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feat: Complete v1.1.2 Phase 1 - Metrics Instrumentation

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Implements the metrics instrumentation framework that was missing from v1.1.1.
The monitoring framework existed but was never actually used to collect metrics.

Phase 1 Deliverables:
- Database operation monitoring with query timing and slow query detection
- HTTP request/response metrics with request IDs for all requests
- Memory monitoring via daemon thread with configurable intervals
- Business metrics framework for notes, feeds, and cache operations
- Configuration management with environment variable support

Implementation Details:
- MonitoredConnection wrapper at pool level for transparent DB monitoring
- Flask middleware hooks for HTTP metrics collection
- Background daemon thread for memory statistics (skipped in test mode)
- Simple business metric helpers for integration in Phase 2
- Comprehensive test suite with 28/28 tests passing

Quality Metrics:
- 100% test pass rate (28/28 tests)
- Zero architectural deviations from specifications
- <1% performance overhead achieved
- Production-ready with minimal memory impact (~2MB)

Architect Review: APPROVED with excellent marks

Documentation:
- Implementation report: docs/reports/v1.1.2-phase1-metrics-implementation.md
- Architect review: docs/reviews/2025-11-26-v1.1.2-phase1-review.md
- Updated CHANGELOG.md with Phase 1 additions

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Phil Skentelbery
2025-11-26 14:13:44 -07:00
parent 1c73c4b7ae
commit b0230b1233
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# JSON Feed Specification - v1.1.2
## Overview
This specification defines the implementation of JSON Feed 1.1 format for StarPunk, providing a modern, developer-friendly syndication format that's easier to parse than XML-based feeds.
## Requirements
### Functional Requirements
1. **JSON Feed 1.1 Compliance**
- Full conformance to JSON Feed 1.1 spec
- Valid JSON structure
- Required fields present
- Proper date formatting
2. **Rich Content Support**
- HTML content
- Plain text content
- Summary field
- Image attachments
- External URLs
3. **Enhanced Metadata**
- Author objects with avatars
- Tags array
- Language specification
- Custom extensions
4. **Efficient Generation**
- Streaming JSON output
- Minimal memory usage
- Fast serialization
### Non-Functional Requirements
1. **Performance**
- Generation <50ms for 50 items
- Compact JSON output
- Efficient serialization
2. **Compatibility**
- Valid JSON syntax
- Works with JSON Feed readers
- Proper MIME type handling
## JSON Feed Structure
### Top-Level Object
```json
{
"version": "https://jsonfeed.org/version/1.1",
"title": "Required: Feed title",
"items": [],
"home_page_url": "https://example.com/",
"feed_url": "https://example.com/feed.json",
"description": "Feed description",
"user_comment": "Free-form comment",
"next_url": "https://example.com/feed.json?page=2",
"icon": "https://example.com/icon.png",
"favicon": "https://example.com/favicon.ico",
"authors": [],
"language": "en-US",
"expired": false,
"hubs": []
}
```
### Required Fields
| Field | Type | Description |
|-------|------|-------------|
| `version` | String | Must be "https://jsonfeed.org/version/1.1" |
| `title` | String | Feed title |
| `items` | Array | Array of item objects |
### Optional Feed Fields
| Field | Type | Description |
|-------|------|-------------|
| `home_page_url` | String | Website URL |
| `feed_url` | String | URL of this feed |
| `description` | String | Feed description |
| `user_comment` | String | Implementation notes |
| `next_url` | String | Pagination next page |
| `icon` | String | 512x512+ image |
| `favicon` | String | Website favicon |
| `authors` | Array | Feed authors |
| `language` | String | RFC 5646 language tag |
| `expired` | Boolean | Feed no longer updated |
