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package main
import (
"bufio"
"flag"
"fmt"
"io"
"os"
"path/filepath"
"sync"
"github.com/linkedin/goavro/v2"
)
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 [file1.avro [file2.avro [file3.avro]]]\n", base)
fmt.Fprintf(os.Stderr, "\tWhen filename is hyphen, %s will read from its standard input.\n", base)
flag.PrintDefaults()
os.Exit(2)
}
func main() {
args := os.Args[1:]
if len(args) == 0 {
usage()
}
for _, arg := range args {
if arg == "-" {
stat, err := os.Stdin.Stat()
if err != nil {
bail(err)
}
if (stat.Mode() & os.ModeCharDevice) != 0 {
usage()
}
if err = dumpFromReader(os.Stdin); err != nil {
bail(err)
}
if err = os.Stdin.Close(); err != nil {
bail(err)
}
continue
}
fh, err := os.Open(arg)
if err != nil {
bail(err)
}
if err := dumpFromReader(bufio.NewReader(fh)); err != nil {
bail(err)
}
if err := fh.Close(); err != nil {
bail(err)
}
}
}
func dumpFromReader(ior io.Reader) error {
ocf, err := goavro.NewOCFReader(ior)
if err != nil {
return err
}
codec := ocf.Codec()
data := make(chan interface{}, 100)
finishedOutput := new(sync.WaitGroup)
finishedOutput.Add(1)
go textualFromNative(codec, data, finishedOutput)
for ocf.Scan() {
datum, err := ocf.Read()
if err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err)
continue
}
data <- datum
}
close(data)
finishedOutput.Wait()
return ocf.Err()
}
func textualFromNative(codec *goavro.Codec, data <-chan interface{}, finishedOutput *sync.WaitGroup) {
for datum := range data {
buf, err := codec.TextualFromNative(nil, datum)
if err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err)
continue
}
fmt.Println(string(buf))
}
finishedOutput.Done()
}
func bail(err error) {
fmt.Fprintf(os.Stderr, "%s\n", err)
os.Exit(1)
}
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