Update github.com/bradfitz/gomemcache commit hash to a41fca8

go.mod

@@ -6,7 +6,7 @@ require (
 	git.autistici.org/ai3/go-common v0.0.0-20210110180225-a05c683cfe23
 	git.autistici.org/id/usermetadb v0.0.0-20210112103616-f674f50555fc
 	github.com/boombuler/barcode v0.0.0-20170618053812-56ef0af91246 // indirect
-	github.com/bradfitz/gomemcache v0.0.0-20180710155616-bc664df96737
+	github.com/bradfitz/gomemcache v0.0.0-20190913173617-a41fca850d0b
 	github.com/cenkalti/backoff v2.2.1+incompatible
 	github.com/coreos/go-systemd/v22 v22.1.0
 	github.com/go-ldap/ldap/v3 v3.2.4

go.sum

@@ -49,6 +49,8 @@ github.com/boombuler/barcode v0.0.0-20170618053812-56ef0af91246 h1:HrRyYatID4tDi
 github.com/boombuler/barcode v0.0.0-20170618053812-56ef0af91246/go.mod h1:paBWMcWSl3LHKBqUq+rly7CNSldXjb2rDl3JlRe0mD8=
 github.com/bradfitz/gomemcache v0.0.0-20180710155616-bc664df96737 h1:rRISKWyXfVxvoa702s91Zl5oREZTrR3yv+tXrrX7G/g=
 github.com/bradfitz/gomemcache v0.0.0-20180710155616-bc664df96737/go.mod h1:PmM6Mmwb0LSuEubjR8N7PtNe1KxZLtOUHtbeikc5h60=
+github.com/bradfitz/gomemcache v0.0.0-20190913173617-a41fca850d0b h1:L/QXpzIa3pOvUGt1D1lA5KjYhPBAN/3iWdP7xeFS9F0=
+github.com/bradfitz/gomemcache v0.0.0-20190913173617-a41fca850d0b/go.mod h1:H0wQNHz2YrLsuXOZozoeDmnHXkNCRmMW0gwFWDfEZDA=
 github.com/casbin/casbin/v2 v2.1.2/go.mod h1:YcPU1XXisHhLzuxH9coDNf2FbKpjGlbCg3n9yuLkIJQ=
 github.com/cenkalti/backoff v2.2.1+incompatible h1:tNowT99t7UNflLxfYYSlKYsBpXdEet03Pg2g16Swow4=
 github.com/cenkalti/backoff v2.2.1+incompatible/go.mod h1:90ReRw6GdpyfrHakVjL/QHaoyV4aDUVVkXQJJJ3NXXM=

vendor/github.com/bradfitz/gomemcache/memcache/memcache.go

@@ -112,6 +112,7 @@ var (
 	resultTouched   = []byte("TOUCHED\r\n")
 
 	resultClientErrorPrefix = []byte("CLIENT_ERROR ")
+	versionPrefix           = []byte("VERSION")
 )
 
 // New returns a memcache client using the provided server(s)
@@ -398,6 +399,30 @@ func (c *Client) flushAllFromAddr(addr net.Addr) error {
 	})
 }
 
+// ping sends the version command to the given addr
+func (c *Client) ping(addr net.Addr) error {
+	return c.withAddrRw(addr, func(rw *bufio.ReadWriter) error {
+		if _, err := fmt.Fprintf(rw, "version\r\n"); err != nil {
+			return err
+		}
+		if err := rw.Flush(); err != nil {
+			return err
+		}
+		line, err := rw.ReadSlice('\n')
+		if err != nil {
+			return err
+		}
+
+		switch {
+		case bytes.HasPrefix(line, versionPrefix):
+			break
+		default:
+			return fmt.Errorf("memcache: unexpected response line from ping: %q", string(line))
+		}
+		return nil
+	})
+}
+
 func (c *Client) touchFromAddr(addr net.Addr, keys []string, expiration int32) error {
 	return c.withAddrRw(addr, func(rw *bufio.ReadWriter) error {
 		for _, key := range keys {
@@ -644,6 +669,12 @@ func (c *Client) DeleteAll() error {
 	})
 }
 
+// Ping checks all instances if they are alive. Returns error if any
+// of them is down.
+func (c *Client) Ping() error {
+	return c.selector.Each(c.ping)
+}
+
 // Increment atomically increments key by delta. The return value is
 // the new value after being incremented or an error. If the value
 // didn't exist in memcached the error is ErrCacheMiss. The value in

vendor/modules.txt

@@ -24,7 +24,7 @@ github.com/beorn7/perks/quantile
 github.com/boombuler/barcode
 github.com/boombuler/barcode/qr
 github.com/boombuler/barcode/utils
-# github.com/bradfitz/gomemcache v0.0.0-20180710155616-bc664df96737
+# github.com/bradfitz/gomemcache v0.0.0-20190913173617-a41fca850d0b
 ## explicit
 github.com/bradfitz/gomemcache/memcache
 # github.com/cenkalti/backoff v2.2.1+incompatible