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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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docs/design/v1.1.2/atom-feed-specification.md Normal file
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# ATOM Feed Specification - v1.1.2
## Overview
This specification defines the implementation of ATOM 1.0 feed generation for StarPunk, providing an alternative syndication format to RSS with enhanced metadata support and standardized content handling.
## Requirements
### Functional Requirements
1. **ATOM 1.0 Compliance**
- Full conformance to RFC 4287
- Valid XML namespace declarations
- Required elements present
- Proper content type handling
2. **Content Support**
- Text content (escaped)
- HTML content (escaped or CDATA)
- XHTML content (inline XML)
- Base64 for binary (future)
3. **Metadata Richness**
- Author information
- Category/tag support
- Updated vs published dates
- Link relationships
4. **Streaming Generation**
- Memory-efficient output
- Chunked response support
- No full document in memory
### Non-Functional Requirements
1. **Performance**
- Generation time <100ms for 50 entries
- Streaming chunks of ~4KB
- Minimal memory footprint
2. **Compatibility**
- Works with major feed readers
- Valid per W3C Feed Validator
- Proper content negotiation
## ATOM Feed Structure
### Namespace and Root Element
```xml
<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom">
<!-- Feed elements here -->
</feed>
```
### Feed-Level Elements
#### Required Elements
| Element | Description | Example |
|---------|-------------|---------|
| `id` | Permanent, unique identifier | `<id>https://example.com/</id>` |
| `title` | Human-readable title | `<title>StarPunk Notes</title>` |
| `updated` | Last significant update | `<updated>2024-11-25T12:00:00Z</updated>` |
#### Recommended Elements
| Element | Description | Example |
|---------|-------------|---------|
| `author` | Feed author | `<author><name>John Doe</name></author>` |
| `link` | Feed relationships | `<link rel="self" href="..."/>` |
| `subtitle` | Feed description | `<subtitle>Personal notes</subtitle>` |
#### Optional Elements
| Element | Description |
|---------|-------------|
| `category` | Categorization scheme |
| `contributor` | Secondary contributors |
| `generator` | Software that generated feed |
| `icon` | Small visual identification |
| `logo` | Larger visual identification |
| `rights` | Copyright/license info |
### Entry-Level Elements
#### Required Elements
| Element | Description | Example |
|---------|-------------|---------|
| `id` | Permanent, unique identifier | `<id>https://example.com/note/123</id>` |
| `title` | Entry title | `<title>My Note Title</title>` |
| `updated` | Last modification | `<updated>2024-11-25T12:00:00Z</updated>` |
#### Recommended Elements
| Element | Description |
|---------|-------------|
| `author` | Entry author (if different from feed) |
| `content` | Full content |
| `link` | Entry URL |
| `summary` | Short summary |
#### Optional Elements
| Element | Description |
|---------|-------------|
| `category` | Entry categories/tags |
| `contributor` | Secondary contributors |
| `published` | Initial publication time |
| `rights` | Entry-specific rights |
| `source` | If republished from elsewhere |
## Implementation Design
### ATOM Generator Class
```python
class AtomGenerator:
"""ATOM 1.0 feed generator with streaming support"""
def __init__(self, site_url: str, site_name: str, site_description: str):
self.site_url = site_url.rstrip('/')
self.site_name = site_name
self.site_description = site_description
def generate(self, notes: List[Note], limit: int = 50) -> Iterator[str]:
"""Generate ATOM 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.
