fix cachet api returning bad response code

- extendable backends
- better project structure
- better cli interface

.gitignore

@@ -1,3 +1,5 @@
 /config.yml
 /config.json
-examples/
+examples/
+vendor/
+cachet-monitor

LICENSE.txt

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2017 Castaway Labs LLC
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

api.go

@@ -1,79 +0,0 @@
-package cachet
-
-import (
-	"bytes"
-	"crypto/tls"
-	"encoding/json"
-	"errors"
-	"net/http"
-	"strconv"
-	"time"
-
-	"github.com/Sirupsen/logrus"
-)
-
-type CachetAPI struct {
-	URL      string `json:"url"`
-	Token    string `json:"token"`
-	Insecure bool   `json:"insecure"`
-}
-
-type CachetResponse struct {
-	Data json.RawMessage `json:"data"`
-}
-
-// TODO: test
-func (api CachetAPI) Ping() error {
-	resp, _, err := api.NewRequest("GET", "/ping", nil)
-	if err != nil {
-		return err
-	}
-
-	if resp.StatusCode != 200 {
-		return errors.New("API Responded with non-200 status code")
-	}
-
-	return nil
-}
-
-// SendMetric adds a data point to a cachet monitor
-func (api CachetAPI) SendMetric(id int, lag int64) {
-	logrus.Debugf("Sending lag metric ID:%d RTT %vms", id, lag)
-
-	jsonBytes, _ := json.Marshal(map[string]interface{}{
-		"value":     lag,
-		"timestamp": time.Now().Unix(),
-	})
-
-	resp, _, err := api.NewRequest("POST", "/metrics/"+strconv.Itoa(id)+"/points", jsonBytes)
-	if err != nil || resp.StatusCode != 200 {
-		logrus.Warnf("Could not log metric! ID: %d, err: %v", id, err)
-	}
-}
-
-// TODO: test
-// NewRequest wraps http.NewRequest
-func (api CachetAPI) NewRequest(requestType, url string, reqBody []byte) (*http.Response, CachetResponse, error) {
-	req, err := http.NewRequest(requestType, api.URL+url, bytes.NewBuffer(reqBody))
-
-	req.Header.Set("Content-Type", "application/json")
-	req.Header.Set("X-Cachet-Token", api.Token)
-
-	transport := http.DefaultTransport.(*http.Transport)
-	transport.TLSClientConfig = &tls.Config{InsecureSkipVerify: api.Insecure}
-	client := &http.Client{
-		Transport: transport,
-	}
-
-	res, err := client.Do(req)
-	if err != nil {
-		return nil, CachetResponse{}, err
-	}
-
-	var body struct {
-		Data json.RawMessage `json:"data"`
-	}
-	err = json.NewDecoder(res.Body).Decode(&body)
-
-	return res, body, err
-}

backends/cachet/backend.go

@@ -0,0 +1,304 @@
+package cachetbackend
+
+import (
+	"bytes"
+	"crypto/tls"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/castawaylabs/cachet-monitor/monitors"
+	"github.com/sirupsen/logrus"
+)
+
+const DefaultTimeFormat = "15:04:05 Jan 2 MST"
+
+type CachetBackend struct {
+	URL        string `json:"url" yaml:"url"`
+	Token      string `json:"token" yaml:"token"`
+	Insecure   bool   `json:"insecure" yaml:"insecure"`
+	DateFormat string `json:"date_format" yaml:"date_format"`
+}
+
+type CachetResponse struct {
+	Data json.RawMessage `json:"data"`
+}
+
+func (api CachetBackend) ValidateMonitor(mon *monitors.AbstractMonitor) []string {
+	errs := []string{}
+
+	params := mon.Params
+
+	componentID, componentIDOk := params["component_id"]
+	metricID, metricIDOk := params["metric_id"]
+	if !componentIDOk && !metricIDOk {
+		errs = append(errs, "component_id and metric_id is unset")
+	}
+
+	if _, ok := componentID.(int); !ok && componentIDOk {
+		errs = append(errs, "component_id not integer")
+	}
+	if _, ok := metricID.(int); !ok && metricIDOk {
+		errs = append(errs, "metric_id not integer")
+	}
+
+	return errs
+}
+
+func (api CachetBackend) Validate() []string {
+	errs := []string{}
+
+	if len(api.URL) == 0 {
+		errs = append(errs, "Cachet API URL invalid")
+	}
+	if len(api.Token) == 0 {
+		errs = append(errs, "Cachet API Token invalid")
+	}
+
+	if len(api.DateFormat) == 0 {
+		api.DateFormat = DefaultTimeFormat
+	}
+
+	return errs
+}
+
+// TODO: test
+func (api CachetBackend) Ping() error {
+	resp, _, err := api.NewRequest("GET", "/ping", nil)
+	if err != nil {
+		return err
+	}
+
+	if resp.StatusCode != 200 {
+		return errors.New("API Responded with non-200 status code")
+	}
+
+	defer resp.Body.Close()
+
+	return nil
+}
+
+// TODO: test
+// NewRequest wraps http.NewRequest
+func (api CachetBackend) NewRequest(requestType, url string, reqBody []byte) (*http.Response, interface{}, error) {
+	req, err := http.NewRequest(requestType, api.URL+url, bytes.NewBuffer(reqBody))
+
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("X-Cachet-Token", api.Token)
+
+	transport := http.DefaultTransport.(*http.Transport)
+	transport.TLSClientConfig = &tls.Config{InsecureSkipVerify: api.Insecure}
+	client := &http.Client{
+		Transport: transport,
+	}
+
+	res, err := client.Do(req)
+	if err != nil {
+		return nil, CachetResponse{}, err
+	}
+	defer res.Body.Close()
+	defer req.Body.Close()
+
+	var body CachetResponse
+	err = json.NewDecoder(res.Body).Decode(&body)
+
+	return res, body, err
+}
+
+func (mon CachetBackend) Describe() []string {
+	features := []string{"Cachet API"}
+
+	return features
+}
+
+func (api CachetBackend) SendMetric(monitor monitors.MonitorInterface, lag int64) error {
+	mon := monitor.GetMonitor()
+	if _, ok := mon.Params["metric_id"]; !ok {
+		return nil
+	}
+
+	metricID := mon.Params["metric_id"].(int)
+
+	// report lag
+	logrus.Debugf("Sending lag metric ID: %d RTT %vms", metricID, lag)
+
+	jsonBytes, _ := json.Marshal(map[string]interface{}{
+		"value":     lag,
+		"timestamp": time.Now().Unix(),
+	})
+
+	resp, _, err := api.NewRequest("POST", "/metrics/"+strconv.Itoa(metricID)+"/points", jsonBytes)
+	if err != nil || resp.StatusCode != 200 {
+		logrus.Warnf("Could not log metric! ID: %d, err: %v", metricID, err)
+	}
+
+	if resp != nil && resp.Body != nil {
+		defer resp.Body.Close()
+	}
+
+	return nil
+}
+
+func (api CachetBackend) UpdateMonitor(mon monitors.MonitorInterface, status, previousStatus monitors.MonitorStatus, errs []error) error {
+	monitor := mon.GetMonitor()
+	l := logrus.WithFields(logrus.Fields{
+		"monitor": monitor.Name,
+		"time":    time.Now().Format(api.DateFormat),
+	})
+
+	errors := make([]string, len(errs))
+	for i, err := range errs {
+		errors[i] = err.Error()
+	}
+
+	fmt.Println("errs", errs)
+
+	componentID := monitor.Params["component_id"].(int)
+	incident, err := api.findIncident(componentID)
+	if err != nil {
+		l.Errorf("Couldn't find existing incidents: %v", err)
+	}
+
+	if incident == nil {
+		// create a new one
+		incident = &Incident{
+			Name:        "",
+			ComponentID: componentID,
+			Message:     "",
+			Notify:      true,
+		}
+	} else {
+		// find component status
+		component, err := api.getComponent(incident.ComponentID)
+		if err != nil {
+			panic(err)
+		}
+
+		incident.ComponentStatus = component.Status
+	}
+
+	tpls := monitor.Template
+	tplData := api.getTemplateData(monitor)
+	var tpl monitors.MessageTemplate
+
+	if status == monitors.MonitorStatusDown {
+		tpl = tpls.Investigating
+		tplData["FailReason"] = strings.Join(errors, "\n - ")
+		l.Warnf("updating component. Monitor is down: %v", tplData["FailReason"])
+	} else {
+		// was down, created an incident, its now ok, make it resolved.
+		tpl = tpls.Fixed
+		l.Warn("Resolving incident")
+	}
+
+	tplData["incident"] = incident
+	subject, message := tpl.Exec(tplData)
+
+	if incident.ID == 0 {
+		incident.Name = subject
+		incident.Message = message
+	} else {
+		incident.Message += "\n\n---\n\n" + subject + ":\n\n" + message
+	}
+
+	if status == monitors.MonitorStatusDown && (incident.ComponentStatus == 0 || incident.ComponentStatus > 2) {
+		incident.Status = 1
+		fmt.Println("incident status", incident.ComponentStatus)
+		if incident.ComponentStatus >= 3 {
+			// major outage
+			incident.ComponentStatus = 4
+		} else {
+			incident.ComponentStatus = 3
+		}
+	} else if status == monitors.MonitorStatusUp {
+		incident.Status = 4
+		incident.ComponentStatus = 1
+	}
+	incident.Notify = true
+
+	// create/update incident
+	if err := incident.Send(api); err != nil {
+		l.Errorf("Error sending incident: %v", err)
+		return err
+	}
+
+	return nil
+}
+
+func (api CachetBackend) Tick(monitor monitors.MonitorInterface, status monitors.MonitorStatus, errs []error, lag int64) {
+	mon := monitor.GetMonitor()
+	if mon.GetLastStatus() == status || status == monitors.MonitorStatusNotSaturated {
+		return
+	}
+
+	logrus.Infof("updating backend for monitor")
+	lastStatus := mon.UpdateLastStatus(status)
+
+	api.UpdateMonitor(monitor, status, lastStatus, errs)
+
+	if _, ok := mon.Params["metric_id"]; ok && lag > 0 {
+		api.SendMetric(monitor, lag)
+	}
+}
+
+func (api CachetBackend) getComponent(componentID int) (*Component, error) {
+	resp, body, err := api.NewRequest("GET", "/components/"+strconv.Itoa(componentID), nil)
+	if err != nil {
+		return nil, err
+	}
+
+	var data *Component
+	if err := json.Unmarshal(body.(CachetResponse).Data, &data); err != nil {
+		return nil, fmt.Errorf("Cannot decode component: %v", err)
+	}
+
+	if resp.StatusCode != 200 {
+		return nil, fmt.Errorf("Could not get component! %v", err)
+	}
+
+	return data, nil
+}
+
+func (api CachetBackend) findIncident(componentID int) (*Incident, error) {
+	// fetch watching, identified & investigating
+	statuses := []int{3, 2, 1}
+	for _, status := range statuses {
+		incidents, err := api.findIncidents(componentID, status)
+		if err != nil {
+			return nil, err
+		}
+
+		for _, incident := range incidents {
+			incident.Status = status
+			return incident, nil
+		}
+	}
+
+	return nil, nil
+}
+
+func (api CachetBackend) findIncidents(componentID int, status int) ([]*Incident, error) {
+	resp, body, err := api.NewRequest("GET", "/incidents?component_Id="+strconv.Itoa(componentID)+"&status="+strconv.Itoa(status), nil)
+	if err != nil {
+		return nil, err
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("GET /incidents returned %d", resp.StatusCode)
+	}
+
+	var data []*Incident
+	if err := json.Unmarshal(body.(CachetResponse).Data, &data); err != nil {
+		return nil, fmt.Errorf("Cannot find incidents: %v", err)
+	}
+
+	if resp.StatusCode != 200 {
+		return nil, fmt.Errorf("Could not fetch incidents! %v", err)
+	}
+
+	return data, nil
+}

