Add tls support

config/config.go

@@ -227,6 +227,13 @@ func resolveFilepaths(baseDir string, cfg *Config) {
 			kcfg.TLSConfig.CertFile = join(kcfg.TLSConfig.CertFile)
 			kcfg.TLSConfig.KeyFile = join(kcfg.TLSConfig.KeyFile)
 		}
+
+		for _, mcfg := range scfg.MarathonSDConfigs {
+			mcfg.TLSConfig.CAFile = join(mcfg.TLSConfig.CAFile)
+			mcfg.TLSConfig.CertFile = join(mcfg.TLSConfig.CertFile)
+			mcfg.TLSConfig.KeyFile = join(mcfg.TLSConfig.KeyFile)
+		}
+
 	}
 }
 
@@ -773,6 +780,7 @@ func (c *NerveSDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
 type MarathonSDConfig struct {
 	Servers         []string       `yaml:"servers,omitempty"`
 	RefreshInterval model.Duration `yaml:"refresh_interval,omitempty"`
+	TLSConfig       TLSConfig      `yaml:"tls_config,omitempty"`
 
 	// Catches all undefined fields and must be empty after parsing.
 	XXX map[string]interface{} `yaml:",inline"`

config/config_test.go

@@ -258,9 +258,13 @@ var expectedConf = &Config{
 			MarathonSDConfigs: []*MarathonSDConfig{
 				{
 					Servers: []string{
-						"http://marathon.example.com:8080",
+						"https://marathon.example.com:443",
 					},
 					RefreshInterval: model.Duration(30 * time.Second),
+					TLSConfig: TLSConfig{
+						CertFile: "testdata/valid_cert_file",
+						KeyFile:  "testdata/valid_key_file",
+					},
 				},
 			},
 		},

config/testdata/conf.good.yml

@@ -126,7 +126,11 @@ scrape_configs:
 - job_name: service-marathon
   marathon_sd_configs:
   - servers:
-    - 'http://marathon.example.com:8080'
+    - 'https://marathon.example.com:443'
+
+    tls_config:
+      cert_file: valid_cert_file
+      key_file: valid_key_file
 
 - job_name: service-ec2
   ec2_sd_configs:

retrieval/discovery/discovery.go

@@ -14,8 +14,6 @@
 package discovery
 
 import (
-	"time"
-
 	"github.com/prometheus/prometheus/config"
 	"github.com/prometheus/prometheus/retrieval/discovery/consul"
 	"github.com/prometheus/prometheus/retrieval/discovery/dns"
@@ -41,12 +39,8 @@ func NewKubernetesDiscovery(conf *config.KubernetesSDConfig) (*kubernetes.Discov
 }
 
 // NewMarathon creates a new Marathon based discovery.
-func NewMarathon(conf *config.MarathonSDConfig) *marathon.Discovery {
-	return &marathon.Discovery{
-		Servers:         conf.Servers,
-		RefreshInterval: time.Duration(conf.RefreshInterval),
-		Client:          marathon.FetchApps,
-	}
+func NewMarathon(conf *config.MarathonSDConfig) (*marathon.Discovery, error) {
+	return marathon.NewDiscovery(conf)
 }
 
 // NewDNS creates a new DNS based discovery.

retrieval/discovery/marathon/marathon.go

@@ -27,6 +27,7 @@ import (
 	"github.com/prometheus/common/log"
 	"github.com/prometheus/common/model"
 	"github.com/prometheus/prometheus/config"
+	"github.com/prometheus/prometheus/util/httputil"
 )
 
 const (
@@ -47,10 +48,32 @@ const appListPath string = "/v2/apps/?embed=apps.tasks"
 
 // Discovery provides service discovery based on a Marathon instance.
 type Discovery struct {
-	Servers         []string
-	RefreshInterval time.Duration
+	client          *http.Client
+	servers         []string
+	refreshInterval time.Duration
 	lastRefresh     map[string]*config.TargetGroup
-	Client          AppListClient
+	appsClient      AppListClient
+}
+
+// Initialize sets up the discovery for usage.
+func NewDiscovery(conf *config.MarathonSDConfig) (*Discovery, error) {
+	tls, err := httputil.NewTLSConfig(conf.TLSConfig)
+	if err != nil {
+		return nil, err
+	}
+
+	client := &http.Client{
+		Transport: &http.Transport{
+			TLSClientConfig: tls,
+		},
+	}
+
+	return &Discovery{
+		client:          client,
+		servers:         conf.Servers,
+		refreshInterval: time.Duration(conf.RefreshInterval),
+		appsClient:      fetchApps,
+	}, nil
 }
 
