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package core
import (
"sync"
"go.uber.org/zap"
)
var (
lock sync.RWMutex
instance *Instance
)
// GetInstance returns an instance of given config.
// If there already exists an instance (during server reload), it will be updated with the new config.
// Otherwise, a new instance will be created.
// User can pass in an optional logger to log basic metrics about the initialized state.
func GetInstance(config Config, logger *zap.Logger) (*Instance, error) {
lock.Lock()
defer lock.Unlock()
if instance == nil {
// Initialize a new instance.
state, pendingElems, blocklistElems, approvalElems, err := NewInstanceState(config)
if err != nil {
return nil, err
}
logger.Info("cerberus state initialized",
zap.Int64("pending_elems", pendingElems),
zap.Int64("blocklist_elems", blocklistElems),
zap.Int64("approval_elems", approvalElems),
)
instance = &Instance{
Config: config,
InstanceState: state,
}
return instance, nil
}
// Update the existing instance with the new config.
err := instance.UpdateWithConfig(config, logger)
if err != nil {
return nil, err
}
return instance, nil
}
|
