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builder.go
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builder.go
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/*
Copyright 2023.
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 utils
import (
"context"
"crypto/rand"
"encoding/base64"
"encoding/binary"
"io"
"strconv"
"strings"
"time"
v1 "github.com/labring/sealos/controllers/pkg/notification/api/v1"
"sigs.k8s.io/controller-runtime/pkg/client"
)
type Kind string
const (
General Kind = "General"
Admin Kind = "Admin"
)
const (
GeneralPrefix = "ns-" // general notification prefix
)
const (
idLength = 12
letterBytes = "abcdefghijklmnopqrstuvwxyz0123456789"
)
// Receiver is the struct that contains the notification information.
type Receiver struct {
context.Context
client.Client
receivers []string
}
func NewReceiver(ctx context.Context, client client.Client) *Receiver {
return &Receiver{
Context: ctx,
Client: client,
}
}
func (rv *Receiver) AddReceiver(receiver string) *Receiver {
rv.receivers = append(rv.receivers, receiver)
return rv
}
// Cache of the NamespaceCache caches the namespaces in the cluster
// categorized by filters.
func (rv *Receiver) AddReceivers(receivers []string) *Receiver {
rv.receivers = append(rv.receivers, receivers...)
return rv
}
// NotificationPackage is the struct that contains the notification information.
type NoticeEventQueue struct {
Events []Event
}
// AddToEvents adds the notification to the provided NoticeEventQueue.
func (nb *Builder) AddToEventQueue(neq *NoticeEventQueue) {
neq.Events = append(neq.Events, Event{
ID: RandStrings(idLength),
Title: nb.Title,
From: nb.From,
Message: nb.Message,
Level: nb.Level,
Kind: nb.Kind,
})
}
// Event is the struct that contains the notification information.
type Event struct {
// ID is the unique ID of the notification.
ID string
Title string
From string
Message string
Kind Kind
Level v1.Type
}
// Builder is the struct that contains the notification information.
type Builder struct {
Kind Kind
Title string
From string
Message string
Level v1.Type
}
func (nb *Builder) WithTitle(title string) *Builder {
nb.Title = title
return nb
}
func (nb *Builder) WithFrom(from string) *Builder {
nb.From = from
return nb
}
func (nb *Builder) WithMessage(message string) *Builder {
nb.Message = message
return nb
}
func (nb *Builder) WithLevel(Level v1.Type) *Builder {
nb.Level = Level
return nb
}
func (nb *Builder) WithType(kind Kind) *Builder {
nb.Kind = kind
return nb
}
/*
NewNotificationEvent creates a new NotificationEvent with the provided title, message, kind, sender (from), and optional severity level.
Parameters:
- title: The title of the notification.
- message: The message content of the notification.
- kind: The kind of the notification (e.g., General, Personal, Admin).
- from: The sender of the notification.
- level: The optional severity level of the notification.
- target: An optional parameter specifying the intended recipient(s) of the notification. If provided, the notification will be directed towards these targets.
Return values:
- A NotificationEvent struct populated with the provided values and a unique ID generated for this notification.
- An error object if the provided level exceeds 1, in which case an error message "level parameter cannot exceed 1" will be returned.
The function also generates a unique ID for each NotificationEvent. If the generation of the ID fails, it uses the current Unix timestamp as the ID.
*/
func NewNotificationEvent(title string, message string, kind Kind, from string, level v1.Type) Event {
id, err := randStringBytes(idLength)
if err != nil || id == "" {
id = strings.ToLower(strconv.Itoa(int(time.Now().Unix())))
}
return Event{
ID: id,
Title: title,
Message: message,
From: from,
Kind: kind,
Level: level,
}
}
func RandStrings(n int) string {
str, err := randStringBytes(n)
if err != nil || str == "" {
str = encodeTime()
}
return str
}
func randStringBytes(n int) (string, error) {
bytes := make([]byte, n)
if _, err := io.ReadFull(rand.Reader, bytes); err != nil {
return "", err
}
for i, b := range bytes {
bytes[i] = letterBytes[b%byte(len(letterBytes))]
}
return string(bytes), nil
}
// encodeTime encodes current Unix timestamp to a base64 string
func encodeTime() string {
current := time.Now().Unix()
buf := make([]byte, 8)
binary.BigEndian.PutUint64(buf, uint64(current))
return base64.StdEncoding.EncodeToString(buf)
}