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utils.go
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utils.go
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package config
import (
"bufio"
"crypto/x509"
"encoding/json"
"encoding/pem"
"errors"
"os"
"path/filepath"
"strings"
"github.com/agencyenterprise/gossip-host/pkg/logger"
"github.com/gobuffalo/packr/v2"
lcrypto "github.com/libp2p/go-libp2p-core/crypto"
"github.com/spf13/viper"
)
func trimExtension(filename string) string {
return strings.TrimSuffix(filename, filepath.Ext(filename))
}
func loadPriv(loc string) ([]byte, error) {
privateKeyFile, err := os.Open(loc)
if err != nil {
logger.Errorf("err loading private key pem file: %s\n%v", loc, err)
return nil, err
}
defer privateKeyFile.Close()
pemfileinfo, err := privateKeyFile.Stat()
if err != nil {
logger.Errorf("err statting private key file:\n%v", err)
return nil, err
}
var size int64 = pemfileinfo.Size()
pembytes := make([]byte, size)
buffer := bufio.NewReader(privateKeyFile)
_, err = buffer.Read(pembytes)
return []byte(pembytes), err
}
func parseConfigFile(conf *Config, confLoc string) error {
var err error
v := viper.New()
v.SetConfigName(trimExtension(confLoc))
v.AddConfigPath(".")
if err = v.ReadInConfig(); err != nil {
logger.Errorf("err reading configuration file: %s\n%v", confLoc, err)
return err
}
if err = v.Unmarshal(conf); err != nil {
logger.Errorf("err unmarshaling config\n%v", err)
return err
}
return nil
}
func loadDefaultBox() *packr.Box {
return packr.New("defaults", defaultsLoc)
}
func loadDefaultConfig(box *packr.Box) ([]byte, error) {
// Get the string representation of a file, or an error if it doesn't exist:
return box.Find(defaultConfigName)
}
func parsePrivateKey(privB []byte) (lcrypto.PrivKey, error) {
data, _ := pem.Decode(privB)
if data == nil {
logger.Error("err decoding default PEM file. Nil data block")
return nil, errors.New("err decoding default PEM file")
}
cPriv, err := x509.ParsePKCS8PrivateKey(data.Bytes)
if err != nil {
logger.Errorf("err parsing private key bytes:\n%v", err)
return nil, err
}
priv, _, err := lcrypto.KeyPairFromStdKey(cPriv)
if err != nil {
logger.Errorf("err generating lcrypto priv key:\n%v", err)
return nil, err
}
return priv, nil
}
func parseDefaults(conf *Config) error {
box := loadDefaultBox()
defaultConfig, err := loadDefaultConfig(box)
if err != nil {
logger.Errorf("err loading default config:\n%v", err)
return err
}
if err := json.Unmarshal(defaultConfig, conf); err != nil {
logger.Errorf("err unmarshaling config\n%v", err)
return err
}
return nil
}
// note: this could panic!
func mergeDefaults(conf, defaults *Config) {
// subnet
if conf.Subnet.NumHosts == 0 {
conf.Subnet.NumHosts = defaults.Subnet.NumHosts
}
if conf.Subnet.PubsubCIDR == "" {
conf.Subnet.PubsubCIDR = defaults.Subnet.PubsubCIDR
}
if len(conf.Subnet.PubsubPortRange) == 0 {
conf.Subnet.PubsubPortRange = defaults.Subnet.PubsubPortRange
}
if conf.Subnet.RPCCIDR == "" {
conf.Subnet.RPCCIDR = defaults.Subnet.RPCCIDR
}
if len(conf.Subnet.RPCPortRange) == 0 {
conf.Subnet.RPCPortRange = defaults.Subnet.RPCPortRange
}
if conf.Subnet.PeerTopology == "" {
conf.Subnet.PeerTopology = defaults.Subnet.PeerTopology
}
// host
if len(conf.Host.Transports) == 0 {
conf.Host.Transports = defaults.Host.Transports
}
if len(conf.Host.Muxers) == 0 {
conf.Host.Muxers = defaults.Host.Muxers
}
if conf.Host.Security == "" {
conf.Host.Security = defaults.Host.Security
}
}