feat(provider): Add Eureka Provider

README.md

@@ -13,7 +13,7 @@
 
 
 Træfɪk is a modern HTTP reverse proxy and load balancer made to deploy microservices with ease.
-It supports several backends ([Docker](https://www.docker.com/), [Swarm](https://docs.docker.com/swarm), [Kubernetes](http://kubernetes.io), [Marathon](https://mesosphere.github.io/marathon/), [Mesos](https://github.com/apache/mesos), [Consul](https://www.consul.io/), [Etcd](https://coreos.com/etcd/), [Zookeeper](https://zookeeper.apache.org), [BoltDB](https://github.com/boltdb/bolt), Rest API, file...) to manage its configuration automatically and dynamically.
+It supports several backends ([Docker](https://www.docker.com/), [Swarm](https://docs.docker.com/swarm), [Kubernetes](http://kubernetes.io), [Marathon](https://mesosphere.github.io/marathon/), [Mesos](https://github.com/apache/mesos), [Consul](https://www.consul.io/), [Etcd](https://coreos.com/etcd/), [Zookeeper](https://zookeeper.apache.org), [BoltDB](https://github.com/boltdb/bolt), [Eureka](https://github.com/Netflix/eureka), Rest API, file...) to manage its configuration automatically and dynamically.
 
 ## Overview
 

configuration.go

@@ -48,6 +48,7 @@ type GlobalConfiguration struct {
 	Boltdb                    *provider.BoltDb        `description:"Enable Boltdb backend"`
 	Kubernetes                *provider.Kubernetes    `description:"Enable Kubernetes backend"`
 	Mesos                     *provider.Mesos         `description:"Enable Mesos backend"`
+	Eureka                    *provider.Eureka        `description:"Enable Eureka backend"`
 }
 
