json http handler - improved sample chart data

core/sample.go

@@ -19,10 +19,14 @@ import (
 	"fmt"
 	"github.com/hunterlong/statping/types"
 	"github.com/hunterlong/statping/utils"
-	"math/rand"
 	"time"
 )
 
+var (
+	sampleStart = time.Now().Add((-24 * 7) * time.Hour).UTC()
+	sampleHits  = 9900.
+)
+
 // InsertSampleData will create the example/dummy services for a brand new Statping installation
 func InsertSampleData() error {
 	utils.Log(1, "Inserting Sample Data...")
@@ -163,26 +167,31 @@ func insertSampleCheckins() error {
 
 // InsertSampleHits will create a couple new hits for the sample services
 func InsertSampleHits() error {
-	since := time.Now().Add((-24 * 7) * time.Hour).UTC()
-	for i := int64(1); i <= 5; i++ {
-		service := SelectService(i)
-		utils.Log(1, fmt.Sprintf("Adding %v sample hit records to service %v", 360, service.Name))
-		createdAt := since
-		alpha := float64(1.05)
 
-		for hi := int64(1); hi <= 168; hi++ {
-			alpha += 0.01
-			rand.Seed(time.Now().UnixNano())
-			latency := rand.Float64() * alpha
-			createdAt = createdAt.Add(1 * time.Hour)
+	for i := int64(1); i <= 5; i++ {
+
+		service := SelectService(i)
+		seed := time.Now().UnixNano()
+
+		utils.Log(1, fmt.Sprintf("Adding %v sample hit records to service %v", sampleHits, service.Name))
+		createdAt := sampleStart
+
+		p := utils.NewPerlin(2., 2., 10, seed)
+
+		for hi := 0.; hi <= float64(sampleHits); hi++ {
+
+			latency := p.Noise1D(hi / 500)
+			createdAt = createdAt.Add(60 * time.Second)
 			hit := &types.Hit{
 				Service:   service.Id,
 				CreatedAt: createdAt,
 				Latency:   latency,
 			}
 			service.CreateHit(hit)
+
 		}
 	}
+
 	return nil
 }
 
@@ -397,7 +406,7 @@ func InsertLargeSampleData() error {
 
 	var dayAgo = time.Now().Add((-24 * 90) * time.Hour)
 
-	insertHitRecords(dayAgo, 1450)
+	insertHitRecords(dayAgo, 5450)
 
 	insertFailureRecords(dayAgo, 730)
 
@@ -432,9 +441,16 @@ func insertHitRecords(since time.Time, amount int64) {
 		utils.Log(1, fmt.Sprintf("Adding %v hit records to service %v", amount, service.Name))
 		createdAt := since
 
+		p := utils.NewPerlin(2, 2, 5, time.Now().UnixNano())
+
+		utils.Log(1, fmt.Sprint(p))
+
 		for hi := int64(1); hi <= amount; hi++ {
-			rand.Seed(time.Now().UnixNano())
-			latency := rand.Float64()
+
+			latency := p.Noise1D(float64(hi / 10))
+
+			fmt.Printf("%0.0f\t%0.4f\n", hi, latency)
+
 			createdAt = createdAt.Add(1 * time.Minute)
 			hit := &types.Hit{
 				Service:   service.Id,

handlers/api.go

@@ -16,7 +16,6 @@
 package handlers
 
 import (
-	"encoding/json"
 	"errors"
 	"fmt"
 	"github.com/hunterlong/statping/core"
@@ -42,8 +41,7 @@ func apiIndexHandler(w http.ResponseWriter, r *http.Request) {
 	}
 	coreClone := *core.CoreApp
 	coreClone.Started = utils.Timezoner(core.CoreApp.Started, core.CoreApp.Timezone)
-	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(coreClone)
+	returnJson(coreClone, w, r)
 }
 
 func apiRenewHandler(w http.ResponseWriter, r *http.Request) {
@@ -77,8 +75,7 @@ func sendErrorJson(err error, w http.ResponseWriter, r *http.Request) {
 		Status: "error",
 		Error:  err.Error(),
 	}
-	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(output)
+	returnJson(output, w, r)
 }
 
 func sendJsonAction(obj interface{}, method string, w http.ResponseWriter, r *http.Request) {
@@ -132,8 +129,7 @@ func sendJsonAction(obj interface{}, method string, w http.ResponseWriter, r *ht
 		Output: obj,
 	}
 
