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package main
// TODO: have logs go somewhere useful, like email
import (
"flag"
"log"
"os"
"path/filepath"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3/s3manager"
"github.com/aws/aws-sdk-go/service/sqs"
)
// 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
}
var verboselog *log.Logger
type fileWalk chan string
func (f fileWalk) Walk(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if !info.IsDir() {
f <- path
}
return nil
}
func main() {
verbose := flag.Bool("v", false, "Verbose")
flag.Parse()
if flag.NArg() < 1 {
log.Fatal("Usage: booktopipeline [-v] bookdir [bookname]\n\nUploads the book in bookdir to the S3 'inprogress' bucket and adds it to the 'preprocess' SQS queue\nIf bookname is omitted the last part of the bookdir is used\n")
}
bookdir := flag.Arg(0)
var bookname string
if flag.NArg() > 2 {
bookname = flag.Arg(1)
} else {
bookname = filepath.Base(bookdir)
}
if *verbose {
verboselog = log.New(os.Stdout, "", log.LstdFlags)
} else {
var n NullWriter
verboselog = log.New(n, "", log.LstdFlags)
}
verboselog.Println("Setting up AWS session")
sess, err := session.NewSession(&aws.Config{
Region: aws.String("eu-west-2"),
})
if err != nil {
log.Fatalln("Error: failed to set up aws session:", err)
}
sqssvc := sqs.New(sess)
uploader := s3manager.NewUploader(sess)
qname := "rescribepreprocess"
verboselog.Println("Getting Queue URL for", qname)
result, err := sqssvc.GetQueueUrl(&sqs.GetQueueUrlInput{
QueueName: aws.String(qname),
})
if err != nil {
log.Fatalln("Error getting queue URL for", qname, ":", err)
}
qurl := *result.QueueUrl
// concurrent walking upload based on example at
// https://docs.aws.amazon.com/sdk-for-go/v1/developer-guide/sdk-utilities.html
verboselog.Println("Walking", bookdir)
walker := make(fileWalk)
go func() {
err = filepath.Walk(bookdir, walker.Walk)
if err != nil {
log.Fatalln("Filesystem walk failed:", err)
}
close(walker)
}()
for path := range walker {
verboselog.Println("Uploading", path)
name := filepath.Base(path)
file, err := os.Open(path)
if err != nil {
log.Fatalln("Open file", path, "failed:", err)
}
defer file.Close()
_, err = uploader.Upload(&s3manager.UploadInput{
Bucket: aws.String("rescribeinprogress"),
Key: aws.String(filepath.Join(bookname, name)),
Body: file,
})
if err != nil {
log.Fatalln("Failed to upload", path, err)
}
}
verboselog.Println("Sending message", bookname, "to queue", qurl)
_, err = sqssvc.SendMessage(&sqs.SendMessageInput{
MessageBody: aws.String(bookname),
QueueUrl: &qurl,
})
if err != nil {
log.Fatalln("Error adding book to queue:", err)
}
}
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