cmd/mbf: check for updates concurrently

Runs much faster this way.

Signed-off-by: Ophestra <cat@gensokyo.uk>

cmd/mbf/main.go

@@ -12,6 +12,8 @@ import (
 	"runtime"
 	"strconv"
 	"strings"
+	"sync"
+	"sync/atomic"
 	"syscall"
 	"time"
 	"unique"
@@ -265,32 +267,72 @@ func main() {
 		},
 	)
 
-	c.NewCommand("updates", command.UsageInternal, func([]string) error {
-		var n int
-		for i := range rosa.PresetEnd {
-			p := rosa.PArtifact(i)
-			meta := rosa.GetMetadata(p)
-			if meta.ID == 0 {
-				continue
+	{
+		var flagJobs int
+		c.NewCommand("updates", command.UsageInternal, func([]string) error {
+			var (
+				errsMu sync.Mutex
+				errs   []error
+
+				n atomic.Uint64
+			)
+
+			w := make(chan rosa.PArtifact)
+			var wg sync.WaitGroup
+			for range max(flagJobs, 1) {
+				wg.Go(func() {
+					for p := range w {
+						meta := rosa.GetMetadata(p)
+						if meta.ID == 0 {
+							continue
+						}
+
+						v, err := meta.GetVersions(ctx)
+						if err != nil {
+							errsMu.Lock()
+							errs = append(errs, err)
+							errsMu.Unlock()
+							continue
+						}
+
+						if current, latest :=
+							rosa.Std.Version(p),
+							meta.GetLatest(v); current != latest {
+
+							n.Add(1)
+							log.Printf("%s %s < %s", meta.Name, current, latest)
+							continue
+						}
+
+						msg.Verbosef("%s is up to date", meta.Name)
+					}
+				})
 			}
 
-			if v, err := meta.GetVersions(ctx); err != nil {
-				return err
-			} else if current, latest :=
-				rosa.Std.Version(p),
-				meta.GetLatest(v); current != latest {
-				n++
-				log.Printf("%s %s < %s", meta.Name, current, latest)
-			} else {
-				msg.Verbosef("%s is up to date", meta.Name)
+		done:
+			for i := range rosa.PresetEnd {
+				select {
+				case w <- rosa.PArtifact(i):
+					break
+				case <-ctx.Done():
+					break done
+				}
 			}
-		}
+			close(w)
+			wg.Wait()
 
-		if n > 0 {
-			return errors.New(strconv.Itoa(n) + " packages are out of date")
-		}
-		return nil
-	})
+			if v := n.Load(); v > 0 {
+				errs = append(errs, errors.New(strconv.Itoa(int(v))+
+					" package(s) are out of date"))
+			}
+			return errors.Join(errs...)
+		}).
+			Flag(
+				&flagJobs,
+				"j", command.IntFlag(32),
+				"Maximum number of simultaneous connections",
+			)
+	}
 
 	{
 		var (
@@ -565,6 +607,16 @@ func main() {
 		if cache != nil {
 			cache.Close()
 		}
-		log.Fatal(err)
+		if w, ok := err.(interface{ Unwrap() []error }); !ok {
+			log.Fatal(err)
+		} else {
+			errs := w.Unwrap()
+			for i, e := range errs {
+				if i == len(errs)-1 {
+					log.Fatal(e)
+				}
+				log.Println(e)
+			}
+		}
 	})
 }