Cleanup; /api/debug returns JSON

api.go

@@ -57,6 +57,19 @@ func (data *ApiMetricData) AddStats() {
 	}
 }
 
+func (data *ApiMetricData) ScaleBy(f Float) {
+	if f == 0 || f == 1 {
+		return
+	}
+
+	data.Avg *= f
+	data.Min *= f
+	data.Max *= f
+	for i := 0; i < len(data.Data); i++ {
+		data.Data[i] *= f
+	}
+}
+
 func (data *ApiMetricData) PadDataWithNull(from, to int64, metric string) {
 	minfo, ok := memoryStore.metrics[metric]
 	if !ok {
@@ -165,6 +178,7 @@ type ApiQuery struct {
 	Metric      string  `json:"metric"`
 	Hostname    string  `json:"host"`
 	Aggregate   bool    `json:"aggreg"`
+	ScaleFactor Float   `json:"scale-by,omitempty"`
 	Type        *string `json:"type,omitempty"`
 	TypeIds     []int   `json:"type-ids,omitempty"`
 	SubType     *string `json:"subtype,omitempty"`
@@ -260,6 +274,9 @@ func handleQuery(rw http.ResponseWriter, r *http.Request) {
 			if req.WithStats {
 				data.AddStats()
 			}
+			if query.ScaleFactor != 0 {
+				data.ScaleBy(query.ScaleFactor)
+			}
 			if req.WithPadding {
 				data.PadDataWithNull(req.From, req.To, query.Metric)
 			}
@@ -333,17 +350,23 @@ func StartApiServer(ctx context.Context, httpConfig *HttpConfig) error {
 	r.HandleFunc("/api/write", handleWrite)
 	r.HandleFunc("/api/query", handleQuery)
 	r.HandleFunc("/api/debug", func(rw http.ResponseWriter, r *http.Request) {
-		bw := bufio.NewWriter(rw)
-		defer bw.Flush()
+		raw := r.URL.Query().Get("selector")
+		selector := []string{}
+		if len(raw) != 0 {
+			selector = strings.Split(raw, ":")
+		}
 
-		memoryStore.DebugDump(bw)
+		if err := memoryStore.DebugDump(bufio.NewWriter(rw), selector); err != nil {
+			rw.WriteHeader(http.StatusBadRequest)
+			rw.Write([]byte(err.Error()))
+		}
 	})
 
 	server := &http.Server{
 		Handler:      r,
 		Addr:         httpConfig.Address,
-		WriteTimeout: 15 * time.Second,
-		ReadTimeout:  15 * time.Second,
+		WriteTimeout: 30 * time.Second,
+		ReadTimeout:  30 * time.Second,
 	}
 
 	if len(conf.JwtPublicKey) > 0 {

cc-metric-store.go

@@ -277,7 +277,7 @@ func main() {
 		for {
 			sig := <-sigs
 			if sig == syscall.SIGUSR1 {
-				memoryStore.DebugDump(bufio.NewWriter(os.Stdout))
+				memoryStore.DebugDump(bufio.NewWriter(os.Stdout), nil)
 				continue
 			}
 

debug.go

@@ -3,48 +3,105 @@ package main
 import (
 	"bufio"
 	"fmt"
+	"strconv"
 )
 
-func (b *buffer) debugDump(w *bufio.Writer) {
+func (b *buffer) debugDump(buf []byte) []byte {
 	if b.prev != nil {
-		b.prev.debugDump(w)
+		buf = b.prev.debugDump(buf)
 	}
 
-	end := ""
+	start, len, end := b.start, len(b.data), b.start+b.frequency*int64(len(b.data))
+	buf = append(buf, `{"start":`...)
+	buf = strconv.AppendInt(buf, start, 10)
+	buf = append(buf, `,"len":`...)
+	buf = strconv.AppendInt(buf, int64(len), 10)
+	buf = append(buf, `,"end":`...)
+	buf = strconv.AppendInt(buf, end, 10)
+	if b.archived {
+		buf = append(buf, `,"saved":true`...)
+	}
 	if b.next != nil {
-		end = " -> "
+		buf = append(buf, `},`...)
+	} else {
+		buf = append(buf, `}`...)
+	}
+	return buf
 }
 
-	to := b.start + b.frequency*int64(len(b.data))
-	fmt.Fprintf(w, "buffer(from=%d, len=%d, to=%d, archived=%v)%s", b.start, len(b.data), to, b.archived, end)
-}
-
-func (l *level) debugDump(w *bufio.Writer, m *MemoryStore, indent string) error {
+func (l *level) debugDump(m *MemoryStore, w *bufio.Writer, lvlname string, buf []byte, depth int) ([]byte, error) {
 	l.lock.RLock()
 	defer l.lock.RUnlock()
+	for i := 0; i < depth; i++ {
+		buf = append(buf, '\t')
+	}
+	buf = append(buf, '"')
+	buf = append(buf, lvlname...)
+	buf = append(buf, "\":{\n"...)
+	depth += 1
+	objitems := 0
+	for name, mc := range m.metrics {
+		if b := l.metrics[mc.offset]; b != nil {
+			for i := 0; i < depth; i++ {
+				buf = append(buf, '\t')
+			}
 
