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utils.go
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utils.go
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package utils
import (
"bufio"
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"os"
"regexp"
"strings"
"time"
"cloud.google.com/go/storage"
"github.com/olekukonko/tablewriter"
"github.com/schollz/progressbar/v3"
)
var (
remoteFileRegex = regexp.MustCompile(`(?P<Scheme>\w+)://(?P<Bucket>[a-z0-9_.-]+)/(?P<Filename>.*)`)
)
func GetScheme(filename string) (match1 string, match2 string, match3 string) {
match := remoteFileRegex.FindStringSubmatch(filename)
if len(match) == 0 {
return "", "", filename
}
return match[1], match[2], match[3]
}
func ReadingStdin() (bool, error) {
stat, err := os.Stdin.Stat()
if err != nil {
return false, err
}
return stat.Mode()&os.ModeCharDevice == 0, nil
}
func StdoutRedirected() bool {
if fi, _ := os.Stdout.Stat(); (fi.Mode() & os.ModeCharDevice) == os.ModeCharDevice {
return false
}
return true
}
func GetReader(ctx context.Context, filename string) (func() error, io.ReadSeekCloser, error) {
var rs io.ReadSeekCloser
var err error
closeReader := func() error { return nil }
scheme, bucket, path := GetScheme(filename)
if scheme != "" {
switch scheme {
case "gs":
client, err := storage.NewClient(ctx)
if err != nil {
return closeReader, nil, fmt.Errorf("failed to create GCS client: %w", err)
}
closeReader = client.Close
object := client.Bucket(bucket).Object(path)
rs, err = NewGCSReadSeekCloser(ctx, object)
if err != nil {
return closeReader, nil, fmt.Errorf("failed to build read seek closer: %w", err)
}
default:
return closeReader, nil, fmt.Errorf("unsupported remote file scheme: %s", scheme)
}
} else {
rs, err = os.Open(path)
if err != nil {
return nil, nil, fmt.Errorf("failed to open local file")
}
}
return closeReader, rs, nil
}
func WithReader(ctx context.Context, filename string, f func(remote bool, rs io.ReadSeeker) error) error {
var err error
var rs io.ReadSeekCloser
var remote bool
scheme, bucket, path := GetScheme(filename)
if scheme != "" {
remote = true
switch scheme {
case "gs":
client, err := storage.NewClient(ctx)
if err != nil {
return fmt.Errorf("failed to create GCS client: %w", err)
}
object := client.Bucket(bucket).Object(path)
rs, err = NewGCSReadSeekCloser(ctx, object)
if err != nil {
return fmt.Errorf("failed to build read seek closer: %w", err)
}
default:
return fmt.Errorf("unsupported remote file scheme: %s", scheme)
}
} else {
rs, err = os.Open(path)
if err != nil {
return fmt.Errorf("failed to open local file")
}
}
defer rs.Close()
return f(remote, rs)
}
func FormatTable(w io.Writer, rows [][]string) {
buf := &bytes.Buffer{}
tw := tablewriter.NewWriter(buf)
tw.SetBorder(false)
tw.SetAutoWrapText(false)
tw.SetAlignment(tablewriter.ALIGN_LEFT)
tw.SetHeaderAlignment(tablewriter.ALIGN_LEFT)
tw.SetColumnSeparator("")
tw.AppendBulk(rows)
tw.Render()
// This tablewriter puts a leading space on the lines for some reason, so
// remove it.
scanner := bufio.NewScanner(buf)
for scanner.Scan() {
fmt.Fprintln(w, strings.TrimLeft(scanner.Text(), " "))
}
}
func Keys[T any](m map[string]T) []string {
keys := []string{}
for k := range m {
keys = append(keys, k)
}
return keys
}
func PrettyJSON(data []byte) (string, error) {
indented := &bytes.Buffer{}
err := json.Indent(indented, data, "", " ")
if err != nil {
return "", err
}
return indented.String(), nil
}
// DefaultString returns the first of the provided strings that is nonempty, or
// an empty string if they are all empty.
func DefaultString(strings ...string) string {
for _, s := range strings {
if s != "" {
return s
}
}
return ""
}
// NewProgressBar returns an instance of progressbar.ProgresBar.
// `max` is the denominator of the progress.
func NewProgressBar(max int64) *progressbar.ProgressBar {
return progressbar.NewOptions64(
max,
progressbar.OptionThrottle(65*time.Millisecond),
progressbar.OptionSetWriter(os.Stderr),
progressbar.OptionSetWidth(10),
progressbar.OptionOnCompletion(func() {
fmt.Fprint(os.Stderr, "\n")
}),
progressbar.OptionFullWidth(),
progressbar.OptionSetRenderBlankState(true),
)
}