chore: import upstream snapshot with attribution

internal/tools/postgres/postgresdatabaseoverview/postgresdatabaseoverview.go

@@ -0,0 +1,121 @@
+// 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 postgresdatabaseoverview
+
+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-database-overview"
+
+const databaseOverviewStatement = `
+    SELECT
+    current_setting('server_version') AS pg_version,
+    pg_is_in_recovery() AS is_replica,
+    (now() - pg_postmaster_start_time())::TEXT AS uptime,
+    current_setting('max_connections')::int AS max_connections,
+    (SELECT count(*) FROM pg_stat_activity) AS current_connections,
+    (SELECT count(*) FROM pg_stat_activity WHERE state = 'active') AS active_connections,
+    round(
+        (100.0 * (SELECT count(*) FROM pg_stat_activity) / current_setting('max_connections')::int),
+        2
+    ) AS pct_connections_used;
+`
+
+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 = "Fetches the current state of the PostgreSQL server, returning the version, whether it's a replica, uptime duration, maximum connection limit, number of current connections, number of active connections, and the percentage of connections in use."
+	}
+
+	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, databaseOverviewStatement, sliceParams)
+	if err != nil {
+		return nil, util.ProcessGeneralError(err)
+	}
+	return resp, nil
+}
+
+func (t Tool) ToConfig() tools.ToolConfig {
+	return t.Cfg
+}

internal/tools/postgres/postgresdatabaseoverview/postgresdatabaseoverview_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 postgresdatabaseoverview_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/postgresdatabaseoverview"
+)
+
+func TestParseFromYamlPostgresDatabaseOverview(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-database-overview
+            source: my-postgres-instance
+            description: some description
+            authRequired:
+                - my-google-auth-service
+                - other-auth-service
+			`,
+			want: server.ToolConfigs{
+				"example_tool": postgresdatabaseoverview.Config{
+					ConfigBase: tools.ConfigBase{
+						Name:         "example_tool",
+						Description:  "some description",
+						AuthRequired: []string{"my-google-auth-service", "other-auth-service"},
+					},
+					Type:   "postgres-database-overview",
+					Source: "my-postgres-instance",
+				},
+			},
+		},
+		{
+			desc: "basic example",
+			in: `
+            kind: tool
+            name: example_tool
+            type: postgres-database-overview
+            source: my-postgres-instance
+            description: some description
+			`,
+			want: server.ToolConfigs{
+				"example_tool": postgresdatabaseoverview.Config{
+					ConfigBase: tools.ConfigBase{
+						Name:         "example_tool",
+						Description:  "some description",
+						AuthRequired: []string{},
+					},
+					Type:   "postgres-database-overview",
+					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)
+			}
+		})
+	}
+
+}