-	for name, minfo := range m.metrics {
-		b := l.metrics[minfo.offset]
-		if b != nil {
-			fmt.Fprintf(w, "%smetric '%s': ", indent, name)
-			b.debugDump(w)
-			fmt.Fprint(w, "\n")
+			buf = append(buf, '"')
+			buf = append(buf, name...)
+			buf = append(buf, `":[`...)
+			buf = b.debugDump(buf)
+			buf = append(buf, "],\n"...)
+			objitems++
 		}
 	}
 
-	if l.children != nil && len(l.children) > 0 {
-		fmt.Fprintf(w, "%schildren:\n", indent)
 	for name, lvl := range l.children {
-			fmt.Fprintf(w, "%s'%s':\n", indent, name)
-			lvl.debugDump(w, m, "\t"+indent)
-		}
+		_, err := w.Write(buf)
+		if err != nil {
+			return nil, err
 		}
 
-	return nil
+		buf = buf[0:0]
+		buf, err = lvl.debugDump(m, w, name, buf, depth)
+		if err != nil {
+			return nil, err
+		}
+
+		buf = append(buf, ',', '\n')
+		objitems++
+	}
+
+	// remove final `,`:
+	if objitems > 0 {
+		buf = append(buf[0:len(buf)-1], '\n')
+	}
+
+	depth -= 1
+	for i := 0; i < depth; i++ {
+		buf = append(buf, '\t')
+	}
+	buf = append(buf, '}')
+	return buf, nil
+}
+
+func (m *MemoryStore) DebugDump(w *bufio.Writer, selector []string) error {
+	lvl := m.root.findLevel(selector)
+	if lvl == nil {
+		return fmt.Errorf("not found: %#v", selector)
+	}
+
+	buf := make([]byte, 0, 2048)
+	buf = append(buf, "{"...)
+
+	buf, err := lvl.debugDump(m, w, "data", buf, 0)
+	if err != nil {
+		return err
+	}
+
+	buf = append(buf, "}\n"...)
+	if _, err = w.Write(buf); err != nil {
+		return err
 	}
 
-func (m *MemoryStore) DebugDump(w *bufio.Writer) error {
-	fmt.Fprintf(w, "MemoryStore (%d MB):\n", m.SizeInBytes()/1024/1024)
-	m.root.debugDump(w, m, "  ")
 	return w.Flush()
 }

float.go

@@ -23,7 +23,7 @@ func (f Float) MarshalJSON() ([]byte, error) {
 		return nullAsBytes, nil
 	}
 
-	return strconv.AppendFloat(make([]byte, 0, 10), float64(f), 'f', -1, 64), nil
+	return strconv.AppendFloat(make([]byte, 0, 10), float64(f), 'f', 3, 64), nil
 }
 
 func (f *Float) UnmarshalJSON(input []byte) error {
@@ -54,7 +54,7 @@ func (fa FloatArray) MarshalJSON() ([]byte, error) {
 		if fa[i].IsNaN() {
 			buf = append(buf, `null`...)
 		} else {
-			buf = strconv.AppendFloat(buf, float64(fa[i]), 'f', -1, 64)
+			buf = strconv.AppendFloat(buf, float64(fa[i]), 'f', 3, 64)
 
 		}
 	}

lineprotocol.go

@@ -295,6 +295,8 @@ func decodeLine(dec *lineprotocol.Decoder, clusterDefault string) error {
 				metric.Value = Float(val.FloatV())
 			} else if val.Kind() == lineprotocol.Int {
 				metric.Value = Float(val.IntV())
+			} else if val.Kind() == lineprotocol.Uint {
+				metric.Value = Float(val.UintV())
 			} else {
 				return fmt.Errorf("unsupported value type in message: %s", val.Kind().String())
 			}

selector.go

@@ -50,6 +50,22 @@ func (se *SelectorElement) MarshalJSON() ([]byte, error) {
 
 type Selector []SelectorElement
 
+func (l *level) findLevel(selector []string) *level {
+	if len(selector) == 0 {
+		return l
+	}
+
+	l.lock.RLock()
+	defer l.lock.RUnlock()
+
+	lvl := l.children[selector[0]]
+	if lvl == nil {
+		return nil
+	}
+
+	return lvl.findLevel(selector[1:])
+}
+
 func (l *level) findBuffers(selector Selector, offset int, f func(b *buffer) error) error {
 	l.lock.RLock()
 	defer l.lock.RUnlock()