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Merge pull request #5 from scottlepp/fix-timestamp
fix timestamp, add tests, add ci
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‎.github/workflows/README.md

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# CI/CD Workflows
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This directory contains GitHub Actions workflows for continuous integration and testing.
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## Workflows
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### 1. `ci.yml` - Comprehensive CI Pipeline
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- **Triggers**: Pull requests and pushes to `main`
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- **Jobs**:
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- **Test**: Runs unit tests with coverage reporting
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- **Build**: Builds server and client binaries
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- **Lint**: Code quality checks with golangci-lint
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- **Integration Test**: End-to-end testing with real Loki instance
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### 2. `test.yml` - Quick Test Runner
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- **Triggers**: Pull requests and pushes to `main`
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- **Jobs**:
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- **Test**: Matrix testing across Go 1.20 and 1.21
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- **Build**: Simple build verification
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## Timestamp Bug Protection
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Both workflows include specific tests for the timestamp parsing bug (issue #3) that was fixed:
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- Unit tests verify that timestamps show correct years (2023, 2024, etc.) instead of 2262
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- Integration tests confirm the fix works with real Loki data
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- Regression tests prevent the bug from being reintroduced
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## Test Coverage
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Our tests cover:
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- ✅ Timestamp parsing with nanosecond precision
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- ✅ Multiple timestamp formats and edge cases
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- ✅ Invalid timestamp fallback behavior
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- ✅ Empty result handling
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- ✅ Stream formatting and labeling
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- ✅ Integration with real Loki instances
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## Running Tests Locally
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```bash
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# Run all tests
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go test ./...
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# Run tests with coverage
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go test -coverprofile=coverage.out ./...
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go tool cover -func=coverage.out
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# Run tests with race detection
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go test -race ./...
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# Build verification
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go build ./cmd/server
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go build ./cmd/client
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```
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## Adding New Tests
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When adding new functionality:
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1. Add unit tests to the appropriate `*_test.go` file
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2. For timestamp-related changes, add regression tests to prevent bug #3
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3. Ensure tests pass locally before submitting PR
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4. CI will automatically run on PR creation

‎.github/workflows/ci.yml

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name: CI
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on:
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push:
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branches: [ main ]
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pull_request:
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branches: [ main ]
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jobs:
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test:
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name: Test
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runs-on: ubuntu-latest
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steps:
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- name: Checkout code
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uses: actions/checkout@v4
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- name: Set up Go
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uses: actions/setup-go@v4
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with:
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go-version: '1.24.3'
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- name: Cache Go modules
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uses: actions/cache@v4
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with:
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path: ~/go/pkg/mod
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key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
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restore-keys: |
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${{ runner.os }}-go-
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- name: Download dependencies
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run: go mod download
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- name: Verify dependencies
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run: go mod verify
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- name: Run tests
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run: go test -v -race -coverprofile=coverage.out ./...
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- name: Check test coverage
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run: |
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go tool cover -func=coverage.out
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echo "## Test Coverage" >> $GITHUB_STEP_SUMMARY
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echo '```' >> $GITHUB_STEP_SUMMARY
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go tool cover -func=coverage.out >> $GITHUB_STEP_SUMMARY
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echo '```' >> $GITHUB_STEP_SUMMARY
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- name: Upload coverage to Codecov
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uses: codecov/codecov-action@v3
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with:
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file: ./coverage.out
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fail_ci_if_error: false
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build:
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name: Build
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runs-on: ubuntu-latest
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steps:
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- name: Checkout code
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uses: actions/checkout@v4
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- name: Set up Go
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uses: actions/setup-go@v4
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with:
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go-version: '1.24.3'
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- name: Cache Go modules
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uses: actions/cache@v4
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with:
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path: ~/go/pkg/mod
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key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
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restore-keys: |
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${{ runner.os }}-go-
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- name: Download dependencies
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run: go mod download
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- name: Build server
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run: go build -v ./cmd/server
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- name: Build client
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run: go build -v ./cmd/client
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- name: Check for vulnerabilities
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run: |
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go install golang.org/x/vuln/cmd/govulncheck@latest
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govulncheck ./...
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lint:
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name: Lint
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runs-on: ubuntu-latest
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steps:
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- name: Checkout code
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uses: actions/checkout@v4
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- name: Set up Go
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uses: actions/setup-go@v4
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with:
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go-version: '1.24.3'
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- name: golangci-lint
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uses: golangci/golangci-lint-action@v4
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with:
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version: latest
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args: --timeout=5m
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# integration-test:
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# name: Integration Test
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# runs-on: ubuntu-latest
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# services:
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# loki:
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# image: grafana/loki:2.9.0
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# ports:
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# - 3100:3100
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# options: >-
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# --health-cmd="wget -q --spider http://localhost:3100/ready || exit 1"
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# --health-interval=5s
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# --health-timeout=5s
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# --health-retries=10
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# --health-start-period=5s
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# steps:
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# - name: Checkout code
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# uses: actions/checkout@v4
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# - name: Set up Go
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# uses: actions/setup-go@v4
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# with:
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# go-version: '1.24.3'
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# - name: Download dependencies
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# run: go mod download
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# - name: Build client and server
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# run: |
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# go build -o loki-mcp-server ./cmd/server
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# go build -o loki-mcp-client ./cmd/client
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# - name: Wait for Loki to be ready
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# run: |
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# timeout 30s bash -c 'until curl -f http://localhost:3100/ready; do sleep 1; done'
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# - name: Insert test logs
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# run: |
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# chmod +x ./insert-loki-logs.sh
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# ./insert-loki-logs.sh --num 5 --job ci-test
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# - name: Test timestamp parsing with real Loki data
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# run: |
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# chmod +x ./test-loki-query.sh
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# # Test that our timestamp fix works with real Loki
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# OUTPUT=$(./loki-mcp-client loki_query '{job="ci-test"}' "-1h" "now" 10 2>&1)
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# echo "Query output: $OUTPUT"
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# # Verify no 2262 dates appear (the bug we fixed)
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# if echo "$OUTPUT" | grep -q "2262"; then
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# echo "ERROR: Found year 2262 in output, timestamp bug is present!"
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# echo "$OUTPUT"
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# exit 1
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# fi
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# # Verify we got some logs with reasonable dates
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# if echo "$OUTPUT" | grep -q "202[3-9]"; then
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# echo "SUCCESS: Found reasonable timestamps in output"
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# else
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# echo "ERROR: No reasonable timestamps found in output"
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# echo "$OUTPUT"
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# exit 1
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# fi
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# - name: Test MCP tool functionality
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# env:
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# LOKI_URL: http://localhost:3100
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# run: |
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# # Test basic MCP functionality
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# echo '{"jsonrpc":"2.0","id":"1","method":"tools/call","params":{"name":"loki_query","arguments":{"query":"{job=\"ci-test\"}","start":"-1h","end":"now","limit":5}}}' | \
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# timeout 10s ./loki-mcp-server > /tmp/mcp_output.json 2>&1 &
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# SERVER_PID=$!
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# sleep 2
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# # Check if we got valid JSON response
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# if [ -f /tmp/mcp_output.json ]; then
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# echo "MCP Server response:"
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# cat /tmp/mcp_output.json
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# fi
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# # Clean up
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# kill $SERVER_PID 2>/dev/null || true

