Package Age() Update() Append()

packages.go

@@ -8,6 +8,9 @@ import (
 	"os"
 	"sort"
 	sync "sync"
+	"time"
+
+	timestamppb "google.golang.org/protobuf/types/known/timestamppb"
 )
 
 // bad global lock until I figure out some other plan
@@ -81,14 +84,50 @@ func (r *Packages) Append(newP *Package) bool {
 		}
 	}
 
-	r.Packages = append(r.Packages, newP) 
+	r.Packages = append(r.Packages, newP)
 	return true
 }
 
+// Update version and timestamp.
+// returns (ok, changed)
+func (r *Packages) Update(newP *Package) (bool, bool) {
+	lock.Lock()
+	defer lock.Unlock()
+
+	var found *Package
+	for _, p := range r.Packages {
+		if p.Name == newP.Name {
+			found = p
+		}
+	}
+	if found == nil {
+		// r.Append(newP) // update here?
+		return false, true
+	}
+
+	var changed bool = false
+	if newP.Version != found.Version {
+		changed = true
+		found.Version = newP.Version
+	}
+
+	now := time.Now()
+	found.Laststamp = timestamppb.New(now)
+
+	r.Packages = append(r.Packages, newP)
+	return true, changed
+}
+
+// returns time.Duration since last Update()
+func (r *Package) Age(newP *Package) time.Duration {
+	t := time.Since(r.Laststamp.AsTime())
+	return t
+}
+
 // find a package by name
 func (r *Packages) FindByName(name string) *Package {
-	lock.Lock()
+	lock.RLock()
-	defer lock.Unlock()
+	defer lock.RUnlock()
 
 	for _, p := range r.Packages {
 		if p.Name == name {
@@ -99,6 +138,13 @@ func (r *Packages) FindByName(name string) *Package {
 	return nil
 }
 
+func (r *Packages) Len() int {
+	lock.RLock()
+	defer lock.RUnlock()
+
+	return len(r.Packages)
+}
+
 type ByName []*Package
 
 func (a ByName) Len() int           { return len(a) }