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// skate-conv converts various schemas into releases. This should replace the
// very specific skate-ref-to-release and the like.
//
// $ skate-conv -f ref < FILE > FILE
//
// Currently source schemas: "ref", "ol", "rg"
package main
import (
"flag"
"log"
"os"
"runtime"
"strings"
"git.archive.org/martin/cgraph/skate"
"git.archive.org/martin/cgraph/skate/parallel"
json "github.com/segmentio/encoding/json"
)
var (
numWorkers = flag.Int("w", runtime.NumCPU(), "number of workers")
batchSize = flag.Int("b", 100000, "batch size")
fromFormat = flag.String("f", "ref", "import schema: ref, rg, ol")
f func([]byte) ([]byte, error) // our converter function
)
func main() {
flag.Parse()
switch *fromFormat {
case "ref":
f = refToRelease
case "rg":
f = rgSitemapToRelease
case "ol":
f = openLibraryToRelease
default:
log.Fatal("unsupported input schema: %v", *fromFormat)
}
pp := parallel.NewProcessor(os.Stdin, os.Stdout, f)
pp.NumWorkers = *numWorkers
pp.BatchSize = *batchSize
if err := pp.Run(); err != nil {
log.Fatal(err)
}
}
// refToRelease converts a ref document to a release. The standard conversion
// plus some extra fields.
func refToRelease(p []byte) ([]byte, error) {
var (
ref skate.Ref
release *skate.Release
err error
)
if err = json.Unmarshal(p, &ref); err != nil {
return nil, err
}
if release, err = skate.RefToRelease(&ref); err != nil {
return nil, err
}
release.Extra.Skate.Status = "ref" // means: converted from ref
release.Extra.Skate.Ref.Index = ref.Index
release.Extra.Skate.Ref.Key = ref.Key
return skate.JsonMarshalNewline(release)
}
// rgSitemapToRelease converts a simple sitemap to a release entity, e.g. from
// https://archive.org/download/rg_sitemap_2021_02_23/rg_sitemap_2021_02_23.ndj.zst.
func rgSitemapToRelease(p []byte) ([]byte, error) {
var (
s skate.Sitemap
release skate.Release
err error
)
if err = json.Unmarshal(p, &s); err != nil {
return nil, err
}
release.Title = s.Title
if len(s.URL) > 41 {
// A pseudo ident, maybe irritating; we want the "321885388".
// https://www.researchgate.net/publication/321885388_We_came_here_on_dif
release.Ident = strings.Split(s.URL[41:], "_")[0]
}
release.Extra.Skate.Status = "rg"
release.Extra.Skate.ResearchGate.URL = s.URL
return skate.JsonMarshalNewline(release)
}
// openLibraryToRelease converts an Open Library work item to a release.
func openLibraryToRelease(p []byte) ([]byte, error) {
var (
w skate.OpenLibraryWork
release *skate.Release
err error
)
if err = json.Unmarshal(p, &w); err != nil {
return nil, err
}
if release, err = skate.OpenLibraryToRelease(&w); err != nil {
return nil, err
}
release.Extra.Skate.Status = "ol"
return skate.JsonMarshalNewline(release)
}
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