Initial revisin of healthchecker, inspired by HAProxy
This commit is contained in:
368
internal/config/config.go
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368
internal/config/config.go
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@@ -0,0 +1,368 @@
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package config
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import (
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"fmt"
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"net"
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"os"
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"regexp"
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"strconv"
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"strings"
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"time"
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"gopkg.in/yaml.v3"
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)
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// Frontend is the parsed and validated representation of frontend.yaml.
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type Frontend struct {
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ProbeIPv4Src net.IP
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ProbeIPv6Src net.IP
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HealthCheckNetns string
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HealthChecker HealthCheckerConfig
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VIPs map[string]VIP
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}
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// HealthCheckerConfig holds global health checker settings.
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type HealthCheckerConfig struct {
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TransitionHistory int
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}
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// VIP is a single virtual IP entry.
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type VIP struct {
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Description string
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Address net.IP
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Protocol string // "tcp", "udp", or "" (all traffic)
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Port uint16 // 0 means omitted (all ports)
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Backends []net.IP
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HealthCheck HealthCheck
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}
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// HealthCheck describes how to probe backends for a VIP.
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type HealthCheck struct {
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Type string
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HTTP *HTTPParams // non-nil for type http and https
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TCP *TCPParams // non-nil for type tcp
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Interval time.Duration
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FastInterval time.Duration // optional; used while health counter is degraded
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DownInterval time.Duration // optional; used while fully down
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Timeout time.Duration
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Rise int // default 2
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Fall int // default 3
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}
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// HTTPParams holds validated parameters for http/https health checks.
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type HTTPParams struct {
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Path string
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Host string // Host header; defaults to backend IP if empty
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ResponseCodeMin int // inclusive lower bound; default 200
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ResponseCodeMax int // inclusive upper bound; default 200
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ResponseRegexp *regexp.Regexp // nil if not configured
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ServerName string // TLS SNI; falls back to Host if empty (https only)
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InsecureSkipVerify bool // skip TLS certificate verification (https only)
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}
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// TCPParams holds validated parameters for tcp health checks.
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type TCPParams struct {
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SSL bool
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ServerName string
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InsecureSkipVerify bool
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BannerRegexp *regexp.Regexp // nil if not configured; matched against the first line sent by the server
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}
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// ---- raw YAML types --------------------------------------------------------
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type rawConfig struct {
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Maglev struct {
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Frontend rawFrontend `yaml:"frontend"`
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} `yaml:"maglev"`
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}
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type rawFrontend struct {
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ProbeIPv4Src string `yaml:"probe-ipv4-src"`
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ProbeIPv6Src string `yaml:"probe-ipv6-src"`
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HealthCheckNetns string `yaml:"healthcheck-netns"`
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HealthChecker rawHealthCheckerCfg `yaml:"healthchecker"`
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VIPs map[string]rawVIP `yaml:"vips"`
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}
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type rawHealthCheckerCfg struct {
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TransitionHistory int `yaml:"transition-history"`
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}
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type rawVIP struct {
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Description string `yaml:"description"`
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Address string `yaml:"address"`
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Protocol string `yaml:"protocol"`
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Port uint16 `yaml:"port"`
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Backends []string `yaml:"backends"`
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HealthCheck rawHealthCheck `yaml:"healthcheck"`
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}
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type rawHealthCheck struct {
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Type string `yaml:"type"`
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Params rawParams `yaml:"params"`
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Interval string `yaml:"interval"`
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FastInterval string `yaml:"fast-interval"`
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DownInterval string `yaml:"down-interval"`
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Timeout string `yaml:"timeout"`
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Rise int `yaml:"rise"`
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Fall int `yaml:"fall"`
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}
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type rawParams struct {
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// HTTP / HTTPS
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Path string `yaml:"path"`
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Host string `yaml:"host"`
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ResponseCode string `yaml:"response-code"`
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ResponseRegexp string `yaml:"response-regexp"`
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ServerName string `yaml:"server-name"`
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InsecureSkipVerify bool `yaml:"insecure-skip-verify"`
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// TCP
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SSL bool `yaml:"ssl"`
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}
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// ---- Load ------------------------------------------------------------------
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// Load reads and validates the config file at path.