 // Run implements the TargetProvider interface.
@@ -61,7 +84,7 @@ func (md *Discovery) Run(ctx context.Context, ch chan<- []*config.TargetGroup) {
 		select {
 		case <-ctx.Done():
 			return
-		case <-time.After(md.RefreshInterval):
+		case <-time.After(md.refreshInterval):
 			err := md.updateServices(ctx, ch)
 			if err != nil {
 				log.Errorf("Error while updating services: %s", err)
@@ -105,8 +128,8 @@ func (md *Discovery) updateServices(ctx context.Context, ch chan<- []*config.Tar
 }
 
 func (md *Discovery) fetchTargetGroups() (map[string]*config.TargetGroup, error) {
-	url := RandomAppsURL(md.Servers)
-	apps, err := md.Client(url)
+	url := RandomAppsURL(md.servers)
+	apps, err := md.appsClient(md.client, url)
 	if err != nil {
 		return nil, err
 	}
@@ -147,11 +170,11 @@ type AppList struct {
 }
 
 // AppListClient defines a function that can be used to get an application list from marathon.
-type AppListClient func(url string) (*AppList, error)
+type AppListClient func(client *http.Client, url string) (*AppList, error)
 
-// FetchApps requests a list of applications from a marathon server.
-func FetchApps(url string) (*AppList, error) {
-	resp, err := http.Get(url)
+// fetchApps requests a list of applications from a marathon server.
+func fetchApps(client *http.Client, url string) (*AppList, error) {
+	resp, err := client.Get(url)
 	if err != nil {
 		return nil, err
 	}

retrieval/discovery/marathon/marathon_test.go

@@ -15,6 +15,7 @@ package marathon
 
 import (
 	"errors"
+	"net/http"
 	"testing"
 	"time"
 
@@ -27,13 +28,15 @@ import (
 var (
 	marathonValidLabel = map[string]string{"prometheus": "yes"}
 	testServers        = []string{"http://localhost:8080"}
+	conf               = config.MarathonSDConfig{Servers: testServers}
 )
 
 func testUpdateServices(client AppListClient, ch chan []*config.TargetGroup) error {
-	md := Discovery{
-		Servers: testServers,
-		Client:  client,
+	md, err := NewDiscovery(&conf)
+	if err != nil {
+		return err
 	}
+	md.appsClient = client
 	return md.updateServices(context.Background(), ch)
 }
 
@@ -41,7 +44,7 @@ func TestMarathonSDHandleError(t *testing.T) {
 	var (
 		errTesting = errors.New("testing failure")
 		ch         = make(chan []*config.TargetGroup, 1)
-		client     = func(url string) (*AppList, error) { return nil, errTesting }
+		client     = func(client *http.Client, url string) (*AppList, error) { return nil, errTesting }
 	)
 	if err := testUpdateServices(client, ch); err != errTesting {
 		t.Fatalf("Expected error: %s", err)
@@ -56,7 +59,7 @@ func TestMarathonSDHandleError(t *testing.T) {
 func TestMarathonSDEmptyList(t *testing.T) {
 	var (
 		ch     = make(chan []*config.TargetGroup, 1)
-		client = func(url string) (*AppList, error) { return &AppList{}, nil }
+		client = func(client *http.Client, url string) (*AppList, error) { return &AppList{}, nil }
 	)
 	if err := testUpdateServices(client, ch); err != nil {
 		t.Fatalf("Got error: %s", err)
@@ -95,7 +98,7 @@ func marathonTestAppList(labels map[string]string, runningTasks int) *AppList {
 func TestMarathonSDSendGroup(t *testing.T) {
 	var (
 		ch     = make(chan []*config.TargetGroup, 1)
-		client = func(url string) (*AppList, error) {
+		client = func(client *http.Client, url string) (*AppList, error) {
 			return marathonTestAppList(marathonValidLabel, 1), nil
 		}
 	)
@@ -122,16 +125,14 @@ func TestMarathonSDSendGroup(t *testing.T) {
 }
 
