feat: ja4-platform monorepo — 5 services unified, tests & RPM builds standardized
Services: - ja4sentinel: TLS/JA4 fingerprint capture daemon (Go, libpcap) - logcorrelator: JA4 log correlation engine (Go, ClickHouse) - mod_reqin_log: Apache module (C, JSON request logging) - bot_detector: ML bot detection pipeline (Python) - dashboard: FastAPI/Streamlit analytics UI (Python) Shared libraries: - shared/go/ja4common: logger, config, shutdown, ipfilter (Go module) - shared/python/ja4_common: ClickHouseClient, ClickHouseSettings (Python package) - shared/clickhouse/: canonical SQL migrations (10 files) Build & packaging: - Unified 3-stage Dockerfile.package for Go RPMs (el8/el9/el10) - go.work workspace linking sentinel, correlator, ja4common - Makefile with test-all, build-all, rpm-* targets Fixes applied: - go.work: 1.21 → 1.24.6 (required by sentinel) - correlator Dockerfiles: golang:1.21 → golang:1.24 - replace directives in go.mod for ja4common local path - pyproject.toml: setuptools.backends → setuptools.build_meta - Removed static libpcap linking (unavailable on Rocky 9) - Fixed data races in output/writers_test.go (sync.Mutex + atomic.Int32) - Rewrote corrupted test files (logger_test.go × 2) Test coverage: - correlator: 67.1% total (unixsocket 80.5%, config 91.7%, app 83.3%, multi 87.7%, stdout 100%) - sentinel: all 10 packages pass (api, capture, config, fingerprint, ipfilter, logging, output, tlsparse) Documentation: - README.md + docs/ (architecture, development, 5 services, shared libs, DB schema & migrations) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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# go-ja4common
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`ja4common` is the shared Go library for the ja4-platform, providing unified logging, YAML configuration loading with environment variable overrides, graceful shutdown handling, and IP address filtering. It is used by both [sentinel](../services/sentinel.md) and [correlator](../services/correlator.md).
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**Module path**: `github.com/antitbone/ja4/ja4common`
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**Go version**: 1.21+
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**Dependencies**: `gopkg.in/yaml.v3`
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## Packages
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### logger
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Unified structured logging with two styles:
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- **Prefix+Fields style** (correlator pattern) — `Logger`
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- **Component style** (sentinel pattern) — `ComponentLogger`
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#### Types
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```go
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type LogLevel int
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const (
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DEBUG LogLevel = iota
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INFO
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WARN
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ERROR
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)
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```
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#### Logger API
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| Method | Signature | Description |
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|--------|-----------|-------------|
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| `New` | `New(prefix string) *Logger` | Create logger with INFO level |
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| `NewWithLevel` | `NewWithLevel(prefix, level string) *Logger` | Create logger with specified level |
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| `SetLevel` | `(l *Logger) SetLevel(level string)` | Change minimum log level at runtime |
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| `ShouldLog` | `(l *Logger) ShouldLog(level LogLevel) bool` | Check if level would be logged |
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| `WithFields` | `(l *Logger) WithFields(fields map[string]any) *Logger` | Return new logger with additional fields |
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| `Info` | `(l *Logger) Info(msg string)` | Log info message |
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| `Infof` | `(l *Logger) Infof(msg string, args ...any)` | Log formatted info |
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| `Warn` | `(l *Logger) Warn(msg string)` | Log warning |
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| `Warnf` | `(l *Logger) Warnf(msg string, args ...any)` | Log formatted warning |
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| `Error` | `(l *Logger) Error(msg string, err error)` | Log error with optional error value |
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| `Debug` | `(l *Logger) Debug(msg string)` | Log debug message |
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| `Debugf` | `(l *Logger) Debugf(msg string, args ...any)` | Log formatted debug |
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| `ParseLogLevel` | `ParseLogLevel(level string) LogLevel` | Parse string to LogLevel |
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#### ComponentLogger API
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Wraps `Logger` to satisfy sentinel's component-based logging interface:
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| Method | Signature | Description |
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|--------|-----------|-------------|
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| `NewComponentLogger` | `NewComponentLogger(level string) *ComponentLogger` | Create component logger |
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| `Log` | `(c *ComponentLogger) Log(component, level, message string, details map[string]string)` | Log with component context |
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| `Debug` | `(c *ComponentLogger) Debug(component, message string, details map[string]string)` | Debug with component |
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| `Info` | `(c *ComponentLogger) Info(component, message string, details map[string]string)` | Info with component |
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| `Warn` | `(c *ComponentLogger) Warn(component, message string, details map[string]string)` | Warn with component |
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| `Error` | `(c *ComponentLogger) Error(component, message string, details map[string]string)` | Error with component |
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#### Usage Example
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```go
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import "github.com/antitbone/ja4/ja4common/logger"
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// Prefix+Fields style
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log := logger.NewWithLevel("myservice", "DEBUG")
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log.Info("starting up")
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log.WithFields(map[string]any{"port": 8080}).Info("listening")
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// Component style (sentinel compatibility)
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clog := logger.NewComponentLogger("info")
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clog.Info("capture", "packets received", map[string]string{"count": "1000"})
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```
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---
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### config
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Generic YAML configuration loading with environment variable overrides using struct tags.