backends/cachet/component.go

@@ -0,0 +1,14 @@
+package cachetbackend
+
+// Incident Cachet data model
+type Component struct {
+	ID      int    `json:"id"`
+	Name    string `json:"name"`
+	Message string `json:"message"`
+	Status  int    `json:"status"`
+	Visible int    `json:"visible"`
+	Notify  bool   `json:"notify"`
+
+	ComponentID     int `json:"component_id"`
+	ComponentStatus int `json:"component_status"`
+}

backends/cachet/incident.go

@@ -0,0 +1,67 @@
+package cachetbackend
+
+import (
+	"encoding/json"
+	"fmt"
+	"strconv"
+	"time"
+
+	"github.com/castawaylabs/cachet-monitor/backends"
+	"github.com/castawaylabs/cachet-monitor/monitors"
+)
+
+// "github.com/sirupsen/logrus"
+
+// Incident Cachet data model
+type Incident struct {
+	ID      int    `json:"id"`
+	Name    string `json:"name"`
+	Message string `json:"message"`
+	Status  int    `json:"status"`
+	Visible int    `json:"visible"`
+	Notify  bool   `json:"notify"`
+
+	ComponentID     int `json:"component_id"`
+	ComponentStatus int `json:"component_status"`
+}
+
+// Send - Create or Update incident
+func (incident *Incident) Send(backend backends.BackendInterface) error {
+	requestURL := "/incidents"
+	requestMethod := "POST"
+	jsonBytes, _ := json.Marshal(incident)
+
+	if incident.ID > 0 {
+		// create an incident update
+		requestMethod = "PUT"
+		requestURL += "/" + strconv.Itoa(incident.ID)
+	}
+
+	resp, body, err := backend.NewRequest(requestMethod, requestURL, jsonBytes)
+	if err != nil {
+		return err
+	}
+
+	var data struct {
+		ID int `json:"id"`
+	}
+	if err := json.Unmarshal(body.(CachetResponse).Data, &data); err != nil {
+		return fmt.Errorf("Cannot parse incident body: %v, %v", err, string(body.(CachetResponse).Data))
+	}
+
+	incident.ID = data.ID
+	if resp.StatusCode != 200 {
+		return fmt.Errorf("Could not update/create incident!")
+	}
+
+	return nil
+}
+
+func (api *CachetBackend) getTemplateData(monitor *monitors.AbstractMonitor) map[string]interface{} {
+	return map[string]interface{}{
+		// "SystemName": monitor.config.SystemName,
+		"Monitor": monitor,
+		"now":     time.Now().Format(api.DateFormat),
+		// "incident":   monitor.incident,
+	}
+}

backends/interface.go

@@ -0,0 +1,19 @@
+package backends
+
+import (
+	"net/http"
+
+	"github.com/castawaylabs/cachet-monitor/monitors"
+)
+
+type BackendInterface interface {
+	Ping() error
+	Tick(monitor monitors.MonitorInterface, status monitors.MonitorStatus, errs []error, lag int64)
+	SendMetric(monitor monitors.MonitorInterface, lag int64) error
+	UpdateMonitor(monitor monitors.MonitorInterface, status, previousStatus monitors.MonitorStatus, errs []error) error
+	NewRequest(requestType, url string, reqBody []byte) (*http.Response, interface{}, error)
+
+	Describe() []string
+	Validate() []string
+	ValidateMonitor(monitor *monitors.AbstractMonitor) []string
+}