-	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(output)
+	returnJson(output, w, r)
 }
 
 func sendUnauthorizedJson(w http.ResponseWriter, r *http.Request) {
@@ -141,7 +137,6 @@ func sendUnauthorizedJson(w http.ResponseWriter, r *http.Request) {
 		Status: "error",
 		Error:  errors.New("not authorized").Error(),
 	}
-	w.Header().Set("Content-Type", "application/json")
 	w.WriteHeader(http.StatusUnauthorized)
-	json.NewEncoder(w).Encode(output)
+	returnJson(output, w, r)
 }

handlers/checkin.go

@@ -37,8 +37,7 @@ func apiAllCheckinsHandler(w http.ResponseWriter, r *http.Request) {
 		c.Hits = c.AllHits()
 		c.Failures = c.LimitedFailures(64)
 	}
-	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(checkins)
+	returnJson(checkins, w, r)
 }
 
 func apiCheckinHandler(w http.ResponseWriter, r *http.Request) {
@@ -54,8 +53,7 @@ func apiCheckinHandler(w http.ResponseWriter, r *http.Request) {
 	}
 	checkin.Hits = checkin.LimitedHits(32)
 	checkin.Failures = checkin.LimitedFailures(32)
-	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(checkin)
+	returnJson(checkin, w, r)
 }
 
 func checkinCreateHandler(w http.ResponseWriter, r *http.Request) {

handlers/groups.go

@@ -32,8 +32,7 @@ func apiAllGroupHandler(w http.ResponseWriter, r *http.Request) {
 	}
 	auth := IsUser(r)
 	groups := core.SelectGroups(false, auth)
-	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(groups)
+	returnJson(groups, w, r)
 }
 
 // apiGroupHandler will show a single group
@@ -48,8 +47,7 @@ func apiGroupHandler(w http.ResponseWriter, r *http.Request) {
 		sendErrorJson(errors.New("group not found"), w, r)
 		return
 	}
-	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(group)
+	returnJson(group, w, r)
 }
 
 // apiCreateGroupHandler accepts a POST method to create new groups
@@ -112,6 +110,5 @@ func apiGroupReorderHandler(w http.ResponseWriter, r *http.Request) {
 		group.Order = g.Order
 		group.Update()
 	}
-	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(newOrder)
+	returnJson(newOrder, w, r)
 }

handlers/handlers.go

@@ -17,6 +17,7 @@ package handlers
 
 import (
 	"crypto/tls"
+	"encoding/json"
 	"fmt"
 	"github.com/gorilla/sessions"
 	"github.com/hunterlong/statping/core"
@@ -256,6 +257,12 @@ func executeJSResponse(w http.ResponseWriter, r *http.Request, file string, data
 	}
 }
 
+func returnJson(d interface{}, w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+	w.Header().Set("Access-Control-Allow-Origin", "*")
+	json.NewEncoder(w).Encode(d)
+}
+
 // error404Handler is a HTTP handler for 404 error pages
 func error404Handler(w http.ResponseWriter, r *http.Request) {
 	if usingSSL {

handlers/index.go

@@ -16,7 +16,6 @@
 package handlers
 
 import (
-	"encoding/json"
 	"github.com/hunterlong/statping/core"
 	"net/http"
 )
@@ -30,10 +29,9 @@ func indexHandler(w http.ResponseWriter, r *http.Request) {
 }
 
 func healthCheckHandler(w http.ResponseWriter, r *http.Request) {
-	w.Header().Set("Content-Type", "application/json")
 	health := map[string]interface{}{
 		"services": len(core.Services()),
 		"online":   core.Configs != nil,
 	}
-	json.NewEncoder(w).Encode(health)
+	returnJson(health, w, r)
 }