 func TestMarathonSDRemoveApp(t *testing.T) {
-	var (
-		ch     = make(chan []*config.TargetGroup)
-		client = func(url string) (*AppList, error) {
-			return marathonTestAppList(marathonValidLabel, 1), nil
-		}
-		md = Discovery{
-			Servers: testServers,
-			Client:  client,
-		}
-	)
+	var ch = make(chan []*config.TargetGroup)
+	md, err := NewDiscovery(&conf)
+	if err != nil {
+		t.Fatalf("%s", err)
+	}
+	md.appsClient = func(client *http.Client, url string) (*AppList, error) {
+		return marathonTestAppList(marathonValidLabel, 1), nil
+	}
 	go func() {
 		up1 := (<-ch)[0]
 		up2 := (<-ch)[0]
@@ -142,32 +143,31 @@ func TestMarathonSDRemoveApp(t *testing.T) {
 			}
 		}
 	}()
-	err := md.updateServices(context.Background(), ch)
-	if err != nil {
+	if err := md.updateServices(context.Background(), ch); err != nil {
 		t.Fatalf("Got error on first update: %s", err)
 	}
 
-	md.Client = func(url string) (*AppList, error) {
+	md.appsClient = func(client *http.Client, url string) (*AppList, error) {
 		return marathonTestAppList(marathonValidLabel, 0), nil
 	}
-	err = md.updateServices(context.Background(), ch)
-	if err != nil {
+	if err := md.updateServices(context.Background(), ch); err != nil {
 		t.Fatalf("Got error on second update: %s", err)
 	}
 }
 
 func TestMarathonSDRunAndStop(t *testing.T) {
 	var (
-		ch     = make(chan []*config.TargetGroup)
-		client = func(url string) (*AppList, error) {
-			return marathonTestAppList(marathonValidLabel, 1), nil
-		}
-		md = Discovery{
-			Servers:         testServers,
-			Client:          client,
-			RefreshInterval: time.Millisecond * 10,
-		}
+		refreshInterval = model.Duration(time.Millisecond * 10)
+		conf            = config.MarathonSDConfig{Servers: testServers, RefreshInterval: refreshInterval}
+		ch              = make(chan []*config.TargetGroup)
 	)
+	md, err := NewDiscovery(&conf)
+	if err != nil {
+		t.Fatalf("%s", err)
+	}
+	md.appsClient = func(client *http.Client, url string) (*AppList, error) {
+		return marathonTestAppList(marathonValidLabel, 1), nil
+	}
 	ctx, cancel := context.WithCancel(context.Background())
 
 	go func() {
@@ -178,7 +178,7 @@ func TestMarathonSDRunAndStop(t *testing.T) {
 					return
 				}
 				cancel()
-			case <-time.After(md.RefreshInterval * 3):
+			case <-time.After(md.refreshInterval * 3):
 				cancel()
 				t.Fatalf("Update took too long.")
 			}
@@ -213,7 +213,7 @@ func marathonTestZeroTaskPortAppList(labels map[string]string, runningTasks int)
 func TestMarathonZeroTaskPorts(t *testing.T) {
 	var (
 		ch     = make(chan []*config.TargetGroup, 1)
-		client = func(url string) (*AppList, error) {
+		client = func(client *http.Client, url string) (*AppList, error) {
 			return marathonTestZeroTaskPortAppList(marathonValidLabel, 1), nil
 		}
 	)

retrieval/targetmanager.go

@@ -389,7 +389,12 @@ func providersFromConfig(cfg *config.ScrapeConfig) map[string]TargetProvider {
 		app("consul", i, k)
 	}
 	for i, c := range cfg.MarathonSDConfigs {
-		app("marathon", i, discovery.NewMarathon(c))
+		m, err := discovery.NewMarathon(c)
+		if err != nil {
+			log.Errorf("Cannot create Marathon discovery: %s", err)
+			continue
+		}
+		app("marathon", i, m)
 	}
 	for i, c := range cfg.KubernetesSDConfigs {
 		k, err := discovery.NewKubernetesDiscovery(c)