jsonutil: add JSON utility functions

jsonutil/jsonutil.go

@@ -0,0 +1,30 @@
+// Package jsonutil implements JSON utility functions.
+package jsonutil
+
+import (
+	"bufio"
+	"encoding/json"
+	"io"
+	"os"
+
+	"github.com/pkg/errors"
+)
+
+// Parse parses the given JSON stream into v.
+func Parse(r io.Reader, v interface{}) error {
+	br := bufio.NewReader(r)
+	dec := json.NewDecoder(br)
+	return dec.Decode(v)
+}
+
+// ParseFile parses the given JSON file into v.
+func ParseFile(path string, v interface{}) error {
+	f, err := os.Open(path)
+	if err != nil {
+		return errors.WithStack(err)
+	}
+	defer f.Close()
+	br := bufio.NewReader(f)
+	dec := json.NewDecoder(br)
+	return dec.Decode(v)
+}