cli/main.go

@@ -1,196 +0,0 @@
-package main
-
-import (
-	"encoding/json"
-	"errors"
-	"io/ioutil"
-	"net/http"
-	"net/url"
-	"os"
-	"os/signal"
-	"strings"
-	"sync"
-
-	"github.com/Sirupsen/logrus"
-	cachet "github.com/castawaylabs/cachet-monitor"
-	docopt "github.com/docopt/docopt-go"
-	"github.com/mitchellh/mapstructure"
-	"gopkg.in/yaml.v2"
-)
-
-const usage = `cachet-monitor
-
-Usage:
-  cachet-monitor (-c PATH | --config PATH) [--log=LOGPATH] [--name=NAME] [--immediate]
-  cachet-monitor -h | --help | --version
-
-Arguments:
-  PATH     path to config.json
-  LOGPATH  path to log output (defaults to STDOUT)
-  NAME     name of this logger
-
-Examples:
-  cachet-monitor -c /root/cachet-monitor.json
-  cachet-monitor -c /root/cachet-monitor.json --log=/var/log/cachet-monitor.log --name="development machine"
-
-Options:
-  -c PATH.json --config PATH     Path to configuration file
-  -h --help                      Show this screen.
-  --version                      Show version
-  --immediate                    Tick immediately (by default waits for first defined interval)
-  
-Environment varaibles:
-  CACHET_API      override API url from configuration
-  CACHET_TOKEN    override API token from configuration
-  CACHET_DEV      set to enable dev logging`
-
-func main() {
-	arguments, _ := docopt.Parse(usage, nil, true, "cachet-monitor", false)
-
-	cfg, err := getConfiguration(arguments["--config"].(string))
-	if err != nil {
-		logrus.Panicf("Unable to start (reading config): %v", err)
-	}
-
-	if immediate, ok := arguments["--immediate"]; ok {
-		cfg.Immediate = immediate.(bool)
-	}
-
-	if name := arguments["--name"]; name != nil {
-		cfg.SystemName = name.(string)
-	}
-	logrus.SetOutput(getLogger(arguments["--log"]))
-
-	if len(os.Getenv("CACHET_API")) > 0 {
-		cfg.API.URL = os.Getenv("CACHET_API")
-	}
-	if len(os.Getenv("CACHET_TOKEN")) > 0 {
-		cfg.API.Token = os.Getenv("CACHET_TOKEN")
-	}
-	if len(os.Getenv("CACHET_DEV")) > 0 {
-		logrus.SetLevel(logrus.DebugLevel)
-	}
-
-	if valid := cfg.Validate(); !valid {
-		logrus.Errorf("Invalid configuration")
-		os.Exit(1)
-	}
-
-	logrus.Debug("Configuration valid")
-	logrus.Infof("System: %s", cfg.SystemName)
-	logrus.Infof("API: %s", cfg.API.URL)
-	logrus.Infof("Monitors: %d\n", len(cfg.Monitors))
-
-	logrus.Infof("Pinging cachet")
-	if err := cfg.API.Ping(); err != nil {
-		logrus.Errorf("Cannot ping cachet!\n%v", err)
-		os.Exit(1)
-	}
-	logrus.Infof("Ping OK")
-
-	wg := &sync.WaitGroup{}
-	for index, monitor := range cfg.Monitors {
-		logrus.Infof("Starting Monitor #%d: ", index)
-		logrus.Infof("Features: \n - %v", strings.Join(monitor.Describe(), "\n - "))
-
-		go monitor.ClockStart(cfg, monitor, wg)
-	}
-
-	signals := make(chan os.Signal, 1)
-	signal.Notify(signals, os.Interrupt, os.Kill)
-	<-signals
-
-	logrus.Warnf("Abort: Waiting monitors to finish")
-	for _, mon := range cfg.Monitors {
-		mon.GetMonitor().ClockStop()
-	}
-
-	wg.Wait()
-}
-
-func getLogger(logPath interface{}) *os.File {
-	if logPath == nil || len(logPath.(string)) == 0 {
-		return os.Stdout
-	}
-
-	file, err := os.Create(logPath.(string))
-	if err != nil {
-		logrus.Errorf("Unable to open file '%v' for logging: \n%v", logPath, err)
-		os.Exit(1)
-	}
-
-	return file
-}
-
-func getConfiguration(path string) (*cachet.CachetMonitor, error) {
-	var cfg cachet.CachetMonitor
-	var data []byte
-
-	// test if its a url
-	url, err := url.ParseRequestURI(path)
-	if err == nil && len(url.Scheme) > 0 {
-		// download config
-		response, err := http.Get(path)
-		if err != nil {
-			logrus.Warn("Unable to download network configuration")
-			return nil, err
-		}
-
-		defer response.Body.Close()
-		data, _ = ioutil.ReadAll(response.Body)
-
-		logrus.Info("Downloaded network configuration.")
-	} else {
-		data, err = ioutil.ReadFile(path)
-		if err != nil {
-			return nil, errors.New("Unable to open file: '" + path + "'")
-		}
-	}
-
-	if strings.HasSuffix(path, ".yaml") || strings.HasSuffix(path, ".yml") {
-		err = yaml.Unmarshal(data, &cfg)
-	} else {
-		err = json.Unmarshal(data, &cfg)
-	}
-
-	if err != nil {
-		logrus.Warnf("Unable to parse configuration file")
-	}
-
-	cfg.Monitors = make([]cachet.MonitorInterface, len(cfg.RawMonitors))
-	for index, rawMonitor := range cfg.RawMonitors {
-		var t cachet.MonitorInterface
-		var err error
-
-		// get default type
-		monType := cachet.GetMonitorType("")
-		if t, ok := rawMonitor["type"].(string); ok {
-			monType = cachet.GetMonitorType(t)
-		}
-
-		switch monType {
-		case "http":
-			var s cachet.HTTPMonitor
-			err = mapstructure.Decode(rawMonitor, &s)
-			t = &s
-		case "dns":
-			var s cachet.DNSMonitor
-			err = mapstructure.Decode(rawMonitor, &s)
-			t = &s
-		default:
-			logrus.Errorf("Invalid monitor type (index: %d) %v", index, monType)
-			continue
-		}
-
-		t.GetMonitor().Type = monType
-
-		if err != nil {
-			logrus.Errorf("Unable to unmarshal monitor to type (index: %d): %v", index, err)
-			continue
-		}
-
-		cfg.Monitors[index] = t
-	}
-
-	return &cfg, err
-}

