Add 'bolt get'.

1 files changed, 115 insertions, 0 deletions

diff --git a/cmd/bolt/main.go b/cmd/bolt/main.go
new file mode 100644
index 0000000..0a17a13
--- /dev/null
+++ b/cmd/bolt/main.go
@@ -0,0 +1,115 @@
+package main
+
+import (
+	"bytes"
+	"log"
+	"os"
+
+	"github.com/boltdb/bolt"
+	"github.com/codegangsta/cli"
+)
+
+func main() {
+	log.SetFlags(0)
+	NewApp().Run(os.Args)
+}
+
+// NewApp creates an Application instance.
+func NewApp() *cli.App {
+	app := cli.NewApp()
+	app.Name = "bolt"
+	app.Usage = "BoltDB toolkit"
+	app.Commands = []cli.Command{
+		{
+			Name:   "get",
+			Usage:  "retrieve a value for given key",
+			Action: Get,
+		},
+	}
+	return app
+}
+
+// Get retrieves the value for a given bucket/key.
+func Get(c *cli.Context) {
+	path, name, key := c.Args().Get(0), c.Args().Get(1), c.Args().Get(2)
+	if _, err := os.Stat(path); os.IsNotExist(err) {
+		fatal(err)
+		return
+	}
+
+	db, err := bolt.Open(path, 0600)
+	if err != nil {
+		fatal(err)
+		return
+	}
+	defer db.Close()
+
+	err = db.With(func(tx *bolt.Tx) error {
+		// Find bucket.
+		b := tx.Bucket(name)
+		if b == nil {
+			fatalf("bucket not found: %s", name)
+			return nil
+		}
+
+		// Find value for a given key.
+		value := b.Get([]byte(key))
+		if value == nil {
+			fatalf("key not found: %s", key)
+			return nil
+		}
+
+		logger.Println(string(value))
+		return nil
+	})
+	if err != nil {
+		fatal(err)
+		return
+	}
+}
+
+var logger = log.New(os.Stderr, "", 0)
+var logBuffer *bytes.Buffer
+
+func fatal(v ...interface{}) {
+	logger.Print(v...)
+	if !testMode {
+		os.Exit(1)
+	}
+}
+
+func fatalf(format string, v ...interface{}) {
+	logger.Printf(format, v...)
+	if !testMode {
+		os.Exit(1)
+	}
+}
+
+func fatalln(v ...interface{}) {
+	logger.Println(v...)
+	if !testMode {
+		os.Exit(1)
+	}
+}
+
+// LogBuffer returns the contents of the log.
+// This only works while the CLI is in test mode.
+func LogBuffer() string {
+	if logBuffer != nil {
+		return logBuffer.String()
+	}
+	return ""
+}
+
+var testMode bool
+
+// SetTestMode sets whether the CLI is running in test mode and resets the logger.
+func SetTestMode(value bool) {
+	testMode = value
+	if testMode {
+		logBuffer = bytes.NewBuffer(nil)
+		logger = log.New(logBuffer, "", 0)
+	} else {
+		logger = log.New(os.Stderr, "", 0)
+	}
+}