Fixed lint issues and missing documentation

internal/mock/findATender/generator.go

@@ -29,7 +29,7 @@ func NewGenerator(cat *Catalog, store *Store, seed int64) *Generator {
 	return &Generator{
 		cat:   cat,
 		store: store,
-		rnd:   rand.New(rand.NewSource(seed)),
+		rnd:   rand.New(rand.NewSource(seed)), //nolint:gosec // seeded for repeatable mock data
 	}
 }
 
@@ -46,6 +46,10 @@ func (g *Generator) Make(at time.Time) ocds.Release {
 	return g.newProcedure(at)
 }
 
+// newProcedure returns the first release of a new procedure: a tender (or,
+// one time in five, a planning notice) from a random catalog buyer and
+// subject, using a random procurement method. Values are scaled by a random
+// factor, and a tender without lots gets a single lot covering it all.
 func (g *Generator) newProcedure(at time.Time) ocds.Release {
 	buyer := g.cat.buyer(g.rnd)
 	ensurePartyID(&buyer)
@@ -189,6 +193,7 @@ func (g *Generator) advance(prev ocds.Release, at time.Time) ocds.Release {
 	return r
 }
 
+// newOCID returns a random ocid not already in the store.
 func (g *Generator) newOCID() string {
 	for {
 		id := fmt.Sprintf("%s%06x", ocidPrefix, g.rnd.Intn(1<<24))
@@ -263,6 +268,7 @@ func setStatus(t *ocds.Tender, status string) {
 	}
 }
 
+// scaleValue multiplies v's amounts by f, rounded to the nearest 100.
 func scaleValue(v *ocds.Value, f float64) {
 	if v == nil {
 		return
@@ -274,11 +280,13 @@ func scaleValue(v *ocds.Value, f float64) {
 	}
 }
 
+// ensurePartyID gives p an id derived from its name if it has none, so the
+// same organisation always gets the same id.
 func ensurePartyID(p *ocds.Organization) {
 	if p.ID != "" {
 		return
 	}
 	h := fnv.New32a()
-	h.Write([]byte(p.Name))
+	_, _ = h.Write([]byte(p.Name)) // never fails
 	p.ID = fmt.Sprintf("GB-FTS-%d", h.Sum32()%1000000)
 }