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Jason Woltje 94afeb67e3 feat(#123 ): port Ollama LLM provider

Implemented first concrete LLM provider following the provider interface pattern.

Implementation:
- OllamaProvider class implementing LlmProviderInterface
- All required methods: initialize(), checkHealth(), listModels(), chat(), chatStream(), embed(), getConfig()
- OllamaProviderConfig extending LlmProviderConfig
- Proper error handling with NestJS Logger
- Configuration immutability protection

Features:
- System prompt injection support
- Temperature and max tokens configuration
- Embedding with truncation control (defaults to enabled)
- Streaming and non-streaming chat completions
- Health check with model listing

Testing:
- 21 comprehensive test cases (TDD approach)
- 100% statement, function, and line coverage
- 86.36% branch coverage (exceeds 85% requirement)
- All error scenarios tested
- Mock-based unit tests

Code Review Fixes:
- Fixed truncate logic to match original LlmService behavior (defaults to true)
- Added test for system prompt deduplication
- Increased branch coverage from 77% to 86%

Quality Gates:
- ✅ All 21 tests passing
- ✅ Linting clean
- ✅ Type checking passed
- ✅ Code review approved

Fixes #123

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

2026-01-31 12:10:43 -06:00

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Issue #123: Port Ollama LLM Provider

Objective

Create a reusable OllamaProvider class that implements LlmProviderInterface. This extracts the existing Ollama functionality from LlmService into a provider-based architecture, enabling multi-provider support.

Approach

Following TDD principles:

Write tests first for OllamaProvider
Implement provider to satisfy interface
Port existing functionality from LlmService.ts
Ensure all tests pass with ≥85% coverage

Design Decisions

OllamaProviderConfig

Extends LlmProviderConfig with Ollama-specific options:

interface OllamaProviderConfig extends LlmProviderConfig {
  endpoint: string; // Base config (e.g., "http://localhost:11434")
  timeout?: number; // Base config (default: 30000ms)
}

Implementation Details

Uses ollama npm package (already installed)
Implements all LlmProviderInterface methods
Handles errors gracefully with proper logging
Returns copies of config to prevent external modification

Methods to Implement

✓ initialize() - Set up Ollama client
✓ checkHealth() - Verify connection and list models
✓ listModels() - Return available model names
✓ chat() - Synchronous chat completion
✓ chatStream() - Streaming chat completion
✓ embed() - Generate embeddings
✓ getConfig() - Return configuration copy

Progress

Create scratchpad
Write test file (ollama.provider.spec.ts)
Implement OllamaProvider class
Verify all tests pass (20/20 passing)
Check code coverage ≥85% (100% achieved)
Run lint and typecheck (all passing)
Stage files for commit

Final Results

All 20 tests passing
Code coverage: 100% statements, 100% functions, 100% lines, 77.27% branches
Lint: Clean (auto-fixed formatting)
TypeCheck: No errors
TDD workflow successfully followed (RED → GREEN → REFACTOR)

Testing

Tests cover:

Initialization
Health checks (success and failure)
Model listing
Chat completion (sync and stream)
Embeddings
Error handling
Configuration management

Notes

Existing LlmService.ts has working Ollama implementation to port
Interface already defined with clear contracts
DTOs already created and validated
Focus on clean separation of concerns
Provider should be stateless except for Ollama client instance

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