traefik/pkg/server/service/service.go

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package service
import (
"context"
"fmt"
"net/http"
"net/http/httputil"
"net/url"
"time"
"github.com/containous/alice"
"github.com/containous/traefik/pkg/config/dynamic"
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"github.com/containous/traefik/pkg/healthcheck"
"github.com/containous/traefik/pkg/log"
"github.com/containous/traefik/pkg/middlewares/accesslog"
"github.com/containous/traefik/pkg/middlewares/emptybackendhandler"
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"github.com/containous/traefik/pkg/middlewares/pipelining"
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"github.com/containous/traefik/pkg/server/cookie"
"github.com/containous/traefik/pkg/server/internal"
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"github.com/vulcand/oxy/roundrobin"
)
const (
defaultHealthCheckInterval = 30 * time.Second
defaultHealthCheckTimeout = 5 * time.Second
)
// NewManager creates a new Manager
func NewManager(configs map[string]*dynamic.ServiceInfo, defaultRoundTripper http.RoundTripper) *Manager {
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return &Manager{
bufferPool: newBufferPool(),
defaultRoundTripper: defaultRoundTripper,
balancers: make(map[string][]healthcheck.BalancerHandler),
configs: configs,
}
}
// Manager The service manager
type Manager struct {
bufferPool httputil.BufferPool
defaultRoundTripper http.RoundTripper
balancers map[string][]healthcheck.BalancerHandler
configs map[string]*dynamic.ServiceInfo
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}
// BuildHTTP Creates a http.Handler for a service configuration.
func (m *Manager) BuildHTTP(rootCtx context.Context, serviceName string, responseModifier func(*http.Response) error) (http.Handler, error) {
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ctx := log.With(rootCtx, log.Str(log.ServiceName, serviceName))
serviceName = internal.GetQualifiedName(ctx, serviceName)
ctx = internal.AddProviderInContext(ctx, serviceName)
conf, ok := m.configs[serviceName]
if !ok {
return nil, fmt.Errorf("the service %q does not exist", serviceName)
}
// TODO Should handle multiple service types
// FIXME Check if the service is declared multiple times with different types
if conf.LoadBalancer == nil {
conf.Err = fmt.Errorf("the service %q doesn't have any load balancer", serviceName)
return nil, conf.Err
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}
lb, err := m.getLoadBalancerServiceHandler(ctx, serviceName, conf.LoadBalancer, responseModifier)
if err != nil {
conf.Err = err
return nil, err
}
return lb, nil
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}
func (m *Manager) getLoadBalancerServiceHandler(
ctx context.Context,
serviceName string,
service *dynamic.LoadBalancerService,
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responseModifier func(*http.Response) error,
) (http.Handler, error) {
fwd, err := buildProxy(service.PassHostHeader, service.ResponseForwarding, m.defaultRoundTripper, m.bufferPool, responseModifier)
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if err != nil {
return nil, err
}
alHandler := func(next http.Handler) (http.Handler, error) {
return accesslog.NewFieldHandler(next, accesslog.ServiceName, serviceName, accesslog.AddServiceFields), nil
}
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handler, err := alice.New().Append(alHandler).Then(pipelining.New(ctx, fwd, "pipelining"))
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if err != nil {
return nil, err
}
balancer, err := m.getLoadBalancer(ctx, serviceName, service, handler)
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if err != nil {
return nil, err
}
// TODO rename and checks
m.balancers[serviceName] = append(m.balancers[serviceName], balancer)
// Empty (backend with no servers)
return emptybackendhandler.New(balancer), nil
}
// LaunchHealthCheck Launches the health checks.