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func Load(path string) (*Frontend, error) {
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data, err := os.ReadFile(path)
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if err != nil {
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return nil, fmt.Errorf("read config %q: %w", path, err)
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}
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return parse(data)
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}
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func parse(data []byte) (*Frontend, error) {
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var raw rawConfig
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if err := yaml.Unmarshal(data, &raw); err != nil {
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return nil, fmt.Errorf("parse yaml: %w", err)
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}
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return convert(&raw.Maglev.Frontend)
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}
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func convert(r *rawFrontend) (*Frontend, error) {
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f := &Frontend{}
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var err error
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if f.ProbeIPv4Src, err = parseOptionalIPFamily(r.ProbeIPv4Src, 4, "probe-ipv4-src"); err != nil {
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return nil, err
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}
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if f.ProbeIPv6Src, err = parseOptionalIPFamily(r.ProbeIPv6Src, 6, "probe-ipv6-src"); err != nil {
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return nil, err
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}
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f.HealthCheckNetns = r.HealthCheckNetns
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f.HealthChecker.TransitionHistory = r.HealthChecker.TransitionHistory
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if f.HealthChecker.TransitionHistory == 0 {
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f.HealthChecker.TransitionHistory = 5
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}
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if f.HealthChecker.TransitionHistory < 1 {
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return nil, fmt.Errorf("healthchecker.transition-history must be >= 1")
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}
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f.VIPs = make(map[string]VIP, len(r.VIPs))
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for name, rv := range r.VIPs {
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vip, err := convertVIP(name, &rv)
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if err != nil {
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return nil, fmt.Errorf("vip %q: %w", name, err)
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}
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f.VIPs[name] = vip
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}
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return f, nil
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}
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func convertVIP(name string, r *rawVIP) (VIP, error) {
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v := VIP{
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Description: r.Description,
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Protocol: r.Protocol,
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Port: r.Port,
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}
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ip := net.ParseIP(r.Address)
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if ip == nil {
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return VIP{}, fmt.Errorf("invalid address %q", r.Address)
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}
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v.Address = ip
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switch r.Protocol {
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case "", "tcp", "udp":
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default:
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return VIP{}, fmt.Errorf("protocol must be \"tcp\", \"udp\", or omitted, got %q", r.Protocol)
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}
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if r.Port != 0 && r.Protocol == "" {
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return VIP{}, fmt.Errorf("port requires protocol to be set")
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}
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if r.Protocol != "" && r.Port == 0 {
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return VIP{}, fmt.Errorf("protocol %q requires port to be set (1-65535)", r.Protocol)
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}
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if len(r.Backends) == 0 {
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return VIP{}, fmt.Errorf("backends must not be empty")
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}
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var firstFamily int
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for i, bs := range r.Backends {
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ip := net.ParseIP(bs)
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if ip == nil {
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return VIP{}, fmt.Errorf("backend[%d] %q is not a valid IP", i, bs)
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}
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fam := ipFamily(ip)
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if i == 0 {
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firstFamily = fam
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} else if fam != firstFamily {
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return VIP{}, fmt.Errorf("backend[%d] %q has different address family than backend[0]", i, bs)
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}
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v.Backends = append(v.Backends, ip)
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}
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hc, err := convertHealthCheck(&r.HealthCheck)
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if err != nil {
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return VIP{}, fmt.Errorf("healthcheck: %w", err)
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}
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v.HealthCheck = hc
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return v, nil
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}
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func convertHealthCheck(r *rawHealthCheck) (HealthCheck, error) {
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h := HealthCheck{
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Type: r.Type,
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}
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switch r.Type {
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case "icmp":
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// no params
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case "tcp":
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h.TCP = &TCPParams{
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SSL: r.Params.SSL,
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ServerName: r.Params.ServerName,
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InsecureSkipVerify: r.Params.InsecureSkipVerify,
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}
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case "http", "https":
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if r.Params.Path == "" {
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return HealthCheck{}, fmt.Errorf("type http requires params.path")
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}
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min, max, err := parseCodeRange(r.Params.ResponseCode, 200)
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if err != nil {
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return HealthCheck{}, err
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}
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hp := &HTTPParams{
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Path: r.Params.Path,
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Host: r.Params.Host,
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ResponseCodeMin: min,
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ResponseCodeMax: max,
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InsecureSkipVerify: r.Params.InsecureSkipVerify,
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}
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// TLS SNI: server-name takes precedence, falls back to host.