"""
# Yield XML declaration
yield '<?xml version="1.0" encoding="utf-8"?>\n'
# Yield feed opening with namespace
yield '<feed xmlns="http://www.w3.org/2005/Atom">\n'
# Yield feed metadata
yield from self._generate_feed_metadata()
# Yield entries - maintain DESC order (newest first)
# DO NOT reverse! Database order is correct
for note in notes[:limit]:
yield from self._generate_entry(note)
# Yield closing tag
yield '</feed>\n'
def _generate_feed_metadata(self) -> Iterator[str]:
"""Generate feed-level metadata"""
# Required elements
yield f' <id>{self._escape_xml(self.site_url)}/</id>\n'
yield f' <title>{self._escape_xml(self.site_name)}</title>\n'
yield f' <updated>{self._format_atom_date(datetime.now(timezone.utc))}</updated>\n'
# Links
yield f' <link rel="alternate" type="text/html" href="{self._escape_xml(self.site_url)}"/>\n'
yield f' <link rel="self" type="application/atom+xml" href="{self._escape_xml(self.site_url)}/feed.atom"/>\n'
# Optional elements
if self.site_description:
yield f' <subtitle>{self._escape_xml(self.site_description)}</subtitle>\n'
# Generator
yield ' <generator version="1.1.2" uri="https://starpunk.app">StarPunk</generator>\n'
def _generate_entry(self, note: Note) -> Iterator[str]:
"""Generate a single entry"""
permalink = f"{self.site_url}{note.permalink}"
yield ' <entry>\n'
# Required elements
yield f' <id>{self._escape_xml(permalink)}</id>\n'
yield f' <title>{self._escape_xml(note.title)}</title>\n'
yield f' <updated>{self._format_atom_date(note.updated_at or note.created_at)}</updated>\n'
# Link to entry
yield f' <link rel="alternate" type="text/html" href="{self._escape_xml(permalink)}"/>\n'
# Published date (if different from updated)
if note.created_at != note.updated_at:
yield f' <published>{self._format_atom_date(note.created_at)}</published>\n'
# Author (if available)
if hasattr(note, 'author'):
yield ' <author>\n'
yield f' <name>{self._escape_xml(note.author.name)}</name>\n'
if note.author.email:
yield f' <email>{self._escape_xml(note.author.email)}</email>\n'
if note.author.uri:
yield f' <uri>{self._escape_xml(note.author.uri)}</uri>\n'
yield ' </author>\n'
# Content
yield from self._generate_content(note)
# Categories/tags
if hasattr(note, 'tags') and note.tags:
for tag in note.tags:
yield f' <category term="{self._escape_xml(tag)}"/>\n'
yield ' </entry>\n'
def _generate_content(self, note: Note) -> Iterator[str]:
"""Generate content element with proper type"""
# Determine content type based on note format
if note.html:
# HTML content - use escaped HTML
yield ' <content type="html">'
yield self._escape_xml(note.html)
yield '</content>\n'
else:
# Plain text content
yield ' <content type="text">'
yield self._escape_xml(note.content)
yield '</content>\n'
# Add summary if available
if hasattr(note, 'summary') and note.summary:
yield ' <summary type="text">'
yield self._escape_xml(note.summary)
yield '</summary>\n'
```
### Date Formatting
ATOM uses RFC 3339 date format, which is a profile of ISO 8601.
```python
def _format_atom_date(self, dt: datetime) -> str:
"""Format datetime to RFC 3339 for ATOM
Format: 2024-11-25T12:00:00Z or 2024-11-25T12:00:00-05:00
Args:
dt: Datetime object (naive assumed UTC)
Returns:
RFC 3339 formatted string
"""
# Ensure timezone aware
if dt.tzinfo is None:
dt = dt.replace(tzinfo=timezone.utc)
# Format to RFC 3339
# Use 'Z' for UTC, otherwise offset
if dt.tzinfo == timezone.utc:
return dt.strftime('%Y-%m-%dT%H:%M:%SZ')
else:
return dt.strftime('%Y-%m-%dT%H:%M:%S%z')
```
### XML Escaping
```python
def _escape_xml(self, text: str) -> str:
"""Escape special XML characters
Escapes: & < > " '
Args:
text: Text to escape
Returns:
XML-safe escaped text
"""
if not text:
return ''
# Order matters: & must be first
text = text.replace('&', '&amp;')
