// rebuildTable deletes the table if it exists, then creates the table, with the index column family.
func rebuildTable() error {
ctx, _ := context.WithTimeout(context.Background(), 5*time.Minute)
adminClient.DeleteTable(ctx, *tableName)
if err := adminClient.CreateTable(ctx, *tableName); err != nil {
return fmt.Errorf("CreateTable: %v", err)
}
time.Sleep(20 * time.Second)
if err := adminClient.CreateColumnFamily(ctx, *tableName, indexColumnFamily); err != nil {
return fmt.Errorf("CreateColumnFamily: %v", err)
}
if err := adminClient.CreateColumnFamily(ctx, *tableName, contentColumnFamily); err != nil {
return fmt.Errorf("CreateColumnFamily: %v", err)
}
// Open the prototype table. It contains a number of documents to get started with.
prototypeTable := client.Open(prototypeTableName)
var (
writeErr error // Set if any write fails.
mu sync.Mutex // Protects writeErr
wg sync.WaitGroup // Used to wait for all writes to finish.
)
copyRowToTable := func(row bigtable.Row) bool {
mu.Lock()
failed := writeErr != nil
mu.Unlock()
if failed {
return false
}
mut := bigtable.NewMutation()
for family, items := range row {
for _, item := range items {
// Get the column name, excluding the column family name and ':' character.
columnWithoutFamily := item.Column[len(family)+1:]
mut.Set(family, columnWithoutFamily, bigtable.Now(), item.Value)
}
}
wg.Add(1)
go func() {
// TODO: should use a semaphore to limit the number of concurrent writes.
if err := table.Apply(ctx, row.Key(), mut); err != nil {
mu.Lock()
writeErr = err
mu.Unlock()
}
wg.Done()
}()
return true
}
// Create a filter that only accepts the column families we're interested in.
filter := bigtable.FamilyFilter(indexColumnFamily + "|" + contentColumnFamily)
// Read every row from prototypeTable, and call copyRowToTable to copy it to our table.
err := prototypeTable.ReadRows(ctx, bigtable.InfiniteRange(""), copyRowToTable, bigtable.RowFilter(filter))
wg.Wait()
if err != nil {
return err
}
return writeErr
}
func doCount(ctx context.Context, args ...string) {
if len(args) != 1 {
log.Fatal("usage: cbt count <table>")
}
tbl := getClient().Open(args[0])
n := 0
err := tbl.ReadRows(ctx, bigtable.InfiniteRange(""), func(_ bigtable.Row) bool {
n++
return true
}, bigtable.RowFilter(bigtable.StripValueFilter()))
if err != nil {
log.Fatalf("Reading rows: %v", err)
}
fmt.Println(n)
}
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 "start", "limit", "prefix":
parsed[key] = val
}
}
if (parsed["start"] != "" || parsed["limit"] != "") && parsed["prefix"] != "" {
log.Fatal(`"start"/"limit" may not be mixed with "prefix"`)
}
var rr bigtable.RowRange
if start, limit := parsed["start"], parsed["limit"]; limit != "" {
rr = bigtable.NewRange(start, limit)
} else if start != "" {
rr = bigtable.InfiniteRange(start)
}
if prefix := parsed["prefix"]; prefix != "" {
rr = bigtable.PrefixRange(prefix)
}
// TODO(dsymonds): Support filters.
err := tbl.ReadRows(ctx, rr, func(r bigtable.Row) bool {
printRow(r)
return true
})
if err != nil {
log.Fatalf("Reading rows: %v", err)
}
}
