2018-11-14 09:18:03 +00:00
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package service
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import (
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"context"
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2023-11-29 11:20:57 +00:00
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"encoding/hex"
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2024-08-30 08:36:06 +00:00
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"encoding/json"
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2019-08-26 08:30:05 +00:00
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"errors"
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2018-11-14 09:18:03 +00:00
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"fmt"
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2022-11-16 10:38:07 +00:00
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"hash/fnv"
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2022-09-14 12:42:08 +00:00
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"math/rand"
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2018-11-14 09:18:03 +00:00
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"net/http"
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"net/url"
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2019-08-26 17:00:04 +00:00
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"reflect"
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2022-11-16 10:38:07 +00:00
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"strings"
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2018-11-14 09:18:03 +00:00
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"time"
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2024-01-08 08:10:06 +00:00
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"github.com/containous/alice"
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2022-11-21 17:36:05 +00:00
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"github.com/rs/zerolog/log"
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2023-02-03 14:24:05 +00:00
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"github.com/traefik/traefik/v3/pkg/config/dynamic"
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"github.com/traefik/traefik/v3/pkg/config/runtime"
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"github.com/traefik/traefik/v3/pkg/healthcheck"
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"github.com/traefik/traefik/v3/pkg/logs"
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"github.com/traefik/traefik/v3/pkg/middlewares/accesslog"
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2024-09-03 08:30:08 +00:00
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"github.com/traefik/traefik/v3/pkg/middlewares/capture"
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2023-02-03 14:24:05 +00:00
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metricsMiddle "github.com/traefik/traefik/v3/pkg/middlewares/metrics"
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2024-03-12 08:48:04 +00:00
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"github.com/traefik/traefik/v3/pkg/middlewares/observability"
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2024-09-26 09:00:05 +00:00
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"github.com/traefik/traefik/v3/pkg/proxy/httputil"
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2023-02-03 14:24:05 +00:00
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"github.com/traefik/traefik/v3/pkg/safe"
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"github.com/traefik/traefik/v3/pkg/server/cookie"
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2024-01-30 15:28:05 +00:00
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"github.com/traefik/traefik/v3/pkg/server/middleware"
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2023-02-03 14:24:05 +00:00
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"github.com/traefik/traefik/v3/pkg/server/provider"
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"github.com/traefik/traefik/v3/pkg/server/service/loadbalancer/failover"
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"github.com/traefik/traefik/v3/pkg/server/service/loadbalancer/mirror"
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"github.com/traefik/traefik/v3/pkg/server/service/loadbalancer/wrr"
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2024-08-30 08:36:06 +00:00
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"google.golang.org/grpc/status"
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2018-11-14 09:18:03 +00:00
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)
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2024-09-02 14:36:06 +00:00
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const (
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defaultMirrorBody = true
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defaultMaxBodySize int64 = -1
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)
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2020-03-05 17:03:08 +00:00
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2024-09-26 09:00:05 +00:00
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// ProxyBuilder builds reverse proxy handlers.
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type ProxyBuilder interface {
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2024-10-17 07:12:04 +00:00
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Build(cfgName string, targetURL *url.URL, shouldObserve, passHostHeader, preservePath bool, flushInterval time.Duration) (http.Handler, error)
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2024-09-26 09:00:05 +00:00
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Update(configs map[string]*dynamic.ServersTransport)
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2020-09-11 13:40:03 +00:00
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}
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2022-11-16 10:38:07 +00:00
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// Manager The service manager.
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type Manager struct {
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2024-09-26 09:00:05 +00:00
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routinePool *safe.Pool
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observabilityMgr *middleware.ObservabilityMgr
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transportManager httputil.TransportManager
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proxyBuilder ProxyBuilder
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2022-11-16 10:38:07 +00:00
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services map[string]http.Handler
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configs map[string]*runtime.ServiceInfo
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healthCheckers map[string]*healthcheck.ServiceHealthChecker
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rand *rand.Rand // For the initial shuffling of load-balancers.
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}
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2020-05-11 10:06:07 +00:00
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// NewManager creates a new Manager.
