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fetch.go
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fetch.go
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package main
import (
"context"
"encoding/binary"
"io"
"os"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
"google.golang.org/protobuf/proto"
v1 "mkm.pub/binlog/proto"
)
type FetchCmd struct {
Source string `required:"" help:"address of a Source gRPC server"`
Origin string `optional:""`
TraceID string `required:""`
}
func (cmd *FetchCmd) Run(cli *Context) error {
ctx := context.Background()
client, err := grpc.DialContext(ctx, cmd.Source, grpc.WithTransportCredentials(insecure.NewCredentials()))
if err != nil {
return err
}
reader := v1.NewLogReaderServiceClient(client)
req := &v1.ReadRequest{
Origin: cmd.Origin,
TraceId: cmd.TraceID,
}
res, err := reader.Read(ctx, req)
if err != nil {
return err
}
w := os.Stdout
for {
r, err := res.Recv()
if err == io.EOF {
break
} else if err != nil {
return err
}
b, err := proto.Marshal(r.Entry)
if err != nil {
return err
}
if err := binary.Write(w, binary.BigEndian, uint32(len(b))); err != nil {
return err
}
if _, err := w.Write(b); err != nil {
return err
}
}
return nil
}