[Feature] Exporter - network mesh check

Makefile

@@ -391,7 +391,7 @@ init: tools update-generated $(BIN) vendor
 .PHONY: tools
 tools: update-vendor
 	@echo ">> Fetching golangci-lint linter"
-	@GOBIN=$(GOPATH)/bin go install github.com/golangci/golangci-lint/cmd/golangci-lint@v1.40.0
+	@go install github.com/golangci/golangci-lint/cmd/golangci-lint@v1.42.1
 	@echo ">> Fetching goimports"
 	@GOBIN=$(GOPATH)/bin go get golang.org/x/tools/cmd/goimports@0bb7e5c47b1a31f85d4f173edc878a8e049764a5
 	@echo ">> Fetching license check"

exporter.go

@@ -23,13 +23,15 @@
 package main
 
 import (
+	"context"
 	"io/ioutil"
 	"os"
 	"os/signal"
 	"syscall"
 	"time"
 
 	"github.com/arangodb/kube-arangodb/pkg/exporter"
+	"github.com/arangodb/kube-arangodb/pkg/util"
 
 	"github.com/rs/zerolog/log"
 	"github.com/spf13/cobra"
@@ -100,6 +102,21 @@ func cmdExporterCheckE() error {
 		return err
 	}
 
+	mon := exporter.NewMonitor(exporterInput.endpoint, func() (string, error) {
+		if exporterInput.jwtFile == "" {
+			return "", nil
+		}
+
+		data, err := ioutil.ReadFile(exporterInput.jwtFile)
+		if err != nil {
+			return "", err
+		}
+
+		return string(data), nil
+	}, false, 15*time.Second)
+
+	go mon.UpdateMonitorStatus(util.CreateSignalContext(context.Background()))
+
 	exporter := exporter.NewExporter(exporterInput.listenAddress, "/metrics", p)
 	if exporterInput.keyfile != "" {
 		if e, err := exporter.WithKeyfile(exporterInput.keyfile); err != nil {

pkg/apis/deployment/v1/license_spec.go

@@ -52,7 +52,7 @@ func (s LicenseSpec) Validate() error {
 }
 
 // SetDefaultsFrom fills all values not set in s with values from other
-func (s LicenseSpec) SetDefaultsFrom(other LicenseSpec) {
+func (s *LicenseSpec) SetDefaultsFrom(other LicenseSpec) {
 	if !s.HasSecretName() {
 		s.SecretName = util.NewStringOrNil(other.SecretName)
 	}

pkg/apis/deployment/v2alpha1/license_spec.go

@@ -52,7 +52,7 @@ func (s LicenseSpec) Validate() error {
 }
 
 // SetDefaultsFrom fills all values not set in s with values from other
-func (s LicenseSpec) SetDefaultsFrom(other LicenseSpec) {
+func (s *LicenseSpec) SetDefaultsFrom(other LicenseSpec) {
 	if !s.HasSecretName() {
 		s.SecretName = util.NewStringOrNil(other.SecretName)
 	}

pkg/deployment/resources/secrets.go

@@ -431,9 +431,11 @@ func AppendKeyfileToKeyfolder(ctx context.Context, cachedStatus inspectorInterfa
 
 var (
 	exporterTokenClaims = jg.MapClaims{
-		"iss":           "arangodb",
-		"server_id":     "exporter",
-		"allowed_paths": []interface{}{"/_admin/statistics", "/_admin/statistics-description", k8sutil.ArangoExporterInternalEndpoint, k8sutil.ArangoExporterInternalEndpointV2},
+		"iss":       "arangodb",
+		"server_id": "exporter",
+		"allowed_paths": []interface{}{"/_admin/statistics", "/_admin/statistics-description",
+			k8sutil.ArangoExporterInternalEndpoint, k8sutil.ArangoExporterInternalEndpointV2,
+			k8sutil.ArangoExporterStatusEndpoint, k8sutil.ArangoExporterClusterHealthEndpoint},
 	}
 )
 

