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mysql.go
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mysql.go
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package physical
import (
"database/sql"
"fmt"
"sort"
"strings"
"time"
"github.com/armon/go-metrics"
_ "github.com/go-sql-driver/mysql"
)
// MySQLBackend is a physical backend that stores data
// within MySQL database.
type MySQLBackend struct {
dbTable string
client *sql.DB
statements map[string]*sql.Stmt
}
// newMySQLBackend constructs a MySQL backend using the given API client and
// server address and credential for accessing mysql database.
func newMySQLBackend(conf map[string]string) (Backend, error) {
// Get the MySQL credentials to perform read/write operations.
username, ok := conf["username"]
if !ok || username == "" {
return nil, fmt.Errorf("missing username")
}
password, ok := conf["password"]
if !ok || username == "" {
return nil, fmt.Errorf("missing password")
}
// Get or set MySQL server address. Defaults to localhost and default port(3306)
address, ok := conf["address"]
if !ok {
address = "127.0.0.1:3306"
}
// Get the MySQL database and table details.
database, ok := conf["database"]
if !ok {
database = "vault"
}
table, ok := conf["table"]
if !ok {
table = "vault"
}
dbTable := database + "." + table
// Create MySQL handle for the database.
dsn := username + ":" + password + "@tcp(" + address + ")/"
db, err := sql.Open("mysql", dsn)
if err != nil {
return nil, fmt.Errorf("failed to connect to mysql: %v", err)
}
// Create the required database if it doesn't exists.
if _, err := db.Exec("CREATE DATABASE IF NOT EXISTS " + database); err != nil {
return nil, fmt.Errorf("failed to create mysql database: %v", err)
}
// Create the required table if it doesn't exists.
create_query := "CREATE TABLE IF NOT EXISTS " + dbTable +
" (vault_key varchar(512), vault_value mediumblob, PRIMARY KEY (vault_key))"
if _, err := db.Exec(create_query); err != nil {
return nil, fmt.Errorf("failed to create mysql table: %v", err)
}
// Setup the backend.
m := &MySQLBackend{
dbTable: dbTable,
client: db,
statements: make(map[string]*sql.Stmt),
}
// Prepare all the statements required
statements := map[string]string{
"put": "INSERT INTO " + dbTable +
" VALUES( ?, ? ) ON DUPLICATE KEY UPDATE vault_value=VALUES(vault_value)",
"get": "SELECT vault_value FROM " + dbTable + " WHERE vault_key = ?",
"delete": "DELETE FROM " + dbTable + " WHERE vault_key = ?",
"list": "SELECT vault_key FROM " + dbTable + " WHERE vault_key LIKE ?",
}
for name, query := range statements {
if err := m.prepare(name, query); err != nil {
return nil, err
}
}
return m, nil
}
// prepare is a helper to prepare a query for future execution
func (m *MySQLBackend) prepare(name, query string) error {
stmt, err := m.client.Prepare(query)
if err != nil {
return fmt.Errorf("failed to prepare '%s': %v", name, err)
}
m.statements[name] = stmt
return nil
}
// Put is used to insert or update an entry.
func (m *MySQLBackend) Put(entry *Entry) error {
defer metrics.MeasureSince([]string{"mysql", "put"}, time.Now())
_, err := m.statements["put"].Exec(entry.Key, entry.Value)
if err != nil {
return err
}
return nil
}
// Get is used to fetch and entry.
func (m *MySQLBackend) Get(key string) (*Entry, error) {
defer metrics.MeasureSince([]string{"mysql", "get"}, time.Now())
var result []byte
err := m.statements["get"].QueryRow(key).Scan(&result)
if err == sql.ErrNoRows {
return nil, nil
}
if err != nil {
return nil, err
}
ent := &Entry{
Key: key,
Value: result,
}
return ent, nil
}
// Delete is used to permanently delete an entry
func (m *MySQLBackend) Delete(key string) error {
defer metrics.MeasureSince([]string{"mysql", "delete"}, time.Now())
_, err := m.statements["delete"].Exec(key)
if err != nil {
return err
}
return nil
}
// List is used to list all the keys under a given
// prefix, up to the next prefix.
func (m *MySQLBackend) List(prefix string) ([]string, error) {
defer metrics.MeasureSince([]string{"mysql", "list"}, time.Now())
// Add the % wildcard to the prefix to do the prefix search
likePrefix := prefix + "%"
rows, err := m.statements["list"].Query(likePrefix)
var keys []string
for rows.Next() {
var key string
err = rows.Scan(&key)
if err != nil {
return nil, fmt.Errorf("failed to scan rows: %v", err)
}
key = strings.TrimPrefix(key, prefix)
if i := strings.Index(key, "/"); i == -1 {
// Add objects only from the current 'folder'
keys = append(keys, key)
} else if i != -1 {
// Add truncated 'folder' paths
keys = appendIfMissing(keys, string(key[:i+1]))
}
}
sort.Strings(keys)
return keys, nil
}