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package main
import (
"flag"
"fmt"
"io"
"os"
"path/filepath"
"github.com/linkedin/goavro/v2"
)
var (
showCount = flag.Bool("count", false, "show count of data items")
showSchema = flag.Bool("schema", false, "show data schema")
)
func usage() {
executable, err := os.Executable()
if err != nil {
executable = os.Args[0]
}
base := filepath.Base(executable)
fmt.Fprintf(os.Stderr, "Usage of %s:\n", base)
fmt.Fprintf(os.Stderr, "\t%s [-count] [-schema] [file1.avro...]\n", base)
fmt.Fprintf(os.Stderr, "\tAs a special case, when there are no filename arguments, %s will read\n", base)
fmt.Fprintf(os.Stderr, "\tfrom its standard input.\n")
flag.PrintDefaults()
os.Exit(2)
}
func main() {
flag.Parse()
args := flag.Args()
if len(args) == 0 {
stat, err := os.Stdin.Stat()
if err != nil {
bail(err)
}
if (stat.Mode() & os.ModeCharDevice) != 0 {
usage()
}
if err := headerFromReader(os.Stdin, ""); err != nil {
bail(err)
}
}
for _, arg := range args {
fh, err := os.Open(arg)
if err != nil {
bail(err)
}
if len(args) > 1 {
arg += ": "
} else {
arg = ""
}
if err := headerFromReader(fh, arg); err != nil {
bail(err)
}
if err := fh.Close(); err != nil {
bail(err)
}
}
}
func headerFromReader(ior io.Reader, prefix string) error {
ocfr, err := goavro.NewOCFReader(ior)
if err != nil {
return err
}
fmt.Printf("%sCompression Algorithm (avro.codec): %q\n", prefix, ocfr.CompressionName())
if *showSchema {
fmt.Printf("%sSchema (avro.schema):\n%s\n", prefix, ocfr.Codec().Schema())
}
if !*showCount {
return nil
}
var decoded, errors int
for ocfr.Scan() {
_, err := ocfr.Read()
if err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err)
errors++
continue
}
decoded++
}
if decoded > 0 {
fmt.Printf("%sSuccessfully decoded: %d\n", prefix, decoded)
}
if errors > 0 {
fmt.Printf("%sCannot decode: %d\n", prefix, errors)
}
return ocfr.Err()
}
func bail(err error) {
fmt.Fprintf(os.Stderr, "%s\n", err)
os.Exit(1)
}
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