pkg/exporter/monitor.go

@@ -0,0 +1,165 @@
+//
+// DISCLAIMER
+//
+// Copyright 2016-2021 ArangoDB GmbH, Cologne, Germany
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Copyright holder is ArangoDB GmbH, Cologne, Germany
+//
+// Author Jakub Wierzbowski
+//
+
+package exporter
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"net/url"
+	"os"
+	"path"
+	"strings"
+	"sync/atomic"
+	"time"
+
+	"github.com/arangodb/go-driver"
+	"github.com/arangodb/kube-arangodb/pkg/util/k8sutil"
+
+	"github.com/rs/zerolog/log"
+)
+
+const (
+	monitorMetricTemplate  = "arangodb_member_health{role=\"%s\",id=\"%s\"} %d \n"
+	successRefreshInterval = time.Second * 120
+	failRefreshInterval    = time.Second * 15
+)
+
+var currentMembersStatus atomic.Value
+
+func NewMonitor(arangodbEndpoint string, auth Authentication, sslVerify bool, timeout time.Duration) *monitor {
+	uri, err := setPath(arangodbEndpoint, k8sutil.ArangoExporterClusterHealthEndpoint)
+	if err != nil {
+		log.Error().Err(err).Msgf("Fatal")
+		os.Exit(1)
+	}
+
+	return &monitor{
+		factory:   newHttpClientFactory(arangodbEndpoint, auth, sslVerify, timeout),
+		healthURI: uri,
+	}
+}
+
+type monitor struct {
+	factory   httpClientFactory
+	healthURI *url.URL
+}
+
+// UpdateMonitorStatus load monitor metrics for current cluster into currentMembersStatus
+func (m monitor) UpdateMonitorStatus(ctx context.Context) {
+	for {
+		sleep := successRefreshInterval
+
+		health, err := m.GetClusterHealth()
+		if err != nil {
+			log.Error().Err(err).Msg("GetClusterHealth error")
+			sleep = failRefreshInterval
+		} else {
+			var output strings.Builder
+			for key, value := range health.Health {
+				entry, err := m.GetMemberStatus(key, value)
+				if err != nil {
+					log.Error().Err(err).Msg("GetMemberStatus error")
+					sleep = failRefreshInterval
+				}
+				output.WriteString(entry)
+			}
+			currentMembersStatus.Store(output.String())
+		}
+
+		select {
+		case <-ctx.Done():
+			return
+		case <-time.After(sleep):
+			continue
+		}
+	}
+}
+
+// GetClusterHealth returns current ArangoDeployment cluster health status
+func (m monitor) GetClusterHealth() (*driver.ClusterHealth, error) {
+	c, req, err := m.factory()
+	if err != nil {
+		return nil, err
+	}
+	req.URL = m.healthURI
+	resp, err := c.Do(req)
+	if err != nil {
+		return nil, err
+	}
+
+	defer resp.Body.Close()
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	var result driver.ClusterHealth
+	if err := json.Unmarshal(body, &result); err != nil {
+		return nil, err
+	}
+
+	return &result, err
+}
+
+// GetMemberStatus returns Prometheus monitor metric for specific member
+func (m monitor) GetMemberStatus(id driver.ServerID, member driver.ServerHealth) (string, error) {
+	result := fmt.Sprintf(monitorMetricTemplate, member.Role, id, 0)
+
+	c, req, err := m.factory()
+	if err != nil {
+		return result, err
+	}
+
+	req.URL, err = setPath(member.Endpoint, k8sutil.ArangoExporterStatusEndpoint)
+	if err != nil {
+		return result, err
+	}
+
+	resp, err := c.Do(req)
+	if err != nil {
+		return result, err
+	}
+
+	if resp.StatusCode != 200 {
+		defer resp.Body.Close()
+		body, err := ioutil.ReadAll(resp.Body)
+		if err != nil {
+			return result, err
+		}
+		return result, errors.New(string(body))
+	}
+	return fmt.Sprintf(monitorMetricTemplate, member.Role, id, 1), nil
+}
+
+func setPath(uri, uriPath string) (*url.URL, error) {
+	u, err := url.Parse(uri)
+	if err != nil {
+		return u, err
+	}
+	u.Path = path.Join(uriPath)
+	u.Scheme = "https"
+	return u, nil
+}