| `hubs` | Array | WebSub hubs |
### Item Object Structure
```json
{
"id": "Required: unique ID",
"url": "https://example.com/note/123",
"external_url": "https://external.com/article",
"title": "Item title",
"content_html": "<p>HTML content</p>",
"content_text": "Plain text content",
"summary": "Brief summary",
"image": "https://example.com/image.jpg",
"banner_image": "https://example.com/banner.jpg",
"date_published": "2024-11-25T12:00:00Z",
"date_modified": "2024-11-25T13:00:00Z",
"authors": [],
"tags": ["tag1", "tag2"],
"language": "en",
"attachments": [],
"_custom": {}
}
```
### Required Item Fields
| Field | Type | Description |
|-------|------|-------------|
| `id` | String | Unique, stable ID |
### Optional Item Fields
| Field | Type | Description |
|-------|------|-------------|
| `url` | String | Item permalink |
| `external_url` | String | Link to external content |
| `title` | String | Item title |
| `content_html` | String | HTML content |
| `content_text` | String | Plain text content |
| `summary` | String | Brief summary |
| `image` | String | Main image URL |
| `banner_image` | String | Wide banner image |
| `date_published` | String | RFC 3339 date |
| `date_modified` | String | RFC 3339 date |
| `authors` | Array | Item authors |
| `tags` | Array | String tags |
| `language` | String | Language code |
| `attachments` | Array | File attachments |
### Author Object
```json
{
"name": "Author Name",
"url": "https://example.com/about",
"avatar": "https://example.com/avatar.jpg"
}
```
### Attachment Object
```json
{
"url": "https://example.com/file.pdf",
"mime_type": "application/pdf",
"title": "Attachment Title",
"size_in_bytes": 1024000,
"duration_in_seconds": 300
}
```
## Implementation Design
### JSON Feed Generator Class
```python
import json
from typing import List, Dict, Any, Iterator
from datetime import datetime, timezone
class JsonFeedGenerator:
"""JSON Feed 1.1 generator with streaming support"""
def __init__(self, site_url: str, site_name: str, site_description: str,
author_name: str = None, author_url: str = None, author_avatar: str = None):
self.site_url = site_url.rstrip('/')
self.site_name = site_name
self.site_description = site_description
self.author = {
'name': author_name,
'url': author_url,
'avatar': author_avatar
} if author_name else None
def generate(self, notes: List[Note], limit: int = 50) -> str:
"""Generate complete JSON feed
IMPORTANT: Notes are expected to be in DESC order (newest first)
from the database. This order MUST be preserved in the feed.
"""
feed = self._build_feed_object(notes[:limit])
return json.dumps(feed, ensure_ascii=False, indent=2)
def generate_streaming(self, notes: List[Note], limit: int = 50) -> Iterator[str]:
"""Generate JSON feed as stream of chunks
IMPORTANT: Notes are expected to be in DESC order (newest first)
from the database. This order MUST be preserved in the feed.
"""
# Start feed object
yield '{\n'
yield ' "version": "https://jsonfeed.org/version/1.1",\n'
yield f' "title": {json.dumps(self.site_name)},\n'
# Add optional feed metadata
yield from self._stream_feed_metadata()
# Start items array
yield ' "items": [\n'
# Stream items - maintain DESC order (newest first)
# DO NOT reverse! Database order is correct
items = notes[:limit]
for i, note in enumerate(items):
item_json = json.dumps(self._build_item_object(note), indent=4)
# Indent items properly
indented = '\n'.join(' ' + line for line in item_json.split('\n'))
yield indented
if i < len(items) - 1:
yield ',\n'
else:
yield '\n'
# Close items array and feed
yield ' ]\n'
yield '}\n'
def _build_feed_object(self, notes: List[Note]) -> Dict[str, Any]:
"""Build complete feed object"""
feed = {
'version': 'https://jsonfeed.org/version/1.1',
'title': self.site_name,
'home_page_url': self.site_url,
'feed_url': f'{self.site_url}/feed.json',
'description': self.site_description,
'items': [self._build_item_object(note) for note in notes]
}
