chore: remove returned versions from collator.Collate

Nothing was using the returned value so there is no point returning it.
Makes the surface area a bit smaller so it is easier to reason about.

vervet-underground/internal/storage/collator.go

@@ -98,7 +98,7 @@ func (c *Collator) Add(service string, revision ContentRevision) {
 }
 
 // Collate processes added service revisions to collate unified versions and OpenAPI specs for each version.
-func (c *Collator) Collate() (vervet.VersionSlice, map[vervet.Version]openapi3.T, error) {
+func (c *Collator) Collate() (map[vervet.Version]openapi3.T, error) {
 	specs := make(map[vervet.Version]openapi3.T)
 	sort.Sort(c.uniqueVersions)
 
@@ -120,23 +120,23 @@ func (c *Collator) Collate() (vervet.VersionSlice, map[vervet.Version]openapi3.T
 			if err != nil {
 				log.Error().Err(err).Msgf("could not merge revision for version %s", version)
 				collatorMergeError.WithLabelValues(version.String()).Inc()
-				return nil, nil, err
+				return nil, err
 			}
 			if err := vervet.RemoveElements(spec, c.excludePatterns); err != nil {
 				log.Error().Err(err).Msgf("could not merge revision for version %s", version)
 				collatorMergeError.WithLabelValues(version.String()).Inc()
-				return nil, nil, err
+				return nil, err
 			}
 			if err := c.applyOverlay(spec); err != nil {
 				log.Error().Err(err).Msgf("failed to merge overlay for version %s", version)
 				collatorMergeError.WithLabelValues(version.String()).Inc()
-				return nil, nil, err
+				return nil, err
 			}
 			specs[version] = *spec
 		}
 	}
 
-	return c.uniqueVersions, specs, nil
+	return specs, nil
 }
 
 func mergeRevisions(revisions ContentRevisions) (*openapi3.T, error) {

vervet-underground/internal/storage/collator_test.go

@@ -137,12 +137,8 @@ func TestCollator_Collate(t *testing.T) {
 		Blob:    []byte(serviceBSpec),
 	})
 
-	versions, specs, err := collator.Collate()
+	specs, err := collator.Collate()
 	c.Assert(err, qt.IsNil)
-	c.Assert(len(versions), qt.Equals, 3)
-	c.Assert(versions[0], qt.Equals, v20220201_beta)
-	c.Assert(versions[1], qt.Equals, v20220301_ga)
-	c.Assert(versions[2], qt.Equals, v20220401_ga)
 
 	c.Assert(specs[v20220201_beta].Paths.Find("/test"), qt.IsNotNil)
 	c.Assert(specs[v20220201_beta].Paths.Find("/example"), qt.IsNil)
@@ -181,11 +177,8 @@ func TestCollator_Collate_MigratingEndpoints(t *testing.T) {
 		Blob:    []byte(serviceCSpec),
 	})
 
-	versions, specs, err := collator.Collate()
+	specs, err := collator.Collate()
 	c.Assert(err, qt.IsNil)
-	c.Assert(len(versions), qt.Equals, 2)
-	c.Assert(versions[0], qt.Equals, v20220201_exp)
-	c.Assert(versions[1], qt.Equals, v20230314_exp)
 
 	c.Assert(specs[v20220201_exp].Paths.Find("/test"), qt.IsNotNil)
 	c.Assert(specs[v20230314_exp].Paths.Find("/test"), qt.IsNotNil)
@@ -222,7 +215,7 @@ func TestCollator_Collate_ExcludePatterns(t *testing.T) {
 		Version: v20220401_ga,
 		Blob:    []byte(serviceBSpec),
 	})
-	_, specs, err := collator.Collate()
+	specs, err := collator.Collate()
 	c.Assert(err, qt.IsNil)
 
 	c.Assert(specs[v20220401_ga].Paths["/example"].Post.Extensions["x-other-internal"], qt.IsNil)
@@ -256,7 +249,7 @@ func TestCollator_Collate_Conflict(t *testing.T) {
 		Timestamp: time.Date(2021, 6, 15, 0, 0, 0, 0, time.UTC),
 	})
 
-	_, specs, err := collator.Collate()
+	specs, err := collator.Collate()
 	c.Assert(err, qt.IsNil)
 	// First path wins
 	c.Assert(specs[vervet.MustParseVersion("2021-06-15")].Paths["/examples/hello-world"].Post.Description,
@@ -304,7 +297,7 @@ func TestCollator_Collate_Overlay(t *testing.T) {
 		Version: v20220401_ga,
 		Blob:    []byte(serviceBSpec),
 	})
-	_, specs, err := collator.Collate()
+	specs, err := collator.Collate()
 	c.Assert(err, qt.IsNil)
 
 	c.Assert(specs[v20220401_ga].Servers[0].URL, qt.Equals, "https://awesome.snyk.io/rest")

vervet-underground/internal/storage/disk/disk.go

@@ -115,7 +115,7 @@ func (s *Storage) CollateVersions(ctx context.Context, serviceFilter map[string]
 		}
 		aggregate.Add(service, revision)
 	}
-	_, specs, err := aggregate.Collate()
+	specs, err := aggregate.Collate()
 	if err != nil {
 		return err
 	}

vervet-underground/internal/storage/gcs/client.go

@@ -156,7 +156,7 @@ func (s *Storage) CollateVersions(ctx context.Context, serviceFilter map[string]
 		}
 		aggregate.Add(service, revision)
 	}
-	_, specs, err := aggregate.Collate()
+	specs, err := aggregate.Collate()
 	if err != nil {
 		return err
 	}

vervet-underground/internal/storage/s3/client.go

@@ -269,7 +269,7 @@ func (s *Storage) CollateVersions(ctx context.Context, serviceFilter map[string]
 		}
 		aggregate.Add(service, revision)
 	}
-	_, specs, err := aggregate.Collate()
+	specs, err := aggregate.Collate()
 	if err != nil {
 		return err
 	}