cli/root.go

@@ -0,0 +1,115 @@
+package main
+
+import (
+	"os"
+	"os/signal"
+	"strings"
+	"sync"
+
+	cachet "github.com/castawaylabs/cachet-monitor"
+	"github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+)
+
+var cfgFile string
+
+// rootCmd represents the base command when called without any subcommands
+var rootCmd = &cobra.Command{
+	Use:   "cmd",
+	Short: "cachet-monitor",
+	// Uncomment the following line if your bare application
+	// has an action associated with it:
+	Run: func(cmd *cobra.Command, args []string) {
+		Action(cmd, args)
+	},
+}
+
+func main() {
+	if err := rootCmd.Execute(); err != nil {
+		panic(err)
+	}
+}
+
+func init() {
+	// Here you will define your flags and configuration settings.
+	// Cobra supports persistent flags, which, if defined here,
+	// will be global for your application.
+	pf := rootCmd.PersistentFlags()
+	pf.StringVarP(&cfgFile, "config", "c", "", "config file (default is $(pwd)/config.yml)")
+	pf.String("log", "", "log output")
+	pf.String("format", "text", "log format [text/json]")
+	pf.String("name", "", "machine name")
+	pf.Bool("immediate", false, "Tick immediately (by default waits for first defined")
+}
+
+func Action(cmd *cobra.Command, args []string) {
+	cfg, err := cachet.New(cfgFile)
+	if err != nil {
+		logrus.Panicf("Unable to start (reading config): %v", err)
+	}
+
+	if immediate, err := cmd.Flags().GetBool("immediate"); err == nil && immediate {
+		cfg.Immediate = immediate
+	}
+	if name, err := cmd.Flags().GetString("name"); err == nil && len(name) > 0 {
+		cfg.SystemName = name
+	}
+
+	logrus.SetOutput(getLogger(cmd))
+	if format, err := cmd.Flags().GetString("format"); err == nil && format == "json" {
+		logrus.SetFormatter(&logrus.JSONFormatter{})
+	}
+
+	if valid := cfg.Validate(); !valid {
+		logrus.Errorf("Invalid configuration")
+		os.Exit(1)
+	}
+
+	logrus.Debug("Configuration valid")
+	logrus.Infof("System: %s", cfg.SystemName)
+	// logrus.Infof("API: %s", cfg.API.URL)
+	logrus.Infof("Monitors: %d", len(cfg.Monitors))
+	logrus.Infof("Backend: %v", strings.Join(cfg.Backend.Describe(), "\n - "))
+
+	logrus.Infof("Pinging backend")
+	if err := cfg.Backend.Ping(); err != nil {
+		logrus.Errorf("Cannot ping backend!\n%v", err)
+		// os.Exit(1)
+	}
+	logrus.Infof("Ping OK")
+	logrus.Warnf("Starting!")
+
+	wg := &sync.WaitGroup{}
+	for index, monitor := range cfg.Monitors {
+		logrus.Infof("Starting Monitor #%d: ", index)
+		logrus.Infof("Features: \n - %v", strings.Join(monitor.Describe(), "\n - "))
+
+		go monitor.Start(monitor.GetTestFunc(), wg, cfg.Backend.Tick, cfg.Immediate)
+	}
+
+	signals := make(chan os.Signal, 1)
+	signal.Notify(signals, os.Interrupt, os.Kill)
+	<-signals
+
+	logrus.Warnf("Abort: Waiting for monitors to finish")
+	for _, mon := range cfg.Monitors {
+		mon.GetMonitor().Stop()
+	}
+
+	wg.Wait()
+}
+
+func getLogger(cmd *cobra.Command) *os.File {
+	logPath, _ := cmd.Flags().GetString("log")
+	if len(logPath) == 0 {
+		return os.Stdout
+	}
+
+	file, err := os.Create(logPath)
+	if err != nil {
+		logrus.Errorf("Unable to open file '%v' for logging: \n%v", logPath, err)
+		os.Exit(1)
+	}
+
+	return file
+}

config.go

@@ -1,22 +1,130 @@
 package cachet
 
 import (
+	"encoding/json"
+	"errors"
+	"io/ioutil"
 	"net"
+	"net/http"
+	"net/url"
 	"os"
 	"strings"
-	"time"
 
-	"github.com/Sirupsen/logrus"
+	"github.com/castawaylabs/cachet-monitor/backends"
+	cachetbackend "github.com/castawaylabs/cachet-monitor/backends/cachet"
+	"github.com/castawaylabs/cachet-monitor/monitors"
+
+	"github.com/mitchellh/mapstructure"
+	"github.com/sirupsen/logrus"
+	yaml "gopkg.in/yaml.v2"
 )
 
 type CachetMonitor struct {
-	SystemName  string                   `json:"system_name" yaml:"system_name"`
-	DateFormat  string                   `json:"date_format" yaml:"date_format"`
-	API         CachetAPI                `json:"api"`
 	RawMonitors []map[string]interface{} `json:"monitors" yaml:"monitors"`
+	RawBackend  map[string]interface{}   `json:"backend" yaml:"backend"`
 
-	Monitors  []MonitorInterface `json:"-" yaml:"-"`
-	Immediate bool               `json:"-" yaml:"-"`
+	SystemName string                      `json:"system_name" yaml:"system_name"`
+	Backend    backends.BackendInterface   `json:"-" yaml:"-"`
+	Monitors   []monitors.MonitorInterface `json:"-" yaml:"-"`
+	Immediate  bool                        `json:"-" yaml:"-"`
+}
+
+func New(path string) (*CachetMonitor, error) {
+	var cfg *CachetMonitor
+	var data []byte
+
+	// test if its a url
+	url, err := url.ParseRequestURI(path)
+	if err == nil && len(url.Scheme) > 0 {
+		// download config
+		response, err := http.Get(path)
+		if err != nil {
+			logrus.Warn("Unable to download network configuration")
+			return nil, err
+		}
+
+		defer response.Body.Close()
+		data, _ = ioutil.ReadAll(response.Body)
+
+		logrus.Info("Downloaded network configuration.")
+	} else {
+		data, err = ioutil.ReadFile(path)
+		if err != nil {
+			return nil, errors.New("Unable to open file: '" + path + "'")
+		}
+	}
+
+	if strings.HasSuffix(path, ".yaml") || strings.HasSuffix(path, ".yml") {
+		err = yaml.Unmarshal(data, &cfg)
+	} else {
+		err = json.Unmarshal(data, &cfg)
+	}
+
+	if err != nil {
+		logrus.Warnf("Unable to parse configuration file")
+		return nil, err
+	}
+
+	// get default type
+	if backend, ok := cfg.RawBackend["type"].(string); !ok {
+		err = errors.New("Cannot determine backend type")
+	} else {
+		switch backend {
+		case "cachet":
+			var backend cachetbackend.CachetBackend
+			err = mapstructure.Decode(cfg.RawBackend, &backend)
+			cfg.Backend = &backend
+			// backend.config = cfg
+		default:
+			err = errors.New("Invalid backend type: %v" + backend)
+		}
+	}
+
+	if errs := cfg.Backend.Validate(); len(errs) > 0 {
+		logrus.Errorf("Backend validation errors: %v", errs)
+		os.Exit(1)
+	}
+
+	if err != nil {
+		logrus.Errorf("Unable to unmarshal backend: %v", err)
+		return nil, err
+	}
+
+	cfg.Monitors = make([]monitors.MonitorInterface, len(cfg.RawMonitors))
+	for index, rawMonitor := range cfg.RawMonitors {
+		var t monitors.MonitorInterface
+
+		// get default type
+		monType := GetMonitorType("")
+		if t, ok := rawMonitor["type"].(string); ok {
+			monType = GetMonitorType(t)
+		}
+
+		switch monType {
+		case "http":
+			var mon monitors.HTTPMonitor
+			err = mapstructure.Decode(rawMonitor, &mon)
+			t = &mon
+		case "dns":
+			var mon monitors.DNSMonitor
+			err = mapstructure.Decode(rawMonitor, &mon)
+			t = &mon
+		default:
+			logrus.Errorf("Invalid monitor type (index: %d) %v", index, monType)
+			continue
+		}
+
+		if err != nil {
+			logrus.Errorf("Unable to unmarshal monitor to type (index: %d): %v", index, err)
+			continue
+		}
+
+		mon := t.GetMonitor()
+		mon.Type = monType
+		cfg.Monitors[index] = t
+	}
+
+	return cfg, err
 }
 
 // Validate configuration
@@ -28,22 +136,13 @@ func (cfg *CachetMonitor) Validate() bool {
 		cfg.SystemName = getHostname()
 	}
 
-	if len(cfg.DateFormat) == 0 {
-		cfg.DateFormat = DefaultTimeFormat
-	}
-
-	if len(cfg.API.Token) == 0 || len(cfg.API.URL) == 0 {
-		logrus.Warnf("API URL or API Token missing.\nGet help at https://github.com/castawaylabs/cachet-monitor")
-		valid = false
-	}
-
 	if len(cfg.Monitors) == 0 {
 		logrus.Warnf("No monitors defined!\nSee help for example configuration")
 		valid = false
 	}
 
 	for index, monitor := range cfg.Monitors {
-		if errs := monitor.Validate(); len(errs) > 0 {
+		if errs := monitor.Validate(cfg.Backend.ValidateMonitor); len(errs) > 0 {
 			logrus.Warnf("Monitor validation errors (index %d): %v", index, "\n - "+strings.Join(errs, "\n - "))
 			valid = false
 		}
@@ -67,10 +166,6 @@ func getHostname() string {
 	return addrs[0].String()
 }
 