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2024-09-26 09:00:05 +00:00
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func NewManager(configs map[string]*runtime.ServiceInfo, observabilityMgr *middleware.ObservabilityMgr, routinePool *safe.Pool, transportManager httputil.TransportManager, proxyBuilder ProxyBuilder) *Manager {
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2018-11-14 09:18:03 +00:00
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return &Manager{
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2024-09-26 09:00:05 +00:00
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routinePool: routinePool,
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observabilityMgr: observabilityMgr,
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transportManager: transportManager,
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proxyBuilder: proxyBuilder,
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services: make(map[string]http.Handler),
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configs: configs,
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healthCheckers: make(map[string]*healthcheck.ServiceHealthChecker),
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rand: rand.New(rand.NewSource(time.Now().UnixNano())),
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2018-11-14 09:18:03 +00:00
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}
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}
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2019-03-14 08:30:04 +00:00
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// BuildHTTP Creates a http.Handler for a service configuration.
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2020-09-01 16:16:04 +00:00
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func (m *Manager) BuildHTTP(rootCtx context.Context, serviceName string) (http.Handler, error) {
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2022-11-21 17:36:05 +00:00
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serviceName = provider.GetQualifiedName(rootCtx, serviceName)
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2018-11-14 09:18:03 +00:00
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2022-11-21 17:36:05 +00:00
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ctx := log.Ctx(rootCtx).With().Str(logs.ServiceName, serviceName).Logger().
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WithContext(provider.AddInContext(rootCtx, serviceName))
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2019-01-15 13:28:04 +00:00
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2022-11-16 10:38:07 +00:00
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handler, ok := m.services[serviceName]
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if ok {
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return handler, nil
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}
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2019-05-16 08:58:06 +00:00
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conf, ok := m.configs[serviceName]
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if !ok {
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return nil, fmt.Errorf("the service %q does not exist", serviceName)
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}
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2022-11-16 10:38:07 +00:00
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if conf.Status == runtime.StatusDisabled {
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return nil, errors.New(strings.Join(conf.Err, ", "))
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}
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2019-08-26 17:00:04 +00:00
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value := reflect.ValueOf(*conf.Service)
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var count int
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2024-02-19 14:44:03 +00:00
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for i := range value.NumField() {
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2019-08-26 17:00:04 +00:00
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if !value.Field(i).IsNil() {
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count++
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}
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}
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if count > 1 {
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2019-09-13 18:00:06 +00:00
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err := errors.New("cannot create service: multi-types service not supported, consider declaring two different pieces of service instead")
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conf.AddError(err, true)
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return nil, err
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2019-08-26 08:30:05 +00:00
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}
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var lb http.Handler
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switch {
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case conf.LoadBalancer != nil:
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var err error
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2022-11-16 10:38:07 +00:00
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lb, err = m.getLoadBalancerServiceHandler(ctx, serviceName, conf)
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2019-08-26 08:30:05 +00:00
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if err != nil {
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conf.AddError(err, true)
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return nil, err
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}
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case conf.Weighted != nil:
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var err error
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2020-09-01 16:16:04 +00:00
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lb, err = m.getWRRServiceHandler(ctx, serviceName, conf.Weighted)
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2019-08-26 08:30:05 +00:00
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if err != nil {
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conf.AddError(err, true)
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return nil, err
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}
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2019-08-26 17:00:04 +00:00
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case conf.Mirroring != nil:
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var err error
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2020-09-01 16:16:04 +00:00
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lb, err = m.getMirrorServiceHandler(ctx, conf.Mirroring)
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2019-08-26 17:00:04 +00:00
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if err != nil {
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conf.AddError(err, true)
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return nil, err
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}
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2022-03-17 11:02:09 +00:00
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case conf.Failover != nil:
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var err error
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lb, err = m.getFailoverServiceHandler(ctx, serviceName, conf.Failover)
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if err != nil {
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conf.AddError(err, true)
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return nil, err
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}
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2019-08-26 08:30:05 +00:00
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default:
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sErr := fmt.Errorf("the service %q does not have any type defined", serviceName)
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2019-07-15 15:04:04 +00:00
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conf.AddError(sErr, true)
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return nil, sErr
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2018-11-14 09:18:03 +00:00
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}
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2019-05-16 08:58:06 +00:00
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2022-11-16 10:38:07 +00:00
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m.services[serviceName] = lb
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2019-08-26 08:30:05 +00:00
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return lb, nil
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}
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2022-03-17 11:02:09 +00:00
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func (m *Manager) getFailoverServiceHandler(ctx context.Context, serviceName string, config *dynamic.Failover) (http.Handler, error) {
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f := failover.New(config.HealthCheck)
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serviceHandler, err := m.BuildHTTP(ctx, config.Service)
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if err != nil {
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return nil, err
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}
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f.SetHandler(serviceHandler)
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updater, ok := serviceHandler.(healthcheck.StatusUpdater)
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if !ok {
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return nil, fmt.Errorf("child service %v of %v not a healthcheck.StatusUpdater (%T)", config.Service, serviceName, serviceHandler)
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}
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if err := updater.RegisterStatusUpdater(func(up bool) {
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f.SetHandlerStatus(ctx, up)
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}); err != nil {
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return nil, fmt.Errorf("cannot register %v as updater for %v: %w", config.Service, serviceName, err)
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}
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fallbackHandler, err := m.BuildHTTP(ctx, config.Fallback)
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if err != nil {
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return nil, err
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}
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f.SetFallbackHandler(fallbackHandler)
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// Do not report the health of the fallback handler.