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hp.ServerName = r.Params.ServerName
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if hp.ServerName == "" {
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hp.ServerName = r.Params.Host
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}
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if r.Params.ResponseRegexp != "" {
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re, err := regexp.Compile(r.Params.ResponseRegexp)
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if err != nil {
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return HealthCheck{}, fmt.Errorf("invalid response-regexp %q: %w", r.Params.ResponseRegexp, err)
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}
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hp.ResponseRegexp = re
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}
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h.HTTP = hp
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default:
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return HealthCheck{}, fmt.Errorf("type must be \"icmp\", \"tcp\", \"http\", or \"https\", got %q", r.Type)
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}
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var err error
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if r.Interval == "" {
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return HealthCheck{}, fmt.Errorf("interval is required")
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}
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if h.Interval, err = time.ParseDuration(r.Interval); err != nil || h.Interval <= 0 {
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return HealthCheck{}, fmt.Errorf("interval %q must be a positive duration", r.Interval)
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}
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if r.FastInterval != "" {
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if h.FastInterval, err = time.ParseDuration(r.FastInterval); err != nil || h.FastInterval <= 0 {
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return HealthCheck{}, fmt.Errorf("fast-interval %q must be a positive duration", r.FastInterval)
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}
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}
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if r.DownInterval != "" {
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if h.DownInterval, err = time.ParseDuration(r.DownInterval); err != nil || h.DownInterval <= 0 {
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return HealthCheck{}, fmt.Errorf("down-interval %q must be a positive duration", r.DownInterval)
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}
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}
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if r.Timeout == "" {
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return HealthCheck{}, fmt.Errorf("timeout is required")
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}
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if h.Timeout, err = time.ParseDuration(r.Timeout); err != nil || h.Timeout <= 0 {
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return HealthCheck{}, fmt.Errorf("timeout %q must be a positive duration", r.Timeout)
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}
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h.Fall = r.Fall
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if h.Fall == 0 {
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h.Fall = 3
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}
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if h.Fall < 1 {
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return HealthCheck{}, fmt.Errorf("fall must be >= 1")
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}
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h.Rise = r.Rise
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if h.Rise == 0 {
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h.Rise = 2
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}
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if h.Rise < 1 {
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return HealthCheck{}, fmt.Errorf("rise must be >= 1")
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}
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return h, nil
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}
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// ---- helpers ---------------------------------------------------------------
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// parseOptionalIPFamily parses s as an IP of the given family.
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// Returns nil (no error) if s is empty.
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func parseOptionalIPFamily(s string, family int, field string) (net.IP, error) {
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if s == "" {
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return nil, nil
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}
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ip := net.ParseIP(s)
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if ip == nil {
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return nil, fmt.Errorf("%s %q is not a valid IP address", field, s)
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}
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if ipFamily(ip) != family {
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return nil, fmt.Errorf("%s %q must be an IPv%d address", field, s, family)
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}
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return ip, nil
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}