func (m *Manager) LaunchHealthCheck() {
backendConfigs := make(map[string]*healthcheck.BackendConfig)
for serviceName, balancers := range m.balancers {
ctx := log.With(context.Background(), log.Str(log.ServiceName, serviceName))
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// TODO aggregate
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balancer := balancers[0]
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// TODO Should all the services handle healthcheck? Handle different types
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service := m.configs[serviceName].LoadBalancer
// Health Check
var backendHealthCheck *healthcheck.BackendConfig
if hcOpts := buildHealthCheckOptions(ctx, balancer, serviceName, service.HealthCheck); hcOpts != nil {
log.FromContext(ctx).Debugf("Setting up healthcheck for service %s with %s", serviceName, *hcOpts)
hcOpts.Transport = m.defaultRoundTripper
backendHealthCheck = healthcheck.NewBackendConfig(*hcOpts, serviceName)
}
if backendHealthCheck != nil {
backendConfigs[serviceName] = backendHealthCheck
}
}
// FIXME metrics and context
healthcheck.GetHealthCheck().SetBackendsConfiguration(context.TODO(), backendConfigs)
}
func buildHealthCheckOptions(ctx context.Context, lb healthcheck.BalancerHandler, backend string, hc *dynamic.HealthCheck) *healthcheck.Options {
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if hc == nil || hc.Path == "" {
return nil
}
logger := log.FromContext(ctx)
interval := defaultHealthCheckInterval
if hc.Interval != "" {
intervalOverride, err := time.ParseDuration(hc.Interval)
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switch {
case err != nil:
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logger.Errorf("Illegal health check interval for '%s': %s", backend, err)
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case intervalOverride <= 0:
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logger.Errorf("Health check interval smaller than zero for service '%s'", backend)
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default:
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interval = intervalOverride
}
}
timeout := defaultHealthCheckTimeout
if hc.Timeout != "" {
timeoutOverride, err := time.ParseDuration(hc.Timeout)
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switch {
case err != nil:
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logger.Errorf("Illegal health check timeout for backend '%s': %s", backend, err)
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case timeoutOverride <= 0:
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logger.Errorf("Health check timeout smaller than zero for backend '%s', backend", backend)
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default:
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timeout = timeoutOverride
}
}
if timeout >= interval {
logger.Warnf("Health check timeout for backend '%s' should be lower than the health check interval. Interval set to timeout + 1 second (%s).", backend, interval)
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}
return &healthcheck.Options{
Scheme: hc.Scheme,
Path: hc.Path,
Port: hc.Port,
Interval: interval,
Timeout: timeout,
LB: lb,
Hostname: hc.Hostname,
Headers: hc.Headers,
}
}
func (m *Manager) getLoadBalancer(ctx context.Context, serviceName string, service *dynamic.LoadBalancerService, fwd http.Handler) (healthcheck.BalancerHandler, error) {
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logger := log.FromContext(ctx)
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logger.Debug("Creating load-balancer")
var options []roundrobin.LBOption
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var cookieName string
if stickiness := service.Stickiness; stickiness != nil {
cookieName = cookie.GetName(stickiness.CookieName, serviceName)
opts := roundrobin.CookieOptions{HTTPOnly: stickiness.HTTPOnlyCookie, Secure: stickiness.SecureCookie}
options = append(options, roundrobin.EnableStickySession(roundrobin.NewStickySessionWithOptions(cookieName, opts)))
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logger.Debugf("Sticky session cookie name: %v", cookieName)
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}
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lb, err := roundrobin.New(fwd, options...)
if err != nil {
return nil, err
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}
lbsu := healthcheck.NewLBStatusUpdater(lb, m.configs[serviceName])
if err := m.upsertServers(ctx, lbsu, service.Servers); err != nil {
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return nil, fmt.Errorf("error configuring load balancer for service %s: %v", serviceName, err)
}
return lb, nil
}
func (m *Manager) upsertServers(ctx context.Context, lb healthcheck.BalancerHandler, servers []dynamic.Server) error {
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logger := log.FromContext(ctx)
for name, srv := range servers {
u, err := url.Parse(srv.URL)
if err != nil {
return fmt.Errorf("error parsing server URL %s: %v", srv.URL, err)
}
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logger.WithField(log.ServerName, name).Debugf("Creating server %d %s", name, u)
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if err := lb.UpsertServer(u, roundrobin.Weight(1)); err != nil {
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return fmt.Errorf("error adding server %s to load balancer: %v", srv.URL, err)
}
// FIXME Handle Metrics
}
return nil
}