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if config.HealthCheck == nil {
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return f, nil
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}
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fallbackUpdater, ok := fallbackHandler.(healthcheck.StatusUpdater)
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if !ok {
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return nil, fmt.Errorf("child service %v of %v not a healthcheck.StatusUpdater (%T)", config.Fallback, serviceName, fallbackHandler)
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}
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if err := fallbackUpdater.RegisterStatusUpdater(func(up bool) {
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f.SetFallbackHandlerStatus(ctx, up)
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}); err != nil {
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return nil, fmt.Errorf("cannot register %v as updater for %v: %w", config.Fallback, serviceName, err)
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}
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return f, nil
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}
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2020-09-01 16:16:04 +00:00
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func (m *Manager) getMirrorServiceHandler(ctx context.Context, config *dynamic.Mirroring) (http.Handler, error) {
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serviceHandler, err := m.BuildHTTP(ctx, config.Service)
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2019-08-26 17:00:04 +00:00
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if err != nil {
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return nil, err
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}
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2024-09-02 14:36:06 +00:00
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mirrorBody := defaultMirrorBody
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if config.MirrorBody != nil {
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mirrorBody = *config.MirrorBody
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}
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2020-03-05 17:03:08 +00:00
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maxBodySize := defaultMaxBodySize
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if config.MaxBodySize != nil {
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maxBodySize = *config.MaxBodySize
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}
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2024-09-02 14:36:06 +00:00
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handler := mirror.New(serviceHandler, m.routinePool, mirrorBody, maxBodySize, config.HealthCheck)
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2019-08-26 17:00:04 +00:00
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for _, mirrorConfig := range config.Mirrors {
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2020-09-01 16:16:04 +00:00
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mirrorHandler, err := m.BuildHTTP(ctx, mirrorConfig.Name)
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2019-08-26 17:00:04 +00:00
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if err != nil {
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return nil, err
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}
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err = handler.AddMirror(mirrorHandler, mirrorConfig.Percent)
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if err != nil {
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return nil, err
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}
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}
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return handler, nil
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}
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2020-09-01 16:16:04 +00:00
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func (m *Manager) getWRRServiceHandler(ctx context.Context, serviceName string, config *dynamic.WeightedRoundRobin) (http.Handler, error) {
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2019-08-26 08:30:05 +00:00
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// TODO Handle accesslog and metrics with multiple service name
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if config.Sticky != nil && config.Sticky.Cookie != nil {
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config.Sticky.Cookie.Name = cookie.GetName(config.Sticky.Cookie.Name, serviceName)
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2019-05-16 08:58:06 +00:00
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}
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2022-11-16 10:38:07 +00:00
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balancer := wrr.New(config.Sticky, config.HealthCheck != nil)
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2022-09-14 12:42:08 +00:00
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for _, service := range shuffle(config.Services, m.rand) {
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2024-08-30 08:36:06 +00:00
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serviceHandler, err := m.getServiceHandler(ctx, service)
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2019-08-26 08:30:05 +00:00
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if err != nil {
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return nil, err
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}
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2022-11-16 10:38:07 +00:00
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balancer.Add(service.Name, serviceHandler, service.Weight)
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2022-03-17 11:02:09 +00:00
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2021-06-25 19:08:11 +00:00
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if config.HealthCheck == nil {
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continue
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}
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childName := service.Name
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updater, ok := serviceHandler.(healthcheck.StatusUpdater)
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if !ok {
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return nil, fmt.Errorf("child service %v of %v not a healthcheck.StatusUpdater (%T)", childName, serviceName, serviceHandler)
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}
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if err := updater.RegisterStatusUpdater(func(up bool) {
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balancer.SetStatus(ctx, childName, up)
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}); err != nil {
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return nil, fmt.Errorf("cannot register %v as updater for %v: %w", childName, serviceName, err)
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}
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2022-11-21 17:36:05 +00:00
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log.Ctx(ctx).Debug().Str("parent", serviceName).Str("child", childName).