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// ipFamily returns 4 for IPv4, 6 for IPv6.
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func ipFamily(ip net.IP) int {
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if ip.To4() != nil {
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return 4
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}
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return 6
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}
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// parseCodeRange parses a response-code value which may be a single integer
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// ("200") or an inclusive range ("200-299"). Returns (min, max, err).
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func parseCodeRange(s string, defaultCode int) (min, max int, err error) {
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if s == "" {
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return defaultCode, defaultCode, nil
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}
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if idx := strings.IndexByte(s, '-'); idx > 0 {
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min, err = strconv.Atoi(s[:idx])
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if err != nil {
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return 0, 0, fmt.Errorf("invalid response-code range %q", s)
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}
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max, err = strconv.Atoi(s[idx+1:])
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if err != nil {
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return 0, 0, fmt.Errorf("invalid response-code range %q", s)
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}
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return min, max, nil
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}
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min, err = strconv.Atoi(s)
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if err != nil {
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return 0, 0, fmt.Errorf("invalid response-code %q", s)
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}
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return min, min, nil
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}
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408
internal/config/config_test.go
Normal file
408
internal/config/config_test.go
Normal file
@@ -0,0 +1,408 @@
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package config
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import (
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"testing"
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"time"
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)
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const validConfig = `
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maglev:
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frontend:
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probe-ipv4-src: 10.0.0.1
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probe-ipv6-src: 2001:db8:1::1
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healthcheck-netns: dataplane
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healthchecker:
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transition-history: 5
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vips:
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web4:
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description: "IPv4 VIP"
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address: 192.0.2.1
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protocol: tcp
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port: 80
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backends: [2001:db8:2::1, 2001:db8:2::2]
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healthcheck:
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type: http
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params:
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path: /healthz
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host: example.com
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response-code: "200"
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interval: 2s
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timeout: 3s
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rise: 2
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fall: 3
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web6:
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description: "IPv6 VIP"
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address: 2001:db8::1
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protocol: tcp
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port: 443
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backends: [2001:db8:2::1, 2001:db8:2::2]
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healthcheck:
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type: icmp
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interval: 1s
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timeout: 3s
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fall: 5
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`
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func TestValidConfig(t *testing.T) {
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f, err := parse([]byte(validConfig))
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if err != nil {
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t.Fatalf("unexpected error: %v", err)
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}
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if f.ProbeIPv4Src.String() != "10.0.0.1" {