-func getMs() int64 {
-	return time.Now().UnixNano() / int64(time.Millisecond)
-}
-
 func GetMonitorType(t string) string {
 	if len(t) == 0 {
 		return "http"
@@ -78,12 +173,3 @@ func GetMonitorType(t string) string {
 
 	return strings.ToLower(t)
 }
-
-func getTemplateData(monitor *AbstractMonitor) map[string]interface{} {
-	return map[string]interface{}{
-		"SystemName": monitor.config.SystemName,
-		"API":        monitor.config.API,
-		"Monitor":    monitor,
-		"now":        time.Now().Format(monitor.config.DateFormat),
-	}
-}

example.cachet-monitor.service

@@ -0,0 +1,20 @@
+[Unit]
+Description=Cachet Monitor
+After=syslog.target
+After=network.target
+#After=mysqld.service
+#After=postgresql.service
+#After=memcached.service
+#After=redis.service
+
+[Service]
+Type=simple
+User=root
+Group=root
+WorkingDirectory=/root
+ExecStart=/root/cachet-monitor -c /etc/cachet-monitor.yaml
+Restart=always
+Environment=USER=root HOME=/root
+
+[Install]
+WantedBy=multi-user.target

example.upstart.conf

@@ -0,0 +1,14 @@
+description "Cachet Monitor"
+
+start on startup
+
+env USER=root
+env HOME=/root
+
+setuid root
+setgid root
+chdir /root
+
+script
+	exec cachet-monitor -c /cachet-monitor.json --immediate
+end script

go.mod

@@ -0,0 +1,17 @@
+module github.com/castawaylabs/cachet-monitor
+
+go 1.12
+
+require (
+	github.com/gizak/termui v2.3.0+incompatible // indirect
+	github.com/maruel/panicparse v1.2.1 // indirect
+	github.com/mattn/go-runewidth v0.0.4 // indirect
+	github.com/miekg/dns v1.1.13
+	github.com/mitchellh/go-wordwrap v1.0.0 // indirect
+	github.com/mitchellh/mapstructure v1.1.2
+	github.com/nsf/termbox-go v0.0.0-20190325093121-288510b9734e // indirect
+	github.com/sirupsen/logrus v1.4.2
+	github.com/spf13/cobra v0.0.4
+	golang.org/x/net v0.0.0-20190522155817-f3200d17e092 // indirect
+	gopkg.in/yaml.v2 v2.2.2
+)

go.sum

@@ -0,0 +1,63 @@
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
+github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
+github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=
+github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
+github.com/cpuguy83/go-md2man v1.0.10/go.mod h1:SmD6nW6nTyfqj6ABTjUi3V3JVMnlJmwcJI5acqYI6dE=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
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+github.com/magiconair/properties v1.8.0/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
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incident.go

@@ -1,112 +0,0 @@
-package cachet
-
-import (
-	"encoding/json"
-	"fmt"
-	"strconv"
-
-	"github.com/Sirupsen/logrus"
-)
-
-// Incident Cachet data model
-type Incident struct {
-	ID      int    `json:"id"`
-	Name    string `json:"name"`
-	Message string `json:"message"`
-	Status  int    `json:"status"`
-	Visible int    `json"visible"`
-	Notify  bool   `json:"notify"`
-
-	ComponentID     int `json:"component_id"`
-	ComponentStatus int `json:"component_status"`
-}
-
-// Send - Create or Update incident
-func (incident *Incident) Send(cfg *CachetMonitor) error {
-	switch incident.Status {
-	case 1, 2, 3:
-		// partial outage
-		incident.ComponentStatus = 3
-
-		componentStatus, err := incident.GetComponentStatus(cfg)
-		if componentStatus == 3 {
-			// major outage
-			incident.ComponentStatus = 4
-		}
-
-		if err != nil {
-			logrus.Warnf("cannot fetch component: %v", err)
-		}
-	case 4:
-		// fixed
-		incident.ComponentStatus = 1
-	}
-
-	requestType := "POST"
-	requestURL := "/incidents"
-	if incident.ID > 0 {
-		requestType = "PUT"
-		requestURL += "/" + strconv.Itoa(incident.ID)
-	}
-
-	jsonBytes, _ := json.Marshal(incident)
-
-	resp, body, err := cfg.API.NewRequest(requestType, requestURL, jsonBytes)
-	if err != nil {
-		return err
-	}
-
-	var data struct {
-		ID int `json:"id"`
-	}
-	if err := json.Unmarshal(body.Data, &data); err != nil {
-		return fmt.Errorf("Cannot parse incident body: %v, %v", err, string(body.Data))
-	}
-
-	incident.ID = data.ID
-	if resp.StatusCode != 200 {
-		return fmt.Errorf("Could not create/update incident!")
-	}
-
-	return nil
-}
-
-func (incident *Incident) GetComponentStatus(cfg *CachetMonitor) (int, error) {
-	resp, body, err := cfg.API.NewRequest("GET", "/components/"+strconv.Itoa(incident.ComponentID), nil)
-	if err != nil {
-		return 0, err
-	}
-
-	if resp.StatusCode != 200 {
-		return 0, fmt.Errorf("Invalid status code. Received %d", resp.StatusCode)
-	}
-
-	var data struct {
-		Status int `json:"status"`
-	}
-	if err := json.Unmarshal(body.Data, &data); err != nil {
-		return 0, fmt.Errorf("Cannot parse component body: %v. Err = %v", string(body.Data), err)
-	}
-
-	return data.Status, nil
-}
-
-// SetInvestigating sets status to Investigating
-func (incident *Incident) SetInvestigating() {
-	incident.Status = 1
-}
-
-// SetIdentified sets status to Identified
-func (incident *Incident) SetIdentified() {
-	incident.Status = 2
-}
-
-// SetWatching sets status to Watching
-func (incident *Incident) SetWatching() {
-	incident.Status = 3
-}
-
-// SetFixed sets status to Fixed
-func (incident *Incident) SetFixed() {
-	incident.Status = 4
-}

make.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+set -e
+
+if [ "$1" == "test" ]; then
+  reflex -r '\.go$' -s -d none -- sh -c 'go test ./...'
+fi
+
+reflex -r '\.go$' -s -d none -- sh -c 'go build -o ./cachet-monitor ./cli/ && ./cachet-monitor -c config.yml'
+exit 0