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Msg("Child service will update parent on status change")
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2019-08-26 08:30:05 +00:00
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}
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2021-06-25 19:08:11 +00:00
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2019-08-26 08:30:05 +00:00
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return balancer, nil
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2018-11-14 09:18:03 +00:00
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}
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2024-08-30 08:36:06 +00:00
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func (m *Manager) getServiceHandler(ctx context.Context, service dynamic.WRRService) (http.Handler, error) {
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switch {
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case service.Status != nil:
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return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
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rw.WriteHeader(*service.Status)
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}), nil
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case service.GRPCStatus != nil:
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return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
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st := status.New(service.GRPCStatus.Code, service.GRPCStatus.Msg)
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body, err := json.Marshal(st.Proto())
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if err != nil {
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http.Error(rw, "Failed to marshal status to JSON", http.StatusInternalServerError)
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return
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}
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rw.Header().Set("Content-Type", "application/json")
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rw.WriteHeader(http.StatusOK)
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_, _ = rw.Write(body)
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}), nil
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default:
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return m.BuildHTTP(ctx, service.Name)
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}
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}
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2022-11-16 10:38:07 +00:00
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func (m *Manager) getLoadBalancerServiceHandler(ctx context.Context, serviceName string, info *runtime.ServiceInfo) (http.Handler, error) {
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service := info.LoadBalancer
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2019-09-30 16:12:04 +00:00
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2022-11-21 17:36:05 +00:00
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logger := log.Ctx(ctx)
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|
|
|
logger.Debug().Msg("Creating load-balancer")
|
2020-09-11 13:40:03 +00:00
|
|
|
|
2022-11-16 10:38:07 +00:00
|
|
|
// TODO: should we keep this config value as Go is now handling stream response correctly?
|
2024-09-26 09:00:05 +00:00
|
|
|
flushInterval := time.Duration(dynamic.DefaultFlushInterval)
|
2022-11-16 10:38:07 +00:00
|
|
|
if service.ResponseForwarding != nil {
|
2024-09-26 09:00:05 +00:00
|
|
|
flushInterval = time.Duration(service.ResponseForwarding.FlushInterval)
|
2020-09-11 13:40:03 +00:00
|
|
|
}
|
|
|
|
|
2022-11-16 10:38:07 +00:00
|
|
|
if len(service.ServersTransport) > 0 {
|
|
|
|
service.ServersTransport = provider.GetQualifiedName(ctx, service.ServersTransport)
|
2018-11-14 09:18:03 +00:00
|
|
|
}
|
|
|
|
|
2022-11-16 10:38:07 +00:00
|
|
|
if service.Sticky != nil && service.Sticky.Cookie != nil {
|
|
|
|
service.Sticky.Cookie.Name = cookie.GetName(service.Sticky.Cookie.Name, serviceName)
|
2019-07-18 19:36:05 +00:00
|
|
|
}
|
2018-11-14 09:18:03 +00:00
|
|
|
|
2022-11-16 10:38:07 +00:00
|
|
|
// We make sure that the PassHostHeader value is defined to avoid panics.
|
|
|
|
passHostHeader := dynamic.DefaultPassHostHeader
|
|
|
|
if service.PassHostHeader != nil {
|
|
|
|
passHostHeader = *service.PassHostHeader
|
2018-11-14 09:18:03 +00:00
|
|
|
}
|
|
|
|
|
2022-11-16 10:38:07 +00:00
|
|
|
lb := wrr.New(service.Sticky, service.HealthCheck != nil)
|
|
|
|
healthCheckTargets := make(map[string]*url.URL)
|
2018-11-14 09:18:03 +00:00
|
|
|
|
2022-11-16 10:38:07 +00:00
|
|
|
for _, server := range shuffle(service.Servers, m.rand) {
|
|
|
|
hasher := fnv.New64a()
|
|
|
|
_, _ = hasher.Write([]byte(server.URL)) // this will never return an error.
