// Dial dials the local Redis server and selects database 9. To prevent
// stomping on real data, DialTestDB fails if database 9 contains data. The
// returned connection flushes database 9 on close.
func Dial() (redis.Conn, error) {
c, err := redis.DialTimeout("tcp", ":6379", 0, 1*time.Second, 1*time.Second)
if err != nil {
return nil, err
}
_, err = c.Do("SELECT", "9")
if err != nil {
c.Close()
return nil, err
}
n, err := redis.Int(c.Do("DBSIZE"))
if err != nil {
c.Close()
return nil, err
}
if n != 0 {
c.Close()
return nil, errors.New("database #9 is not empty, test can not continue")
}
return testConn{c}, nil
}
func ExampleInt() {
c, err := dial()
if err != nil {
panic(err)
}
defer c.Close()
c.Do("SET", "k1", 1)
n, _ := redis.Int(c.Do("GET", "k1"))
fmt.Printf("%#v\n", n)
n, _ = redis.Int(c.Do("INCR", "k1"))
fmt.Printf("%#v\n", n)
// Output:
// 1
// 2
}
// GetVoteComics returns two comics that should face off against each other in
// a vote-duel. One comic is chosen randomly, the other is approximately chosen
// from the 1% least voted-on comics.
func GetVoteComics() (c1, c2 Comic, err error) {
C := pool.Get()
defer C.Close()
var (
candidates []string
votes int
)
candidates, err = redis.Strings(C.Do("SRANDMEMBER", "strips", 100))
if err != nil {
return
}
// Choose one comic at random (this is needed because Redis' SRANDMEMBER
// function isn't random enough)
idx := rand.Intn(len(candidates))
c1, err = GetComic(candidates[idx])
if err != nil {
return
}
// Remove the chosen comic from the rotation, so we don't duel a comic
// against itself
candidates[idx] = candidates[len(candidates)-1]
candidates = candidates[:len(candidates)-1]
// Find the comic with the least totalvotes among the remaining candidates
minVotes := 1<<31 - 1
bestStrip := ""
for _, strip := range candidates {
votes, err = redis.Int(C.Do("HGET", fmt.Sprintf(stripsFmt, strip), "totalvotes"))
if votes < minVotes {
bestStrip = strip
minVotes = votes
}
}
c2, err = GetComic(bestStrip)
if err != nil {
return
}
return
}
// GetPage returns the contents of the requested page number
func GetPage(page string) (List, error) {
C := pool.Get()
defer C.Close()
p, err := strconv.Atoi(page)
if err != nil || p < 1 {
return List{}, errors.New("invalid page: " + page)
}
comics, err := redis.Strings(C.Do("ZREVRANGE", "ranked", (p-1)*pageSize, (p-1)*pageSize+pageSize-1))
if err != nil {
return List{}, errors.New("could not retrieve comics for page " + page)
}
if len(comics) == 0 {
return List{}, errors.New("invalid page: " + page)
}
numPages := 0
numComics, err := redis.Int(C.Do("SCARD", "strips"))
if err != nil {
numPages = p
} else {
numPages = numComics / pageSize
if numComics%pageSize != 0 {
numPages++
}
}
result := List{
CurPage: p,
LastPage: numPages,
ListStart: (p-1)*pageSize + 1,
Comics: make([]Comic, 0, pageSize),
}
for _, c := range comics {
comic, err := GetComic(c)
if err == nil {
result.Comics = append(result.Comics, comic)
}
}
return result, nil
}
func TestDialURL(t *testing.T) {
for _, d := range dialErrors {
_, err := redis.DialURL(d.rawurl)
if err == nil || !strings.Contains(err.Error(), d.expectedError) {
t.Errorf("DialURL did not return expected error (expected %v to contain %s)", err, d.expectedError)
}
}
checkPort := func(network, address string) (net.Conn, error) {
if address != "localhost:6379" {
t.Errorf("DialURL did not set port to 6379 by default (got %v)", address)
}
return net.Dial(network, address)
}
c, err := redis.DialURL("redis://localhost", redis.DialNetDial(checkPort))
if err != nil {
t.Error("dial error:", err)
}
c.Close()
checkHost := func(network, address string) (net.Conn, error) {
if address != "localhost:6379" {
t.Errorf("DialURL did not set host to localhost by default (got %v)", address)
}
return net.Dial(network, address)
}
c, err = redis.DialURL("redis://:6379", redis.DialNetDial(checkHost))
if err != nil {
t.Error("dial error:", err)
}
c.Close()
// Check that the database is set correctly
c1, err := redis.DialURL("redis://:6379/8")
defer c1.Close()
if err != nil {
t.Error("Dial error:", err)
}
dbSize, _ := redis.Int(c1.Do("DBSIZE"))
if dbSize > 0 {
t.Fatal("DB 8 has existing keys; aborting test to avoid overwriting data")
}
c1.Do("SET", "var", "val")
c2, err := redis.Dial("tcp", ":6379")
defer c2.Close()
if err != nil {
t.Error("dial error:", err)
}
_, err = c2.Do("SELECT", "8")
if err != nil {
t.Error(err)
}
got, err := redis.String(c2.Do("GET", "var"))
if err != nil {
t.Error(err)
}
if got != "val" {
t.Error("DialURL did not correctly set the db.")
}
_, err = c2.Do("DEL", "var")
}
