Rename Makefile targets

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alex@openfaas.com>

gateway/vendor/github.com/nats-io/nats.go/internal/parser/parse.go

@@ -0,0 +1,104 @@
+// Copyright 2020-2022 The NATS 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 parser
+
+import (
+	"errors"
+	"fmt"
+)
+
+const (
+	AckDomainTokenPos = iota + 2
+	AckAccHashTokenPos
+	AckStreamTokenPos
+	AckConsumerTokenPos
+	AckNumDeliveredTokenPos
+	AckStreamSeqTokenPos
+	AckConsumerSeqTokenPos
+	AckTimestampSeqTokenPos
+	AckNumPendingTokenPos
+)
+
+var ErrInvalidSubjectFormat = errors.New("invalid format of ACK subject")
+
+// Quick parser for positive numbers in ack reply encoding.
+// NOTE: This parser does not detect uint64 overflow
+func ParseNum(d string) (n uint64) {
+	if len(d) == 0 {
+		return 0
+	}
+
+	// ASCII numbers 0-9
+	const (
+		asciiZero = 48
+		asciiNine = 57
+	)
+
+	for _, dec := range d {
+		if dec < asciiZero || dec > asciiNine {
+			return 0
+		}
+		n = n*10 + uint64(dec) - asciiZero
+	}
+	return
+}
+
+func GetMetadataFields(subject string) ([]string, error) {
+	v1TokenCounts, v2TokenCounts := 9, 12
+
+	var start int
+	tokens := make([]string, 0, v2TokenCounts)
+	for i := 0; i < len(subject); i++ {
+		if subject[i] == '.' {
+			tokens = append(tokens, subject[start:i])
+			start = i + 1
+		}
+	}
+	tokens = append(tokens, subject[start:])
+	//
+	// Newer server will include the domain name and account hash in the subject,
+	// and a token at the end.
+	//
+	// Old subject was:
+	// $JS.ACK.<stream>.<consumer>.<delivered>.<sseq>.<cseq>.<tm>.<pending>
+	//
+	// New subject would be:
+	// $JS.ACK.<domain>.<account hash>.<stream>.<consumer>.<delivered>.<sseq>.<cseq>.<tm>.<pending>.<a token with a random value>
+	//
+	// v1 has 9 tokens, v2 has 12, but we must not be strict on the 12th since
+	// it may be removed in the future. Also, the library has no use for it.
+	// The point is that a v2 ACK subject is valid if it has at least 11 tokens.
+	//
+	tokensLen := len(tokens)
+	// If lower than 9 or more than 9 but less than 11, report an error
+	if tokensLen < v1TokenCounts || (tokensLen > v1TokenCounts && tokensLen < v2TokenCounts-1) {
+		return nil, ErrInvalidSubjectFormat
+	}
+	if tokens[0] != "$JS" || tokens[1] != "ACK" {
+		return nil, fmt.Errorf("%w: subject should start with $JS.ACK", ErrInvalidSubjectFormat)
+	}
+	// For v1 style, we insert 2 empty tokens (domain and hash) so that the
+	// rest of the library references known fields at a constant location.
+	if tokensLen == v1TokenCounts {
+		// Extend the array (we know the backend is big enough)
+		tokens = append(tokens[:AckDomainTokenPos+2], tokens[AckDomainTokenPos:]...)
+		// Clear the domain and hash tokens
+		tokens[AckDomainTokenPos], tokens[AckAccHashTokenPos] = "", ""
+
+	} else if tokens[AckDomainTokenPos] == "_" {
+		// If domain is "_", replace with empty value.
+		tokens[AckDomainTokenPos] = ""
+	}
+	return tokens, nil
+}