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// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package node
import (
"path/filepath"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/p2p"
)
// ServiceContext is a collection of service independent options inherited from
// the protocol stack, that is passed to all constructors to be optionally used;
// as well as utility methods to operate on the service environment.
type ServiceContext struct {
dataDir string // Data directory for protocol persistence
EventMux *event.TypeMux // Event multiplexer used for decoupled notifications
}
// Database opens an existing database with the given name (or creates one if no
// previous can be found) from within the node's data directory. If the node is
// an ephemeral one, a memory database is returned.
func (ctx *ServiceContext) Database(name string, cache int) (ethdb.Database, error) {
if ctx.dataDir == "" {
return ethdb.NewMemDatabase()
}
return ethdb.NewLDBDatabase(filepath.Join(ctx.dataDir, name), cache)
}
// ServiceConstructor is the function signature of the constructors needed to be
// registered for service instantiation.
type ServiceConstructor func(ctx *ServiceContext) (Service, error)
// Service is an individual protocol that can be registered into a node.
//
// Notes:
// - Service life-cycle management is delegated to the node. The service is
// allowed to initialize itself upon creation, but no goroutines should be
// spun up outside of the Start method.
// - Restart logic is not required as the node will create a fresh instance
// every time a service is started.
type Service interface {
// Protocol retrieves the P2P protocols the service wishes to start.
Protocols() []p2p.Protocol
// Start spawns any goroutines required by the service.
Start() error
// Stop terminates all goroutines belonging to the service, blocking until they
// are all terminated.
Stop() error
}
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