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/
token.go
166 lines (152 loc) · 4.72 KB
/
token.go
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package douyin
import (
"context"
"encoding/json"
"errors"
"fmt"
"strconv"
"time"
"github.com/go-leo/backoffx"
"github.com/go-leo/mapx"
"github.com/go-leo/netx/httpx"
"github.com/go-redsync/redsync/v4"
)
type TokenData struct {
AccessToken string `json:"access_token"` // string 获取到的凭证
ExpiresIn int64 `json:"expires_in"` // number 凭证有效时间,单位:秒
}
type TokenResp struct {
ErrNo int64 `json:"err_no"`
ErrTips string `json:"err_tips"`
Data *TokenData `json:"data"`
}
type TokenReq struct {
AppID string `json:"appid"`
Secret string `json:"secret"`
GrantType string `json:"grant_type"`
}
func (sdk *SDK) Token(ctx context.Context) (*TokenResp, error) {
// 从redis获取token信息,如果获取到了,判断expires_at是否在当前时间之后,如果是之后,则直接返回响应
// 其他情况需要获取分布式锁,获取到锁的话,就请求微信服务,获取新的token,并更新token,expires_at 设置成的 now+expires_in*(2/3)
// 没获取到锁的,返回响应(新老有5分钟的过度期)
result, err := sdk.RedisCli.HGetAll(ctx, sdk.TokenKey).Result()
if err != nil {
return nil, err
}
if mapx.IsNotEmpty(result) {
// 从缓存中获取到token信息
expiresAtTimestamp, _ := result["expires_at"]
timestamp, _ := strconv.ParseInt(expiresAtTimestamp, 10, 64)
expiresAt := time.Unix(timestamp, 0)
if expiresAt.After(time.Now()) {
// 没有过期,直接返回token信息
return sdk.DecodeTokenResp(result), nil
} else {
// 过期了,获取锁
mutex := sdk.RedisSync.NewMutex(sdk.TokenLockerKey)
err := mutex.Lock()
if err != nil {
// 获取锁失败,直接返回token信息
return sdk.DecodeTokenResp(result), nil
}
defer func(mutex *redsync.Mutex) {
_, _ = mutex.Unlock()
}(mutex)
// 获取锁成功, 调微信的接口
tokenResp, err := sdk.CallToken(ctx)
if err != nil {
sdk.Logger.Errorf("failed to get access token from wechat, %v", err)
return sdk.DecodeTokenResp(result), nil
}
// 保存到redis
if err := sdk.SaveTokenRespToRedis(ctx, tokenResp); err != nil {
sdk.Logger.Errorf("failed to save access token to redis, %v", err)
return tokenResp, nil
}
return tokenResp, nil
}
}
// 从缓存中没有获取到,第一次请求微信获取token
// 获取锁
mutex := sdk.RedisSync.NewMutex(
sdk.TokenLockerKey,
redsync.WithTries(3),
redsync.WithRetryDelayFunc(func(tries int) time.Duration {
return backoffx.Linear(50*time.Millisecond)(ctx, uint(tries))
}),
)
if err := mutex.Lock(); err != nil {
// 获取锁失败,在从redis中获取一次
result, err := sdk.RedisCli.HGetAll(ctx, sdk.TokenKey).Result()
if err != nil {
return nil, err
}
if mapx.IsEmpty(result) {
return nil, errors.New("failed to get access token")
}
return sdk.DecodeTokenResp(result), nil
}
defer func(mutex *redsync.Mutex) {
_, _ = mutex.Unlock()
}(mutex)
// 获取锁成功, 调微信的接口
tokenResp, err := sdk.CallToken(ctx)
if err != nil {
sdk.Logger.Errorf("failed to get access token from wechat, %v", err)
return sdk.DecodeTokenResp(result), nil
}
// 保存到redis
if err := sdk.SaveTokenRespToRedis(ctx, tokenResp); err != nil {
sdk.Logger.Errorf("failed to save access token to redis, %v", err)
return tokenResp, nil
}
return tokenResp, nil
}
func (sdk *SDK) SaveTokenRespToRedis(ctx context.Context, tokenResp *TokenResp) error {
data, _ := json.Marshal(tokenResp)
expiresIn := time.Duration(tokenResp.Data.ExpiresIn) * time.Second
expiresAt := time.Now().Add(expiresIn * 2 / 3)
_, err := sdk.RedisCli.HMSet(ctx, sdk.TokenKey, "resp", string(data), "expires_at", expiresAt.Unix()).Result()
if err != nil {
return err
}
_, err = sdk.RedisCli.Expire(ctx, sdk.TokenKey, expiresIn).Result()
if err != nil {
return err
}
return nil
}
func (sdk *SDK) DecodeTokenResp(result map[string]string) *TokenResp {
resp, _ := result["resp"]
tokenResp := &TokenResp{}
_ = json.Unmarshal([]byte(resp), tokenResp)
return tokenResp
}
func (sdk *SDK) CallToken(ctx context.Context) (*TokenResp, error) {
var req = TokenReq{
AppID: sdk.AppID,
Secret: sdk.Secret,
GrantType: "client_credential",
}
var resp TokenResp
err := httpx.NewRequestBuilder().
Post().
URLString(sdk.getURLToken()).
JSONBody(&req).
Execute(ctx, sdk.HttpCli).
JSONBody(&resp)
if err != nil {
return nil, err
}
if resp.ErrNo != 0 {
err = fmt.Errorf("token error : errcode=%v , errmsg=%v", resp.ErrNo, resp.ErrTips)
return nil, err
}
return &resp, nil
}
func (sdk *SDK) getURLToken() string {
if sdk.IsSandBox {
return "https://open-sandbox.douyin.com/api/apps/v2/token"
}
return "https://developer.toutiao.com/api/apps/v2/token"
}