init

go-gost/x/internal/loader/redis.go

@@ -0,0 +1,242 @@
+package loader
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"strings"
+
+	"github.com/go-redis/redis/v8"
+)
+
+const (
+	DefaultRedisKey = "gost"
+)
+
+type redisLoaderOptions struct {
+	db       int
+	username string
+	password string
+	key      string
+}
+
+type RedisLoaderOption func(opts *redisLoaderOptions)
+
+func DBRedisLoaderOption(db int) RedisLoaderOption {
+	return func(opts *redisLoaderOptions) {
+		opts.db = db
+	}
+}
+
+func UsernameRedisLoaderOption(username string) RedisLoaderOption {
+	return func(opts *redisLoaderOptions) {
+		opts.username = username
+	}
+}
+
+func PasswordRedisLoaderOption(password string) RedisLoaderOption {
+	return func(opts *redisLoaderOptions) {
+		opts.password = password
+	}
+}
+
+func KeyRedisLoaderOption(key string) RedisLoaderOption {
+	return func(opts *redisLoaderOptions) {
+		opts.key = key
+	}
+}
+
+type redisStringLoader struct {
+	client *redis.Client
+	key    string
+}
+
+// RedisStringLoader loads data from redis string.
+func RedisStringLoader(addr string, opts ...RedisLoaderOption) Loader {
+	var options redisLoaderOptions
+	for _, opt := range opts {
+		if opt != nil {
+			opt(&options)
+		}
+	}
+
+	key := options.key
+	if key == "" {
+		key = DefaultRedisKey
+	}
+
+	return &redisStringLoader{
+		client: redis.NewClient(&redis.Options{
+			Addr:     addr,
+			Password: options.password,
+			DB:       options.db,
+		}),
+		key: key,
+	}
+}
+
+func (p *redisStringLoader) Load(ctx context.Context) (io.Reader, error) {
+	v, err := p.client.Get(ctx, p.key).Bytes()
+	if err != nil {
+		return nil, err
+	}
+	return bytes.NewReader(v), nil
+}
+
+func (p *redisStringLoader) Close() error {
+	return p.client.Close()
+}
+
+type redisSetLoader struct {
+	client *redis.Client
+	key    string
+}
+
+// RedisSetLoader loads data from redis set.
+func RedisSetLoader(addr string, opts ...RedisLoaderOption) Loader {
+	var options redisLoaderOptions
+	for _, opt := range opts {
+		if opt != nil {
+			opt(&options)
+		}
+	}
+
+	key := options.key
+	if key == "" {
+		key = DefaultRedisKey
+	}
+
+	return &redisSetLoader{
+		client: redis.NewClient(&redis.Options{
+			Addr:     addr,
+			Password: options.password,
+			DB:       options.db,
+		}),
+		key: key,
+	}
+}
+
+func (p *redisSetLoader) Load(ctx context.Context) (io.Reader, error) {
+	v, err := p.List(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return bytes.NewReader([]byte(strings.Join(v, "\n"))), nil
+}
+
+// List implements Lister interface{}
+func (p *redisSetLoader) List(ctx context.Context) ([]string, error) {
+	return p.client.SMembers(ctx, p.key).Result()
+}
+
+func (p *redisSetLoader) Close() error {
+	return p.client.Close()
+}
+
+type redisListLoader struct {
+	client *redis.Client
+	key    string
+}
+
+// RedisListLoader loads data from redis list.
+func RedisListLoader(addr string, opts ...RedisLoaderOption) Loader {
+	var options redisLoaderOptions
+	for _, opt := range opts {
+		opt(&options)
+	}
+
+	key := options.key
+	if key == "" {
+		key = DefaultRedisKey
+	}
+
+	return &redisListLoader{
+		client: redis.NewClient(&redis.Options{
+			Addr:     addr,
+			Password: options.password,
+			DB:       options.db,
+		}),
+		key: key,
+	}
+}
+
+func (p *redisListLoader) Load(ctx context.Context) (io.Reader, error) {
+	v, err := p.List(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return bytes.NewReader([]byte(strings.Join(v, "\n"))), nil
+}
+
+// List implements Lister interface{}
+func (p *redisListLoader) List(ctx context.Context) ([]string, error) {
+	return p.client.LRange(ctx, p.key, 0, -1).Result()
+}
+
+func (p *redisListLoader) Close() error {
+	return p.client.Close()
+}
+
+type redisHashLoader struct {
+	client *redis.Client
+	key    string
+}
+
+// RedisHashLoader loads data from redis hash.
+func RedisHashLoader(addr string, opts ...RedisLoaderOption) Loader {
+	var options redisLoaderOptions
+	for _, opt := range opts {
+		opt(&options)
+	}
+
+	key := options.key
+	if key == "" {
+		key = DefaultRedisKey
+	}
+
+	return &redisHashLoader{
+		client: redis.NewClient(&redis.Options{
+			Addr:     addr,
+			Password: options.password,
+			DB:       options.db,
+		}),
+		key: key,
+	}
+}
+
+func (p *redisHashLoader) Load(ctx context.Context) (io.Reader, error) {
+	m, err := p.Map(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	var b strings.Builder
+	for k, v := range m {
+		fmt.Fprintf(&b, "%s %s\n", k, v)
+	}
+	return bytes.NewBufferString(b.String()), nil
+}
+
+// List implements Lister interface{}
+func (p *redisHashLoader) List(ctx context.Context) (list []string, err error) {
+	m, err := p.Map(ctx)
+	if err != nil {
+		return
+	}
+
+	for k, v := range m {
+		list = append(list, fmt.Sprintf("%s %s", k, v))
+	}
+
+	return
+}
+
+// Map implements Mapper interface{}
+func (p *redisHashLoader) Map(ctx context.Context) (map[string]string, error) {
+	return p.client.HGetAll(ctx, p.key).Result()
+}
+
+func (p *redisHashLoader) Close() error {
+	return p.client.Close()
+}