func ExampleScanSlice() {
c, err := dial()
if err != nil {
fmt.Println(err)
return
}
defer c.Close()
c.Send("HMSET", "album:1", "title", "Red", "rating", 5)
c.Send("HMSET", "album:2", "title", "Earthbound", "rating", 1)
c.Send("HMSET", "album:3", "title", "Beat", "rating", 4)
c.Send("LPUSH", "albums", "1")
c.Send("LPUSH", "albums", "2")
c.Send("LPUSH", "albums", "3")
values, err := redis.Values(c.Do("SORT", "albums",
"BY", "album:*->rating",
"GET", "album:*->title",
"GET", "album:*->rating"))
if err != nil {
fmt.Println(err)
return
}
var albums []struct {
Title string
Rating int
}
if err := redis.ScanSlice(values, &albums); err != nil {
fmt.Println(err)
return
}
fmt.Printf("%v\n", albums)
// Output:
// [{Earthbound 1} {Beat 4} {Red 5}]
}
func TestBlankCommmand(t *testing.T) {
c, err := redistest.Dial()
if err != nil {
t.Fatalf("error connection to database, %v", err)
}
defer c.Close()
for _, cmd := range testCommands {
if err := c.Send(cmd.args[0].(string), cmd.args[1:]...); err != nil {
t.Fatalf("Send(%v) returned error %v", cmd.args, err)
}
}
reply, err := redis.Values(c.Do(""))
if err != nil {
t.Fatalf("Do() returned error %v", err)
}
if len(reply) != len(testCommands) {
t.Fatalf("len(reply)=%d, want %d", len(reply), len(testCommands))
}
for i, cmd := range testCommands {
actual := reply[i]
if !reflect.DeepEqual(actual, cmd.expected) {
t.Errorf("Receive(%v) = %v, want %v", cmd.args, actual, cmd.expected)
}
}
}
func ExampleArgs() {
c, err := dial()
if err != nil {
fmt.Println(err)
return
}
defer c.Close()
var p1, p2 struct {
Title string `redis:"title"`
Author string `redis:"author"`
Body string `redis:"body"`
}
p1.Title = "Example"
p1.Author = "Gary"
p1.Body = "Hello"
if _, err := c.Do("HMSET", redis.Args{}.Add("id1").AddFlat(&p1)...); err != nil {
fmt.Println(err)
return
}
m := map[string]string{
"title": "Example2",
"author": "Steve",
"body": "Map",
}
if _, err := c.Do("HMSET", redis.Args{}.Add("id2").AddFlat(m)...); err != nil {
fmt.Println(err)
return
}
for _, id := range []string{"id1", "id2"} {
v, err := redis.Values(c.Do("HGETALL", id))
if err != nil {
fmt.Println(err)
return
}
if err := redis.ScanStruct(v, &p2); err != nil {
fmt.Println(err)
return
}
fmt.Printf("%+v\n", p2)
}
// Output:
// {Title:Example Author:Gary Body:Hello}
// {Title:Example2 Author:Steve Body:Map}
}
func c_redis_counters(server string, db int) (opentsdb.MultiDataPoint, error) {
var md opentsdb.MultiDataPoint
conn, err := redis.Dial("tcp", server, redis.DialDatabase(db))
if err != nil {
return md, err
}
defer conn.Close()
if _, err := conn.Do("CLIENT", "SETNAME", "scollector"); err != nil {
return md, err
}
cursor := 0
for {
vals, err := redis.Values(conn.Do("HSCAN", collect.RedisCountersKey, cursor))
if err != nil {
return md, err
}
if len(vals) != 2 {
return md, fmt.Errorf("Unexpected number of values")
}
cursor, err = redis.Int(vals[0], nil)
if err != nil {
return md, err
}
pairs, err := redis.StringMap(vals[1], nil)
if err != nil {
return md, err
}
for mts, val := range pairs {
parts := strings.Split(mts, ":")
if len(parts) != 2 {
slog.Errorf("Invalid metric tag set counter: %s", mts)
continue
}
metric := parts[0]
tags, err := opentsdb.ParseTags(parts[1])
if err != nil {
slog.Errorf("Invalid tags: %s", parts[1])
continue
}
v, err := strconv.Atoi(val)
if err != nil {
slog.Errorf("Invalid counter value: %s", val)
continue
}
Add(&md, metric, v, tags, metadata.Counter, metadata.Count, "")
}
if cursor == 0 {
break
}
}
return md, nil
}
func int64s(reply interface{}, err error) ([]int64, error) {
if err != nil {
return nil, slog.Wrap(err)
}
ints := []int64{}
values, err := redis.Values(reply, err)
if err != nil {
return ints, slog.Wrap(err)
}
if err := redis.ScanSlice(values, &ints); err != nil {
return ints, slog.Wrap(err)
}
return ints, nil
}
func (d *dataAccess) GetMetricMetadata(metric string) (*MetricMetadata, error) {
defer collect.StartTimer("redis", opentsdb.TagSet{"op": "GetMetricMeta"})()
conn := d.GetConnection()
defer conn.Close()
v, err := redis.Values(conn.Do("HGETALL", metricMetaKey(metric)))
if err != nil {
return nil, err
}
if len(v) == 0 {
return nil, nil
}
mm := &MetricMetadata{}
if err := redis.ScanStruct(v, mm); err != nil {
return nil, err
}
return mm, nil
}
func ExampleScan() {
c, err := dial()
if err != nil {
fmt.Println(err)
return
}
defer c.Close()
c.Send("HMSET", "album:1", "title", "Red", "rating", 5)
c.Send("HMSET", "album:2", "title", "Earthbound", "rating", 1)
c.Send("HMSET", "album:3", "title", "Beat")
c.Send("LPUSH", "albums", "1")
c.Send("LPUSH", "albums", "2")
c.Send("LPUSH", "albums", "3")
values, err := redis.Values(c.Do("SORT", "albums",
"BY", "album:*->rating",
"GET", "album:*->title",
"GET", "album:*->rating"))
if err != nil {
fmt.Println(err)
return
}
for len(values) > 0 {
var title string
rating := -1 // initialize to illegal value to detect nil.
