VTAdmin: Distributed transactions list on VTAdmin (#16793)

Signed-off-by: Noble Mittal <noblemittal@outlook.com>

go/vt/vtadmin/api.go

@@ -414,6 +414,7 @@ func (api *API) Handler() http.Handler {
 	router.HandleFunc("/tablet/{tablet}/start_replication", httpAPI.Adapt(vtadminhttp.StartReplication)).Name("API.StartReplication").Methods("PUT", "OPTIONS")
 	router.HandleFunc("/tablet/{tablet}/stop_replication", httpAPI.Adapt(vtadminhttp.StopReplication)).Name("API.StopReplication").Methods("PUT", "OPTIONS")
 	router.HandleFunc("/tablet/{tablet}/externally_promoted", httpAPI.Adapt(vtadminhttp.TabletExternallyPromoted)).Name("API.TabletExternallyPromoted").Methods("POST")
+	router.HandleFunc("/transactions/{cluster_id}/{keyspace}", httpAPI.Adapt(vtadminhttp.GetUnresolvedTransactions)).Name("API.GetUnresolvedTransactions").Methods("GET")
 	router.HandleFunc("/vschema/{cluster_id}/{keyspace}", httpAPI.Adapt(vtadminhttp.GetVSchema)).Name("API.GetVSchema")
 	router.HandleFunc("/vschemas", httpAPI.Adapt(vtadminhttp.GetVSchemas)).Name("API.GetVSchemas")
 	router.HandleFunc("/vtctlds", httpAPI.Adapt(vtadminhttp.GetVtctlds)).Name("API.GetVtctlds")
@@ -1482,6 +1483,27 @@ func (api *API) GetTopologyPath(ctx context.Context, req *vtadminpb.GetTopologyP
 	return c.Vtctld.GetTopologyPath(ctx, &vtctldatapb.GetTopologyPathRequest{Path: req.Path})
 }
 
+// GetUnresolvedTransactions is part of the vtadminpb.VTAdminServer interface.
+func (api *API) GetUnresolvedTransactions(ctx context.Context, req *vtadminpb.GetUnresolvedTransactionsRequest) (*vtctldatapb.GetUnresolvedTransactionsResponse, error) {
+	span, ctx := trace.NewSpan(ctx, "API.GetUnresolvedTransactions")
+	defer span.Finish()
+
+	c, err := api.getClusterForRequest(req.ClusterId)
+	if err != nil {
+		return nil, err
+	}
+
+	cluster.AnnotateSpan(c, span)
+
+	if !api.authz.IsAuthorized(ctx, c.ID, rbac.KeyspaceResource, rbac.GetAction) {
+		return nil, nil
+	}
+
+	return c.Vtctld.GetUnresolvedTransactions(ctx, &vtctldatapb.GetUnresolvedTransactionsRequest{
+		Keyspace: req.Keyspace,
+	})
+}
+
 // GetVSchema is part of the vtadminpb.VTAdminServer interface.
 func (api *API) GetVSchema(ctx context.Context, req *vtadminpb.GetVSchemaRequest) (*vtadminpb.VSchema, error) {
 	span, ctx := trace.NewSpan(ctx, "API.GetVSchema")

go/vt/vtadmin/http/transactions.go

@@ -0,0 +1,36 @@
+/*
+Copyright 2024 The Vitess Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package http
+
+import (
+	"context"
+
+	vtadminpb "vitess.io/vitess/go/vt/proto/vtadmin"
+)
+
+// GetUnresolvedTransactions implements the http wrapper for the
+// /transactions/{cluster_id}/{keyspace} route.
+func GetUnresolvedTransactions(ctx context.Context, r Request, api *API) *JSONResponse {
+	vars := r.Vars()
+
+	res, err := api.server.GetUnresolvedTransactions(ctx, &vtadminpb.GetUnresolvedTransactionsRequest{
+		ClusterId: vars["cluster_id"],
+		Keyspace:  vars["keyspace"],
+	})
+
+	return NewJSONResponse(res, err)
+}