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t.Errorf("probe-ipv4-src: got %s, want 10.0.0.1", f.ProbeIPv4Src)
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}
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if f.ProbeIPv6Src.String() != "2001:db8:1::1" {
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t.Errorf("probe-ipv6-src: got %s, want 2001:db8:1::1", f.ProbeIPv6Src)
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}
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if f.HealthCheckNetns != "dataplane" {
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t.Errorf("healthcheck-netns: got %q, want %q", f.HealthCheckNetns, "dataplane")
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}
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if f.HealthChecker.TransitionHistory != 5 {
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t.Errorf("transition-history: got %d, want 5", f.HealthChecker.TransitionHistory)
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}
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if len(f.VIPs) != 2 {
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t.Fatalf("vips: got %d, want 2", len(f.VIPs))
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}
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web4 := f.VIPs["web4"]
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if web4.HealthCheck.Type != "http" {
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t.Errorf("web4 healthcheck type: got %q, want http", web4.HealthCheck.Type)
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}
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if web4.HealthCheck.Fall != 3 {
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t.Errorf("web4 fall: got %d, want 3", web4.HealthCheck.Fall)
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}
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if web4.HealthCheck.Rise != 2 {
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t.Errorf("web4 rise: got %d, want 2", web4.HealthCheck.Rise)
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}
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if web4.HealthCheck.HTTP == nil {
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t.Fatal("web4 HTTP params should not be nil")
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}
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if web4.HealthCheck.HTTP.Path != "/healthz" {
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t.Errorf("web4 params.path: got %q, want /healthz", web4.HealthCheck.HTTP.Path)
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}
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if web4.HealthCheck.HTTP.Host != "example.com" {
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t.Errorf("web4 params.host: got %q, want example.com", web4.HealthCheck.HTTP.Host)
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}
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if web4.HealthCheck.HTTP.ResponseCodeMin != 200 || web4.HealthCheck.HTTP.ResponseCodeMax != 200 {
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t.Errorf("web4 response-code: got %d-%d, want 200-200",
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web4.HealthCheck.HTTP.ResponseCodeMin, web4.HealthCheck.HTTP.ResponseCodeMax)
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}
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web6 := f.VIPs["web6"]
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if web6.HealthCheck.Fall != 5 {
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t.Errorf("web6 fall: got %d, want 5", web6.HealthCheck.Fall)
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}
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}
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func TestDefaults(t *testing.T) {
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cfg := `
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maglev:
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frontend:
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vips:
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v:
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address: 192.0.2.1
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backends: [10.0.0.2]
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healthcheck:
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type: icmp
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interval: 1s
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timeout: 2s
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`
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f, err := parse([]byte(cfg))
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if err != nil {
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t.Fatalf("unexpected error: %v", err)
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}
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if f.HealthCheckNetns != "" {
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t.Errorf("default healthcheck-netns: got %q, want empty (default netns)", f.HealthCheckNetns)
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}
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if f.HealthChecker.TransitionHistory != 5 {
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t.Errorf("default transition-history: got %d, want 5", f.HealthChecker.TransitionHistory)
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}
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hc := f.VIPs["v"].HealthCheck
|
||||
if hc.Rise != 2 {
|
||||
t.Errorf("default rise: got %d, want 2", hc.Rise)
|
||||
}
|
||||
if hc.Fall != 3 {
|
||||
t.Errorf("default fall: got %d, want 3", hc.Fall)
|
||||
}
|
||||
if f.ProbeIPv4Src != nil {
|
||||
t.Errorf("probe-ipv4-src should be nil when omitted, got %s", f.ProbeIPv4Src)
|
||||
}
|
||||
}
|
||||
|
||||
func TestOptionalIntervals(t *testing.T) {
|
||||
cfg := `
|
||||
maglev:
|
||||
frontend:
