Small go program to extract EXIF data from images. Build for Waldo Photos.

Interface for reading and parsing EXIF tags from an image file. Implementation depends on what you need. For now there is a S3Reader that can read images from a relative URL, given the base URL.

Usage:

reader := newS3Reader("http://s3.amazonaws.com/waldo-recruiting")
tags, err := reader.ReadAndParse("0003b8d6-d2d8-4436-a398-eab8d696f0f9.68cccdd4-e431-457d-8812-99ab561bf867.jpg")

Interface for listing images from a base location. Could be an URL or a file path. For now there is the S3Lister implementation expects the ListBucketResult XML format and parses the Key tag from the Content tags.

Usage:

lister := newS3Lister("http://s3.amazonaws.com/waldo-recruiting")
urls, err := lister.List()

Interface for storing images and there EXIF data. First implementation is the BoltStorage implementation. It is possible to Save and Search for images. With the Search method a SQL like syntax is possible, i.e. %test% returns all photos that contain the keyword test in the file name.

Usage:

s, err := newBoltStorage()
if err != nil {
  t.Fatalf("Can't create Bolt storage!")
}
defer s.Close()

s.Save("test.jpg", map[string]string{"Make": "Apple"})
photos := s.Search("test%") // returns a slice containing one pointer to a Photo struct

The component that glues every thing together. First it lists all the photos from a Lister component (S3 bucket). Then it reads and parses the EXIF tags using a Reader, and then is stores the photo and their tags in to a Storage engine, i.e. BoltStorage.

This is used to display the photos including the meta data and search them.

When the first part was finished I tried to made the indexing faster. Indexing the 129 photos with one Reader took 53.864118121s.

With the current structure it is possible to make the Readers concurrent in a workerpool, after doing this and enabling 4 workers, the indexing took 14.55569812s

1. Install GO (brew install go)
2. Get the package go get github.com/ajdevries/indicia
3. Build it cd $GOPATH/src/github.com/ajdevries/indicia and go build
4. Start it ./indicia
5. Open browser http://localhost:9000