|
2018-11-14 09:18:03 +00:00
|
|
|
|
2023-11-29 11:20:57 +00:00
|
|
|
proxyName := hex.EncodeToString(hasher.Sum(nil))
|
2018-11-14 09:18:03 +00:00
|
|
|
|
2022-11-16 10:38:07 +00:00
|
|
|
target, err := url.Parse(server.URL)
|
|
|
|
if err != nil {
|
|
|
|
return nil, fmt.Errorf("error parsing server URL %s: %w", server.URL, err)
|
2018-11-14 09:18:03 +00:00
|
|
|
}
|
2020-02-26 16:28:04 +00:00
|
|
|
|
2022-11-21 17:36:05 +00:00
|
|
|
logger.Debug().Str(logs.ServerName, proxyName).Stringer("target", target).
|
|
|
|
Msg("Creating server")
|
2022-09-20 14:54:08 +00:00
|
|
|
|
2024-03-12 08:48:04 +00:00
|
|
|
qualifiedSvcName := provider.GetQualifiedName(ctx, serviceName)
|
|
|
|
|
2024-09-26 09:00:05 +00:00
|
|
|
shouldObserve := m.observabilityMgr.ShouldAddTracing(qualifiedSvcName) || m.observabilityMgr.ShouldAddMetrics(qualifiedSvcName)
|
2024-10-17 07:12:04 +00:00
|
|
|
proxy, err := m.proxyBuilder.Build(service.ServersTransport, target, shouldObserve, passHostHeader, server.PreservePath, flushInterval)
|
2024-09-26 09:00:05 +00:00
|
|
|
if err != nil {
|
|
|
|
return nil, fmt.Errorf("error building proxy for server URL %s: %w", server.URL, err)
|
2024-03-12 08:48:04 +00:00
|
|
|
}
|
|
|
|
|
2024-01-30 15:28:05 +00:00
|
|
|
// Prevents from enabling observability for internal resources.
|
2019-06-05 20:18:06 +00:00
|
|
|
|
2024-03-12 08:48:04 +00:00
|
|
|
if m.observabilityMgr.ShouldAddAccessLogs(qualifiedSvcName) {
|
2024-01-30 15:28:05 +00:00
|
|
|
proxy = accesslog.NewFieldHandler(proxy, accesslog.ServiceURL, target.String(), nil)
|
|
|
|
proxy = accesslog.NewFieldHandler(proxy, accesslog.ServiceAddr, target.Host, nil)
|
|
|
|
proxy = accesslog.NewFieldHandler(proxy, accesslog.ServiceName, serviceName, accesslog.AddServiceFields)
|
|
|
|
}
|
|
|
|
|
|
|
|
if m.observabilityMgr.MetricsRegistry() != nil && m.observabilityMgr.MetricsRegistry().IsSvcEnabled() &&
|
2024-03-12 08:48:04 +00:00
|
|
|
m.observabilityMgr.ShouldAddMetrics(qualifiedSvcName) {
|
2024-01-30 15:28:05 +00:00
|
|
|
metricsHandler := metricsMiddle.WrapServiceHandler(ctx, m.observabilityMgr.MetricsRegistry(), serviceName)
|
2024-01-08 08:10:06 +00:00
|
|
|
|
|
|
|
proxy, err = alice.New().
|
2024-03-12 08:48:04 +00:00
|
|
|
Append(observability.WrapMiddleware(ctx, metricsHandler)).
