chore(vendor): Add jsonparser dependency for filter predicates

* Added jsonparser helper package to decode influxdb.ID

go.mod

@@ -13,6 +13,7 @@ require (
 	github.com/benbjohnson/tmpl v1.0.0
 	github.com/boltdb/bolt v1.3.1 // indirect
 	github.com/bouk/httprouter v0.0.0-20160817010721-ee8b3818a7f5
+	github.com/buger/jsonparser v0.0.0-20191004114745-ee4c978eae7e
 	github.com/cespare/xxhash v1.1.0
 	github.com/codahale/hdrhistogram v0.0.0-20161010025455-3a0bb77429bd // indirect
 	github.com/coreos/bbolt v1.3.1-coreos.6

go.sum

@@ -64,6 +64,8 @@ github.com/boltdb/bolt v1.3.1 h1:JQmyP4ZBrce+ZQu0dY660FMfatumYDLun9hBCUVIkF4=
 github.com/boltdb/bolt v1.3.1/go.mod h1:clJnj/oiGkjum5o1McbSZDSLxVThjynRyGBgiAx27Ps=
 github.com/bouk/httprouter v0.0.0-20160817010721-ee8b3818a7f5 h1:kS0dw4K730x7cxT+bVyTyYJZHuSoH7ofSr/Ijit56Qw=
 github.com/bouk/httprouter v0.0.0-20160817010721-ee8b3818a7f5/go.mod h1:CDReaxg1cmLrtcasZy43l4EYPAknXLiQSrb7tLw5zXM=
+github.com/buger/jsonparser v0.0.0-20191004114745-ee4c978eae7e h1:oJCXMss/3rg5F6Poy9wG3JQusc58Mzk5B9Z6wSnssNE=
+github.com/buger/jsonparser v0.0.0-20191004114745-ee4c978eae7e/go.mod h1:errmMKH8tTB49UR2A8C8DPYkyudelsYJwJFaZHQ6ik8=
 github.com/c-bata/go-prompt v0.2.2 h1:uyKRz6Z6DUyj49QVijyM339UJV9yhbr70gESwbNU3e0=
 github.com/c-bata/go-prompt v0.2.2/go.mod h1:VzqtzE2ksDBcdln8G7mk2RX9QyGjH+OVqOCSiVIqS34=
 github.com/caarlos0/ctrlc v1.0.0 h1:2DtF8GSIcajgffDFJzyG15vO+1PuBWOMUdFut7NnXhw=

pkg/jsonparser/jsonparser.go

@@ -0,0 +1,45 @@
+package jsonparser
+
+import (
+	"github.com/buger/jsonparser"
+	"github.com/influxdata/influxdb"
+)
+
+// GetID returns an influxdb.ID for the specified keys path or an error if
+// the value cannot be decoded or does not exist.
+func GetID(data []byte, keys ...string) (val influxdb.ID, err error) {
+	v, _, _, err := jsonparser.Get(data, keys...)
+	if err != nil {
+		return 0, err
+	}
+
+	var id influxdb.ID
+	err = id.Decode(v)
+	if err != nil {
+		return 0, err
+	}
+
+	return id, nil
+}
+
+// GetOptionalID returns an influxdb.ID for the specified keys path or an error if
+// the value cannot be decoded. The value of exists will be false if the keys path
+// does not exist.
+func GetOptionalID(data []byte, keys ...string) (val influxdb.ID, exists bool, err error) {
+	v, typ, _, err := jsonparser.Get(data, keys...)
+	if typ == jsonparser.NotExist {
+		return 0, false, nil
+	}
+
+	if err != nil {
+		return 0, false, err
+	}
+
+	var id influxdb.ID
+	err = id.Decode(v)
+	if err != nil {
+		return 0, false, err
+	}
+
+	return id, true, nil
+}

pkg/jsonparser/jsonparser_test.go

@@ -0,0 +1,45 @@
+package jsonparser_test
+
+import (
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/influxdata/influxdb"
+	"github.com/influxdata/influxdb/pkg/jsonparser"
+)
+
+func TestGetID(t *testing.T) {
+	t.Run("decode valid id", func(t *testing.T) {
+		json := `{ "id": "000000000000000a" }`
+		got, err := jsonparser.GetID([]byte(json), "id")
+		if err != nil {
+			t.Error("unexpected error:", err)
+		}
+
+		if exp := influxdb.ID(10); got != exp {
+			t.Error("unexpected value: -got/+exp", cmp.Diff(got, exp))
+		}
+	})
+
+	t.Run("error invalid id", func(t *testing.T) {
+		json := `{ "id": "00000000000a" }`
+		_, err := jsonparser.GetID([]byte(json), "id")
+		if err == nil {
+			t.Error("expected error")
+		}
+	})
+}
+
+func TestGetOptionalID(t *testing.T) {
+	t.Run("missing id", func(t *testing.T) {
+		json := `{ "name": "foo" }`
+		_, got, err := jsonparser.GetOptionalID([]byte(json), "id")
+		if err != nil {
+			t.Error("unexpected error:", err)
+		}
+
+		if exp := false; got != exp {
+			t.Error("unexpected value: -got/+exp", cmp.Diff(got, exp))
+		}
+	})
+}