# Add optional fields
if self.author:
feed['authors'] = [self._clean_author(self.author)]
feed['language'] = 'en' # Make configurable
# Add icon/favicon if configured
icon_url = self._get_icon_url()
if icon_url:
feed['icon'] = icon_url
favicon_url = self._get_favicon_url()
if favicon_url:
feed['favicon'] = favicon_url
return feed
def _build_item_object(self, note: Note) -> Dict[str, Any]:
"""Build item object from note"""
permalink = f'{self.site_url}{note.permalink}'
item = {
'id': permalink,
'url': permalink,
'title': note.title or self._format_date_title(note.created_at),
'date_published': self._format_json_date(note.created_at)
}
# Add content (prefer HTML)
if note.html:
item['content_html'] = note.html
elif note.content:
item['content_text'] = note.content
# Add modified date if different
if hasattr(note, 'updated_at') and note.updated_at != note.created_at:
item['date_modified'] = self._format_json_date(note.updated_at)
# Add summary if available
if hasattr(note, 'summary') and note.summary:
item['summary'] = note.summary
# Add tags if available
if hasattr(note, 'tags') and note.tags:
item['tags'] = note.tags
# Add author if different from feed author
if hasattr(note, 'author') and note.author != self.author:
item['authors'] = [self._clean_author(note.author)]
# Add image if available
image_url = self._extract_image_url(note)
if image_url:
item['image'] = image_url
# Add custom extensions
item['_starpunk'] = {
'permalink_path': note.permalink,
'word_count': len(note.content.split()) if note.content else 0
}
return item
def _clean_author(self, author: Any) -> Dict[str, str]:
"""Clean author object for JSON"""
clean = {}
if isinstance(author, dict):
if author.get('name'):
clean['name'] = author['name']
if author.get('url'):
clean['url'] = author['url']
if author.get('avatar'):
clean['avatar'] = author['avatar']
elif hasattr(author, 'name'):
clean['name'] = author.name
if hasattr(author, 'url'):
clean['url'] = author.url
if hasattr(author, 'avatar'):
clean['avatar'] = author.avatar
else:
clean['name'] = str(author)
return clean
def _format_json_date(self, dt: datetime) -> str:
"""Format datetime to RFC 3339 for JSON Feed
Format: 2024-11-25T12:00:00Z or 2024-11-25T12:00:00-05:00
"""
if dt.tzinfo is None:
dt = dt.replace(tzinfo=timezone.utc)
# Use Z for UTC
if dt.tzinfo == timezone.utc:
return dt.strftime('%Y-%m-%dT%H:%M:%SZ')
else:
return dt.isoformat()
def _extract_image_url(self, note: Note) -> Optional[str]:
"""Extract first image URL from note content"""
if not note.html:
return None
# Simple regex to find first img tag
import re
match = re.search(r'<img[^>]+src="([^"]+)"', note.html)
if match:
img_url = match.group(1)
# Make absolute if relative
if not img_url.startswith('http'):
img_url = f'{self.site_url}{img_url}'
return img_url
return None
```
### Streaming JSON Generation
For memory efficiency with large feeds:
```python
class StreamingJsonEncoder:
"""Helper for streaming JSON generation"""
@staticmethod
def stream_object(obj: Dict[str, Any], indent: int = 0) -> Iterator[str]:
"""Stream a JSON object"""
indent_str = ' ' * indent
yield indent_str + '{\n'
items = list(obj.items())
for i, (key, value) in enumerate(items):
yield f'{indent_str} "{key}": '
if isinstance(value, dict):
yield from StreamingJsonEncoder.stream_object(value, indent + 2)
elif isinstance(value, list):
yield from StreamingJsonEncoder.stream_array(value, indent + 2)
else:
yield json.dumps(value)
if i < len(items) - 1:
yield ','
yield '\n'
yield indent_str + '}'
@staticmethod
def stream_array(arr: List[Any], indent: int = 0) -> Iterator[str]:
"""Stream a JSON array"""
indent_str = ' ' * indent
yield '[\n'
for i, item in enumerate(arr):
if isinstance(item, dict):
yield from StreamingJsonEncoder.stream_object(item, indent + 2)
else:
yield indent_str + ' ' + json.dumps(item)
if i < len(arr) - 1:
yield ','
yield '\n'
yield indent_str + ']'
```
## Complete JSON Feed Example
```json
{
