example for protobuf, go, and the repeated protobuf entry

bdr_proto.proto

package bdr_proto;

message request {
	message blob {
		required string hash = 1; // the sha256 checksum of the blob
		required int32  size = 2; // the size of the blob 
	}
	repeated blob blobs = 1;
}

test.go

package main

import (
    "./bdr_proto"
    "crypto/sha256"
    "fmt"
)

//import M "math/rand"
import C "crypto/rand"

func main() {
    req := &bdr_proto.Request{}
    for i := 0; i < 32; i++ {
        // read in 16 bytes from /dev/urandom to sha256
        randBytes := make([]byte, 16)
        C.Read(randBytes)

        // get its size
        size := int32(len(randBytes))

        // create a new hash, and do a crypty hash of the random bytes.
        sha := sha256.New()
        sha.Write(randBytes)
        strhash := fmt.Sprintf("%x", sha.Sum(nil))
        fmt.Printf("i=%d sha=%x size=%d\n", i,strhash,size)
        
        req.Blobarray = append(req.Blobarray, &bdr_proto.RequestBlob{Sha256: &strhash, Bsize: &size})
    }
    fmt.Printf("%#V %T\n", req, req)
}