Kyle Isom
3c0b55f9f8
New internal/masterdb/ package for mcp-master cluster state. Separate from the agent's registry because the schemas are fundamentally different (cluster-wide placement vs node-local containers). Tables: nodes, placements, edge_routes. Full CRUD with tests. Follows the same Open/migrate pattern as internal/registry/. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
107 lines
2.9 KiB
Go
107 lines
2.9 KiB
Go
// Package masterdb provides the SQLite database for the mcp-master daemon.
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// It stores the cluster-wide node registry, service placements, and edge routes.
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// This is separate from the agent's registry (internal/registry/) because the
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// master and agent have fundamentally different schemas.
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package masterdb
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import (
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"database/sql"
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"fmt"
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_ "modernc.org/sqlite"
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)
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// Open opens the master database at the given path and runs migrations.
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func Open(path string) (*sql.DB, error) {
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db, err := sql.Open("sqlite", path)
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if err != nil {
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return nil, fmt.Errorf("open database: %w", err)
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}
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for _, pragma := range []string{
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"PRAGMA journal_mode = WAL",
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"PRAGMA foreign_keys = ON",
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"PRAGMA busy_timeout = 5000",
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} {
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if _, err := db.Exec(pragma); err != nil {
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_ = db.Close()
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return nil, fmt.Errorf("exec %q: %w", pragma, err)
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}
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}
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if err := migrate(db); err != nil {
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_ = db.Close()
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return nil, fmt.Errorf("migrate: %w", err)
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}
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return db, nil
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}
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func migrate(db *sql.DB) error {
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_, err := db.Exec(`
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CREATE TABLE IF NOT EXISTS schema_migrations (
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version INTEGER PRIMARY KEY,
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applied_at TEXT NOT NULL DEFAULT (datetime('now'))
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);
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`)
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if err != nil {
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return fmt.Errorf("create migrations table: %w", err)
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}
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for i, m := range migrations {
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version := i + 1
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var count int
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if err := db.QueryRow("SELECT COUNT(*) FROM schema_migrations WHERE version = ?", version).Scan(&count); err != nil {
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return fmt.Errorf("check migration %d: %w", version, err)
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}
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if count > 0 {
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continue
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}
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if _, err := db.Exec(m); err != nil {
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return fmt.Errorf("run migration %d: %w", version, err)
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}
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if _, err := db.Exec("INSERT INTO schema_migrations (version) VALUES (?)", version); err != nil {
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return fmt.Errorf("record migration %d: %w", version, err)
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}
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}
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return nil
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}
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var migrations = []string{
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// Migration 1: cluster state
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`
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CREATE TABLE IF NOT EXISTS nodes (
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name TEXT PRIMARY KEY,
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address TEXT NOT NULL,
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role TEXT NOT NULL DEFAULT 'worker',
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arch TEXT NOT NULL DEFAULT 'amd64',
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status TEXT NOT NULL DEFAULT 'unknown',
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containers INTEGER NOT NULL DEFAULT 0,
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last_heartbeat TEXT,
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created_at TEXT NOT NULL DEFAULT (datetime('now')),
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updated_at TEXT NOT NULL DEFAULT (datetime('now'))
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);
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CREATE TABLE IF NOT EXISTS placements (
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service_name TEXT PRIMARY KEY,
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node TEXT NOT NULL REFERENCES nodes(name),
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tier TEXT NOT NULL DEFAULT 'worker',
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deployed_at TEXT NOT NULL DEFAULT (datetime('now'))
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);
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CREATE TABLE IF NOT EXISTS edge_routes (
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hostname TEXT PRIMARY KEY,
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service_name TEXT NOT NULL,
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edge_node TEXT NOT NULL REFERENCES nodes(name),
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backend_hostname TEXT NOT NULL,
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backend_port INTEGER NOT NULL,
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created_at TEXT NOT NULL DEFAULT (datetime('now'))
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);
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CREATE INDEX IF NOT EXISTS idx_edge_routes_service
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ON edge_routes(service_name);
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`,
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}
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