monitor.go

@@ -1,252 +0,0 @@
-package cachet
-
-import (
-	"sync"
-	"time"
-
-	"github.com/Sirupsen/logrus"
-)
-
-const DefaultInterval = time.Second * 60
-const DefaultTimeout = time.Second
-const DefaultTimeFormat = "15:04:05 Jan 2 MST"
-const HistorySize = 10
-
-type MonitorInterface interface {
-	ClockStart(*CachetMonitor, MonitorInterface, *sync.WaitGroup)
-	ClockStop()
-	tick(MonitorInterface)
-	test() bool
-
-	Validate() []string
-	GetMonitor() *AbstractMonitor
-	Describe() []string
-}
-
-// AbstractMonitor data model
-type AbstractMonitor struct {
-	Name   string
-	Target string
-
-	// (default)http / dns
-	Type   string
-	Strict bool
-
-	Interval time.Duration
-	Timeout  time.Duration
-
-	MetricID    int `mapstructure:"metric_id"`
-	ComponentID int `mapstructure:"component_id"`
-
-	// Templating stuff
-	Template struct {
-		Investigating MessageTemplate
-		Fixed         MessageTemplate
-	}
-
-	// Threshold = percentage / number of down incidents
-	Threshold      float32
-	ThresholdCount bool `mapstructure:"threshold_count"`
-
-	// lag / average(lagHistory) * 100 = percentage above average lag
-	// PerformanceThreshold sets the % limit above which this monitor will trigger degraded-performance
-	// PerformanceThreshold float32
-
-	history []bool
-	// lagHistory     []float32
-	lastFailReason string
-	incident       *Incident
-	config         *CachetMonitor
-
-	// Closed when mon.Stop() is called
-	stopC chan bool
-}
-
-func (mon *AbstractMonitor) Validate() []string {
-	errs := []string{}
-
-	if len(mon.Name) == 0 {
-		errs = append(errs, "Name is required")
-	}
-
-	if mon.Interval < 1 {
-		mon.Interval = DefaultInterval
-	}
-	if mon.Timeout < 1 {
-		mon.Timeout = DefaultTimeout
-	}
-
-	if mon.Timeout > mon.Interval {
-		errs = append(errs, "Timeout greater than interval")
-	}
-
-	if mon.ComponentID == 0 && mon.MetricID == 0 {
-		errs = append(errs, "component_id & metric_id are unset")
-	}
-
-	if mon.Threshold <= 0 {
-		mon.Threshold = 100
-	}
-
-	if err := mon.Template.Fixed.Compile(); err != nil {
-		errs = append(errs, "Could not compile \"fixed\" template: "+err.Error())
-	}
-	if err := mon.Template.Investigating.Compile(); err != nil {
-		errs = append(errs, "Could not compile \"investigating\" template: "+err.Error())
-	}
-
-	return errs
-}
-func (mon *AbstractMonitor) GetMonitor() *AbstractMonitor {
-	return mon
-}
-func (mon *AbstractMonitor) Describe() []string {
-	features := []string{"Type: " + mon.Type}
-
-	if len(mon.Name) > 0 {
-		features = append(features, "Name: "+mon.Name)
-	}
-
-	return features
-}
-
-func (mon *AbstractMonitor) ClockStart(cfg *CachetMonitor, iface MonitorInterface, wg *sync.WaitGroup) {
-	wg.Add(1)
-	mon.config = cfg
-	mon.stopC = make(chan bool)
-	if cfg.Immediate {
-		mon.tick(iface)
-	}
-
-	ticker := time.NewTicker(mon.Interval * time.Second)
-	for {
-		select {
-		case <-ticker.C:
-			mon.tick(iface)
-		case <-mon.stopC:
-			wg.Done()
-			return
-		}
-	}
-}
-
-func (mon *AbstractMonitor) ClockStop() {
-	select {
-	case <-mon.stopC:
-		return
-	default:
-		close(mon.stopC)
-	}
-}
-
-func (mon *AbstractMonitor) test() bool { return false }
-
-func (mon *AbstractMonitor) tick(iface MonitorInterface) {
-	reqStart := getMs()
-	up := iface.test()
-	lag := getMs() - reqStart
-
-	histSize := HistorySize
-	if mon.ThresholdCount {
-		histSize = int(mon.Threshold)
-	}
-
-	if len(mon.history) == histSize-1 {
-		logrus.Warnf("%v is now saturated", mon.Name)
-	}
-	if len(mon.history) >= histSize {
-		mon.history = mon.history[len(mon.history)-(histSize-1):]
-	}
-	mon.history = append(mon.history, up)
-	mon.AnalyseData()
-
-	// report lag
-	if mon.MetricID > 0 {
-		go mon.config.API.SendMetric(mon.MetricID, lag)
-	}
-}
-
-// TODO: test
-// AnalyseData decides if the monitor is statistically up or down and creates / resolves an incident
-func (mon *AbstractMonitor) AnalyseData() {
-	// look at the past few incidents
-	numDown := 0
-	for _, wasUp := range mon.history {
-		if wasUp == false {
-			numDown++
-		}
-	}
-
-	t := (float32(numDown) / float32(len(mon.history))) * 100
-	l := logrus.WithFields(logrus.Fields{
-		"monitor": mon.Name,
-		"time":    time.Now().Format(mon.config.DateFormat),
-	})
-	if numDown == 0 {
-		l.Printf("monitor is up")
-	} else if mon.ThresholdCount {
-		l.Printf("monitor down %d/%d", numDown, int(mon.Threshold))
-	} else {
-		l.Printf("monitor down %.2f%%/%.2f%%", t, mon.Threshold)
-	}
-
-	histSize := HistorySize
-	if mon.ThresholdCount {
-		histSize = int(mon.Threshold)
-	}
-
-	if len(mon.history) != histSize {
-		// not saturated
-		return
-	}
-
-	triggered := (mon.ThresholdCount && numDown == int(mon.Threshold)) || (!mon.ThresholdCount && t > mon.Threshold)
-
-	if triggered && mon.incident == nil {
-		// create incident
-		tplData := getTemplateData(mon)
-		tplData["FailReason"] = mon.lastFailReason
-
-		subject, message := mon.Template.Investigating.Exec(tplData)
-		mon.incident = &Incident{
-			Name:        subject,
-			ComponentID: mon.ComponentID,
-			Message:     message,
-			Notify:      true,
-		}
-
-		// is down, create an incident
-		l.Warnf("creating incident. Monitor is down: %v", mon.lastFailReason)
-		// set investigating status
-		mon.incident.SetInvestigating()
-		// create/update incident
-		if err := mon.incident.Send(mon.config); err != nil {
-			l.Printf("Error sending incident: %v", err)
-		}
-
-		return
-	}
-
-	// still triggered or no incident
-	if triggered || mon.incident == nil {
-		return
-	}
-
-	// was down, created an incident, its now ok, make it resolved.
-	l.Warn("Resolving incident")
-
-	// resolve incident
-	tplData := getTemplateData(mon)
-	tplData["incident"] = mon.incident
-
-	subject, message := mon.Template.Fixed.Exec(tplData)
-	mon.incident.Name = subject
-	mon.incident.Message = message
-	mon.incident.SetFixed()
-	if err := mon.incident.Send(mon.config); err != nil {
-		l.Printf("Error sending incident: %v", err)
-	}
-
-	mon.lastFailReason = ""
-	mon.incident = nil
-}

monitor_test.go

@@ -1,7 +0,0 @@
-package cachet
-
-import (
-	"testing"
-)
-
-func TestAnalyseData(t *testing.T) {}

monitors/dns.go

@@ -1,14 +1,33 @@
-package cachet
+package monitors
 
 import (
+	"errors"
 	"net"
 	"regexp"
 	"strings"
 
-	"github.com/Sirupsen/logrus"
 	"github.com/miekg/dns"
+	"github.com/sirupsen/logrus"
 )
 
+// Investigating template
+var defaultDNSInvestigatingTpl = MessageTemplate{
+	Subject: `{{ .Monitor.Name }} - {{ .SystemName }}`,
+	Message: `{{ .Monitor.Name }} DNS check **failed** (server time: {{ .now }})
+
+{{ .FailReason }}`,
+}
+
+// Fixed template
+var defaultDNSFixedTpl = MessageTemplate{
+	Subject: `{{ .Monitor.Name }} - {{ .SystemName }}`,
+	Message: `**Resolved** - {{ .now }}
+
+- - -
+
+{{ .incident.Message }}`,
+}
+
 type DNSAnswer struct {
 	Regex  string
 	regexp *regexp.Regexp
@@ -28,8 +47,11 @@ type DNSMonitor struct {
 	Answers []DNSAnswer
 }
 
-func (monitor *DNSMonitor) Validate() []string {
-	errs := monitor.AbstractMonitor.Validate()
+func (monitor *DNSMonitor) Validate(validate backendValidateFunc) []string {
+	monitor.Template.Investigating.SetDefault(defaultDNSInvestigatingTpl)
+	monitor.Template.Fixed.SetDefault(defaultDNSFixedTpl)
+
+	errs := monitor.AbstractMonitor.Validate(validate)
 
 	if len(monitor.DNS) == 0 {
 		config, _ := dns.ClientConfigFromFile("/etc/resolv.conf")
@@ -61,7 +83,7 @@ func (monitor *DNSMonitor) Validate() []string {
 	return errs
 }
 