values, err = redis.Scan(values, &title, &rating)
if err != nil {
fmt.Println(err)
return
}
if rating == -1 {
fmt.Println(title, "not-rated")
} else {
fmt.Println(title, rating)
}
}
// Output:
// Beat not-rated
// Earthbound 1
// Red 5
}
func (d *dataAccess) GetMetricTagSets(metric string, tags opentsdb.TagSet) (map[string]int64, error) {
defer collect.StartTimer("redis", opentsdb.TagSet{"op": "GetMetricTagSets"})()
conn := d.GetConnection()
defer conn.Close()
var cursor = "0"
result := map[string]int64{}
for {
vals, err := redis.Values(conn.Do(d.HSCAN(), searchMetricTagSetKey(metric), cursor))
if err != nil {
return nil, slog.Wrap(err)
}
cursor, err = redis.String(vals[0], nil)
if err != nil {
return nil, slog.Wrap(err)
}
mtss, err := stringInt64Map(vals[1], nil)
if err != nil {
return nil, slog.Wrap(err)
}
for mts, t := range mtss {
ts, err := opentsdb.ParseTags(mts)
if err != nil {
return nil, slog.Wrap(err)
}
if ts.Subset(tags) {
result[mts] = t
}
}
if cursor == "" || cursor == "0" {
break
}
}
return result, nil
}
// TextExecError tests handling of errors in a transaction. See
// http://redis.io/topics/transactions for information on how Redis handles
// errors in a transaction.
func TestExecError(t *testing.T) {
c, err := redistest.Dial()
if err != nil {
t.Fatalf("error connection to database, %v", err)
}
defer c.Close()
// Execute commands that fail before EXEC is called.
c.Do("ZADD", "k0", 0, 0)
c.Send("MULTI")
c.Send("NOTACOMMAND", "k0", 0, 0)
c.Send("ZINCRBY", "k0", 0, 0)
v, err := c.Do("EXEC")
if err == nil {
t.Fatalf("EXEC returned values %v, expected error", v)
}
// Execute commands that fail after EXEC is called. The first command
// returns an error.
c.Do("ZADD", "k1", 0, 0)
c.Send("MULTI")
c.Send("HSET", "k1", 0, 0)
c.Send("ZINCRBY", "k1", 0, 0)
v, err = c.Do("EXEC")
if err != nil {
t.Fatalf("EXEC returned error %v", err)
}
vs, err := redis.Values(v, nil)
if err != nil {
t.Fatalf("Values(v) returned error %v", err)
}
if len(vs) != 2 {
t.Fatalf("len(vs) == %d, want 2", len(vs))
}
if _, ok := vs[0].(error); !ok {
t.Fatalf("first result is type %T, expected error", vs[0])
}
if _, ok := vs[1].([]byte); !ok {
t.Fatalf("second result is type %T, expected []byte", vs[2])
}
// Execute commands that fail after EXEC is called. The second command
// returns an error.
c.Do("ZADD", "k2", 0, 0)
c.Send("MULTI")
c.Send("ZINCRBY", "k2", 0, 0)
c.Send("HSET", "k2", 0, 0)
v, err = c.Do("EXEC")
if err != nil {
t.Fatalf("EXEC returned error %v", err)
}
vs, err = redis.Values(v, nil)
if err != nil {
t.Fatalf("Values(v) returned error %v", err)
}
if len(vs) != 2 {
t.Fatalf("len(vs) == %d, want 2", len(vs))
}
if _, ok := vs[0].([]byte); !ok {
t.Fatalf("first result is type %T, expected []byte", vs[0])
}
if _, ok := vs[1].(error); !ok {
t.Fatalf("second result is type %T, expected error", vs[2])
}
}
ve(redis.Ints(nil, nil)),
ve([]int(nil), redis.ErrNil),
},
{
"strings([v1, v2])",
ve(redis.Strings([]interface{}{[]byte("v1"), []byte("v2")}, nil)),
ve([]string{"v1", "v2"}, nil),
},
{
"strings(nil)",
ve(redis.Strings(nil, nil)),
ve([]string(nil), redis.ErrNil),
},
{
"values([v1, v2])",
ve(redis.Values([]interface{}{[]byte("v1"), []byte("v2")}, nil)),
ve([]interface{}{[]byte("v1"), []byte("v2")}, nil),
},
{
"values(nil)",
ve(redis.Values(nil, nil)),
ve([]interface{}(nil), redis.ErrNil),
},
{
"float64(1.0)",
ve(redis.Float64([]byte("1.0"), nil)),
ve(float64(1.0), nil),
},
{
"float64(nil)",
ve(redis.Float64(nil, nil)),