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#### API
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| Function | Signature | Description |
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|----------|-----------|-------------|
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| `LoadYAML` | `LoadYAML[T any](path string, optional bool) (T, error)` | Load and unmarshal YAML file |
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| `OverrideFromEnv` | `OverrideFromEnv[T any](cfg *T, envPrefix string) error` | Apply env var overrides via `env` struct tags |
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#### Supported Types for Environment Override
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- `string`
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- `int`, `int8`, `int16`, `int32`, `int64`
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- `uint`, `uint8`, `uint16`, `uint32`, `uint64`
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- `bool`
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- `[]string` (comma-separated)
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#### Usage Example
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```go
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import "github.com/antitbone/ja4/ja4common/config"
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type MyConfig struct {
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Host string `yaml:"host" env:"HOST"`
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Port int `yaml:"port" env:"PORT"`
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Debug bool `yaml:"debug" env:"DEBUG"`
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Tags []string `yaml:"tags" env:"TAGS"`
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}
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// Load YAML (optional=true means missing file returns zero value)
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cfg, err := config.LoadYAML[MyConfig]("config.yml", true)
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// Override from environment (prefix="" means use tag directly)
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err = config.OverrideFromEnv(&cfg, "MYAPP")
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// Reads: MYAPP_HOST, MYAPP_PORT, MYAPP_DEBUG, MYAPP_TAGS
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```
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---
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### shutdown
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Graceful shutdown handler that blocks until `SIGTERM`/`SIGINT`, then runs cleanup hooks.
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#### API
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```go
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type Hook struct {
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Name string
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Fn func() error
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}
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func Handle(ctx context.Context, cancel context.CancelFunc, hooks []Hook, logger simpleLogger)
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```
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The `Handle` function:
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1. Blocks until `SIGTERM`, `SIGINT`, or context cancellation
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2. Calls `cancel()` to propagate shutdown
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3. Runs all hooks in order, logging errors but not aborting
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#### Usage Example
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```go
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import "github.com/antitbone/ja4/ja4common/shutdown"
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ctx, cancel := context.WithCancel(context.Background())
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hooks := []shutdown.Hook{
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{Name: "close-db", Fn: func() error { return db.Close() }},
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{Name: "flush-logs", Fn: func() error { return logger.Flush() }},
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}
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// This blocks until signal received
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shutdown.Handle(ctx, cancel, hooks, myLogger)
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```
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---
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### ipfilter
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IP address and CIDR range matching for source IP exclusion.
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#### API
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| Method | Signature | Description |
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|--------|-----------|-------------|
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| `New` | `New(excludeList []string) (*Filter, error)` | Create filter from IP/CIDR list |
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| `ShouldExclude` | `(f *Filter) ShouldExclude(ipStr string) bool` | Check if IP should be excluded |
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| `Count` | `(f *Filter) Count() (ips int, networks int)` | Return number of loaded entries |
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Accepts: single IPs (`192.168.1.1`), CIDR ranges (`10.0.0.0/8`), IPv6 addresses and ranges.
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#### Usage Example
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```go
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import "github.com/antitbone/ja4/ja4common/ipfilter"
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filter, err := ipfilter.New([]string{
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"10.0.0.0/8",
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"192.168.1.1",
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"2001:db8::/32",
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})
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if filter.ShouldExclude("10.0.0.5") {
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// Skip this IP
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}
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ips, nets := filter.Count() // 1 IP, 2 networks
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```
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## Using from a New Service
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### 1. Add to go.mod
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```bash
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cd services/my-service
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go mod init github.com/antitbone/ja4/my-service
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```
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Add the dependency:
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```
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require github.com/antitbone/ja4/ja4common v0.0.0
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```
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### 2. Add to go.work
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In the repository root `go.work`:
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```
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use (
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./services/sentinel
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./services/correlator
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./services/my-service // ← add
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./shared/go/ja4common
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)
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```
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### 3. Import and Use
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```go
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package main
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import (
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"context"
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"github.com/antitbone/ja4/ja4common/config"
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"github.com/antitbone/ja4/ja4common/logger"
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"github.com/antitbone/ja4/ja4common/shutdown"
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)
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func main() {
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log := logger.NewWithLevel("myservice", "INFO")
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cfg, _ := config.LoadYAML[MyConfig]("config.yml", true)
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config.OverrideFromEnv(&cfg, "MYSERVICE")
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ctx, cancel := context.WithCancel(context.Background())
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shutdown.Handle(ctx, cancel, nil, log)
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}
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```
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### 4. Sync Workspace
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```bash
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go work sync
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```
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