-func (monitor *DNSMonitor) test() bool {
+func (monitor *DNSMonitor) test() (bool, []error) {
 	m := new(dns.Msg)
 	m.SetQuestion(dns.Fqdn(monitor.Target), monitor.question)
 	m.RecursionDesired = true
@@ -70,11 +92,11 @@ func (monitor *DNSMonitor) test() bool {
 	r, _, err := c.Exchange(m, monitor.DNS)
 	if err != nil {
 		logrus.Warnf("DNS error: %v", err)
-		return false
+		return false, []error{err}
 	}
 
 	if r.Rcode != dns.RcodeSuccess {
-		return false
+		return false, []error{errors.New("Invalid status code returned")}
 	}
 
 	for _, check := range monitor.Answers {
@@ -88,11 +110,11 @@ func (monitor *DNSMonitor) test() bool {
 
 		if !found {
 			logrus.Warnf("DNS check failed: %v. Not found in any of %v", check, r.Answer)
-			return false
+			return false, []error{errors.New("Record not found")}
 		}
 	}
 
-	return true
+	return true, nil
 }
 
 func findDNSType(t string) uint16 {

monitors/http.go

@@ -1,7 +1,8 @@
-package cachet
+package monitors
 
 import (
 	"crypto/tls"
+	"errors"
 	"io/ioutil"
 	"net/http"
 	"regexp"
@@ -13,7 +14,7 @@ import (
 // Investigating template
 var defaultHTTPInvestigatingTpl = MessageTemplate{
 	Subject: `{{ .Monitor.Name }} - {{ .SystemName }}`,
-	Message: `{{ .Monitor.Name }} check **failed** (server time: {{ .now }})
+	Message: `{{ .Monitor.Name }} HTTP check **failed** (server time: {{ .now }})
 
 {{ .FailReason }}`,
 }
@@ -41,14 +42,16 @@ type HTTPMonitor struct {
 }
 
 // TODO: test
-func (monitor *HTTPMonitor) test() bool {
+func (monitor *HTTPMonitor) test() (bool, []error) {
 	req, err := http.NewRequest(monitor.Method, monitor.Target, nil)
 	for k, v := range monitor.Headers {
 		req.Header.Add(k, v)
 	}
 
 	transport := http.DefaultTransport.(*http.Transport)
-	transport.TLSClientConfig = &tls.Config{InsecureSkipVerify: monitor.Strict == false}
+	transport.TLSClientConfig = &tls.Config{
+		InsecureSkipVerify: monitor.Strict == false,
+	}
 	client := &http.Client{
 		Timeout:   time.Duration(monitor.Timeout * time.Second),
 		Transport: transport,
@@ -56,40 +59,38 @@ func (monitor *HTTPMonitor) test() bool {
 
 	resp, err := client.Do(req)
 	if err != nil {
-		monitor.lastFailReason = err.Error()
-		return false
+		return false, []error{err}
 	}
 
 	defer resp.Body.Close()
 
 	if monitor.ExpectedStatusCode > 0 && resp.StatusCode != monitor.ExpectedStatusCode {
-		monitor.lastFailReason = "Expected HTTP response status: " + strconv.Itoa(monitor.ExpectedStatusCode) + ", got: " + strconv.Itoa(resp.StatusCode)
-		return false
+		fail := "Expected HTTP response status: " + strconv.Itoa(monitor.ExpectedStatusCode) + ", got: " + strconv.Itoa(resp.StatusCode)
+		return false, []error{errors.New(fail)}
 	}
 
 	if monitor.bodyRegexp != nil {
 		// check response body
 		responseBody, err := ioutil.ReadAll(resp.Body)
 		if err != nil {
-			monitor.lastFailReason = err.Error()
-			return false
+			return false, []error{err}
 		}
 
 		if !monitor.bodyRegexp.Match(responseBody) {
-			monitor.lastFailReason = "Unexpected body: " + string(responseBody) + ".\nExpected to match: " + monitor.ExpectedBody
-			return false
+			fail := "Unexpected body: " + string(responseBody) + ".\nExpected to match: " + monitor.ExpectedBody
+			return false, []error{errors.New(fail)}
 		}
 	}
 
-	return true
+	return true, nil
 }
 
 // TODO: test
-func (mon *HTTPMonitor) Validate() []string {
+func (mon *HTTPMonitor) Validate(validate backendValidateFunc) []string {
 	mon.Template.Investigating.SetDefault(defaultHTTPInvestigatingTpl)
 	mon.Template.Fixed.SetDefault(defaultHTTPFixedTpl)
 
-	errs := mon.AbstractMonitor.Validate()
+	errs := mon.AbstractMonitor.Validate(validate)
 
 	if len(mon.ExpectedBody) > 0 {
 		exp, err := regexp.Compile(mon.ExpectedBody)

