Updated logic to handle a single core

The remote loader was blocking the only thread.

Signed-off-by: quobix <dave@quobix.com>

document_examples_test.go

@@ -119,9 +119,10 @@ func ExampleNewDocument_fromWithDocumentConfigurationSuccess() {
 	// create a DocumentConfiguration that allows loading file and remote references, and sets the baseURL
 	// to somewhere that can resolve the relative references.
 	config := datamodel.DocumentConfiguration{
-		AllowFileReferences:   true,
-		AllowRemoteReferences: true,
 		BaseURL: baseURL,
+		Logger: slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
+			Level: slog.LevelError,
+		})),
 	}
 
 	// create a new document from specification bytes

index/rolodex_remote_loader.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"github.com/pb33f/libopenapi/datamodel"
 	"log/slog"
+	"runtime"
 
 	"golang.org/x/sync/syncmap"
 	"gopkg.in/yaml.v3"
@@ -259,6 +260,9 @@ func (i *RemoteFS) Open(remoteURL string) (fs.File, error) {
 	// if we're processing, we need to block and wait for the file to be processed
 	// try path first
 	if _, ok := i.ProcessingFiles.Load(remoteParsedURL.Path); ok {
+		// we can't block if we only have a single CPU, as we'll deadlock, only when we're running in parallel
+		// can we block threads.
+		if runtime.GOMAXPROCS(-1) > 1 {
 			i.logger.Debug("waiting for existing fetch to complete", "file", remoteURL, "remoteURL", remoteParsedURL.String())
 			for {
 				if wf, ko := i.Files.Load(remoteParsedURL.Path); ko {
@@ -266,6 +270,7 @@ func (i *RemoteFS) Open(remoteURL string) (fs.File, error) {
 				}
 			}
 		}
+	}
 
 	// add to processing
 	i.ProcessingFiles.Store(remoteParsedURL.Path, true)
@@ -288,10 +293,10 @@ func (i *RemoteFS) Open(remoteURL string) (fs.File, error) {
 
 	i.logger.Debug("loading remote file", "file", remoteURL, "remoteURL", remoteParsedURL.String())
 
-	// no handler func? use the default client.
-	if i.RemoteHandlerFunc == nil {
-		i.RemoteHandlerFunc = i.defaultClient.Get
-	}
+	//// no handler func? use the default client.
+	//if i.RemoteHandlerFunc == nil {
+	//	i.RemoteHandlerFunc = i.defaultClient.Get
+	//}
 
 	response, clientErr := i.RemoteHandlerFunc(remoteParsedURL.String())
 	if clientErr != nil {

index/spec_index_test.go

@@ -103,7 +103,7 @@ func TestSpecIndex_DigitalOcean(t *testing.T) {
 	cf.AllowRemoteLookup = true
 	cf.AvoidCircularReferenceCheck = true
 	cf.Logger = slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
-		Level: slog.LevelError,
+		Level: slog.LevelDebug,
 	}))
 
 	// setting this baseURL will override the base