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factory.go
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factory.go
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// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package logging
import (
"fmt"
"sync"
)
// Factory creates new instances of different types of Logger
type Factory interface {
// Make creates a new logger with name [name]
Make(name string) (Logger, error)
// MakeChain creates a new logger to log the events of chain [chainID]
MakeChain(chainID string) (Logger, error)
// MakeChainChild creates a new sublogger for a [name] module of a chain [chainId]
MakeChainChild(chainID string, name string) (Logger, error)
// SetLogLevels sets log levels for all loggers in factory with given logger name, level pairs.
SetLogLevel(name string, level Level) error
// SetDisplayLevels sets log display levels for all loggers in factory with given logger name, level pairs.
SetDisplayLevel(name string, level Level) error
// GetLogLevels returns all log levels in factory as name, level pairs
GetLogLevel(name string) (Level, error)
// GetDisplayLevels returns all log display levels in factory as name, level pairs
GetDisplayLevel(name string) (Level, error)
// GetLoggerNames returns the names of all logs created by this factory
GetLoggerNames() []string
// Close stops and clears all of a Factory's instantiated loggers
Close()
}
// factory implements the Factory interface
type factory struct {
config Config
lock sync.RWMutex
// For each logger created by this factory:
// Logger name --> the logger.
loggers map[string]Logger
}
// NewFactory returns a new instance of a Factory producing loggers configured with
// the values set in the [config] parameter
func NewFactory(config Config) Factory {
return &factory{
config: config,
loggers: make(map[string]Logger),
}
}
// Assumes [f.lock] is held
func (f *factory) makeLogger(config Config) (Logger, error) {
if _, ok := f.loggers[config.LoggerName]; ok {
return nil, fmt.Errorf("logger with name %q already exists", config.LoggerName)
}
l, err := newLog(config)
if err != nil {
return nil, err
}
f.loggers[config.LoggerName] = l
return l, nil
}
// Make implements the Factory interface
func (f *factory) Make(name string) (Logger, error) {
f.lock.Lock()
defer f.lock.Unlock()
config := f.config
config.LoggerName = name
return f.makeLogger(config)
}
// MakeChain implements the Factory interface
func (f *factory) MakeChain(chainID string) (Logger, error) {
f.lock.Lock()
defer f.lock.Unlock()
config := f.config
config.MsgPrefix = chainID + " Chain"
config.LoggerName = chainID
return f.makeLogger(config)
}
// MakeChainChild implements the Factory interface
func (f *factory) MakeChainChild(chainID string, name string) (Logger, error) {
f.lock.Lock()
defer f.lock.Unlock()
config := f.config
config.MsgPrefix = chainID + " Chain"
config.LoggerName = chainID + "." + name
return f.makeLogger(config)
}
// SetLogLevels implements the Factory interface
func (f *factory) SetLogLevel(name string, level Level) error {
f.lock.RLock()
defer f.lock.RUnlock()
logger, ok := f.loggers[name]
if !ok {
return fmt.Errorf("logger with name %q not found", name)
}
logger.SetLogLevel(level)
return nil
}
// SetLogLevels implements the Factory interface
func (f *factory) SetDisplayLevel(name string, level Level) error {
f.lock.RLock()
defer f.lock.RUnlock()
logger, ok := f.loggers[name]
if !ok {
return fmt.Errorf("logger with name %q not found", name)
}
logger.SetDisplayLevel(level)
return nil
}
// GetLogLevels implements the Factory interface
func (f *factory) GetLogLevel(name string) (Level, error) {
f.lock.RLock()
defer f.lock.RUnlock()
logger, ok := f.loggers[name]
if !ok {
return -1, fmt.Errorf("logger with name %q not found", name)
}
return logger.GetLogLevel(), nil
}
// GetLogLevels implements the Factory interface
func (f *factory) GetDisplayLevel(name string) (Level, error) {
f.lock.RLock()
defer f.lock.RUnlock()
logger, ok := f.loggers[name]
if !ok {
return -1, fmt.Errorf("logger with name %q not found", name)
}
return logger.GetDisplayLevel(), nil
}
// GetLoggerNames implements the Factory interface
func (f *factory) GetLoggerNames() []string {
f.lock.RLock()
defer f.lock.RUnlock()
names := make([]string, 0, len(f.loggers))
for name := range f.loggers {
names = append(names, name)
}
return names
}
// Close implements the Factory interface
func (f *factory) Close() {
f.lock.Lock()
defer f.lock.Unlock()
for _, logger := range f.loggers {
logger.Stop()
}
f.loggers = nil
}