cmd/msrfetch: save enriched compound data

This implementation of cmd/msrfetch is only temporary, used to fetch the
testdata. At this point we have all metadata present in the repo and all
that is left is to fetch the media.

Signed-off-by: Yonah <contrib@gensokyo.uk>

.gitignore

@@ -5,7 +5,7 @@
 *.so
 *.dylib
 *.pkg
-/monstersirenfetch
+/msrfetch
 
 # Test binary, built with `go test -c`
 *.test

cmd/msrfetch/main.go

@@ -0,0 +1,84 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"flag"
+	"log"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"git.gensokyo.uk/yonah/monstersirenfetch"
+)
+
+var (
+	flagAlbumsPath string
+	flagSongsPath  string
+	flagOutputPath string
+)
+
+func init() {
+	flag.StringVar(&flagAlbumsPath, "a", "albums.json",
+		"Path to file containing the response body of /api/albums")
+	flag.StringVar(&flagSongsPath, "s", "songs.json",
+		"Path to file containing the response body of /api/songs")
+	flag.StringVar(&flagOutputPath, "o", "composite.json",
+		"Path to write composite data")
+}
+
+func main() {
+	log.SetFlags(0)
+	log.SetPrefix("msrfetch: ")
+
+	var (
+		albumsResponse monstersirenfetch.AlbumsResponse
+		songsResponse  monstersirenfetch.SongsResponse
+	)
+	mustReadJSON(flagAlbumsPath, &albumsResponse)
+	mustReadJSON(flagSongsPath, &songsResponse)
+
+	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+	defer stop()
+
+	if c, err := monstersirenfetch.Flatten(albumsResponse.Data, songsResponse.Data); err != nil {
+		log.Fatal(err)
+	} else {
+		n := new(netDirect)
+		for _, ca := range c {
+			log.Printf("enriching album %s (%s)", ca.Name, ca.CID.String())
+			for _, cs := range ca.Songs {
+				if !cs.IsFull() {
+					if err = cs.Enrich(ctx, n); err != nil {
+						log.Fatal(err)
+					}
+					log.Printf("enriched song %s: %s (%s)", cs.CID.String(), cs.SourceURL, cs.Name)
+				} else {
+					log.Printf("skipped song %s: %s (%s)", cs.CID.String(), cs.SourceURL, cs.Name)
+				}
+			}
+		}
+		mustWriteJSON(flagOutputPath, c)
+		log.Println("composite data written to", flagOutputPath)
+	}
+}
+
+func mustWriteJSON(pathname string, v any) {
+	if w, err := os.Create(pathname); err != nil {
+		log.Fatal(err)
+	} else if err = monstersirenfetch.NewEncoder(w).Encode(v); err != nil {
+		log.Fatal(err)
+	} else if err = w.Close(); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func mustReadJSON(pathname string, v any) {
+	if r, err := os.OpenFile(pathname, os.O_RDONLY, 0); err != nil {
+		log.Fatal(err)
+	} else if err = json.NewDecoder(r).Decode(v); err != nil {
+		log.Fatal(err)
+	} else if err = r.Close(); err != nil {
+		log.Fatal(err)
+	}
+}

cmd/msrfetch/net.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"context"
+	"io"
+	"net/http"
+)
+
+type netDirect struct {
+	c http.Client
+}
+
+func (n *netDirect) Get(ctx context.Context, url string) (io.ReadCloser, error) {
+	var resp *http.Response
+	if req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil); err != nil {
+		return nil, err
+	} else if resp, err = n.c.Do(req); err != nil {
+		return nil, err
+	}
+	return resp.Body, nil
+}