demo.go

// usage: go run demo.go OR go run demo.go <number>
package main

import (
	"os"
	"fmt"
	netUrl "net/url"
	fb "github.com/huandu/facebook"
)

const ACCESS_TOKEN = "<get one here https://developers.facebook.com/tools/explorer>"

type Post struct {
	Id string `facebook:",required"`
	Message string
	CreatedTime string
}

type Paging struct {
	Previous, Next string
}

func processPosts (url string, total int) int {
	fmt.Println(url)
	res, err := fb.Get(url, fb.Params{
		"access_token": ACCESS_TOKEN,
	})

	if (err != nil) {
		panic(err)
	}

	var posts []Post
	var paging Paging
	res.DecodeField("data", &posts)
	res.DecodeField("paging", &paging)

	if (len(posts) == 0) {
		return total
	}

	u, _ := netUrl.Parse(paging.Next)
	path_without_version_prefix := u.Path[len("/v2.0"):]
	next := path_without_version_prefix + "?" + u.RawQuery
	return processPosts(next, total + len(posts))

}

func main () {
	fb.Version = "v2.0"
	limit := "25"
	if (len(os.Args) > 1 ) {
		limit = os.Args[1]
	}
	total := processPosts("/163844093817909/feed?fields=created_time&limit=" + limit, 0)
	fmt.Println("Total was", total);
}