use istio client-go library instead of knative (#1661)

use istio client-go library instead of knative
bump kubernetes dependency version
change code coverage to codecov

vendor/sigs.k8s.io/structured-merge-diff/value/fastjson.go

@@ -0,0 +1,149 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package value
+
+import (
+	"bytes"
+	"fmt"
+
+	jsoniter "github.com/json-iterator/go"
+)
+
+var (
+	readPool  = jsoniter.NewIterator(jsoniter.ConfigCompatibleWithStandardLibrary).Pool()
+	writePool = jsoniter.NewStream(jsoniter.ConfigCompatibleWithStandardLibrary, nil, 1024).Pool()
+)
+
+// FromJSONFast is a helper function for reading a JSON document
+func FromJSONFast(input []byte) (Value, error) {
+	iter := readPool.BorrowIterator(input)
+	defer readPool.ReturnIterator(iter)
+	return ReadJSONIter(iter)
+}
+
+func ReadJSONIter(iter *jsoniter.Iterator) (Value, error) {
+	next := iter.WhatIsNext()
+	switch next {
+	case jsoniter.InvalidValue:
+		iter.ReportError("reading an object", "got invalid token")
+		return Value{}, iter.Error
+	case jsoniter.StringValue:
+		str := String(iter.ReadString())
+		return Value{StringValue: &str}, nil
+	case jsoniter.NumberValue:
+		number := iter.ReadNumber()
+		isFloat := false
+		for _, c := range number {
+			if c == 'e' || c == 'E' || c == '.' {
+				isFloat = true
+				break
+			}
+		}
+		if isFloat {
+			f, err := number.Float64()
+			if err != nil {
+				iter.ReportError("parsing as float", err.Error())
+				return Value{}, err
+			}
+			return Value{FloatValue: (*Float)(&f)}, nil
+		}
+		i, err := number.Int64()
+		if err != nil {
+			iter.ReportError("parsing as float", err.Error())
+			return Value{}, err
+		}
+		return Value{IntValue: (*Int)(&i)}, nil
+	case jsoniter.NilValue:
+		iter.ReadNil()
+		return Value{Null: true}, nil
+	case jsoniter.BoolValue:
+		b := Boolean(iter.ReadBool())
+		return Value{BooleanValue: &b}, nil
+	case jsoniter.ArrayValue:
+		list := &List{}
+		iter.ReadArrayCB(func(iter *jsoniter.Iterator) bool {
+			v, err := ReadJSONIter(iter)
+			if err != nil {
+				iter.Error = err
+				return false
+			}
+			list.Items = append(list.Items, v)
+			return true
+		})
+		return Value{ListValue: list}, iter.Error
+	case jsoniter.ObjectValue:
+		m := &Map{}
+		iter.ReadObjectCB(func(iter *jsoniter.Iterator, key string) bool {
+			v, err := ReadJSONIter(iter)
+			if err != nil {
+				iter.Error = err
+				return false
+			}
+			m.Items = append(m.Items, Field{Name: key, Value: v})
+			return true
+		})
+		return Value{MapValue: m}, iter.Error
+	default:
+		return Value{}, fmt.Errorf("unexpected object type %v", next)
+	}
+}
+
+// ToJSONFast is a helper function for producing a JSon document.
+func (v *Value) ToJSONFast() ([]byte, error) {
+	buf := bytes.Buffer{}
+	stream := writePool.BorrowStream(&buf)
+	defer writePool.ReturnStream(stream)
+	v.WriteJSONStream(stream)
+	err := stream.Flush()
+	return buf.Bytes(), err
+}
+
+func (v *Value) WriteJSONStream(stream *jsoniter.Stream) {
+	switch {
+	case v.Null:
+		stream.WriteNil()
+	case v.FloatValue != nil:
+		stream.WriteFloat64(float64(*v.FloatValue))
+	case v.IntValue != nil:
+		stream.WriteInt64(int64(*v.IntValue))
+	case v.BooleanValue != nil:
+		stream.WriteBool(bool(*v.BooleanValue))
+	case v.StringValue != nil:
+		stream.WriteString(string(*v.StringValue))
+	case v.ListValue != nil:
+		stream.WriteArrayStart()
+		for i := range v.ListValue.Items {
+			if i > 0 {
+				stream.WriteMore()
+			}
+			v.ListValue.Items[i].WriteJSONStream(stream)
+		}
+		stream.WriteArrayEnd()
+	case v.MapValue != nil:
+		stream.WriteObjectStart()
+		for i := range v.MapValue.Items {
+			if i > 0 {
+				stream.WriteMore()
+			}
+			stream.WriteObjectField(v.MapValue.Items[i].Name)
+			v.MapValue.Items[i].Value.WriteJSONStream(stream)
+		}
+		stream.WriteObjectEnd()
+	default:
+		stream.Write([]byte("invalid_value"))
+	}
+}