Reduce 503 retries for tests

src/pkg/services/m365/api/events_pager_test.go

@@ -18,6 +18,7 @@ import (
 	"github.com/alcionai/corso/src/internal/tester"
 	"github.com/alcionai/corso/src/internal/tester/tconfig"
 	"github.com/alcionai/corso/src/pkg/count"
+	"github.com/alcionai/corso/src/pkg/services/m365/api/graph"
 )
 
 // ---------------------------------------------------------------------------
@@ -107,13 +108,10 @@ func (suite *EventsPagerUnitSuite) TestEventsList() {
 			Reply(http.StatusOK).
 			JSON(validEventsListSingleNextLinkResponse)
 
-		// Number of retries and delay between retries is handled by a kiota
-		// middleware. We can change the default config parameters when setting
-		// up the mock in a later PR.
 		gock.New(graphAPIHostURL).
 			Get(nextLinkPath).
 			AddMatcher(pageSizeMatcher(t, expectedPageSize)).
-			Times(4).
+			Times(2). // retry count is configured to 1
 			Reply(http.StatusServiceUnavailable).
 			BodyString("").
 			Type("text/plain")
@@ -241,7 +239,9 @@ func (suite *EventsPagerUnitSuite) TestEventsList() {
 			creds, err := a.M365Config()
 			require.NoError(t, err, clues.ToCore(err))
 
-			client, err := gockClient(creds, count.New())
+			// Run with a single retry since 503 retries are exponential and
+			// the test will take a long time to run.
+			client, err := gockClient(creds, count.New(), graph.MaxRetries(1))
 			require.NoError(t, err, clues.ToCore(err))
 
 			t.Cleanup(gock.Off)

src/pkg/services/m365/api/graph/service.go

@@ -2,6 +2,7 @@ package graph
 
 import (
 	"context"
+	"io"
 	"net/http"
 	"time"
 
@@ -173,7 +174,15 @@ func KiotaHTTPClient(
 const (
 	defaultDelay             = 3 * time.Second
 	defaultHTTPClientTimeout = 1 * time.Hour
+
+	// Default retry count for retry middlewares
 	defaultMaxRetries = 3
+	// Retry count for graph adapter
+	//
+	// Bumping retries to 6 since we have noticed that auth token expiry errors
+	// may continue to persist even after 3 retries.
+	adapterMaxRetries = 6
+
 	// FIXME: This should ideally be 0, but if we set to 0, graph
 	// client with automatically set the context timeout to 0 as
 	// well which will make the client unusable.
@@ -200,7 +209,7 @@ type Option func(*clientConfig)
 // populate constructs a clientConfig according to the provided options.
 func populateConfig(opts ...Option) *clientConfig {
 	cc := clientConfig{
-		maxConnectionRetries: defaultMaxRetries,
+		maxConnectionRetries: adapterMaxRetries,
 		maxRetries:           defaultMaxRetries,
 		minDelay:             defaultDelay,
 		timeout:              defaultHTTPClientTimeout,
@@ -373,9 +382,11 @@ func wrapAdapter(gra *msgraphsdkgo.GraphRequestAdapter, cc *clientConfig) *adapt
 	}
 }
 
-var connectionEnded = filters.Contains([]string{
+// Graph may abruptly close connections, which we should retry.
+var connectionEnded = filters.In([]string{
 	"connection reset by peer",
 	"client connection force closed",
+	"read: connection timed out",
 })
 
 func (aw *adapterWrap) Send(
@@ -416,7 +427,9 @@ func (aw *adapterWrap) Send(
 		err = stackWithCoreErr(ictx, err, 1)
 		e = err
 
-		if IsErrConnectionReset(err) || connectionEnded.Compare(err.Error()) {
+		if IsErrConnectionReset(err) ||
+			connectionEnded.Compare(err.Error()) ||
+			errors.Is(err, io.ErrUnexpectedEOF) {
 			logger.Ctx(ictx).Debug("http connection error")
 			events.Inc(events.APICall, "connectionerror")
 		} else if errors.Is(err, core.ErrAuthTokenExpired) {

src/pkg/services/m365/api/graph/service_test.go

@@ -93,7 +93,7 @@ func (suite *GraphIntgSuite) TestHTTPClient() {
 			checkConfig: func(t *testing.T, c *clientConfig) {
 				assert.Equal(t, defaultDelay, c.minDelay, "default delay")
 				assert.Equal(t, defaultMaxRetries, c.maxRetries, "max retries")
-				assert.Equal(t, defaultMaxRetries, c.maxConnectionRetries, "max connection retries")
+				assert.Equal(t, adapterMaxRetries, c.maxConnectionRetries, "max connection retries")
 			},
 		},
 		{
@@ -221,17 +221,64 @@ func (suite *GraphIntgSuite) TestAdapterWrap_catchesPanic() {
 	require.Contains(t, err.Error(), "panic", clues.ToCore(err))
 }
 