|
||||
vips:
|
||||
v:
|
||||
address: 192.0.2.1
|
||||
backends: [10.0.0.2]
|
||||
healthcheck:
|
||||
type: icmp
|
||||
interval: 2s
|
||||
fast-interval: 500ms
|
||||
down-interval: 30s
|
||||
timeout: 1s
|
||||
`
|
||||
f, err := parse([]byte(cfg))
|
||||
if err != nil {
|
||||
t.Fatalf("unexpected error: %v", err)
|
||||
}
|
||||
hc := f.VIPs["v"].HealthCheck
|
||||
if hc.Interval != 2*time.Second {
|
||||
t.Errorf("interval: got %v, want 2s", hc.Interval)
|
||||
}
|
||||
if hc.FastInterval != 500*time.Millisecond {
|
||||
t.Errorf("fast-interval: got %v, want 500ms", hc.FastInterval)
|
||||
}
|
||||
if hc.DownInterval != 30*time.Second {
|
||||
t.Errorf("down-interval: got %v, want 30s", hc.DownInterval)
|
||||
}
|
||||
}
|
||||
|
||||
func TestTCPType(t *testing.T) {
|
||||
cfg := `
|
||||
maglev:
|
||||
frontend:
|
||||
vips:
|
||||
v:
|
||||
address: 192.0.2.1
|
||||
protocol: tcp
|
||||
port: 80
|
||||
backends: [10.0.0.2]
|
||||
healthcheck:
|
||||
type: tcp
|
||||
interval: 1s
|
||||
timeout: 2s
|
||||
`
|
||||
f, err := parse([]byte(cfg))
|
||||
if err != nil {
|
||||
t.Fatalf("unexpected error: %v", err)
|
||||
}
|
||||
if f.VIPs["v"].HealthCheck.Type != "tcp" {
|
||||
t.Errorf("type: got %q, want tcp", f.VIPs["v"].HealthCheck.Type)
|
||||
}
|
||||
}
|
||||
|
||||
func TestValidationErrors(t *testing.T) {
|
||||
// Minimal valid base to build error cases on top of.
|
||||
base := func(override string) string {
|
||||
return `
|
||||
maglev:
|
||||
frontend:
|
||||
vips:
|
||||
v:
|
||||
address: 192.0.2.1
|
||||
backends: [10.0.0.2]
|
||||
healthcheck:
|
||||
type: icmp
|
||||
interval: 1s
|
||||
timeout: 2s
|
||||
` + override
|
||||
}
|
||||
_ = base
|
||||
|
||||
tests := []struct {
|
||||
name string
|
||||
yaml string
|
||||
errSub string
|
||||
}{
|
||||
{
|
||||
name: "wrong family probe-ipv4-src",
|
||||
yaml: `
|
||||
maglev:
|
||||
frontend:
|
||||
probe-ipv4-src: 2001:db8::1
|
||||
vips:
|
||||
v:
|
||||
address: 192.0.2.1
|
||||
backends: [10.0.0.2]
|
||||
healthcheck:
|
||||
type: icmp
|
||||
interval: 1s
|
||||
timeout: 2s
|
||||
`,
|
||||
errSub: "probe-ipv4-src",
|
||||
},
|
||||
{
|
||||
name: "mixed backend families",
|
||||
yaml: `
|
||||
maglev:
|
||||
frontend:
|
||||
vips:
|
||||
v:
|
||||
address: 192.0.2.1
|
||||
backends: [10.0.0.2, 2001:db8::1]
|
||||
healthcheck:
|
||||
type: icmp
|
||||
interval: 1s
|
||||
timeout: 2s
|
||||
`,
|
||||
errSub: "address family",
|
||||
},
|
||||
{
|
||||
name: "port without protocol",
|
||||
yaml: validPortWithoutProtocol,
|
||||
|
||||
errSub: "port requires protocol",
|
||||
},
|
||||
{
|
||||
name: "protocol without port",
|
||||
yaml: `
|
||||
maglev:
|
||||
frontend:
|
||||
vips:
|
||||
v:
|
||||
address: 192.0.2.1
|
||||
protocol: tcp
|
||||
backends: [10.0.0.2]
|
||||
healthcheck:
|
||||
type: icmp
|
||||
interval: 1s
|
||||
timeout: 2s
|
||||
`,
|
||||
errSub: "requires port",
|
||||
},
|
||||
{
|
||||
name: "invalid healthcheck type",
|
||||
yaml: `
|
||||
maglev:
|
||||
frontend:
|
||||
vips:
|
||||
v:
|
||||
address: 192.0.2.1
|
||||
backends: [10.0.0.2]
|
||||
healthcheck:
|
||||
type: dns
|
||||
interval: 1s
|
||||
timeout: 2s
|
||||
`,
|
||||
errSub: "type must be",
|
||||
},
|
||||
{
|
||||
name: "http missing path",
|
||||
yaml: `
|
||||
maglev:
|
||||
frontend:
|
||||
vips:
|
||||
v:
|
||||
address: 192.0.2.1
|
||||
backends: [10.0.0.2]
|
||||
healthcheck:
|
||||
type: http
|
||||
interval: 1s
|
||||
timeout: 2s
|
||||
`,
|
||||
errSub: "params.path",
|
||||
},
|
||||
{
|
||||
name: "negative interval",
|
||||
yaml: `
|
||||
maglev:
|
||||
frontend:
|
||||
vips:
|
||||
v:
|
||||
address: 192.0.2.1
|
||||
backends: [10.0.0.2]
|
||||
healthcheck:
|
||||
type: icmp
|
||||
interval: -1s
|
||||
timeout: 2s
|
||||
`,
|
||||
errSub: "positive duration",
|
||||
},
|
||||
{
|
||||
name: "invalid fast-interval",
|
||||
yaml: `
|
||||
maglev:
|
||||
frontend:
|
||||
vips:
|
||||
v:
|
||||
address: 192.0.2.1
|
||||
backends: [10.0.0.2]
|
||||
healthcheck:
|
||||
type: icmp
|
||||
interval: 1s
|
||||
fast-interval: -1s
|
||||
timeout: 2s
|
||||
`,
|
||||
errSub: "positive duration",
|
||||
},
|
||||
{
|
||||
name: "fall zero becomes default",
|
||||
yaml: `
|
||||
maglev:
|
||||
frontend:
|
||||
vips:
|
||||
v:
|
||||
address: 192.0.2.1
|
||||
backends: [10.0.0.2]
|
||||
healthcheck:
|
||||
type: icmp
|
||||
interval: 1s
|
||||
timeout: 2s
|
||||
fall: 0
|
||||
`,
|
||||
// fall: 0 is treated as omitted → default 3; no error
|
||||
errSub: "",
|
||||
},
|
||||
{
|
||||
name: "empty backends",
|
||||
yaml: `
|
||||
maglev:
|
||||
frontend:
|
||||
vips:
|
||||
v:
|
||||
address: 192.0.2.1
|
||||
backends: []
|
||||
healthcheck:
|
||||
type: icmp
|
||||
interval: 1s
|
||||
timeout: 2s
|
||||
`,
|
||||
errSub: "backends must not be empty",
|
||||
},
|
||||
}
|
||||
|
||||
for _, tt := range tests {
|
||||
t.Run(tt.name, func(t *testing.T) {
|
||||
_, err := parse([]byte(tt.yaml))
|
||||
if tt.errSub == "" {
|
||||
if err != nil {
|
||||
t.Fatalf("expected no error, got: %v", err)
|
||||
}
|
||||
return
|
||||
}
|
||||
if err == nil {
|
||||
t.Fatalf("expected error containing %q, got nil", tt.errSub)
|
||||
}
|
||||
if !contains(err.Error(), tt.errSub) {
|
||||
t.Errorf("error %q does not contain %q", err.Error(), tt.errSub)
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
const validPortWithoutProtocol = `
|
||||
maglev:
|
||||
frontend:
|
||||
vips:
|
||||
v:
|
||||
address: 192.0.2.1
|
||||
port: 80
|
||||
backends: [10.0.0.2]
|
||||
healthcheck:
|
||||
type: icmp
|
||||
interval: 1s
|
||||
timeout: 2s
|
||||
`
|
||||
|
||||
func contains(s, sub string) bool {
|
||||
return len(s) >= len(sub) && (s == sub || len(sub) == 0 ||
|
||||
func() bool {
|
||||
for i := 0; i <= len(s)-len(sub); i++ {
|
||||
if s[i:i+len(sub)] == sub {
|
||||
return true
|
||||
}
|
||||
}
|
||||
return false
|
||||
}())
|
||||
}
|
||||
Reference in New Issue
Block a user