protoscan

README

protoscan

What is it?

Scenario: lets say you have a pbf struct where the an outer message is simply a repeated list of message like this in the protobuf file:

message FeatureCollection {
    repeated Feature Features = 1;
}

This file could have millions of features and you want to read each of them iteratively and more importantly not read the entire file in at one time to get each feature. This repository implements a simple api to output the byte array of each protobuf message using bufio.Scanner, Unmarshaling will be handled on your own of course.

Usage

The following example implements a made a protobuf where the 0 bytes represent a message and the 10 and the following bytes are size bytes. The first feature is > 4096 bytes to show how partial features are carried over.

package main

import (
    "github.com/murphy214/protoscan"
    "bytes"
    "fmt"
)


func main() {
    // 2 protobufs in this message
    input := 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    // scanner takes an io.Reader
    scanner := protoscan.NewProtobufScanner(bytes.NewReader(input))

    // scanner implemented exactly like bufio.Scanner
    for scanner.Scan() {
        // printing protobuf message
        fmt.Println(scanner.Protobuf())
    }
}

Documentation

Index

• Variables
• func DecodeVarint(buf []byte) int
• type ProtobufScanner
  • func NewProtobufScanner(ioreader io.Reader) *ProtobufScanner
  • func NewProtobufScannerSize(ioreader io.Reader, size_buffer int) *ProtobufScanner
  • func (scanner *ProtobufScanner) Get_Increment(step int) []byte
  • func (scanner *ProtobufScanner) Protobuf() []byte
  • func (scanner *ProtobufScanner) ProtobufIndicies() ([]byte, [2]int)
  • func (scanner *ProtobufScanner) Reset()
  • func (scanner *ProtobufScanner) Scan() bool

Variables

var SizeBuffer = 64 * 1028 // 64 kb

var SizeBufferLarge = 64 * 1028 * 1028 // 64 mb

Functions

func DecodeVarint

func DecodeVarint(buf []byte) int

generic decode var int for getting size

Types

type ProtobufScanner

type ProtobufScanner struct {
	Scanner        *bufio.Scanner
	BoolVal        bool
	EndBool        bool
	TotalPosition  int
	BufferPosition int

	SizeBuffer int
	// contains filtered or unexported fields
}

the main struct for this repo

func NewProtobufScanner

func NewProtobufScanner(ioreader io.Reader) *ProtobufScanner

new protobuf scanner

func NewProtobufScannerSize

func NewProtobufScannerSize(ioreader io.Reader, size_buffer int) *ProtobufScanner

protobuf scanner with size size

func (*ProtobufScanner) Get_Increment

func (scanner *ProtobufScanner) Get_Increment(step int) []byte

gets an increment

func (*ProtobufScanner) Protobuf

func (scanner *ProtobufScanner) Protobuf() []byte

func (*ProtobufScanner) ProtobufIndicies

func (scanner *ProtobufScanner) ProtobufIndicies() ([]byte, [2]int)

returns a [2]int of the file positionals within a protobuf

func (*ProtobufScanner) Reset

func (scanner *ProtobufScanner) Reset()

func (*ProtobufScanner) Scan

func (scanner *ProtobufScanner) Scan() bool

returns a continutation bool