-func (suite *GraphIntgSuite) TestAdapterWrap_retriesConnectionClose() {
+func (suite *GraphIntgSuite) TestAdapterWrap_retriesConnectionInterruptions() {
+	table := []struct {
+		name             string
+		providedErr      error
+		expectRetryCount int
+		expectErr        assert.ErrorAssertionFunc
+	}{
+		{
+			name:             "ECONNRESET",
+			providedErr:      syscall.ECONNRESET,
+			expectRetryCount: 7,
+			expectErr:        assert.Error,
+		},
+		{
+			name:             "connection reset by peer",
+			providedErr:      clues.New("connection reset by peer what is love"),
+			expectRetryCount: 7,
+			expectErr:        assert.Error,
+		},
+		{
+			name:             "read: connection timed out",
+			providedErr:      clues.New("read: connection timed out baby don't hurt me"),
+			expectRetryCount: 7,
+			expectErr:        assert.Error,
+		},
+		{
+			name:             "unexpected EOF",
+			providedErr:      io.ErrUnexpectedEOF,
+			expectRetryCount: 7,
+			expectErr:        assert.Error,
+		},
+		{
+			name:             "nil error",
+			providedErr:      nil,
+			expectRetryCount: 1,
+			expectErr:        assert.NoError,
+		},
+		{
+			name:             "non retriable error",
+			providedErr:      clues.New("no more"),
+			expectRetryCount: 1,
+			expectErr:        assert.Error,
+		},
+	}
+
+	for _, test := range table {
+		suite.Run(test.name, func() {
 			t := suite.T()
 
 			ctx, flush := tester.NewContext(t)
 			defer flush()
 
 			retryInc := 0
-
-	// the panics should get caught and returned as errors
-	alwaysECONNRESET := mwForceResp{
-		err: syscall.ECONNRESET,
+			forceErrMW := mwForceResp{
+				err: test.providedErr,
+				// send some dummy response, because kiota retry handler panics
+				// if err is nil and resp is nil.
+				resp: &http.Response{},
 				alternate: func(req *http.Request) (bool, *http.Response, error) {
 					retryInc++
 					return false, nil, nil
@@ -243,7 +290,7 @@ func (suite *GraphIntgSuite) TestAdapterWrap_retriesConnectionClose() {
 				suite.credentials.AzureClientID,
 				suite.credentials.AzureClientSecret,
 				count.New(),
-		appendMiddleware(&alwaysECONNRESET),
+				appendMiddleware(&forceErrMW),
 				// Configure retry middlewares so that they don't retry on connection reset.
 				// Those middlewares have their own tests to verify retries.
 				MaxRetries(-1))
@@ -256,8 +303,10 @@ func (suite *GraphIntgSuite) TestAdapterWrap_retriesConnectionClose() {
 
 			// the query doesn't matter
 			_, err = NewService(adpt).Client().Users().Get(ctx, nil)
-	require.ErrorIs(t, err, syscall.ECONNRESET, clues.ToCore(err))
-	require.Equal(t, 4, retryInc, "number of retries")
+			test.expectErr(t, err, clues.ToCore(err))
+			require.Equal(t, test.expectRetryCount, retryInc, "number of retries")
+		})
+	}
 }
 
 func (suite *GraphIntgSuite) TestAdapterWrap_retriesBadJWTToken() {
@@ -315,14 +364,14 @@ func (suite *GraphIntgSuite) TestAdapterWrap_retriesBadJWTToken() {
 		NewItemCalendarsItemEventsDeltaRequestBuilder("https://graph.microsoft.com/fnords/beaux/regard", adpt).
 		Get(ctx, nil)
 	assert.ErrorIs(t, err, core.ErrAuthTokenExpired, clues.ToCore(err))
-	assert.Equal(t, 4, retryInc, "number of retries")
+	assert.Equal(t, adapterMaxRetries+1, retryInc, "number of retries")
 
 	retryInc = 0
 
 	// the query doesn't matter
 	_, err = NewService(adpt).Client().Users().Get(ctx, nil)
 	assert.ErrorIs(t, err, core.ErrAuthTokenExpired, clues.ToCore(err))
-	assert.Equal(t, 4, retryInc, "number of retries")
+	assert.Equal(t, adapterMaxRetries+1, retryInc, "number of retries")
 }
 
 // TestAdapterWrap_retriesInvalidRequest tests adapter retries for graph 400
@@ -398,7 +447,7 @@ func (suite *GraphIntgSuite) TestAdapterWrap_retriesInvalidRequest() {
 				_, err = NewService(adpt).Client().Users().Get(ctx, nil)
 				return err
 			},
-			expectedRetries: 4,
+			expectedRetries: adapterMaxRetries + 1,
 		},
 		{
 			name: "POST request, no retry",

src/pkg/services/m365/api/helper_test.go

@@ -23,13 +23,19 @@ import (
 
 // GockClient produces a new exchange api client that can be
 // mocked using gock.
-func gockClient(creds account.M365Config, counter *count.Bus) (Client, error) {
-	s, err := graph.NewGockService(creds, counter)
+func gockClient(
+	creds account.M365Config,
+	counter *count.Bus,
+	opts ...graph.Option,
+) (Client, error) {
+	s, err := graph.NewGockService(creds, counter, opts...)
 	if err != nil {
 		return Client{}, err
 	}
 
-	li, err := graph.NewGockService(creds, counter, graph.NoTimeout())
+	opts = append(opts, graph.NoTimeout())
+
+	li, err := graph.NewGockService(creds, counter, opts...)
 	if err != nil {
 		return Client{}, err
 	}