pkg/exporter/passthru.go

@@ -123,6 +123,12 @@ func (p passthru) ServeHTTP(resp http.ResponseWriter, req *http.Request) {
 	// Fix Header response
 	responseStr = strings.ReplaceAll(responseStr, "guage", "gauge")
 
+	// Attach monitor data
+	monitorData := currentMembersStatus.Load()
+	if monitorData != nil {
+		responseStr = responseStr + monitorData.(string)
+	}
+
 	resp.WriteHeader(data.StatusCode)
 	_, err = resp.Write([]byte(responseStr))
 	if err != nil {

pkg/storage/provisioner/service/provisioner.go

@@ -84,10 +84,10 @@ func (p *Provisioner) GetInfo(ctx context.Context, localPath string) (provisione
 	}
 
 	// Available is blocks available * fragment size
-	available := int64(statfs.Bavail) * statfs.Bsize
+	available := int64(statfs.Bavail) * statfs.Bsize // nolint:typecheck
 
 	// Capacity is total block count * fragment size
-	capacity := int64(statfs.Blocks) * statfs.Bsize
+	capacity := int64(statfs.Blocks) * statfs.Bsize // nolint:typecheck
 
 	log.Debug().
 		Str("node-name", p.NodeName).

pkg/util/k8sutil/constants.go

@@ -29,9 +29,11 @@ const (
 	ArangoSyncWorkerPort = 8729
 	ArangoExporterPort   = 9101
 
-	ArangoExporterInternalEndpoint   = "/_admin/metrics"
-	ArangoExporterInternalEndpointV2 = "/_admin/metrics/v2"
-	ArangoExporterDefaultEndpoint    = "/metrics"
+	ArangoExporterStatusEndpoint        = "/_api/version"
+	ArangoExporterClusterHealthEndpoint = "/_admin/cluster/health"
+	ArangoExporterInternalEndpoint      = "/_admin/metrics"
+	ArangoExporterInternalEndpointV2    = "/_admin/metrics/v2"
+	ArangoExporterDefaultEndpoint       = "/metrics"
 
 	// K8s constants
 	ClusterIPNone       = "None"

pkg/util/signal.go

@@ -0,0 +1,56 @@
+//
+// DISCLAIMER
+//
+// Copyright 2016-2021 ArangoDB GmbH, Cologne, Germany
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Copyright holder is ArangoDB GmbH, Cologne, Germany
+//
+// Author Jakub Wierzbowski
+//
+
+package util
+
+import (
+	"context"
+	"os"
+	"os/signal"
+	"syscall"
+)
+
+// CreateSignalContext creates and returns the context which is closed when one of the provided signal occurs.
+// If the provided list of signals is empty, then SIGINT and SIGTERM is used by default.
+func CreateSignalContext(ctx context.Context, signals ...os.Signal) context.Context {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	ctxSignal, cancelSignal := context.WithCancel(ctx)
+	sigChannel := make(chan os.Signal, 2)
+
+	if len(signals) > 0 {
+		signal.Notify(sigChannel, signals...)
+	} else {
+		signal.Notify(sigChannel, os.Interrupt, syscall.SIGTERM)
+	}
+
+	go func() {
+		// Wait until signal occurs.
+		<-sigChannel
+		close(sigChannel)
+		// Close the context which is used by the caller.
+		cancelSignal()
+	}()
+
+	return ctxSignal
+}