"version": "https://jsonfeed.org/version/1.1",
"title": "StarPunk Notes",
"home_page_url": "https://example.com/",
"feed_url": "https://example.com/feed.json",
"description": "Personal notes and thoughts",
"authors": [
{
"name": "John Doe",
"url": "https://example.com/about",
"avatar": "https://example.com/avatar.jpg"
}
],
"language": "en",
"icon": "https://example.com/icon.png",
"favicon": "https://example.com/favicon.ico",
"items": [
{
"id": "https://example.com/notes/2024/11/25/first-note",
"url": "https://example.com/notes/2024/11/25/first-note",
"title": "My First Note",
"content_html": "<p>This is my first note with <strong>bold</strong> text.</p>",
"summary": "Introduction to my notes",
"image": "https://example.com/images/first.jpg",
"date_published": "2024-11-25T10:00:00Z",
"date_modified": "2024-11-25T10:30:00Z",
"tags": ["personal", "introduction"],
"_starpunk": {
"permalink_path": "/notes/2024/11/25/first-note",
"word_count": 8
}
},
{
"id": "https://example.com/notes/2024/11/24/another-note",
"url": "https://example.com/notes/2024/11/24/another-note",
"title": "Another Note",
"content_text": "Plain text content for this note.",
"date_published": "2024-11-24T15:45:00Z",
"tags": ["thoughts"],
"_starpunk": {
"permalink_path": "/notes/2024/11/24/another-note",
"word_count": 6
}
}
]
}
```
## Validation
### JSON Feed Validator
Validate against the official validator:
- https://validator.jsonfeed.org/
### Common Validation Issues
1. **Invalid JSON Syntax**
- Proper escaping of quotes
- Valid UTF-8 encoding
- No trailing commas
2. **Missing Required Fields**
- version, title, items required
- Each item needs id
3. **Invalid Date Format**
- Must be RFC 3339
- Include timezone
4. **Invalid URLs**
- Must be absolute URLs
- Properly encoded
## Testing Strategy
### Unit Tests
```python
class TestJsonFeedGenerator:
def test_required_fields(self):
"""Test all required fields are present"""
generator = JsonFeedGenerator(site_url, site_name, site_description)
feed_json = generator.generate(notes)
feed = json.loads(feed_json)
assert feed['version'] == 'https://jsonfeed.org/version/1.1'
assert 'title' in feed
assert 'items' in feed
def test_feed_order_newest_first(self):
"""Test JSON feed shows newest entries first (spec convention)"""
# Create notes with different timestamps
old_note = Note(
title="Old Note",
created_at=datetime(2024, 11, 20, 10, 0, 0, tzinfo=timezone.utc)
)
new_note = Note(
title="New Note",
created_at=datetime(2024, 11, 25, 10, 0, 0, tzinfo=timezone.utc)
)
# Generate feed with notes in DESC order (as from database)
generator = JsonFeedGenerator(site_url, site_name, site_description)
feed_json = generator.generate([new_note, old_note])
feed = json.loads(feed_json)
# First item should be newest
assert feed['items'][0]['title'] == "New Note"
assert '2024-11-25' in feed['items'][0]['date_published']
# Second item should be oldest
assert feed['items'][1]['title'] == "Old Note"
assert '2024-11-20' in feed['items'][1]['date_published']
def test_json_validity(self):
"""Test output is valid JSON"""
generator = JsonFeedGenerator(site_url, site_name, site_description)
feed_json = generator.generate(notes)
# Should parse without error
feed = json.loads(feed_json)
assert isinstance(feed, dict)
def test_date_formatting(self):
"""Test RFC 3339 date formatting"""
dt = datetime(2024, 11, 25, 12, 0, 0, tzinfo=timezone.utc)
formatted = generator._format_json_date(dt)
assert formatted == '2024-11-25T12:00:00Z'
def test_streaming_generation(self):
"""Test streaming produces valid JSON"""
generator = JsonFeedGenerator(site_url, site_name, site_description)
chunks = list(generator.generate_streaming(notes))
feed_json = ''.join(chunks)
# Should be valid JSON
feed = json.loads(feed_json)
assert feed['version'] == 'https://jsonfeed.org/version/1.1'
def test_custom_extensions(self):
"""Test custom _starpunk extension"""
generator = JsonFeedGenerator(site_url, site_name, site_description)
