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cmd, eth, node, rpc, xeth: use single-instance services

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Péter Szilágyi
2015-11-26 18:35:44 +02:00
parent 1e806c4c77
commit 3e1000fda3
17 changed files with 330 additions and 295 deletions
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38
node/service.go
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@ -29,39 +29,29 @@ import (
// 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
services map[string]Service // Index of the already constructed services
EventMux *event.TypeMux // Event multiplexer used for decoupled notifications
datadir string // Data directory for protocol persistence
services map[reflect.Type]Service // Index of the already constructed services
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) {
// OpenDatabase 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) OpenDatabase(name string, cache int) (ethdb.Database, error) {
if ctx.datadir == "" {
return ethdb.NewMemDatabase()
}
return ethdb.NewLDBDatabase(filepath.Join(ctx.datadir, name), cache)
}
// Service retrieves an already constructed service registered under a given id.
func (ctx *ServiceContext) Service(id string) Service {
return ctx.services[id]
}
// SingletonService retrieves an already constructed service using a specific type
// implementing the Service interface. This is a utility function for scenarios
// where it is known that only one instance of a given service type is running,
// allowing to access services without needing to know their specific id with
// which they were registered.
func (ctx *ServiceContext) SingletonService(service interface{}) (string, error) {
for id, running := range ctx.services {
if reflect.TypeOf(running) == reflect.ValueOf(service).Elem().Type() {
reflect.ValueOf(service).Elem().Set(reflect.ValueOf(running))
return id, nil
}
// Service retrieves a currently running service registered of a specific type.
func (ctx *ServiceContext) Service(service interface{}) error {
element := reflect.ValueOf(service).Elem()
if running, ok := ctx.services[element.Type()]; ok {
element.Set(reflect.ValueOf(running))
return nil
}
return "", ErrServiceUnknown
return ErrServiceUnknown
}
// ServiceConstructor is the function signature of the constructors needed to be