isle/go/garage/garagesrv/garagesrv.go

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// Package garage contains helper functions and types which are useful for
// setting up garage configs, processes, and deployments.
package garagesrv
import (
"crypto/ed25519"
"crypto/rand"
"encoding/hex"
"errors"
"fmt"
"io/fs"
"os"
"path/filepath"
"strconv"
)
func nodeKeyPath(metaDirPath string) string {
return filepath.Join(metaDirPath, "node_key")
}
func nodeKeyPubPath(metaDirPath string) string {
return filepath.Join(metaDirPath, "node_key.pub")
}
func nodeRPCPortPath(metaDirPath string) string {
return filepath.Join(metaDirPath, "isle", "rpc_port")
}
// loadAllocID returns the peer ID (ie the public key) of the node at the given
// meta directory.
func loadAllocID(metaDirPath string) (string, error) {
nodeKeyPubPath := nodeKeyPubPath(metaDirPath)
pubKey, err := os.ReadFile(nodeKeyPubPath)
if err != nil {
return "", fmt.Errorf("reading %q: %w", nodeKeyPubPath, err)
}
return hex.EncodeToString(pubKey), nil
}
// generatePeerKey generates and returns a public/private key pair for a garage
// instance.
func generatePeerKey() (pubKey, privKey []byte) {
pubKey, privKey, err := ed25519.GenerateKey(rand.Reader)
if err != nil {
panic(err)
}
return pubKey, privKey
}
// InitAlloc initializes the meta directory and keys for a particular
// allocation, if it hasn't been done so already. It returns the peer ID (ie the
// public key) and the rpc port in any case.
func InitAlloc(metaDirPath string, initRPCPort int) (string, int, error) {
initDirFor := func(path string) error {
dir := filepath.Dir(path)
return os.MkdirAll(dir, 0750)
}
var err error
exists := func(path string) bool {
if err != nil {
return false
} else if _, err = os.Stat(path); errors.Is(err, fs.ErrNotExist) {
err = nil
return false
} else if err != nil {
err = fmt.Errorf("checking if %q exists: %w", path, err)
return false
}
return true
}
nodeKeyPath := nodeKeyPath(metaDirPath)
nodeKeyPubPath := nodeKeyPubPath(metaDirPath)
nodeRPCPortPath := nodeRPCPortPath(metaDirPath)
nodeKeyPathExists := exists(nodeKeyPath)
nodeKeyPubPathExists := exists(nodeKeyPubPath)
nodeRPCPortPathExists := exists(nodeRPCPortPath)
if err != nil {
return "", 0, err
} else if nodeKeyPubPathExists != nodeKeyPathExists {
return "", 0, fmt.Errorf("%q or %q exist without the other existing", nodeKeyPath, nodeKeyPubPath)
}
var (
pubKeyStr string
rpcPort int
)
if nodeKeyPathExists {
if pubKeyStr, err = loadAllocID(metaDirPath); err != nil {
return "", 0, fmt.Errorf("reading node public key file: %w", err)
}
} else {
if err := initDirFor(nodeKeyPath); err != nil {
return "", 0, fmt.Errorf("creating directory for %q: %w", nodeKeyPath, err)
}
pubKey, privKey := generatePeerKey()
if err := os.WriteFile(nodeKeyPath, privKey, 0400); err != nil {
return "", 0, fmt.Errorf("writing private key to %q: %w", nodeKeyPath, err)
} else if err := os.WriteFile(nodeKeyPubPath, pubKey, 0440); err != nil {
return "", 0, fmt.Errorf("writing public key to %q: %w", nodeKeyPubPath, err)
}
pubKeyStr = hex.EncodeToString(pubKey)
}
if nodeRPCPortPathExists {
if rpcPortStr, err := os.ReadFile(nodeRPCPortPath); err != nil {
return "", 0, fmt.Errorf("reading rpc port from %q: %w", nodeRPCPortPath, err)
} else if rpcPort, err = strconv.Atoi(string(rpcPortStr)); err != nil {
return "", 0, fmt.Errorf("parsing rpc port %q from %q: %w", rpcPortStr, nodeRPCPortPath, err)
}
} else {
if err := initDirFor(nodeRPCPortPath); err != nil {
return "", 0, fmt.Errorf("creating directory for %q: %w", nodeRPCPortPath, err)
}
rpcPortStr := strconv.Itoa(initRPCPort)
if err := os.WriteFile(nodeRPCPortPath, []byte(rpcPortStr), 0440); err != nil {
return "", 0, fmt.Errorf("writing rpc port %q to %q: %w", rpcPortStr, nodeRPCPortPath, err)
}
rpcPort = initRPCPort
}
return pubKeyStr, rpcPort, nil
}