chore: import upstream snapshot with attribution

internal/tools/postgres/postgreslistlocks/postgreslistlocks.go

@@ -0,0 +1,130 @@
+// Copyright 2025 Google LLC
+//
+// 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 postgreslistlocks
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+
+	yaml "github.com/goccy/go-yaml"
+	"github.com/googleapis/mcp-toolbox/internal/tools"
+	"github.com/googleapis/mcp-toolbox/internal/util"
+	"github.com/googleapis/mcp-toolbox/internal/util/parameters"
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+const resourceType string = "postgres-list-locks"
+
+const listLocks = `
+    SELECT
+        locked.pid,
+        locked.usename,
+        locked.query,
+        string_agg(locked.transactionid::text,':') as trxid,
+        string_agg(locked.lockinfo,'||') as locks
+    FROM
+        (SELECT
+          a.pid,
+          a.usename,
+          a.query,
+          l.transactionid,
+          (l.granted::text||','||coalesce(l.relation::regclass,0)::text||','||l.mode::text)::text as lockinfo
+        FROM
+          pg_stat_activity a
+          JOIN pg_locks l ON l.pid = a.pid  AND a.pid != pg_backend_pid()) as locked
+    GROUP BY
+        locked.pid, locked.usename, locked.query;
+`
+
+func init() {
+	if !tools.Register(resourceType, newConfig) {
+		panic(fmt.Sprintf("tool type %q already registered", resourceType))
+	}
+}
+
+func newConfig(ctx context.Context, name string, decoder *yaml.Decoder) (tools.ToolConfig, error) {
+	actual := Config{ConfigBase: tools.ConfigBase{Name: name}}
+	if err := decoder.DecodeContext(ctx, &actual); err != nil {
+		return nil, err
+	}
+	return actual, nil
+}
+
+type compatibleSource interface {
+	PostgresPool() *pgxpool.Pool
+	RunSQL(context.Context, string, []any) (any, error)
+}
+
+type Config struct {
+	tools.ConfigBase `yaml:",inline"`
+	Type             string                 `yaml:"type" validate:"required"`
+	Source           string                 `yaml:"source" validate:"required"`
+	Annotations      *tools.ToolAnnotations `yaml:"annotations,omitempty"`
+}
+
+var _ tools.ToolConfig = Config{}
+
+func (cfg Config) ToolConfigType() string {
+	return resourceType
+}
+
+func (cfg Config) Initialize(context.Context) (tools.Tool, error) {
+	allParameters := parameters.Parameters{}
+
+	if cfg.Description == "" {
+		cfg.Description = "Identifies all locks held by active processes showing the process ID, user, query text, and an aggregated list of all transactions and specific locks (relation, mode, grant status) associated with each process."
+	}
+
+	return Tool{
+		BaseTool: tools.NewBaseTool(
+			cfg,
+			tools.GetAnnotationsOrDefault(cfg.Annotations, tools.NewReadOnlyAnnotations),
+			tools.Manifest{Description: cfg.Description, Parameters: allParameters.Manifest(), AuthRequired: cfg.AuthRequired},
+			allParameters,
+		),
+	}, nil
+}
+
+var _ tools.Tool = Tool{}
+
+type Tool struct {
+	tools.BaseTool[Config]
+}
+
+func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
+	source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Cfg.Source, t.Cfg.Name, t.Cfg.Type)
+	if err != nil {
+		return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
+	}
+
+	paramsMap := params.AsMap()
+
+	newParams, err := parameters.GetParams(t.StaticParameters, paramsMap)
+	if err != nil {
+		return nil, util.NewAgentError("unable to extract standard params", err)
+	}
+	sliceParams := newParams.AsSlice()
+
+	resp, err := source.RunSQL(ctx, listLocks, sliceParams)
+	if err != nil {
+		return nil, util.ProcessGeneralError(err)
+	}
+	return resp, nil
+}
+
+func (t Tool) ToConfig() tools.ToolConfig {
+	return t.Cfg
+}

internal/tools/postgres/postgreslistlocks/postgreslistlocks_test.go

@@ -0,0 +1,96 @@
+// Copyright 2025 Google LLC
+//
+// 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 postgreslistlocks_test
+
+import (
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/googleapis/mcp-toolbox/internal/server"
+	"github.com/googleapis/mcp-toolbox/internal/testutils"
+	"github.com/googleapis/mcp-toolbox/internal/tools"
+	"github.com/googleapis/mcp-toolbox/internal/tools/postgres/postgreslistlocks"
+)
+
+func TestParseFromYamlPostgresListLocks(t *testing.T) {
+	ctx, err := testutils.ContextWithNewLogger()
+	if err != nil {
+		t.Fatalf("unexpected error: %s", err)
+	}
+	tcs := []struct {
+		desc string
+		in   string
+		want server.ToolConfigs
+	}{
+		{
+			desc: "basic example",
+			in: `
+            kind: tool
+            name: example_tool
+            type: postgres-list-locks
+            source: my-postgres-instance
+            description: some description
+            authRequired:
+                - my-google-auth-service
+                - other-auth-service
+			`,
+			want: server.ToolConfigs{
+				"example_tool": postgreslistlocks.Config{
+					ConfigBase: tools.ConfigBase{
+						Name:         "example_tool",
+						Description:  "some description",
+						AuthRequired: []string{"my-google-auth-service", "other-auth-service"},
+					},
+					Type:   "postgres-list-locks",
+					Source: "my-postgres-instance",
+				},
+			},
+		},
+		{
+			desc: "basic example",
+			in: `
+            kind: tool
+            name: example_tool
+            type: postgres-list-locks
+            source: my-postgres-instance
+            description: some description
+			`,
+			want: server.ToolConfigs{
+				"example_tool": postgreslistlocks.Config{
+					ConfigBase: tools.ConfigBase{
+						Name:         "example_tool",
+						Description:  "some description",
+						AuthRequired: []string{},
+					},
+					Type:   "postgres-list-locks",
+					Source: "my-postgres-instance",
+				},
+			},
+		},
+	}
+	for _, tc := range tcs {
+		t.Run(tc.desc, func(t *testing.T) {
+			// Parse contents
+			_, _, _, got, _, _, err := server.UnmarshalResourceConfig(ctx, testutils.FormatYaml(tc.in))
+			if err != nil {
+				t.Fatalf("unable to unmarshal: %s", err)
+			}
+			if diff := cmp.Diff(tc.want, got); diff != "" {
+				t.Fatalf("incorrect parse: diff %v", diff)
+			}
+		})
+	}
+
+}