incremental improvement in catalogmetadata cache/client performance

Signed-off-by: Joe Lanford <joe.lanford@gmail.com>

Makefile

@@ -135,7 +135,7 @@ test-ext-dev-e2e: $(OPERATOR_SDK) $(KUSTOMIZE) $(KIND) #HELP Run extension creat
 ENVTEST_VERSION := $(shell go list -m k8s.io/client-go | cut -d" " -f2 | sed 's/^v0\.\([[:digit:]]\{1,\}\)\.[[:digit:]]\{1,\}$$/1.\1.x/')
 UNIT_TEST_DIRS := $(shell go list ./... | grep -v /test/)
 test-unit: $(SETUP_ENVTEST) #HELP Run the unit tests
-	eval $$($(SETUP_ENVTEST) use -p env $(ENVTEST_VERSION) $(SETUP_ENVTEST_BIN_DIR_OVERRIDE)) && go test -count=1 -short $(UNIT_TEST_DIRS) -coverprofile cover.out
+	eval $$($(SETUP_ENVTEST) use -p env $(ENVTEST_VERSION) $(SETUP_ENVTEST_BIN_DIR_OVERRIDE)) && go test -count=1 -race -short $(UNIT_TEST_DIRS) -coverprofile cover.out
 
 image-registry: ## Setup in-cluster image registry
 	./test/tools/image-registry.sh $(E2E_REGISTRY_NAMESPACE) $(E2E_REGISTRY_NAME)

internal/catalogmetadata/cache/cache.go

@@ -3,13 +3,14 @@ package cache
 import (
 	"context"
 	"fmt"
-	"io"
+	"io/fs"
 	"net/http"
 	"os"
 	"path/filepath"
 	"sync"
 
 	catalogd "github.com/operator-framework/catalogd/api/core/v1alpha1"
+	"github.com/operator-framework/operator-registry/alpha/declcfg"
 
 	"github.com/operator-framework/operator-controller/internal/catalogmetadata/client"
 )
@@ -66,7 +67,7 @@ type filesystemCache struct {
 // resources that have been successfully reconciled, unpacked, and are being served.
 // These requirements help ensure that we can rely on status conditions to determine
 // when to issue a request to update the cached Catalog contents.
-func (fsc *filesystemCache) FetchCatalogContents(ctx context.Context, catalog *catalogd.ClusterCatalog) (io.ReadCloser, error) {
+func (fsc *filesystemCache) FetchCatalogContents(ctx context.Context, catalog *catalogd.ClusterCatalog) (fs.FS, error) {
 	if catalog == nil {
 		return nil, fmt.Errorf("error: provided catalog must be non-nil")
 	}
@@ -80,25 +81,23 @@ func (fsc *filesystemCache) FetchCatalogContents(ctx context.Context, catalog *c
 	}
 
 	cacheDir := filepath.Join(fsc.cachePath, catalog.Name)
-	cacheFilePath := filepath.Join(cacheDir, "data.json")
-
 	fsc.mutex.RLock()
 	if data, ok := fsc.cacheDataByCatalogName[catalog.Name]; ok {
 		if catalog.Status.ResolvedSource.Image.ResolvedRef == data.ResolvedRef {
 			fsc.mutex.RUnlock()
-			return os.Open(cacheFilePath)
+			return os.DirFS(cacheDir), nil
 		}
 	}
 	fsc.mutex.RUnlock()
 
 	req, err := http.NewRequestWithContext(ctx, http.MethodGet, catalog.Status.ContentURL, nil)
 	if err != nil {
-		return nil, fmt.Errorf("error forming request: %s", err)
+		return nil, fmt.Errorf("error forming request: %v", err)
 	}
 
 	resp, err := fsc.client.Do(req)
 	if err != nil {
-		return nil, fmt.Errorf("error performing request: %s", err)
+		return nil, fmt.Errorf("error performing request: %v", err)
 	}
 	defer resp.Body.Close()
 
@@ -117,34 +116,49 @@ func (fsc *filesystemCache) FetchCatalogContents(ctx context.Context, catalog *c
 	// the cached contents
 	if data, ok := fsc.cacheDataByCatalogName[catalog.Name]; ok {
 		if data.ResolvedRef == catalog.Status.ResolvedSource.Image.Ref {
-			return os.Open(cacheFilePath)
+			return os.DirFS(cacheDir), nil
 		}
 	}
 
-	if err = os.MkdirAll(cacheDir, os.ModePerm); err != nil {
-		return nil, fmt.Errorf("error creating cache directory for Catalog %q: %s", catalog.Name, err)
-	}
-
-	file, err := os.Create(cacheFilePath)
+	tmpDir, err := os.MkdirTemp(fsc.cachePath, fmt.Sprintf(".%s-", catalog.Name))
 	if err != nil {
-		return nil, fmt.Errorf("error creating cache file for Catalog %q: %s", catalog.Name, err)
+		return nil, fmt.Errorf("error creating temporary directory to unpack catalog metadata: %s", err)
 	}
 
-	if _, err := io.Copy(file, resp.Body); err != nil {
-		return nil, fmt.Errorf("error writing contents to cache file for Catalog %q: %s", catalog.Name, err)
+	if err := declcfg.WalkMetasReader(resp.Body, func(meta *declcfg.Meta, err error) error {
+		if err != nil {
+			return fmt.Errorf("error parsing catalog contents: %v", err)
+		}
+		pkgName := meta.Package
+		if meta.Schema == declcfg.SchemaPackage {
+			pkgName = meta.Name
+		}
+		metaName := meta.Name
+		if meta.Name == "" {
+			metaName = meta.Schema
+		}
+		metaPath := filepath.Join(tmpDir, pkgName, meta.Schema, metaName+".json")
+		if err := os.MkdirAll(filepath.Dir(metaPath), os.ModePerm); err != nil {
+			return fmt.Errorf("error creating directory for catalog metadata: %v", err)
+		}
+		if err := os.WriteFile(metaPath, meta.Blob, os.ModePerm); err != nil {
+			return fmt.Errorf("error writing catalog metadata to file: %v", err)
+		}
+		return nil
+	}); err != nil {
+		return nil, err
 	}
 
-	if err = file.Sync(); err != nil {
-		return nil, fmt.Errorf("error syncing contents to cache file for Catalog %q: %s", catalog.Name, err)
+	if err := os.RemoveAll(cacheDir); err != nil {
+		return nil, fmt.Errorf("error removing old cache directory: %v", err)
 	}
-
-	if _, err = file.Seek(0, 0); err != nil {
-		return nil, fmt.Errorf("error resetting offset for cache file reader for Catalog %q: %s", catalog.Name, err)
+	if err := os.Rename(tmpDir, cacheDir); err != nil {
+		return nil, fmt.Errorf("error moving temporary directory to cache directory: %v", err)
 	}
 
 	fsc.cacheDataByCatalogName[catalog.Name] = cacheData{
 		ResolvedRef: catalog.Status.ResolvedSource.Image.ResolvedRef,
 	}
 
-	return file, nil
+	return os.DirFS(cacheDir), nil
 }