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// Copyright 2020 Nick White.
// Use of this source code is governed by the GPLv3
// license that can be found in the LICENSE file.
// getsamplepages downloads sample pages from each book in a
// set of OCRed books
package main
import (
"flag"
"fmt"
"io/ioutil"
"log"
"os"
"strings"
"rescribe.xyz/bookpipeline"
)
const usage = `Usage: getsamplepages [-prefix prefix]
Downloads a sample page hocr and image from each book in a set
of OCRed books. These can then be used for various testing,
statistics, and so on.
`
// null writer to enable non-verbose logging to be discarded
type NullWriter bool
func (w NullWriter) Write(p []byte) (n int, err error) {
return len(p), nil
}
type Pipeliner interface {
Init() error
ListObjectPrefixes(bucket string) ([]string, error)
ListObjects(bucket string, prefix string) ([]string, error)
Download(bucket string, key string, fn string) error
WIPStorageId() string
}
func main() {
prefix := flag.String("prefix", "", "Only select books with this prefix (e.g. '17' for 18th century books)")
flag.Usage = func() {
fmt.Fprintf(flag.CommandLine.Output(), usage)
flag.PrintDefaults()
}
flag.Parse()
var n NullWriter
verboselog := log.New(n, "", log.LstdFlags)
var conn Pipeliner
conn = &bookpipeline.AwsConn{Region: "eu-west-2", Logger: verboselog}
err := conn.Init()
if err != nil {
log.Fatalln("Error setting up cloud connection:", err)
}
fmt.Println("Getting list of all books")
prefixes, err := conn.ListObjectPrefixes(conn.WIPStorageId())
if err != nil {
log.Fatalln("Failed to get list of books", err)
}
for _, p := range prefixes {
if *prefix != "" && !strings.HasPrefix(p, *prefix) {
continue
}
name := strings.Split(p, "/")[0]
err = conn.Download(conn.WIPStorageId(), p+"best", name+"best")
if err != nil {
}
b, err := ioutil.ReadFile(name + "best")
if err != nil {
log.Fatalf("Failed to read file %s\n", name+"best")
}
lines := strings.SplitN(string(b), "\n", 2)
if len(lines) == 1 {
fmt.Printf("No pages found for %s, skipping\n", name)
continue
}
pg := strings.TrimSuffix(lines[0], ".hocr")
err = os.Remove(name + "best")
if err != nil {
log.Fatalf("Failed to remove temporary best file for %s", name)
}
fmt.Printf("Downloading page %s from %s\n", pg, name)
for _, suffix := range []string{".png", ".hocr"} {
fn := pg + suffix
err = conn.Download(conn.WIPStorageId(), p+fn, name+fn)
if err != nil {
log.Fatalf("Download of %s%s failed: %v\n", p+fn, err)
}
}
}
}
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