 // DefaultEntryPoints holds default entry points

docs/toml.md

@@ -1226,4 +1226,40 @@ prefix = "/traefik"
 # filename = "boltdb.tmpl"
 ```
 
+## Eureka backend
+
+Træfɪk can be configured to use Eureka as a backend configuration:
+
+
+```toml
+################################################################
+# Eureka configuration backend
+################################################################
+
+# Enable Eureka configuration backend
+#
+# Optional
+#
+[eureka]
+
+# Eureka server endpoint.
+# endpoint := "http://my.eureka.server/eureka"
+#
+# Required
+#
+endpoint = "http://my.eureka.server/eureka"
+
+# Override default configuration time between refresh
+#
+# Optional
+# default 30s
+delay = "1m"
+
+# Override default configuration template. For advanced users :)
+#
+# Optional
+#
+# filename = "eureka.tmpl"
+```
+
 Please refer to the [Key Value storage structure](/user-guide/kv-config/#key-value-storage-structure) section to get documentation on traefik KV structure.

glide.lock

@@ -1,8 +1,14 @@
-hash: 5a4ccfe1c0ee6b0c67a40ceb07a8510d61646e1551599331b626ccf1341f4048
+hash: aae2fd761966717bcc30d8c03590cc28df8af49b36cc1d87689512cdfb44475e
-updated: 2016-11-15T19:22:10.412299841Z
+updated: 2016-11-16T21:37:51.673291661+01:00
 imports:
 - name: github.com/abbot/go-http-auth
   version: cb4372376e1e00e9f6ab9ec142e029302c9e7140
+- name: github.com/ArthurHlt/go-eureka-client
+  version: ba361cd0f9f571b4e871421423d2f02f5689c3d2
+  subpackages:
+  - eureka
+- name: github.com/ArthurHlt/gominlog
+  version: 068c01ce147ad68fca25ef3fa29ae5395ae273ab
 - name: github.com/boltdb/bolt
   version: f4c032d907f61f08dba2d719c58f108a1abb8e81
 - name: github.com/BurntSushi/toml
@@ -14,9 +20,9 @@ imports:
 - name: github.com/cenk/backoff
   version: 8edc80b07f38c27352fb186d971c628a6c32552b
 - name: github.com/codahale/hdrhistogram
-  version: 9208b142303c12d8899bae836fd524ac9338b4fd
+  version: f8ad88b59a584afeee9d334eff879b104439117b
 - name: github.com/codegangsta/cli
-  version: bf4a526f48af7badd25d2cb02d587e1b01be3b50
+  version: 1efa31f08b9333f1bd4882d61f9d668a70cd902e
 - name: github.com/codegangsta/negroni
   version: 3f7ce7b928e14ff890b067e5bbbc80af73690a9c
 - name: github.com/containous/flaeg
@@ -26,13 +32,17 @@ imports:
 - name: github.com/containous/staert
   version: 92329254783dc01174f03302d51d7cf2c9ff84cf
 - name: github.com/coreos/etcd
-  version: c400d05d0aa73e21e431c16145e558d624098018
+  version: 1c9e0a0e33051fed6c05c141e6fcbfe5c7f2a899
   subpackages:
-  - Godeps/_workspace/src/github.com/ugorji/go/codec
-  - Godeps/_workspace/src/golang.org/x/net/context
   - client
   - pkg/pathutil
   - pkg/types
+- name: github.com/davecgh/go-spew
+  version: 6d212800a42e8ab5c146b8ace3490ee17e5225f9
+  subpackages:
+  - spew
+- name: github.com/daviddengcn/go-colortext
+  version: 3b18c8575a432453d41fdafb340099fff5bba2f7
 - name: github.com/docker/distribution
   version: 99cb7c0946d2f5a38015443e515dc916295064d7
   subpackages:
@@ -155,9 +165,9 @@ imports:
 - name: github.com/gambol99/go-marathon
   version: a558128c87724cd7430060ef5aedf39f83937f55
 - name: github.com/go-check/check
-  version: 11d3bc7aa68e238947792f30573146a3231fc0f1
+  version: 4f90aeace3a26ad7021961c297b22c42160c7b25
 - name: github.com/gogo/protobuf
-  version: 43ab7f0ec7b6d072e0368bd537ffefe74ed30198
+  version: 99cb9b23110011cc45571c901ecae6f6f5e65cd3
   subpackages:
   - proto
 - name: github.com/golang/glog
@@ -167,7 +177,7 @@ imports:
   subpackages:
   - query
 - name: github.com/gorilla/context
-  version: 14f550f51af52180c2eefed15e5fd18d63c0a64a
+  version: 08b5f424b9271eedf6f9f0ce86cb9396ed337a42
 - name: github.com/hashicorp/consul
   version: d8e2fb7dd594163e25a89bc52c1a4613f5c5bfb8
   subpackages:
@@ -175,7 +185,7 @@ imports:
 - name: github.com/hashicorp/go-cleanhttp
   version: ad28ea4487f05916463e2423a55166280e8254b5
 - name: github.com/hashicorp/serf