monitors/monitor.go

@@ -0,0 +1,257 @@
+package monitors
+
+import (
+	"sync"
+	"time"
+
+	"github.com/sirupsen/logrus"
+)
+
+const DefaultInterval = time.Second * 60
+const DefaultTimeout = time.Second
+const HistorySize = 10
+
+type MonitorStatus string
+
+const (
+	MonitorStatusUp           = "up"
+	MonitorStatusDown         = "down"
+	MonitorStatusNotSaturated = "unsaturated"
+)
+
+type backendValidateFunc = func(monitor *AbstractMonitor) []string
+type MonitorTestFunc func() (up bool, errs []error)
+type MonitorTickFunc func(monitor MonitorInterface, status MonitorStatus, errs []error, lag int64)
+
+type MonitorInterface interface {
+	Start(MonitorTestFunc, *sync.WaitGroup, MonitorTickFunc, bool)
+	Stop()
+
+	tick(MonitorTestFunc) (status MonitorStatus, errors []error, lag int64)
+	test() (bool, []error)
+
+	Validate(validate backendValidateFunc) []string
+	Describe() []string
+
+	GetMonitor() *AbstractMonitor
+	GetTestFunc() MonitorTestFunc
+	GetLastStatus() MonitorStatus
+	UpdateLastStatus(status MonitorStatus) (old MonitorStatus)
+}
+
+// AbstractMonitor data model
+type AbstractMonitor struct {
+	Name   string
+	Target string
+
+	// (default)http / dns
+	Type   string
+	Strict bool
+
+	Interval time.Duration
+	Timeout  time.Duration
+	Params   map[string]interface{}
+
+	// Templating stuff
+	Template MonitorTemplates
+
+	// Threshold = percentage / number of down incidents
+	Threshold      float32
+	ThresholdCount bool `mapstructure:"threshold_count"`
+
+	// lag / average(lagHistory) * 100 = percentage above average lag
+	// PerformanceThreshold sets the % limit above which this monitor will trigger degraded-performance
+	// PerformanceThreshold float32
+
+	history    []bool
+	lastStatus MonitorStatus
+
+	// Closed when mon.Stop() is called
+	stopC chan bool
+}
+
+func (mon *AbstractMonitor) Validate(validate backendValidateFunc) []string {
+	errs := []string{}
+
+	if len(mon.Name) == 0 {
+		errs = append(errs, "Name is required")
+	}
+
+	if mon.Interval < 1 {
+		mon.Interval = DefaultInterval
+	}
+	if mon.Timeout < 1 {
+		mon.Timeout = DefaultTimeout
+	}
+
+	if mon.Timeout > mon.Interval {
+		errs = append(errs, "Timeout greater than interval")
+	}
+
+	// get the backend to validate the monitor
+	errs = append(errs, validate(mon)...)
+
+	if mon.Threshold <= 0 {
+		mon.Threshold = 100
+	}
+
+	// if len(mon.Template.Fixed.Message) == 0 || len(mon.Template.Fixed.Subject) == 0 {
+	// 	errs = append(errs, "\"fixed\" template empty/missing")
+	// }
+	// if len(mon.Template.Investigating.Message) == 0 || len(mon.Template.Investigating.Subject) == 0 {
+	// 	errs = append(errs, "\"investigating\" template empty/missing")
+	// }
+	if err := mon.Template.Fixed.Compile(); err != nil {
+		errs = append(errs, "Could not compile \"fixed\" template: "+err.Error())
+	}
+	if err := mon.Template.Investigating.Compile(); err != nil {
+		errs = append(errs, "Could not compile \"investigating\" template: "+err.Error())
+	}
+
+	return errs
+}
+
+func (mon *AbstractMonitor) GetMonitor() *AbstractMonitor {
+	return mon
+}
+
+func (mon *AbstractMonitor) Describe() []string {
+	features := []string{"Type: " + mon.Type}
+
+	if len(mon.Name) > 0 {
+		features = append(features, "Name: "+mon.Name)
+	}
+
+	return features
+}
+
+func (mon *AbstractMonitor) Start(testFunc MonitorTestFunc, wg *sync.WaitGroup, tickFunc MonitorTickFunc, immediate bool) {
+	wg.Add(1)
+
+	mon.stopC = make(chan bool)
+	if immediate {
+		status, errs, lag := mon.tick(testFunc)
+		tickFunc(mon, status, errs, lag)
+	}
+
+	ticker := time.NewTicker(mon.Interval * time.Second)
+	for {
+		select {
+		case <-ticker.C:
+			status, errs, lag := mon.tick(testFunc)
+			tickFunc(mon, status, errs, lag)
+		case <-mon.stopC:
+			wg.Done()
+			return
+		}
+	}
+}
+
+func (mon *AbstractMonitor) Stop() {
+	select {
+	case <-mon.stopC:
+		return
+	default:
+		close(mon.stopC)
+	}
+}
+
+func (mon *AbstractMonitor) tick(testFunc MonitorTestFunc) (status MonitorStatus, errors []error, lag int64) {
+	reqStart := getMs()
+	up, errs := testFunc()
+	lag = getMs() - reqStart
+
+	histSize := HistorySize
+	if mon.ThresholdCount {
+		histSize = int(mon.Threshold)
+	}
+
+	if len(mon.history) == histSize-1 {
+		logrus.WithFields(logrus.Fields{
+			"monitor": mon.Name,
+		}).Warn("monitor saturated")
+	}
+	if len(mon.history) >= histSize {
+		mon.history = mon.history[len(mon.history)-(histSize-1):]
+	}
+	mon.history = append(mon.history, up)
+	status = mon.GetStatus()
+	errors = errs
+
+	return
+}
+
+// TODO: test
+// AnalyseData decides if the monitor is statistically up or down and creates / resolves an incident
+func (mon *AbstractMonitor) GetStatus() MonitorStatus {
+	numDown := 0
+	for _, wasUp := range mon.history {
+		if wasUp == false {
+			numDown++
+		}
+	}
+
+	t := (float32(numDown) / float32(len(mon.history))) * 100
+	logFields := logrus.Fields{"monitor": mon.Name}
+	// stop reporting time for jsonformatter, it's there by default
+	if _, ok := logrus.StandardLogger().Formatter.(*logrus.JSONFormatter); !ok {
+		logFields["t"] = time.Now()
+	}
+	l := logrus.WithFields(logFields)
+
+	symbol := "⚠️"
+	if t == 100 {
+		symbol = "❌"
+	}
+	if numDown == 0 {
+		l.Printf("👍 up")
+	} else if mon.ThresholdCount {
+		l.Printf("%v down (%d/%d)", symbol, numDown, int(mon.Threshold))
+	} else {
+		l.Printf("%v down %.0f%%/%.0f%%", symbol, t, mon.Threshold)
+	}
+
+	histSize := HistorySize
+	if mon.ThresholdCount {
+		histSize = int(mon.Threshold)
+	}
+
+	if len(mon.history) != histSize {
+		// not saturated
+		return MonitorStatusNotSaturated
+	}
+
+	var down bool
+	if mon.ThresholdCount {
+		down = numDown >= int(mon.Threshold)
+	} else {
+		down = t >= mon.Threshold
+	}
+
+	if !down {
+		return MonitorStatusUp
+	}
+
+	return MonitorStatusDown
+}
+
+func (mon *AbstractMonitor) GetTestFunc() MonitorTestFunc {
+	return mon.test
+}
+
+func (mon *AbstractMonitor) GetLastStatus() MonitorStatus {
+	return mon.lastStatus
+}
+
+func (mon *AbstractMonitor) UpdateLastStatus(status MonitorStatus) (old MonitorStatus) {
+	old = mon.lastStatus
+	mon.lastStatus = status
+
+	return
+}
+
+func (mon *AbstractMonitor) test() (bool, []error) { return false, nil }
+
+func getMs() int64 {
+	return time.Now().UnixNano() / int64(time.Millisecond)
+}

monitors/template.go

@@ -1,10 +1,15 @@
-package cachet
+package monitors
 
 import (
 	"bytes"
 	"text/template"
 )
 
+type MonitorTemplates struct {
+	Investigating MessageTemplate
+	Fixed         MessageTemplate
+}
+
 type MessageTemplate struct {
 	Subject string `json:"subject"`
 	Message string `json:"message"`

readme.md

@@ -39,6 +39,7 @@ monitors:
     metric_id: 4
 
     # custom templates (see readme for details)
+    # leave empty for defaults
     template:
       investigating:
         subject: "{{ .Monitor.Name }} - {{ .SystemName }}"
@@ -85,10 +86,11 @@ monitors:
 ## Installation
 
 1. Download binary from [release page](https://github.com/CastawayLabs/cachet-monitor/releases)
-2. Create a configuration
-3. `cachet-monitor -c /etc/cachet-monitor.yaml`
+2. Add the binary to an executable path (/usr/bin, etc.)
+3. Create a configuration following provided examples
+4. `cachet-monitor -c /etc/cachet-monitor.yaml`
 
-pro tip: run in background using `nohup cachet-monitor 2>&1 > /var/log/cachet-monitor.log &`
+pro tip: run in background using `nohup cachet-monitor 2>&1 > /var/log/cachet-monitor.log &`, or use a tmux/screen session
 
 ```
 Usage:
@@ -116,18 +118,26 @@ Environment varaibles:
   CACHET_DEV      set to enable dev logging
 ```
 
+## Init script
+
+If your system is running systemd (like Debian, Ubuntu 16.04, Fedora, RHEL7, or Archlinux) you can use the provided example file: [example.cachet-monitor.service](https://github.com/CastawayLabs/cachet-monitor/blob/master/example.cachet-monitor.service).
+
+1. Simply put it in the right place with `cp example.cachet-monitor.service /etc/systemd/system/cachet-monitor.service`
+2. Then do a `systemctl daemon-reload` in your terminal to update Systemd configuration
+3. Finally you can start cachet-monitor on every startup with `systemctl enable cachet-monitor.service`! 👍
+
 ## Templates
 
 This package makes use of [`text/template`](https://godoc.org/text/template). [Default HTTP template](https://github.com/CastawayLabs/cachet-monitor/blob/master/http.go#L14)
 
 The following variables are available:
 
-| Root objects  |
-| ------------- | -----------------
-| `.SystemName` | system name
-| `.API`        | `api` object from configuration
-| `.Monitor`    | `monitor` object from configuration
-| `.now`        | formatted date string
+| Root objects  | Description                         |
+| ------------- | ------------------------------------|
+| `.SystemName` | system name                         | 
+| `.API`        | `api` object from configuration     |
+| `.Monitor`    | `monitor` object from configuration |
+| `.now`        | formatted date string               |
 
 | Monitor variables  |
 | ------------------ |
@@ -161,27 +171,3 @@ We'll happily accept contributions for the following (non exhaustive list).
 - Implement TCP check
 - Any bug fixes / code improvements
 - Test cases
-
-## License
-
-MIT License
-
-Copyright (c) 2016 Castaway Labs LLC
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.