64 lines
1.4 KiB
Go
64 lines
1.4 KiB
Go
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package dao
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import (
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"context"
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"fmt"
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"go-common/library/cache/memcache"
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"go-common/library/log"
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)
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const (
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_partitionKey = "p_%s_%d"
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)
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// pingMC ping memcache.
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func (d *Dao) pingMC(ctx context.Context) (err error) {
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conn := d.mc.Get(ctx)
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defer conn.Close()
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if err = conn.Set(&memcache.Item{Key: "ping", Value: []byte{1}, Expiration: 0}); err != nil {
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log.Error("conn.Store(set,ping,1) error(%v)", err)
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}
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return
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}
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func partitionCacheKey(e string, p int32) string {
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return fmt.Sprintf(_partitionKey, e, p)
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}
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// OffsetCache .
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func (d *Dao) OffsetCache(ctx context.Context, event string, p int32) (offset int64, err error) {
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var (
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key = partitionCacheKey(event, p)
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conn = d.mc.Get(ctx)
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)
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defer conn.Close()
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reply, err := conn.Get(key)
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if err != nil {
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if err == memcache.ErrNotFound {
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err = nil
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return
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}
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log.Error("conn.Get(get,%d) error(%v)", p, err)
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return
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}
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if err = conn.Scan(reply, &offset); err != nil {
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log.Error("reply.Scan(%s) error(%v)", string(reply.Value), err)
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}
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return
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}
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// SetOffsetCache .
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func (d *Dao) SetOffsetCache(ctx context.Context, event string, p int32, offset int64) (err error) {
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var (
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key = partitionCacheKey(event, p)
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conn = d.mc.Get(ctx)
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)
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defer conn.Close()
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if err = conn.Set(&memcache.Item{Key: key, Object: offset, Expiration: 0, Flags: memcache.FlagJSON}); err != nil {
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log.Error("conn.Set(%s,%d) error(%v)", key, offset, err)
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}
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return
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}
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