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recordio.go
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recordio.go
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package main
import (
"errors"
"github.com/thomasjungblut/go-sstables/_examples/proto"
"github.com/thomasjungblut/go-sstables/recordio"
rProto "github.com/thomasjungblut/go-sstables/recordio/proto"
"io"
"log"
"os"
)
func main() {
path := "/tmp/some_file.snap"
defer os.Remove(path)
simpleWrite(path)
simpleRead(path)
simpleReadAtOffset(path)
}
func simpleRead(path string) {
reader, err := rProto.NewProtoReaderWithPath(path)
if err != nil {
log.Fatalf("error: %v", err)
}
err = reader.Open()
if err != nil {
log.Fatalf("error: %v", err)
}
for {
record := &proto.HelloWorld{}
_, err := reader.ReadNext(record)
// io.EOF signals that no records are left to be read
if errors.Is(err, io.EOF) {
break
}
if err != nil {
log.Fatalf("error: %v", err)
}
log.Printf("%s", record.GetMessage())
}
err = reader.Close()
if err != nil {
log.Fatalf("error: %v", err)
}
}
func simpleWrite(path string) {
writer, err := rProto.NewWriter(rProto.Path(path), rProto.CompressionType(recordio.CompressionTypeSnappy))
if err != nil {
log.Fatalf("error: %v", err)
}
err = writer.Open()
if err != nil {
log.Fatalf("error: %v", err)
}
record := &proto.HelloWorld{Message: "Hello World"}
recordOffset, err := writer.Write(record)
if err != nil {
log.Fatalf("error: %v", err)
}
log.Printf("wrote a record at offset of %d bytes", recordOffset)
err = writer.Close()
if err != nil {
log.Fatalf("error: %v", err)
}
}
func simpleReadAtOffset(path string) {
reader, err := rProto.NewMMapProtoReaderWithPath(path)
if err != nil {
log.Fatalf("error: %v", err)
}
err = reader.Open()
if err != nil {
log.Fatalf("error: %v", err)
}
record := &proto.HelloWorld{}
_, err = reader.ReadNextAt(record, 8)
if err != nil {
log.Fatalf("error: %v", err)
}
log.Printf("Reading message at offset 8: %s", record.GetMessage())
err = reader.Close()
if err != nil {
log.Fatalf("error: %v", err)
}
}