func doRead(ctx context.Context, args ...string) {
if len(args) < 1 {
log.Fatalf("usage: cbt read <table> [args ...]")
}
tbl := getClient().Open(args[0])
parsed := make(map[string]string)
for _, arg := range args[1:] {
i := strings.Index(arg, "=")
if i < 0 {
log.Fatalf("Bad arg %q", arg)
}
key, val := arg[:i], arg[i+1:]
switch key {
default:
log.Fatalf("Unknown arg key %q", key)
case "limit":
// Be nicer; we used to support this, but renamed it to "end".
log.Fatalf("Unknown arg key %q; did you mean %q?", key, "end")
case "start", "end", "prefix", "count":
parsed[key] = val
}
}
if (parsed["start"] != "" || parsed["end"] != "") && parsed["prefix"] != "" {
log.Fatal(`"start"/"end" may not be mixed with "prefix"`)
}
var rr bigtable.RowRange
if start, end := parsed["start"], parsed["end"]; end != "" {
rr = bigtable.NewRange(start, end)
} else if start != "" {
rr = bigtable.InfiniteRange(start)
}
if prefix := parsed["prefix"]; prefix != "" {
rr = bigtable.PrefixRange(prefix)
}
var opts []bigtable.ReadOption
if count := parsed["count"]; count != "" {
n, err := strconv.ParseInt(count, 0, 64)
if err != nil {
log.Fatalf("Bad count %q: %v", count, err)
}
opts = append(opts, bigtable.LimitRows(n))
}
// TODO(dsymonds): Support filters.
err := tbl.ReadRows(ctx, rr, func(r bigtable.Row) bool {
printRow(r)
return true
}, opts...)
if err != nil {
log.Fatalf("Reading rows: %v", err)
}
}
func main() {
flag.Usage = func() {
fmt.Printf("Usage: scantest [options] <table_name>\n\n")
flag.PrintDefaults()
}
var err error
config, err = cbtconfig.Load()
if err != nil {
log.Fatal(err)
}
config.RegisterFlags()
flag.Parse()
if err := config.CheckFlags(cbtconfig.ProjectAndInstanceRequired); err != nil {
log.Fatal(err)
}
if config.Creds != "" {
os.Setenv("GOOGLE_APPLICATION_CREDENTIALS", config.Creds)
}
if flag.NArg() != 1 {
flag.Usage()
os.Exit(1)
}
table := flag.Arg(0)
log.Printf("Dialing connections...")
client, err = bigtable.NewClient(context.Background(), config.Project, config.Instance)
if err != nil {
log.Fatalf("Making bigtable.Client: %v", err)
}
defer client.Close()
log.Printf("Starting scan test... (run for %v)", *runFor)
tbl := client.Open(table)
sem := make(chan int, *numScans) // limit the number of requests happening at once
var scans stats
stopTime := time.Now().Add(*runFor)
var wg sync.WaitGroup
for time.Now().Before(stopTime) {
sem <- 1
wg.Add(1)
go func() {
defer wg.Done()
defer func() { <-sem }()
ok := true
opStart := time.Now()
defer func() {
scans.Record(ok, time.Since(opStart))
}()
// Start at a random row key
key := fmt.Sprintf("user%d", rand.Int63())
limit := bigtable.LimitRows(int64(*rowLimit))
noop := func(bigtable.Row) bool { return true }
if err := tbl.ReadRows(context.Background(), bigtable.NewRange(key, ""), noop, limit); err != nil {
log.Printf("Error during scan: %v", err)
ok = false
}
}()
}
wg.Wait()
agg := stat.NewAggregate("scans", scans.ds, scans.tries-scans.ok)
log.Printf("Scans (%d ok / %d tries):\nscan times:\n%v\nthroughput (rows/second):\n%v",
scans.ok, scans.tries, agg, throughputString(agg))
}