handlers/messages.go

@@ -59,8 +59,7 @@ func apiAllMessagesHandler(w http.ResponseWriter, r *http.Request) {
 		sendErrorJson(err, w, r)
 		return
 	}
-	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(messages)
+	returnJson(messages, w, r)
 }
 
 func apiMessageCreateHandler(w http.ResponseWriter, r *http.Request) {
@@ -95,8 +94,7 @@ func apiMessageGetHandler(w http.ResponseWriter, r *http.Request) {
 		sendErrorJson(err, w, r)
 		return
 	}
-	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(message)
+	returnJson(message, w, r)
 }
 
 func apiMessageDeleteHandler(w http.ResponseWriter, r *http.Request) {

handlers/notifications.go

@@ -36,8 +36,7 @@ func apiNotifiersHandler(w http.ResponseWriter, r *http.Request) {
 		notif := n.(notifier.Notifier)
 		notifiers = append(notifiers, notif.Select())
 	}
-	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(notifiers)
+	returnJson(notifiers, w, r)
 }
 
 func apiNotifierGetHandler(w http.ResponseWriter, r *http.Request) {
@@ -51,8 +50,7 @@ func apiNotifierGetHandler(w http.ResponseWriter, r *http.Request) {
 		sendErrorJson(err, w, r)
 		return
 	}
-	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(notifierObj)
+	returnJson(notifierObj, w, r)
 }
 
 func apiNotifierUpdateHandler(w http.ResponseWriter, r *http.Request) {

handlers/services.go

@@ -78,8 +78,7 @@ func reorderServiceHandler(w http.ResponseWriter, r *http.Request) {
 		service.Order = s.Order
 		service.Update(false)
 	}
-	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(newOrder)
+	returnJson(newOrder, w, r)
 }
 
 func servicesViewHandler(w http.ResponseWriter, r *http.Request) {
@@ -141,8 +140,7 @@ func apiServiceHandler(w http.ResponseWriter, r *http.Request) {
 		sendErrorJson(errors.New("service not found"), w, r)
 		return
 	}
-	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(servicer)
+	returnJson(servicer, w, r)
 }
 
 func apiCreateServiceHandler(w http.ResponseWriter, r *http.Request) {
@@ -207,8 +205,7 @@ func apiServiceDataHandler(w http.ResponseWriter, r *http.Request) {
 	end := time.Unix(endField, 0)
 
 	obj := core.GraphDataRaw(service, start, end, grouping, "latency")
-	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(obj)
+	returnJson(obj, w, r)
 }
 
 func apiServicePingDataHandler(w http.ResponseWriter, r *http.Request) {
@@ -227,9 +224,7 @@ func apiServicePingDataHandler(w http.ResponseWriter, r *http.Request) {
 	end := time.Unix(endField, 0)
 
 	obj := core.GraphDataRaw(service, start, end, grouping, "ping_time")
-
-	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(obj)
+	returnJson(obj, w, r)
 }
 
 type dataXy struct {
@@ -285,9 +280,7 @@ func apiServiceHeatmapHandler(w http.ResponseWriter, r *http.Request) {
 		month = 1
 
 	}
-
-	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(monthOutput)
+	returnJson(monthOutput, w, r)
 }
 
 func apiServiceDeleteHandler(w http.ResponseWriter, r *http.Request) {
@@ -315,8 +308,7 @@ func apiAllServicesHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	services := core.Services()
-	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(services)
+	returnJson(services, w, r)
 }
 
 func servicesDeleteFailuresHandler(w http.ResponseWriter, r *http.Request) {
@@ -345,8 +337,7 @@ func apiServiceFailuresHandler(w http.ResponseWriter, r *http.Request) {
 		sendErrorJson(errors.New("service not found"), w, r)
 		return
 	}
-	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(servicer.AllFailures())
+	returnJson(servicer.AllFailures(), w, r)
 }
 
 func apiServiceHitsHandler(w http.ResponseWriter, r *http.Request) {
@@ -367,6 +358,5 @@ func apiServiceHitsHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(hits)
+	returnJson(hits, w, r)
 }

