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/
globalconfig.go
98 lines (85 loc) · 2.78 KB
/
globalconfig.go
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// Copyright (c) 2015-2016 The btcsuite developers
// Copyright (c) 2016 The Decred developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package main
import (
"errors"
"fmt"
"os"
"path/filepath"
"github.com/decred/dcrd/chaincfg"
"github.com/decred/dcrd/database"
_ "github.com/decred/dcrd/database/ffldb"
"github.com/decred/dcrutil"
)
var (
dcrdHomeDir = dcrutil.AppDataDir("dcrd", false)
knownDbTypes = database.SupportedDrivers()
activeNetParams = &chaincfg.MainNetParams
// Default global config.
cfg = &config{
DataDir: filepath.Join(dcrdHomeDir, "data"),
DbType: "ffldb",
}
)
// config defines the global configuration options.
type config struct {
DataDir string `short:"b" long:"datadir" description:"Location of the dcrd data directory"`
DbType string `long:"dbtype" description:"Database backend to use for the Block Chain"`
TestNet bool `long:"testnet" description:"Use the test network"`
SimNet bool `long:"simnet" description:"Use the simulation test network"`
}
// fileExists reports whether the named file or directory exists.
func fileExists(name string) bool {
if _, err := os.Stat(name); err != nil {
if os.IsNotExist(err) {
return false
}
}
return true
}
// validDbType returns whether or not dbType is a supported database type.
func validDbType(dbType string) bool {
for _, knownType := range knownDbTypes {
if dbType == knownType {
return true
}
}
return false
}
// setupGlobalConfig examine the global configuration options for any conditions
// which are invalid as well as performs any addition setup necessary after the
// initial parse.
func setupGlobalConfig() error {
// Multiple networks can't be selected simultaneously.
// Count number of network flags passed; assign active network params
// while we're at it
numNets := 0
if cfg.TestNet {
numNets++
activeNetParams = &chaincfg.TestNetParams
}
if cfg.SimNet {
numNets++
activeNetParams = &chaincfg.SimNetParams
}
if numNets > 1 {
return errors.New("The testnet and simnet params can't be " +
"used together -- choose one of the two")
}
// Validate database type.
if !validDbType(cfg.DbType) {
str := "The specified database type [%v] is invalid -- " +
"supported types %v"
return fmt.Errorf(str, cfg.DbType, knownDbTypes)
}
// Append the network type to the data directory so it is "namespaced"
// per network. In addition to the block database, there are other
// pieces of data that are saved to disk such as address manager state.
// All data is specific to a network, so namespacing the data directory
// means each individual piece of serialized data does not have to
// worry about changing names per network and such.
cfg.DataDir = filepath.Join(cfg.DataDir, activeNetParams.Name)
return nil
}