, always display). Defaults to empty.
ExcludeBypassLevelName() string
}
// Environment configuration-provider.
type EnvironmentConfigurationProvider struct {
}
func NewEnvironmentConfigurationProvider() *EnvironmentConfigurationProvider {
return new(EnvironmentConfigurationProvider)
}
func (ecp *EnvironmentConfigurationProvider) Format() string {
return os.Getenv(ckFormat)
}
func (ecp *EnvironmentConfigurationProvider) DefaultAdapterName() string {
return os.Getenv(ckDefaultAdapterName)
}
func (ecp *EnvironmentConfigurationProvider) LevelName() string {
return os.Getenv(ckLevelName)
}
func (ecp *EnvironmentConfigurationProvider) IncludeNouns() string {
return os.Getenv(ckIncludeNouns)
}
func (ecp *EnvironmentConfigurationProvider) ExcludeNouns() string {
return os.Getenv(ckExcludeNouns)
}
func (ecp *EnvironmentConfigurationProvider) ExcludeBypassLevelName() string {
return os.Getenv(ckExcludeBypassLevelName)
}
// Static configuration-provider.
type StaticConfigurationProvider struct {
format string
defaultAdapterName string
levelName string
includeNouns string
excludeNouns string
excludeBypassLevelName string
}
func NewStaticConfigurationProvider() *StaticConfigurationProvider {
return new(StaticConfigurationProvider)
}
func (scp *StaticConfigurationProvider) SetFormat(format string) {
scp.format = format
}
func (scp *StaticConfigurationProvider) SetDefaultAdapterName(adapterName string) {
scp.defaultAdapterName = adapterName
}
func (scp *StaticConfigurationProvider) SetLevelName(levelName string) {
scp.levelName = levelName
}
func (scp *StaticConfigurationProvider) SetIncludeNouns(includeNouns string) {
scp.includeNouns = includeNouns
}
func (scp *StaticConfigurationProvider) SetExcludeNouns(excludeNouns string) {
scp.excludeNouns = excludeNouns
}
func (scp *StaticConfigurationProvider) SetExcludeBypassLevelName(excludeBypassLevelName string) {
scp.excludeBypassLevelName = excludeBypassLevelName
}
func (scp *StaticConfigurationProvider) Format() string {
return scp.format
}
func (scp *StaticConfigurationProvider) DefaultAdapterName() string {
return scp.defaultAdapterName
}
func (scp *StaticConfigurationProvider) LevelName() string {
return scp.levelName
}
func (scp *StaticConfigurationProvider) IncludeNouns() string {
return scp.includeNouns
}
func (scp *StaticConfigurationProvider) ExcludeNouns() string {
return scp.excludeNouns
}
func (scp *StaticConfigurationProvider) ExcludeBypassLevelName() string {
return scp.excludeBypassLevelName
}
func init() {
// Do the initial configuration-load from the environment. We gotta seed it
// with something for simplicity's sake.
ecp := NewEnvironmentConfigurationProvider()
LoadConfiguration(ecp)
}
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