-  version: 598c54895cc5a7b1a24a398d635e8c0ea0959870
+  version: b03bf85930b2349eb04b97c8fac437495296e3e7
   subpackages:
   - coordinate
 - name: github.com/jarcoal/httpmock
@@ -227,11 +237,15 @@ imports:
 - name: github.com/ogier/pflag
   version: 45c278ab3607870051a2ea9040bb85fcb8557481
 - name: github.com/opencontainers/runc
-  version: ba1568de399395774ad84c2ace65937814c542ed
+  version: 02f8fa7863dd3f82909a73e2061897828460d52f
   subpackages:
   - libcontainer/user
 - name: github.com/parnurzeal/gorequest
   version: e30af16d4e485943aab0b0885ad6bdbb8c0d3dc7
+- name: github.com/pmezard/go-difflib
+  version: d8ed2627bdf02c080bf22230dbb337003b7aba2d
+  subpackages:
+  - difflib
 - name: github.com/ryanuber/go-glob
   version: 572520ed46dbddaed19ea3d9541bdd0494163693
 - name: github.com/samuel/go-zookeeper
@@ -247,7 +261,7 @@ imports:
 - name: github.com/stretchr/objx
   version: cbeaeb16a013161a98496fad62933b1d21786672
 - name: github.com/stretchr/testify
-  version: b8dc1cecf15bdaf1988d9e87aa7cd98d899a06d6
+  version: 976c720a22c8eb4eb6a0b4348ad85ad12491a506
   subpackages:
   - assert
   - mock
@@ -255,6 +269,10 @@ imports:
   version: 152b5d051953fdb6e45f14b6826962aadc032324
 - name: github.com/tv42/zbase32
   version: 03389da7e0bf9844767f82690f4d68fc097a1306
+- name: github.com/ugorji/go
+  version: b94837a2404ab90efe9289e77a70694c355739cb
+  subpackages:
+  - codec
 - name: github.com/unrolled/render
   version: 526faf80cd4b305bb8134abea8d20d5ced74faa6
 - name: github.com/vdemeester/docker-events
@@ -278,7 +296,7 @@ imports:
 - name: github.com/vulcand/route
   version: cb89d787ddbb1c5849a7ac9f79004c1fd12a4a32
 - name: github.com/vulcand/vulcand
-  version: 42492a3a85e294bdbdd1bcabb8c12769a81ea284
+  version: bed092e10989250b48bdb6aa3b0557b207f05c80
   subpackages:
   - conntracker
   - plugin
@@ -289,26 +307,26 @@ imports:
   subpackages:
   - acme
 - name: golang.org/x/crypto
-  version: 4ed45ec682102c643324fae5dff8dab085b6c300
+  version: d81fdb778bf2c40a91b24519d60cdc5767318829
   subpackages:
   - bcrypt
   - blowfish
   - ocsp
 - name: golang.org/x/net
-  version: 6460565bec1e8891e29ff478184c71b9e443ac36
+  version: b400c2eff1badec7022a8c8f5bea058b6315eed7
   subpackages:
   - context
   - proxy
   - publicsuffix
 - name: golang.org/x/sys
-  version: eb2c74142fd19a79b3f237334c7384d5167b1b46
+  version: 62bee037599929a6e9146f29d10dd5208c43507d
   subpackages:
   - unix
   - windows
 - name: gopkg.in/fsnotify.v1
   version: 944cff21b3baf3ced9a880365682152ba577d348
 - name: gopkg.in/mgo.v2
-  version: 29cc868a5ca65f401ff318143f9408d02f4799cc
+  version: 22287bab4379e1fbf6002fb4eb769888f3fb224c
   subpackages:
   - bson
 - name: gopkg.in/square/go-jose.v1
@@ -326,7 +344,7 @@ testImports:
 - name: github.com/flynn/go-shlex
   version: 3f9db97f856818214da2e1057f8ad84803971cff
 - name: github.com/gorilla/mux
-  version: e444e69cbd2e2e3e0749a2f3c717cec491552bbf
+  version: 9fa818a44c2bf1396a17f9d5a3c0f6dd39d2ff8e
 - name: github.com/libkermit/docker-check
   version: cbe0ef03b3d23070eac4d00ba8828f2cc7f7e5a3
 - name: github.com/spf13/pflag

glide.yaml

@@ -99,3 +99,6 @@ import:
 - package: github.com/docker/leadership
 - package: github.com/satori/go.uuid
   version: ^1.1.0
+- package: github.com/ArthurHlt/go-eureka-client
+  subpackages:
+  - eureka

provider/eureka.go

@@ -0,0 +1,145 @@
+package provider
+
+import (
+	"github.com/ArthurHlt/go-eureka-client/eureka"
+	log "github.com/Sirupsen/logrus"
+	"github.com/cenk/backoff"
+	"github.com/containous/traefik/job"
+	"github.com/containous/traefik/safe"
+	"github.com/containous/traefik/types"
+	"io/ioutil"
+	"strconv"
+	"strings"
+	"text/template"
+	"time"
+)
+
+// Eureka holds configuration of the Eureka provider.
+type Eureka struct {
+	BaseProvider `mapstructure:",squash"`
+	Endpoint     string
+	Delay        string
+}
+
+// Provide allows the provider to provide configurations to traefik
+// using the given configuration channel.
