TUN-5261: Collect QUIC metrics about RTT, packets and bytes transfered and log events at tracing level

vendor/github.com/francoispqt/gojay/decode_pool.go

@@ -0,0 +1,64 @@
+package gojay
+
+import (
+	"io"
+	"sync"
+)
+
+var decPool = sync.Pool{
+	New: newDecoderPool,
+}
+
+func init() {
+	for i := 0; i < 32; i++ {
+		decPool.Put(NewDecoder(nil))
+	}
+}
+
+// NewDecoder returns a new decoder.
+// It takes an io.Reader implementation as data input.
+func NewDecoder(r io.Reader) *Decoder {
+	return &Decoder{
+		called:   0,
+		cursor:   0,
+		keysDone: 0,
+		err:      nil,
+		r:        r,
+		data:     make([]byte, 512),
+		length:   0,
+		isPooled: 0,
+	}
+}
+func newDecoderPool() interface{} {
+	return NewDecoder(nil)
+}
+
+// BorrowDecoder borrows a Decoder from the pool.
+// It takes an io.Reader implementation as data input.
+//
+// In order to benefit from the pool, a borrowed decoder must be released after usage.
+func BorrowDecoder(r io.Reader) *Decoder {
+	return borrowDecoder(r, 512)
+}
+func borrowDecoder(r io.Reader, bufSize int) *Decoder {
+	dec := decPool.Get().(*Decoder)
+	dec.called = 0
+	dec.keysDone = 0
+	dec.cursor = 0
+	dec.err = nil
+	dec.r = r
+	dec.length = 0
+	dec.isPooled = 0
+	if bufSize > 0 {
+		dec.data = make([]byte, bufSize)
+	}
+	return dec
+}
+
+// Release sends back a Decoder to the pool.
+// If a decoder is used after calling Release
+// a panic will be raised with an InvalidUsagePooledDecoderError error.
+func (dec *Decoder) Release() {
+	dec.isPooled = 1
+	decPool.Put(dec)
+}