|
2024-01-08 08:10:06 +00:00
|
|
|
Then(proxy)
|
|
|
|
if err != nil {
|
|
|
|
return nil, fmt.Errorf("error wrapping metrics handler: %w", err)
|
|
|
|
}
|
2021-04-29 15:56:03 +00:00
|
|
|
}
|
|
|
|
|
2024-03-12 08:48:04 +00:00
|
|
|
if m.observabilityMgr.ShouldAddTracing(qualifiedSvcName) {
|
|
|
|
proxy = observability.NewService(ctx, serviceName, proxy)
|
2024-01-30 15:28:05 +00:00
|
|
|
}
|
2024-01-08 08:10:06 +00:00
|
|
|
|
2024-09-03 08:30:08 +00:00
|
|
|
if m.observabilityMgr.ShouldAddAccessLogs(qualifiedSvcName) || m.observabilityMgr.ShouldAddMetrics(qualifiedSvcName) {
|
|
|
|
// Some piece of middleware, like the ErrorPage, are relying on this serviceBuilder to get the handler for a given service,
|
|
|
|
// to re-target the request to it.
|
|
|
|
// Those pieces of middleware can be configured on routes that expose a Traefik internal service.
|
|
|
|
// In such a case, observability for internals being optional, the capture probe could be absent from context (no wrap via the entrypoint).
|
|
|
|
// But if the service targeted by this piece of middleware is not an internal one,
|
|
|
|
// and requires observability, we still want the capture probe to be present in the request context.
|
|
|
|
// Makes sure a capture probe is in the request context.
|
|
|
|
proxy, _ = capture.Wrap(proxy)
|
|
|
|
}
|
|
|
|
|
2024-01-26 00:44:05 +00:00
|
|
|
lb.Add(proxyName, proxy, server.Weight)
|
2020-03-23 10:24:05 +00:00
|
|
|
|
2022-11-16 10:38:07 +00:00
|
|
|
// servers are considered UP by default.
|
|
|
|
info.UpdateServerStatus(target.String(), runtime.StatusUp)
|
2018-11-14 09:18:03 +00:00
|
|
|
|
2022-11-16 10:38:07 +00:00
|
|
|
healthCheckTargets[proxyName] = target
|
2018-11-14 09:18:03 +00:00
|
|
|
}
|
|
|
|
|
2022-11-16 10:38:07 +00:00
|
|
|
if service.HealthCheck != nil {
|
2024-09-26 09:00:05 +00:00
|
|
|
roundTripper, err := m.transportManager.GetRoundTripper(service.ServersTransport)
|
|
|
|
if err != nil {
|
|
|
|
return nil, fmt.Errorf("getting RoundTripper: %w", err)
|
|
|
|
}
|
|
|
|
|
2022-11-16 10:38:07 +00:00
|
|
|
m.healthCheckers[serviceName] = healthcheck.NewServiceHealthChecker(
|
|
|
|
ctx,
|
2024-01-30 15:28:05 +00:00
|
|
|
m.observabilityMgr.MetricsRegistry(),
|
2022-11-16 10:38:07 +00:00
|
|
|
service.HealthCheck,
|
|
|
|
lb,
|
|
|
|
info,
|
|
|
|
roundTripper,
|
|
|
|
healthCheckTargets,
|
2024-07-29 09:52:05 +00:00
|
|
|
serviceName,
|
2022-11-16 10:38:07 +00:00
|
|
|
)
|
2018-11-14 09:18:03 +00:00
|
|
|
}
|
|
|
|
|
2022-11-16 10:38:07 +00:00
|
|
|
return lb, nil
|
2018-11-14 09:18:03 +00:00
|
|
|
}
|
2020-03-23 10:24:05 +00:00
|
|
|
|
2022-11-16 10:38:07 +00:00
|
|
|
// LaunchHealthCheck launches the health checks.
|
|
|
|
func (m *Manager) LaunchHealthCheck(ctx context.Context) {
|
|
|
|
for serviceName, hc := range m.healthCheckers {
|
2022-11-21 17:36:05 +00:00
|
|
|
logger := log.Ctx(ctx).With().Str(logs.ServiceName, serviceName).Logger()
|
|
|
|
go hc.Launch(logger.WithContext(ctx))
|
2020-03-23 10:24:05 +00:00
|
|
|
}
|
|
|
|
}
|
2022-09-14 12:42:08 +00:00
|
|
|
|
|
|
|
func shuffle[T any](values []T, r *rand.Rand) []T {
|
|
|
|
shuffled := make([]T, len(values))
|
|
|
|
copy(shuffled, values)
|
|
|
|
r.Shuffle(len(shuffled), func(i, j int) { shuffled[i], shuffled[j] = shuffled[j], shuffled[i] })
|
|
|
|
|
|
|
|
return shuffled
|
|
|
|
}
|