forked from gcash/bchd
/
driver.go
102 lines (85 loc) · 2.73 KB
/
driver.go
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// Copyright (c) 2015-2016 The btcsuite developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package ffldb
import (
"fmt"
"github.com/mwanon/bchd/database"
"github.com/mwanon/bchd/wire"
"github.com/mwanon/bchlog"
)
var log = bchlog.Disabled
const (
dbType = "ffldb"
)
// parseArgs parses the arguments from the database Open/Create methods.
func parseArgs(funcName string, args ...interface{}) (string, wire.BitcoinNet, uint64, uint32, error) {
if len(args) < 2 || len(args) > 4 {
return "", 0, 0, 0, fmt.Errorf("invalid arguments to %s.%s -- "+
"expected database path and block network with optional cache size "+
"and flush seconds", dbType, funcName)
}
dbPath, ok := args[0].(string)
if !ok {
return "", 0, 0, 0, fmt.Errorf("first argument to %s.%s is invalid -- "+
"expected database path string", dbType, funcName)
}
network, ok := args[1].(wire.BitcoinNet)
if !ok {
return "", 0, 0, 0, fmt.Errorf("second argument to %s.%s is invalid -- "+
"expected block network", dbType, funcName)
}
var cacheSize uint64
var flushSecs uint32
if len(args) > 2 {
cacheSize, ok = args[2].(uint64)
if !ok {
return "", 0, 0, 0, fmt.Errorf("third argument to %s.%s is invalid -- "+
"expected cache size", dbType, funcName)
}
}
if len(args) > 3 {
flushSecs, ok = args[3].(uint32)
if !ok {
return "", 0, 0, 0, fmt.Errorf("third argument to %s.%s is invalid -- "+
"expected flush seconds", dbType, funcName)
}
}
return dbPath, network, cacheSize, flushSecs, nil
}
// openDBDriver is the callback provided during driver registration that opens
// an existing database for use.
func openDBDriver(args ...interface{}) (database.DB, error) {
dbPath, network, cacheSize, flushSecs, err := parseArgs("Open", args...)
if err != nil {
return nil, err
}
return openDB(dbPath, network, false, cacheSize, flushSecs)
}
// createDBDriver is the callback provided during driver registration that
// creates, initializes, and opens a database for use.
func createDBDriver(args ...interface{}) (database.DB, error) {
dbPath, network, cacheSize, flushSecs, err := parseArgs("Create", args...)
if err != nil {
return nil, err
}
return openDB(dbPath, network, true, cacheSize, flushSecs)
}
// useLogger is the callback provided during driver registration that sets the
// current logger to the provided one.
func useLogger(logger bchlog.Logger) {
log = logger
}
func init() {
// Register the driver.
driver := database.Driver{
DbType: dbType,
Create: createDBDriver,
Open: openDBDriver,
UseLogger: useLogger,
}
if err := database.RegisterDriver(driver); err != nil {
panic(fmt.Sprintf("Failed to regiser database driver '%s': %v",
dbType, err))
}
}