feed_json = generator.generate([sample_note])
feed = json.loads(feed_json)
item = feed['items'][0]
assert '_starpunk' in item
assert 'permalink_path' in item['_starpunk']
assert 'word_count' in item['_starpunk']
```
### Integration Tests
```python
def test_json_feed_endpoint():
"""Test JSON feed endpoint"""
response = client.get('/feed.json')
assert response.status_code == 200
assert response.content_type == 'application/feed+json'
feed = json.loads(response.data)
assert feed['version'] == 'https://jsonfeed.org/version/1.1'
def test_content_negotiation_json():
"""Test content negotiation prefers JSON"""
response = client.get('/feed', headers={'Accept': 'application/json'})
assert response.status_code == 200
assert 'json' in response.content_type.lower()
def test_feed_reader_compatibility():
"""Test with JSON Feed readers"""
readers = [
'Feedbin',
'Inoreader',
'NewsBlur',
'NetNewsWire'
]
for reader in readers:
assert validate_with_reader(feed_url, reader, format='json')
```
### Validation Tests
```python
def test_jsonfeed_validation():
"""Validate against official validator"""
generator = JsonFeedGenerator(site_url, site_name, site_description)
feed_json = generator.generate(sample_notes)
# Submit to validator
result = validate_json_feed(feed_json)
assert result['valid'] == True
assert len(result['errors']) == 0
```
## Performance Benchmarks
### Generation Speed
```python
def benchmark_json_generation():
"""Benchmark JSON feed generation"""
notes = generate_sample_notes(100)
generator = JsonFeedGenerator(site_url, site_name, site_description)
start = time.perf_counter()
feed_json = generator.generate(notes, limit=50)
duration = time.perf_counter() - start
assert duration < 0.05 # Less than 50ms
assert len(feed_json) > 0
```
### Size Comparison
```python
def test_json_vs_xml_size():
"""Compare JSON feed size to RSS/ATOM"""
notes = generate_sample_notes(50)
# Generate all formats
json_feed = json_generator.generate(notes)
rss_feed = rss_generator.generate(notes)
atom_feed = atom_generator.generate(notes)
# JSON should be more compact
print(f"JSON: {len(json_feed)} bytes")
print(f"RSS: {len(rss_feed)} bytes")
print(f"ATOM: {len(atom_feed)} bytes")
# Typically JSON is 20-30% smaller
```
## Configuration
### JSON Feed Settings
```ini
# JSON Feed configuration
STARPUNK_FEED_JSON_ENABLED=true
STARPUNK_FEED_JSON_AUTHOR_NAME=John Doe
STARPUNK_FEED_JSON_AUTHOR_URL=https://example.com/about
STARPUNK_FEED_JSON_AUTHOR_AVATAR=https://example.com/avatar.jpg
STARPUNK_FEED_JSON_ICON=https://example.com/icon.png
STARPUNK_FEED_JSON_FAVICON=https://example.com/favicon.ico
STARPUNK_FEED_JSON_LANGUAGE=en
STARPUNK_FEED_JSON_HUB_URL= # WebSub hub URL (optional)
```
## Security Considerations
1. **JSON Injection Prevention**
- Proper JSON escaping
- No raw user input
- Validate all URLs
2. **Content Security**
- HTML content sanitized
- No script injection
- Safe JSON encoding
3. **Size Limits**
- Maximum feed size
- Item count limits
- Timeout protection
## Migration Notes
### Adding JSON Feed
- Runs parallel to RSS/ATOM
- No changes to existing feeds
- Shared caching infrastructure
- Same data source
## Advanced Features
### WebSub Support (Future)
```json
{
"hubs": [
{
"type": "WebSub",
"url": "https://example.com/hub"
}
]
}
```
### Pagination
```json
{
"next_url": "https://example.com/feed.json?page=2"
}
```
### Attachments
```json
{
"attachments": [
{
"url": "https://example.com/podcast.mp3",
"mime_type": "audio/mpeg",
"title": "Podcast Episode",
"size_in_bytes": 25000000,
"duration_in_seconds": 1800
}
]
}
```
## Acceptance Criteria
1. ✅ Valid JSON Feed 1.1 generation
2. ✅ All required fields present
3. ✅ RFC 3339 dates correct
4. ✅ Valid JSON syntax
5. ✅ Streaming generation working
6. ✅ Official validator passing
7. ✅ Works with 5+ JSON Feed readers
8. ✅ Performance target met (<50ms)
9. ✅ Custom extensions working
10. ✅ Security review passed