wehub-resource-sync
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122 lines
4.0 KiB
Go
122 lines
4.0 KiB
Go
// Copyright 2025 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package postgresdatabaseoverview
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import (
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"context"
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"fmt"
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"net/http"
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yaml "github.com/goccy/go-yaml"
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"github.com/googleapis/mcp-toolbox/internal/tools"
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"github.com/googleapis/mcp-toolbox/internal/util"
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"github.com/googleapis/mcp-toolbox/internal/util/parameters"
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"github.com/jackc/pgx/v5/pgxpool"
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)
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const resourceType string = "postgres-database-overview"
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const databaseOverviewStatement = `
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SELECT
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current_setting('server_version') AS pg_version,
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pg_is_in_recovery() AS is_replica,
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(now() - pg_postmaster_start_time())::TEXT AS uptime,
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current_setting('max_connections')::int AS max_connections,
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(SELECT count(*) FROM pg_stat_activity) AS current_connections,
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(SELECT count(*) FROM pg_stat_activity WHERE state = 'active') AS active_connections,
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round(
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(100.0 * (SELECT count(*) FROM pg_stat_activity) / current_setting('max_connections')::int),
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2
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) AS pct_connections_used;
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`
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func init() {
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if !tools.Register(resourceType, newConfig) {
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panic(fmt.Sprintf("tool type %q already registered", resourceType))
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}
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}
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func newConfig(ctx context.Context, name string, decoder *yaml.Decoder) (tools.ToolConfig, error) {
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actual := Config{ConfigBase: tools.ConfigBase{Name: name}}
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if err := decoder.DecodeContext(ctx, &actual); err != nil {
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return nil, err
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}
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return actual, nil
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}
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type compatibleSource interface {
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PostgresPool() *pgxpool.Pool
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RunSQL(context.Context, string, []any) (any, error)
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}
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type Config struct {
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tools.ConfigBase `yaml:",inline"`
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Type string `yaml:"type" validate:"required"`
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Source string `yaml:"source" validate:"required"`
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Annotations *tools.ToolAnnotations `yaml:"annotations,omitempty"`
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}
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var _ tools.ToolConfig = Config{}
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func (cfg Config) ToolConfigType() string {
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return resourceType
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}
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func (cfg Config) Initialize(context.Context) (tools.Tool, error) {
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allParameters := parameters.Parameters{}
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if cfg.Description == "" {
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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."
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}
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return Tool{
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BaseTool: tools.NewBaseTool(
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cfg,
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tools.GetAnnotationsOrDefault(cfg.Annotations, tools.NewReadOnlyAnnotations),
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tools.Manifest{Description: cfg.Description, Parameters: allParameters.Manifest(), AuthRequired: cfg.AuthRequired},
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allParameters,
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),
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}, nil
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}
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var _ tools.Tool = Tool{}
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type Tool struct {
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tools.BaseTool[Config]
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}
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func (t Tool) Invoke(ctx context.Context, resourceMgr tools.SourceProvider, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {
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source, err := tools.GetCompatibleSource[compatibleSource](resourceMgr, t.Cfg.Source, t.Cfg.Name, t.Cfg.Type)
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if err != nil {
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return nil, util.NewClientServerError("source used is not compatible with the tool", http.StatusInternalServerError, err)
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}
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paramsMap := params.AsMap()
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newParams, err := parameters.GetParams(t.StaticParameters, paramsMap)
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if err != nil {
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return nil, util.NewAgentError("unable to extract standard params", err)
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}
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sliceParams := newParams.AsSlice()
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resp, err := source.RunSQL(ctx, databaseOverviewStatement, sliceParams)
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if err != nil {
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return nil, util.ProcessGeneralError(err)
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}
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return resp, nil
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}
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func (t Tool) ToConfig() tools.ToolConfig {
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return t.Cfg
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}
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