+func (provider *Eureka) Provide(configurationChan chan<- types.ConfigMessage, pool *safe.Pool, _ []types.Constraint) error {
+
+	operation := func() error {
+		configuration, err := provider.buildConfiguration()
+		if err != nil {
+			log.Errorf("Failed to build configuration for Eureka, error: %s", err)
+			return err
+		}
+
+		configurationChan <- types.ConfigMessage{
+			ProviderName:  "eureka",
+			Configuration: configuration,
+		}
+
+		var delay time.Duration
+		if len(provider.Delay) > 0 {
+			var err error
+			delay, err = time.ParseDuration(provider.Delay)
+			if err != nil {
+				log.Errorf("Failed to parse delay for Eureka, error: %s", err)
+				return err
+			}
+		} else {
+			delay = time.Second * 30
+		}
+
+		ticker := time.NewTicker(delay)
+		go func() {
+			for t := range ticker.C {
+
+				log.Debug("Refreshing Eureka " + t.String())
+
+				configuration, err := provider.buildConfiguration()
+				if err != nil {
+					log.Errorf("Failed to refresh Eureka configuration, error: %s", err)
+					return
+				}
+
+				configurationChan <- types.ConfigMessage{
+					ProviderName:  "eureka",
+					Configuration: configuration,
+				}
+			}
+		}()
+		return nil
+	}
+
+	notify := func(err error, time time.Duration) {
+		log.Errorf("Eureka connection error %+v, retrying in %s", err, time)
+	}
+	err := backoff.RetryNotify(operation, job.NewBackOff(backoff.NewExponentialBackOff()), notify)
+	if err != nil {
+		log.Errorf("Cannot connect to Eureka server %+v", err)
+		return err
+	}
+	return nil
+}
+
+// Build the configuration from Eureka server
+func (provider *Eureka) buildConfiguration() (*types.Configuration, error) {
+	var EurekaFuncMap = template.FuncMap{
+		"replace":       replace,
+		"tolower":       strings.ToLower,
+		"getPort":       provider.getPort,
+		"getProtocol":   provider.getProtocol,
+		"getWeight":     provider.getWeight,
+		"getInstanceID": provider.getInstanceID,
+	}
+
+	eureka.GetLogger().SetOutput(ioutil.Discard)
+
+	client := eureka.NewClient([]string{
+		provider.Endpoint,
+	})
+
+	applications, err := client.GetApplications()
+	if err != nil {
+		return nil, err
+	}
+
+	templateObjects := struct {
+		Applications []eureka.Application
+	}{
+		applications.Applications,
+	}
+
+	configuration, err := provider.getConfiguration("templates/eureka.tmpl", EurekaFuncMap, templateObjects)
+	if err != nil {
+		log.Error(err)
+	}
+	return configuration, nil
+}
+
+func (provider *Eureka) getPort(instance eureka.InstanceInfo) string {
+	if instance.SecurePort.Enabled {
+		return strconv.Itoa(instance.SecurePort.Port)
+	}
+	return strconv.Itoa(instance.Port.Port)
+}
+
+func (provider *Eureka) getProtocol(instance eureka.InstanceInfo) string {
+	if instance.SecurePort.Enabled {
+		return "https"
+	}
+	return "http"
+}
+
+func (provider *Eureka) getWeight(instance eureka.InstanceInfo) string {
+	if val, ok := instance.Metadata.Map["traefik.weight"]; ok {
+		return val
+	}
+	return "0"
+}
+
+func (provider *Eureka) getInstanceID(instance eureka.InstanceInfo) string {
+	if val, ok := instance.Metadata.Map["traefik.backend.id"]; ok {
+		return val
+	}
+	return strings.Replace(instance.IpAddr, ".", "-", -1) + "-" + provider.getPort(instance)
+}

provider/eureka_test.go

@@ -0,0 +1,170 @@
+package provider
+
+import (
+	"github.com/ArthurHlt/go-eureka-client/eureka"
+	"testing"
+)
+
+func TestEurekaGetPort(t *testing.T) {
+	cases := []struct {
+		expectedPort string
+		instanceInfo eureka.InstanceInfo
+	}{
+		{
+			expectedPort: "80",
+			instanceInfo: eureka.InstanceInfo{
+				SecurePort: &eureka.Port{
+					Port: 443, Enabled: false,
+				},
+				Port: &eureka.Port{
+					Port: 80, Enabled: true,
+				},
+			},
+		},
+		{
+			expectedPort: "443",
+			instanceInfo: eureka.InstanceInfo{
+				SecurePort: &eureka.Port{
+					Port: 443, Enabled: true,
+				},
+				Port: &eureka.Port{
+					Port: 80, Enabled: false,
+				},
