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// This file is part of gnunet-go, a GNUnet-implementation in Golang.
// Copyright (C) 2019-2022 Bernd Fix >Y<
//
// gnunet-go is free software: you can redistribute it and/or modify it
// under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License,
// or (at your option) any later version.
//
// gnunet-go is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// SPDX-License-Identifier: AGPL3.0-or-later
package util
import (
"encoding/hex"
"encoding/json"
"strings"
"github.com/bfix/gospel/data"
"github.com/bfix/gospel/math"
)
//----------------------------------------------------------------------
// Count occurrence of multiple instance at the same time.
//----------------------------------------------------------------------
// Counter is a metric with single key
type Counter[T comparable] map[T]int
// Add one to themetric for a given key and return current value
func (cm Counter[T]) Add(i T) int {
count, ok := cm[i]
if !ok {
count = 1
} else {
count++
}
cm[i] = count
return count
}
// Num returns the metric for a given key
func (cm Counter[T]) Num(i T) int {
count, ok := cm[i]
if !ok {
count = 0
}
return count
}
//----------------------------------------------------------------------
// Parameter set with string keys and variable value types
//----------------------------------------------------------------------
// ParameterSet with string keys and variable value types
type ParameterSet map[string]any
// Get a parameter value with given type 'V'
func GetParam[V any](params ParameterSet, key string) (i V, ok bool) {
var v any
if v, ok = params[key]; ok {
if i, ok = v.(V); ok {
return
}
}
return
}
//----------------------------------------------------------------------
// additional helpers
//----------------------------------------------------------------------
// Distance returns the XOR distance between to byte arrays
func Distance(a, b []byte) *math.Int {
size := len(a)
d := make([]byte, size)
for i := range d {
d[i] = a[i] ^ b[i]
}
return math.NewIntFromBytes(d)
}
// StripPathRight returns a dot-separated path without
// its last (right-most) element.
func StripPathRight(s string) string {
if idx := strings.LastIndex(s, "."); idx != -1 {
return s[:idx]
}
return s
}
// Shorten string for output
func Shorten(s string, n int) string {
l := len(s)
p := n - 3
if p < 3 {
return s
}
k := p % 2
p /= 2
return s[:p+k] + "..." + s[l-p:]
}
// Dump instance
func Dump(obj any, format string) string {
switch format {
case "json":
buf, err := json.Marshal(obj)
if err != nil {
return err.Error()
}
return string(buf)
case "hex":
buf, err := data.Marshal(obj)
if err != nil {
return err.Error()
}
return hex.EncodeToString(buf)
}
return "unknown message dump format"
}
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