handlers/users.go

@@ -59,8 +59,7 @@ func apiUserHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	user.Password = ""
-	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(user)
+	returnJson(user, w, r)
 }
 
 func apiUserUpdateHandler(w http.ResponseWriter, r *http.Request) {
@@ -121,8 +120,7 @@ func apiAllUsersHandler(w http.ResponseWriter, r *http.Request) {
 		sendErrorJson(err, w, r)
 		return
 	}
-	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(users)
+	returnJson(users, w, r)
 }
 
 func apiCreateUsersHandler(w http.ResponseWriter, r *http.Request) {

utils/utils.go

@@ -22,6 +22,8 @@ import (
 	"github.com/ararog/timeago"
 	"io"
 	"io/ioutil"
+	"math"
+	"math/rand"
 	"net/http"
 	"os"
 	"os/exec"
@@ -288,3 +290,115 @@ func HttpRequest(url, method string, content interface{}, headers []string, body
 	contents, err := ioutil.ReadAll(resp.Body)
 	return contents, resp, err
 }
+
+const (
+	B  = 0x100
+	N  = 0x1000
+	BM = 0xff
+)
+
+func NewPerlin(alpha, beta float64, n int, seed int64) *Perlin {
+	return NewPerlinRandSource(alpha, beta, n, rand.NewSource(seed))
+}
+
+// Perlin is the noise generator
+type Perlin struct {
+	alpha float64
+	beta  float64
+	n     int
+
+	p  [B + B + 2]int
+	g3 [B + B + 2][3]float64
+	g2 [B + B + 2][2]float64
+	g1 [B + B + 2]float64
+}
+
+func NewPerlinRandSource(alpha, beta float64, n int, source rand.Source) *Perlin {
+	var p Perlin
+	var i int
+
+	p.alpha = alpha
+	p.beta = beta
+	p.n = n
+
+	r := rand.New(source)
+
+	for i = 0; i < B; i++ {
+		p.p[i] = i
+		p.g1[i] = float64((r.Int()%(B+B))-B) / B
+
+		for j := 0; j < 2; j++ {
+			p.g2[i][j] = float64((r.Int()%(B+B))-B) / B
+		}
+
+		normalize2(&p.g2[i])
+	}
+
+	for ; i > 0; i-- {
+		k := p.p[i]
+		j := r.Int() % B
+		p.p[i] = p.p[j]
+		p.p[j] = k
+	}
+
+	for i := 0; i < B+2; i++ {
+		p.p[B+i] = p.p[i]
+		p.g1[B+i] = p.g1[i]
+		for j := 0; j < 2; j++ {
+			p.g2[B+i][j] = p.g2[i][j]
+		}
+		for j := 0; j < 3; j++ {
+			p.g3[B+i][j] = p.g3[i][j]
+		}
+	}
+
+	return &p
+}
+
+func normalize2(v *[2]float64) {
+	s := math.Sqrt(v[0]*v[0] + v[1]*v[1])
+	v[0] = v[0] / s
+	v[1] = v[1] / s
+}
+
+func (p *Perlin) Noise1D(x float64) float64 {
+	var scale float64 = 1
+	var sum float64
+	px := x
+
+	for i := 0; i < p.n; i++ {
+		val := p.noise1(px)
+		sum += val / scale
+		scale *= p.alpha
+		px *= p.beta
+	}
+	if sum < 0 {
+		sum = sum * -1
+	}
+	return sum
+}
+
+func (p *Perlin) noise1(arg float64) float64 {
+	var vec [1]float64
+	vec[0] = arg
+
+	t := vec[0] + N
+	bx0 := int(t) & BM
+	bx1 := (bx0 + 1) & BM
+	rx0 := t - float64(int(t))
+	rx1 := rx0 - 1.
+
+	sx := sCurve(rx0)
+	u := rx0 * p.g1[p.p[bx0]]
+	v := rx1 * p.g1[p.p[bx1]]
+
+	return lerp(sx, u, v)
+}
+
+func sCurve(t float64) float64 {
+	return t * t * (3. - 2.*t)
+}
+
+func lerp(t, a, b float64) float64 {
+	return a + t*(b-a)
+}