+			},
+		},
+	}
+
+	eurekaProvider := &Eureka{}
+	for _, c := range cases {
+		port := eurekaProvider.getPort(c.instanceInfo)
+		if port != c.expectedPort {
+			t.Fatalf("Should have been %s, got %s", c.expectedPort, port)
+		}
+	}
+}
+
+func TestEurekaGetProtocol(t *testing.T) {
+	cases := []struct {
+		expectedProtocol string
+		instanceInfo     eureka.InstanceInfo
+	}{
+		{
+			expectedProtocol: "http",
+			instanceInfo: eureka.InstanceInfo{
+				SecurePort: &eureka.Port{
+					Port: 443, Enabled: false,
+				},
+				Port: &eureka.Port{
+					Port: 80, Enabled: true,
+				},
+			},
+		},
+		{
+			expectedProtocol: "https",
+			instanceInfo: eureka.InstanceInfo{
+				SecurePort: &eureka.Port{
+					Port: 443, Enabled: true,
+				},
+				Port: &eureka.Port{
+					Port: 80, Enabled: false,
+				},
+			},
+		},
+	}
+
+	eurekaProvider := &Eureka{}
+	for _, c := range cases {
+		protocol := eurekaProvider.getProtocol(c.instanceInfo)
+		if protocol != c.expectedProtocol {
+			t.Fatalf("Should have been %s, got %s", c.expectedProtocol, protocol)
+		}
+	}
+}
+
+func TestEurekaGetWeight(t *testing.T) {
+	cases := []struct {
+		expectedWeight string
+		instanceInfo   eureka.InstanceInfo
+	}{
+		{
+			expectedWeight: "0",
+			instanceInfo: eureka.InstanceInfo{
+				Port: &eureka.Port{
+					Port: 80, Enabled: true,
+				},
+				Metadata: &eureka.MetaData{
+					Map: map[string]string{},
+				},
+			},
+		},
+		{
+			expectedWeight: "10",
+			instanceInfo: eureka.InstanceInfo{
+				Port: &eureka.Port{
+					Port: 80, Enabled: true,
+				},
+				Metadata: &eureka.MetaData{
+					Map: map[string]string{
+						"traefik.weight": "10",
+					},
+				},
+			},
+		},
+	}
+
+	eurekaProvider := &Eureka{}
+	for _, c := range cases {
+		weight := eurekaProvider.getWeight(c.instanceInfo)
+		if weight != c.expectedWeight {
+			t.Fatalf("Should have been %s, got %s", c.expectedWeight, weight)
+		}
+	}
+}
+
+func TestEurekaGetInstanceId(t *testing.T) {
+	cases := []struct {
+		expectedID   string
+		instanceInfo eureka.InstanceInfo
+	}{
+		{
+			expectedID: "MyInstanceId",
+			instanceInfo: eureka.InstanceInfo{
+				IpAddr: "10.11.12.13",
+				SecurePort: &eureka.Port{
+					Port: 443, Enabled: false,
+				},
+				Port: &eureka.Port{
+					Port: 80, Enabled: true,
+				},
+				Metadata: &eureka.MetaData{
+					Map: map[string]string{
+						"traefik.backend.id": "MyInstanceId",
+					},
+				},
+			},
+		},
+		{
+			expectedID: "10-11-12-13-80",
+			instanceInfo: eureka.InstanceInfo{
+				IpAddr: "10.11.12.13",
+				SecurePort: &eureka.Port{
+					Port: 443, Enabled: false,
+				},
+				Port: &eureka.Port{
+					Port: 80, Enabled: true,
+				},
+				Metadata: &eureka.MetaData{
+					Map: map[string]string{},
+				},
+			},
+		},
+	}
+
+	eurekaProvider := &Eureka{}
+	for _, c := range cases {
+		id := eurekaProvider.getInstanceID(c.instanceInfo)
+		if id != c.expectedID {
+			t.Fatalf("Should have been %s, got %s", c.expectedID, id)
+		}
+	}
+}

server.go

@@ -349,6 +349,9 @@ func (server *Server) configureProviders() {
 	if server.globalConfiguration.Mesos != nil {
 		server.providers = append(server.providers, server.globalConfiguration.Mesos)
 	}
+	if server.globalConfiguration.Eureka != nil {
+		server.providers = append(server.providers, server.globalConfiguration.Eureka)
+	}
 }
 
 func (server *Server) startProviders() {

templates/eureka.tmpl

@@ -0,0 +1,15 @@
+[backends]{{range .Applications}}
+    {{ $app := .}}
+    {{range .Instances}}
+    [backends.backend{{$app.Name}}.servers.server-{{ getInstanceID . }}]
+    url = "{{ getProtocol . }}://{{ .IpAddr }}:{{ getPort . }}"
+    weight = {{ getWeight . }}
+{{end}}{{end}}
+
+[frontends]{{range .Applications}}
+  [frontends.frontend{{.Name}}]
+    backend = "backend{{.Name}}"
+    entryPoints = ["http"]
+    [frontends.frontend{{.Name }}.routes.route-host{{.Name}}]
+      rule = "Host:http://{{ .Name | tolower }}"
+{{end}}