text = text.replace('<', '&lt;')
text = text.replace('>', '&gt;')
text = text.replace('"', '&quot;')
text = text.replace("'", '&apos;')
return text
```
## Content Type Handling
### Text Content
Plain text, must be escaped:
```xml
<content type="text">This is plain text with &lt;escaped&gt; characters</content>
```
### HTML Content
HTML as escaped text:
```xml
<content type="html">&lt;p&gt;This is &lt;strong&gt;HTML&lt;/strong&gt; content&lt;/p&gt;</content>
```
### XHTML Content (Future)
Well-formed XML inline:
```xml
<content type="xhtml">
<div xmlns="http://www.w3.org/1999/xhtml">
<p>This is <strong>XHTML</strong> content</p>
</div>
</content>
```
## Complete ATOM Feed Example
```xml
<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom">
<id>https://example.com/</id>
<title>StarPunk Notes</title>
<updated>2024-11-25T12:00:00Z</updated>
<link rel="alternate" type="text/html" href="https://example.com"/>
<link rel="self" type="application/atom+xml" href="https://example.com/feed.atom"/>
<subtitle>Personal notes and thoughts</subtitle>
<generator version="1.1.2" uri="https://starpunk.app">StarPunk</generator>
<entry>
<id>https://example.com/notes/2024/11/25/first-note</id>
<title>My First Note</title>
<updated>2024-11-25T10:30:00Z</updated>
<published>2024-11-25T10:00:00Z</published>
<link rel="alternate" type="text/html" href="https://example.com/notes/2024/11/25/first-note"/>
<author>
<name>John Doe</name>
<email>john@example.com</email>
</author>
<content type="html">&lt;p&gt;This is my first note with &lt;strong&gt;bold&lt;/strong&gt; text.&lt;/p&gt;</content>
<category term="personal"/>
<category term="introduction"/>
</entry>
<entry>
<id>https://example.com/notes/2024/11/24/another-note</id>
<title>Another Note</title>
<updated>2024-11-24T15:45:00Z</updated>
<link rel="alternate" type="text/html" href="https://example.com/notes/2024/11/24/another-note"/>
<content type="text">Plain text content for this note.</content>
<summary type="text">A brief summary of the note</summary>
</entry>
</feed>
```
## Validation
### W3C Feed Validator Compliance
The generated ATOM feed must pass validation at:
- https://validator.w3.org/feed/
### Common Validation Issues
1. **Missing Required Elements**
- Ensure id, title, updated are present
- Each entry must have these elements too
2. **Invalid Dates**
- Must be RFC 3339 format
- Include timezone information
3. **Improper Escaping**
- All XML entities must be escaped
- No raw HTML in text content
4. **Namespace Issues**
- Correct namespace declaration
- No prefixed elements without namespace
## Testing Strategy
### Unit Tests
```python
class TestAtomGenerator:
def test_required_elements(self):
"""Test all required ATOM elements are present"""
generator = AtomGenerator(site_url, site_name, site_description)
feed = ''.join(generator.generate(notes))
assert '<id>' in feed
assert '<title>' in feed
assert '<updated>' in feed
def test_feed_order_newest_first(self):
"""Test ATOM feed shows newest entries first (RFC 4287 recommendation)"""
# 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 = AtomGenerator(site_url, site_name, site_description)
feed = ''.join(generator.generate([new_note, old_note]))
# Parse feed and verify order
root = etree.fromstring(feed.encode())
entries = root.findall('{http://www.w3.org/2005/Atom}entry')
# First entry should be newest
first_title = entries[0].find('{http://www.w3.org/2005/Atom}title').text
assert first_title == "New Note"
# Second entry should be oldest
second_title = entries[1].find('{http://www.w3.org/2005/Atom}title').text
assert second_title == "Old Note"
def test_xml_escaping(self):
"""Test special characters are properly escaped"""
note = Note(title="Test & <Special> Characters")
generator = AtomGenerator(site_url, site_name, site_description)
