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Implement flattened _meta format for server extensions (#331)

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## Summary

This PR implements the flattened `_meta` format for server extensions as
discussed in #284, replacing the confusing wrapper format with a clean
single-file approach.

**Before (wrapper format):**
```json
{
  "server": { "name": "my-server", "description": "..." },
  "x-publisher": { "build_info": "..." },
  "x-io.modelcontextprotocol.registry": { "id": "...", "published_at": "..." }
}
```

**After (flattened format):**
```json
{
  "name": "my-server",
  "description": "...",
  "_meta": {
    "publisher": { "build_info": "..." },
    "io.modelcontextprotocol.registry": { "id": "...", "published_at": "..." }
  }
}
```

## Key Changes

- **Flattened Format**: Single `ServerJSON` file with structured `_meta`
field
- **Better DX**: Publishers maintain one file instead of separate
server.json + extensions.json
- **MCP Compliance**: Uses standard `_meta` mechanism instead of `x-*`
prefixes
- **Simplified Database**: PostgreSQL now uses simple `id, value` table
structure
- **Type Safety**: Structured `ServerMeta` with known extension fields

## Database Migration

Added migration `003_simplify_to_key_value.sql` that drops the complex
relational structure and creates a simple key-value table. This
significantly simplifies database management.

## Testing

- All core tests passing (validators, service layer)
- Schema validation working for all 10 examples
- Seed data successfully migrated (396 entries)
- Publishing functionality verified

Fixes #284
This commit is contained in:
adam jones 2025-09-01 19:27:23 +01:00 • committed by GitHub
commit 218b0b422d
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1 changed files with 19375 additions and 19670 deletions
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9
internal/database/database.go
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@ -5,7 +5,6 @@ import (
"errors"
apiv0 "github.com/modelcontextprotocol/registry/pkg/api/v0"
"github.com/modelcontextprotocol/registry/pkg/model"
)
// Common database errors
@ -21,16 +20,16 @@ var (
// Database defines the interface for database operations with extension wrapper architecture
type Database interface {
// List retrieves all ServerRecord entries with optional filtering
List(ctx context.Context, filter map[string]any, cursor string, limit int) ([]*apiv0.ServerRecord, string, error)
List(ctx context.Context, filter map[string]any, cursor string, limit int) ([]*apiv0.ServerJSON, string, error)
// GetByID retrieves a single ServerRecord by its ID
GetByID(ctx context.Context, id string) (*apiv0.ServerRecord, error)
GetByID(ctx context.Context, id string) (*apiv0.ServerJSON, error)
// Publish adds a new server to the database with separated server.json and extensions
// The registryMetadata contains metadata determined by the service layer (e.g., is_latest, timestamps)
Publish(ctx context.Context, serverDetail model.ServerJSON, publisherExtensions map[string]interface{}, registryMetadata apiv0.RegistryExtensions) (*apiv0.ServerRecord, error)
Publish(ctx context.Context, serverDetail apiv0.ServerJSON, publisherExtensions map[string]interface{}, registryMetadata apiv0.RegistryExtensions) (*apiv0.ServerJSON, error)
// UpdateLatestFlag updates the is_latest flag for a specific server record
UpdateLatestFlag(ctx context.Context, id string, isLatest bool) error
// UpdateServer updates an existing server record with new server details
UpdateServer(ctx context.Context, id string, serverDetail model.ServerJSON, publisherExtensions map[string]interface{}) (*apiv0.ServerRecord, error)
UpdateServer(ctx context.Context, id string, serverDetail apiv0.ServerJSON, publisherExtensions map[string]interface{}) (*apiv0.ServerJSON, error)
// ImportSeed imports initial data from a seed file
ImportSeed(ctx context.Context, seedFilePath string) error
// Close closes the database connection