iceberg: wire pagination for list namespaces/tables REST APIs (#8275)

* s3api/iceberg: wire list pagination tokens and page size

* fmt

* Update weed/s3api/iceberg/iceberg.go

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

---------

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

weed/s3api/iceberg/iceberg.go

@@ -10,6 +10,7 @@ import (
 	"net/http"
 	"os"
 	"path"
+	"strconv"
 	"strings"
 	"time"
 
@@ -368,6 +369,38 @@ func buildTableBucketARN(bucketName string) string {
 	return arn
 }
 
+const (
+	defaultListPageSize = 1000
+	maxListPageSize     = 1000
+)
+
+func getPaginationQueryParam(r *http.Request, primary, fallback string) string {
+	if v := strings.TrimSpace(r.URL.Query().Get(primary)); v != "" {
+		return v
+	}
+	return strings.TrimSpace(r.URL.Query().Get(fallback))
+}
+
+func parsePagination(r *http.Request) (pageToken string, pageSize int, err error) {
+	pageToken = getPaginationQueryParam(r, "pageToken", "page-token")
+	pageSize = defaultListPageSize
+
+	pageSizeValue := getPaginationQueryParam(r, "pageSize", "page-size")
+	if pageSizeValue == "" {
+		return pageToken, pageSize, nil
+	}
+
+	parsedPageSize, parseErr := strconv.Atoi(pageSizeValue)
+	if parseErr != nil || parsedPageSize <= 0 {
+		return pageToken, 0, fmt.Errorf("invalid pageSize %q: must be a positive integer", pageSizeValue)
+	}
+	if parsedPageSize > maxListPageSize {
+		return pageToken, 0, fmt.Errorf("invalid pageSize %q: must be <= %d", pageSizeValue, maxListPageSize)
+	}
+
+	return pageToken, parsedPageSize, nil
+}
+
 // handleConfig returns catalog configuration.
 func (s *Server) handleConfig(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-Type", "application/json")
@@ -388,14 +421,21 @@ func (s *Server) handleListNamespaces(w http.ResponseWriter, r *http.Request) {
 	// Extract identity from context
 	identityName := s3_constants.GetIdentityNameFromContext(r)
 
+	pageToken, pageSize, err := parsePagination(r)
+	if err != nil {
+		writeError(w, http.StatusBadRequest, "BadRequestException", err.Error())
+		return
+	}
+
 	// Use S3 Tables manager to list namespaces
 	var resp s3tables.ListNamespacesResponse
 	req := &s3tables.ListNamespacesRequest{
 		TableBucketARN:    bucketARN,
-		MaxNamespaces:  1000,
+		ContinuationToken: pageToken,
+		MaxNamespaces:     pageSize,
 	}
 
-	err := s.filerClient.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
+	err = s.filerClient.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
 		mgrClient := s3tables.NewManagerClient(client)
 		return s.tablesManager.Execute(r.Context(), mgrClient, "ListNamespaces", req, &resp, identityName)
 	})
@@ -413,6 +453,7 @@ func (s *Server) handleListNamespaces(w http.ResponseWriter, r *http.Request) {
 	}
 
 	result := ListNamespacesResponse{
+		NextPageToken: resp.ContinuationToken,
 		Namespaces:    namespaces,
 	}
 	writeJSON(w, http.StatusOK, result)
@@ -615,14 +656,21 @@ func (s *Server) handleListTables(w http.ResponseWriter, r *http.Request) {
 	// Extract identity from context
 	identityName := s3_constants.GetIdentityNameFromContext(r)
 
+	pageToken, pageSize, err := parsePagination(r)
+	if err != nil {
+		writeError(w, http.StatusBadRequest, "BadRequestException", err.Error())
+		return
+	}
+
 	listReq := &s3tables.ListTablesRequest{
 		TableBucketARN:    bucketARN,
 		Namespace:         namespace,
-		MaxTables:      1000,
+		ContinuationToken: pageToken,
+		MaxTables:         pageSize,
 	}
 	var listResp s3tables.ListTablesResponse
 
-	err := s.filerClient.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
+	err = s.filerClient.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
 		mgrClient := s3tables.NewManagerClient(client)
 		return s.tablesManager.Execute(r.Context(), mgrClient, "ListTables", listReq, &listResp, identityName)
 	})
@@ -647,6 +695,7 @@ func (s *Server) handleListTables(w http.ResponseWriter, r *http.Request) {
 	}
 
 	result := ListTablesResponse{
+		NextPageToken: listResp.ContinuationToken,
 		Identifiers:   identifiers,
 	}
 	writeJSON(w, http.StatusOK, result)

weed/s3api/iceberg/iceberg_pagination_test.go

@@ -0,0 +1,69 @@
+package iceberg
+
+import (
+	"net/http/httptest"
+	"testing"
+)
+
+func TestParsePaginationDefaultValues(t *testing.T) {
+	req := httptest.NewRequest("GET", "/v1/namespaces", nil)
+
+	pageToken, pageSize, err := parsePagination(req)
+	if err != nil {
+		t.Fatalf("parsePagination() error = %v", err)
+	}
+	if pageToken != "" {
+		t.Fatalf("pageToken = %q, want empty", pageToken)
+	}
+	if pageSize != defaultListPageSize {
+		t.Fatalf("pageSize = %d, want %d", pageSize, defaultListPageSize)
+	}
+}
+
+func TestParsePaginationUsesCamelCaseParameters(t *testing.T) {
+	req := httptest.NewRequest("GET", "/v1/namespaces?pageToken=abc&pageSize=25", nil)
+
+	pageToken, pageSize, err := parsePagination(req)
+	if err != nil {
+		t.Fatalf("parsePagination() error = %v", err)
+	}
+	if pageToken != "abc" {
+		t.Fatalf("pageToken = %q, want %q", pageToken, "abc")
+	}
+	if pageSize != 25 {
+		t.Fatalf("pageSize = %d, want %d", pageSize, 25)
+	}
+}
+
+func TestParsePaginationSupportsHyphenatedFallback(t *testing.T) {
+	req := httptest.NewRequest("GET", "/v1/namespaces?page-token=abc&page-size=17", nil)
+
+	pageToken, pageSize, err := parsePagination(req)
+	if err != nil {
+		t.Fatalf("parsePagination() error = %v", err)
+	}
+	if pageToken != "abc" {
+		t.Fatalf("pageToken = %q, want %q", pageToken, "abc")
+	}
+	if pageSize != 17 {
+		t.Fatalf("pageSize = %d, want %d", pageSize, 17)
+	}
+}
+
+func TestParsePaginationRejectsInvalidPageSize(t *testing.T) {
+	testCases := []string{
+		"/v1/namespaces?pageSize=0",
+		"/v1/namespaces?pageSize=-1",
+		"/v1/namespaces?pageSize=foo",
+		"/v1/namespaces?pageSize=1001",
+	}
+
+	for _, rawURL := range testCases {
+		t.Run(rawURL, func(t *testing.T) {
+			req := httptest.NewRequest("GET", rawURL, nil)
+			if _, _, err := parsePagination(req); err == nil {
+				t.Fatalf("parsePagination() expected error for url %q", rawURL)
+			}
+		})
+	}
+}

weed/server/volume_grpc_erasure_coding_test.go

@@ -54,4 +54,3 @@ func TestCheckEcVolumeStatusCountOnlyDataShards(t *testing.T) {
 		t.Fatalf("expected shardCount=3, got %d", shardCount)
 	}
 }
-