feed = ''.join(generator.generate([note]))
assert '&amp;' in feed
assert '&lt;Special&gt;' in feed
def test_date_formatting(self):
"""Test RFC 3339 date formatting"""
dt = datetime(2024, 11, 25, 12, 0, 0, tzinfo=timezone.utc)
formatted = generator._format_atom_date(dt)
assert formatted == '2024-11-25T12:00:00Z'
def test_streaming_generation(self):
"""Test feed is generated as stream"""
generator = AtomGenerator(site_url, site_name, site_description)
chunks = list(generator.generate(notes))
assert len(chunks) > 1 # Multiple chunks
assert chunks[0].startswith('<?xml')
assert chunks[-1].endswith('</feed>\n')
```
### Integration Tests
```python
def test_atom_feed_endpoint():
"""Test ATOM feed endpoint with content negotiation"""
response = client.get('/feed.atom')
assert response.status_code == 200
assert response.content_type == 'application/atom+xml'
# Parse and validate
feed = etree.fromstring(response.data)
assert feed.tag == '{http://www.w3.org/2005/Atom}feed'
def test_feed_reader_compatibility():
"""Test with popular feed readers"""
readers = [
'Feedly',
'Inoreader',
'NewsBlur',
'The Old Reader'
]
for reader in readers:
# Test parsing with reader's validator
assert validate_with_reader(feed_url, reader)
```
### Validation Tests
```python
def test_w3c_validation():
"""Validate against W3C Feed Validator"""
generator = AtomGenerator(site_url, site_name, site_description)
feed = ''.join(generator.generate(sample_notes))
# Submit to W3C validator API
result = validate_feed(feed, format='atom')
assert result['valid'] == True
assert len(result['errors']) == 0
```
## Performance Benchmarks
### Generation Speed
```python
def benchmark_atom_generation():
"""Benchmark ATOM feed generation"""
notes = generate_sample_notes(100)
generator = AtomGenerator(site_url, site_name, site_description)
start = time.perf_counter()
feed = ''.join(generator.generate(notes, limit=50))
duration = time.perf_counter() - start
assert duration < 0.1 # Less than 100ms
assert len(feed) > 0
```
### Memory Usage
```python
def test_streaming_memory_usage():
"""Verify streaming doesn't load entire feed in memory"""
notes = generate_sample_notes(1000)
generator = AtomGenerator(site_url, site_name, site_description)
initial_memory = get_memory_usage()
# Generate but don't concatenate (streaming)
for chunk in generator.generate(notes):
pass # Process chunk
memory_delta = get_memory_usage() - initial_memory
assert memory_delta < 1 # Less than 1MB increase
```
## Configuration
### ATOM-Specific Settings
```ini
# ATOM feed configuration
STARPUNK_FEED_ATOM_ENABLED=true
STARPUNK_FEED_ATOM_AUTHOR_NAME=John Doe
STARPUNK_FEED_ATOM_AUTHOR_EMAIL=john@example.com
STARPUNK_FEED_ATOM_AUTHOR_URI=https://example.com/about
STARPUNK_FEED_ATOM_ICON=https://example.com/icon.png
STARPUNK_FEED_ATOM_LOGO=https://example.com/logo.png
STARPUNK_FEED_ATOM_RIGHTS=© 2024 John Doe. CC BY-SA 4.0
```
## Security Considerations
1. **XML Injection Prevention**
- All user content must be escaped
- No raw XML from user input
- Validate all URLs
2. **Content Security**
- HTML content properly escaped
- No script tags allowed
- Sanitize all metadata
3. **Resource Limits**
- Maximum feed size limits
- Timeout on generation
- Rate limiting on endpoint
## Migration Notes
### Adding ATOM to Existing RSS
- ATOM runs parallel to RSS
- No changes to existing RSS feed
- Both formats available simultaneously
- Shared caching infrastructure
## Acceptance Criteria
1. ✅ Valid ATOM 1.0 feed generation
2. ✅ All required elements present
3. ✅ RFC 3339 date formatting correct
4. ✅ XML properly escaped
5. ✅ Streaming generation working
6. ✅ W3C validator passing
7. ✅ Works with 5+ major feed readers
8. ✅ Performance target met (<100ms)
9. ✅ Memory efficient streaming
10. ✅ Security review passed