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client.go
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client.go
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package redisPriorityQueue
import (
"context"
"fmt"
"github.com/go-redis/redis/v8"
)
// RedisQueueClient Interface for RedisQueueClient,use generics to support different types of data
type RedisQueueClient[T any] interface {
// PushOne Push an item to the queue
PushOne(ctx context.Context, data T, priority int, key string) error
// BatchPush Push a batch of items to the queue, use lua script to ensure atomicity and efficiency
BatchPush(ctx context.Context, priority int, key string, data []T) error
// PopOne Pop a message from the queue, use lua script to ensure atomicity and efficiency
PopOne(ctx context.Context, key string, v *T) error
// BatchPop Pop a batch of messages from the queue, use lua script to ensure atomicity and efficiency
BatchPop(ctx context.Context, key string, count int, vs []*T) error
// Sub Subscribe to the queue, return a channel to receive messages, use lua script to ensure atomicity and efficiency
// every time poll we peek all the messages in the queue and return the highest priority message
Sub(ctx context.Context, key string) (chan T, error)
// UnSub Unsubscribe from the queue
UnSub(ctx context.Context, key string) error
}
type redisQueueClient[T any] struct {
Serializer
logger Logger
client *redis.Client
messageQueue chan []byte
}
// NewRedisQueueClient Create a new RedisQueueClient
// Params:
// - ctx: context.Context
// - serializer: SerializerType, eg: SerializerJson
// - client: *redis.Client
// Return:
// - RedisQueueClient
func NewRedisQueueClient[T any](_ context.Context, serializer SerializerType, client *redis.Client) RedisQueueClient[T] {
return &redisQueueClient[T]{
Serializer: NewSerializer(serializer),
client: client,
}
}
// NewRedisQueueClientWithLogger Create a new RedisQueueClient with logger
// Params:
// - ctx: context.Context
// - serializer: SerializerType, eg: SerializerJson
// - client: *redis.Client
// - logger: Logger
// Return:
// - RedisQueueClient
func NewRedisQueueClientWithLogger[T any](_ context.Context, serializer SerializerType, client *redis.Client, logger Logger) RedisQueueClient[T] {
return &redisQueueClient[T]{
Serializer: NewSerializer(serializer),
client: client,
logger: logger,
}
}
func (r *redisQueueClient[T]) PushOne(ctx context.Context, data T, priority int, key string) error {
byteData, err := r.Serializer.Serialize(data)
if err != nil {
return err
}
script := redis.NewScript(ScriptPushOne)
// Run the Lua script
result, err := script.Run(ctx, r.client, []string{key}, priority, byteData).Result()
if err != nil {
return err
}
r.log("PushOne result: %v", result)
return nil
}
func (r *redisQueueClient[T]) BatchPush(ctx context.Context, priority int, key string, data []T) error {
// Convert data to byte slice, and insert priority before each data
// eg. data = []string{"Alice", "Bob", "Charlie"} => args = []interface{}{priority, []byte{1, 65, 108, 105, 99, 101}, priority, []byte{1, 66, 111, 98}, priority, []byte{1, 67, 104, 97, 114, 108, 105, 101}}
var args []interface{}
for _, v := range data {
b, err := r.Serializer.Serialize(v)
if err != nil {
return err
}
args = append(args, priority, b)
}
script := redis.NewScript(ScriptBatchPush)
// Run the Lua script
result, err := script.Run(ctx, r.client, []string{key}, args...).Result()
if err != nil {
return err
}
r.log("BatchPush result: %v", result)
return nil
}
func (r *redisQueueClient[T]) PopOne(ctx context.Context, key string, v *T) error {
script := redis.NewScript(ScriptPopOne)
// Run the Lua script
results, err := script.Run(ctx, r.client, []string{key}, 0, "+inf").Slice()
if err != nil {
return err
}
// Check if the result is empty
if len(results) == 0 {
return fmt.Errorf("result is empty")
}
r.log("PopOne result: %v", results[0])
// Deserialize the message
return r.Serializer.Deserialize([]byte(results[0].(string)), &v)
}
// BatchPop ...
// Params:
// - ctx: context.Context
// - key: string
// - count: int
// - vs: []*T, should be a pointer to a array, eg: []*string{}
func (r *redisQueueClient[T]) BatchPop(ctx context.Context, key string, count int, vs []*T) error {
script := redis.NewScript(ScriptBatchPop)
// Run the Lua script
results, err := script.Run(ctx, r.client, []string{key}, 0, "+inf", count).Slice()
if err != nil {
return err
}
// Check if the result is empty
if len(results) == 0 {
return fmt.Errorf("result is empty")
}
r.log("BatchPop results: %v", results)
for i, result := range results {
// Deserialize the message
if err = r.Serializer.Deserialize([]byte(result.(string)), &vs[i]); err != nil {
return err
}
}
return nil
}
func (r *redisQueueClient[T]) Sub(ctx context.Context, key string) (chan T, error) {
//TODO implement me
panic("implement me")
}
func (r *redisQueueClient[T]) UnSub(ctx context.Context, key string) error {
//TODO implement me
panic("implement me")
}
func (r *redisQueueClient[T]) log(format string, args ...interface{}) {
if r.logger != nil {
switch r.logger.GetLevel() {
case Info:
r.logger.Info(format, args...)
case Error:
r.logger.Error(format, args...)
case Debug:
r.logger.Debug(format, args...)
case Trace:
r.logger.Trace(format, args...)
default:
}
}
}