mirror of
https://github.com/optim-enterprises-bv/kubernetes.git
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118 lines
2.9 KiB
Go
118 lines
2.9 KiB
Go
/*
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Copyright 2023 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package knftables
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import (
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"fmt"
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"strconv"
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"strings"
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)
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// PtrTo can be used to fill in optional field values in objects
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func PtrTo[T any](val T) *T {
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return &val
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}
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var numericPriorities = map[string]int{
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"raw": -300,
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"mangle": -150,
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"dstnat": -100,
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"filter": 0,
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"security": 50,
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"srcnat": 100,
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}
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var bridgeNumericPriorities = map[string]int{
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"dstnat": -300,
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"filter": -200,
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"out": 100,
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"srcnat": 300,
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}
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// ParsePriority tries to convert the string form of a chain priority into a number
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func ParsePriority(family Family, priority string) (int, error) {
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val, err := strconv.Atoi(priority)
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if err == nil {
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return val, nil
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}
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modVal := 0
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if i := strings.IndexAny(priority, "+-"); i != -1 {
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mod := priority[i:]
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modVal, err = strconv.Atoi(mod)
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if err != nil {
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return 0, fmt.Errorf("could not parse modifier %q: %w", mod, err)
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}
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priority = priority[:i]
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}
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var found bool
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if family == BridgeFamily {
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val, found = bridgeNumericPriorities[priority]
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} else {
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val, found = numericPriorities[priority]
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}
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if !found {
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return 0, fmt.Errorf("unknown priority %q", priority)
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}
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return val + modVal, nil
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}
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// Concat is a helper (primarily) for constructing Rule objects. It takes a series of
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// arguments and concatenates them together into a single string with spaces between the
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// arguments. Strings are output as-is, string arrays are output element by element,
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// numbers are output as with `fmt.Sprintf("%d")`, and all other types are output as with
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// `fmt.Sprintf("%s")`. To help with set/map lookup syntax, an argument of "@" will not
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// be followed by a space, so you can do, eg, `Concat("ip saddr", "@", setName)`.
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func Concat(args ...interface{}) string {
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b := &strings.Builder{}
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var needSpace, wroteAt bool
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for _, arg := range args {
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switch x := arg.(type) {
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case string:
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if needSpace {
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b.WriteByte(' ')
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}
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b.WriteString(x)
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wroteAt = (x == "@")
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case []string:
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for _, s := range x {
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if needSpace {
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b.WriteByte(' ')
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}
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b.WriteString(s)
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wroteAt = (s == "@")
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needSpace = b.Len() > 0 && !wroteAt
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}
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case int, uint, int16, uint16, int32, uint32, int64, uint64:
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if needSpace {
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b.WriteByte(' ')
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}
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fmt.Fprintf(b, "%d", x)
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default:
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if needSpace {
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b.WriteByte(' ')
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}
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fmt.Fprintf(b, "%s", x)
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}
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needSpace = b.Len() > 0 && !wroteAt
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}
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return b.String()
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}
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