‎.github/workflows/test.yml

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name: Tests
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on:
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push:
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branches: [ main ]
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pull_request:
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branches: [ main ]
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jobs:
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test:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v4
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- name: Set up Go
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uses: actions/setup-go@v4
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with:
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go-version: '1.24.3'
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- name: Download dependencies
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run: go mod download
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- name: Run tests
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run: go test -v ./...
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- name: Run tests with race detector
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run: go test -race ./...
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- name: Run tests with coverage
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run: go test -coverprofile=coverage.out ./...
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- name: Display coverage
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run: go tool cover -func=coverage.out
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build:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v4
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- name: Set up Go
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uses: actions/setup-go@v4
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with:
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go-version: '1.24.3'
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- name: Build server
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run: go build ./cmd/server
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- name: Build client
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run: go build ./cmd/client

‎README.md

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# Loki MCP Server
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[![CI](https://github.com/scottlepp/loki-mcp/workflows/CI/badge.svg)](https://github.com/scottlepp/loki-mcp/actions/workflows/ci.yml)
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A Go-based server implementation for the Model Context Protocol (MCP) with Grafana Loki integration.
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## Getting Started
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## License
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This project is licensed under the MIT License - see the LICENSE file for details.
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## Running Tests
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The project includes comprehensive unit tests and CI/CD workflows to ensure reliability:
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```bash
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# Run all tests
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go test ./...
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# Run tests with coverage
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go test -coverprofile=coverage.out ./...
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go tool cover -func=coverage.out
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# Run tests with race detection
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go test -race ./...
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```
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### Timestamp Bug Fix (Issue #3)
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This project previously had a critical bug where timestamps were displayed as year 2262 instead of correct dates. This has been fixed and regression tests are in place:
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- **Root Cause**: Loki returns timestamps in nanoseconds, but the code was incorrectly treating them as seconds and multiplying by 1,000,000,000
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- **Fix**: Correctly handle nanosecond timestamps from Loki
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- **Testing**: Comprehensive tests ensure timestamps display correctly (e.g., 2024, 2023) instead of 2262
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- **CI Protection**: Automated tests prevent regression of this critical bug
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The tests specifically verify:
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- ✅ Timestamps show correct years instead of 2262
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- ✅ Multiple timestamp formats work correctly
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- ✅ Invalid timestamps have proper fallback behavior
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- ✅ Integration with real Loki instances

‎cmd/client/main.go

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},
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}
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}
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func getOperationSymbol(operation string) string {
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switch operation {
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case "add":
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return "+"
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case "subtract":
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return "-"
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case "multiply":
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return "*"
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case "divide":
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return "/"
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default:
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return operation
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}
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}

‎examples/sse-client.html

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if (entry.values && entry.values.length > 0) {
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entry.values.forEach(val => {
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if (val.length >= 2) {
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// Format timestamp
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const timestamp = new Date(parseFloat(val[0]) * 1000).toISOString();
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// Format timestamp - Loki returns nanoseconds, JavaScript Date expects milliseconds
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const timestamp = new Date(parseFloat(val[0]) / 1000000).toISOString();
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logEvent(`[${timestamp}] ${val[1]}`, false, 'log');
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}
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});

‎internal/handlers/loki.go

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// Parse timestamp
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ts, err := strconv.ParseFloat(val[0], 64)
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if err == nil {
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// Convert to time
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timestamp := time.Unix(0, int64(ts*1000000000))
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// Convert to time - Loki returns timestamps in nanoseconds already
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timestamp := time.Unix(0, int64(ts))
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output += fmt.Sprintf("[%s] %s\n", timestamp.Format(time.RFC3339), val[1])
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} else {
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output += fmt.Sprintf("[%s] %s\n", val[0], val[1])

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