Exemplo n.º 1
0
// call by  ioWorker
func ioRrdFetch(filename string, cf string, start, end int64,
	step int) ([]*specs.RRDData, error) {
	start_t := time.Unix(start, 0)
	end_t := time.Unix(end, 0)
	step_t := time.Duration(step) * time.Second

	statInc(ST_RRD_FETCH, 1)
	fetchRes, err := rrdlite.Fetch(filename, cf, start_t, end_t, step_t)
	if err != nil {
		statInc(ST_RRD_FETCH_ERR, 1)
		return []*specs.RRDData{}, err
	}

	defer fetchRes.FreeValues()

	values := fetchRes.Values()
	size := len(values)
	ret := make([]*specs.RRDData, size)

	start_ts := fetchRes.Start.Unix()
	step_s := fetchRes.Step.Seconds()

	for i, val := range values {
		ts := start_ts + int64(i+1)*int64(step_s)
		d := &specs.RRDData{
			Ts: ts,
			V:  specs.JsonFloat(val),
		}
		ret[i] = d
	}
	if err != nil {
		err = fmt.Errorf("filename:%s %s", filename, err)
	}
	return ret, nil
}
Exemplo n.º 2
0
// 非法值: ts=0,value无意义
func (p *Backend) getLast(csum string) *specs.RRDData {
	nan := &specs.RRDData{Ts: 0, V: specs.JsonFloat(0.0)}

	e := p.cache.get(csum)
	if e == nil {
		return nan
	}

	e.RLock()
	defer e.RUnlock()

	typ := e.typ()
	if typ == specs.GAUGE {
		if e.e.dataId == 0 {
			return nan
		}

		idx := uint32(e.e.dataId-1) & CACHE_SIZE_MASK
		return &specs.RRDData{
			Ts: int64(e.e.time[idx]),
			V:  specs.JsonFloat(e.e.value[idx]),
		}
	}

	if typ == specs.COUNTER || typ == specs.DERIVE {

		if e.e.dataId < 2 {
			return nan
		}

		data, _ := e._getData(uint32(e.e.dataId)-2, uint32(e.e.dataId))

		delta_ts := data[0].Ts - data[1].Ts
		delta_v := data[0].V - data[1].V
		if delta_ts != int64(e.e.step) || delta_ts <= 0 {
			return nan
		}
		if delta_v < 0 {
			// when cnt restarted, new cnt value would be zero, so fix it here
			delta_v = 0
		}

		return &specs.RRDData{Ts: data[0].Ts,
			V: specs.JsonFloat(float64(delta_v) / float64(delta_ts))}
	}
	return nan
}
Exemplo n.º 3
0
func (p *Backend) getLastRaw(csum string) *specs.RRDData {
	nan := &specs.RRDData{Ts: 0, V: specs.JsonFloat(0.0)}
	e := p.cache.get(csum)
	if e == nil {
		return nan
	}

	e.RLock()
	defer e.RUnlock()

	if e.typ() == specs.GAUGE {
		if e.e.dataId == 0 {
			return nan
		}
		idx := uint32(e.e.dataId-1) & CACHE_SIZE_MASK
		return &specs.RRDData{
			Ts: int64(e.e.time[idx]),
			V:  specs.JsonFloat(e.e.value[idx]),
		}
	}
	return nan
}
Exemplo n.º 4
0
/*
 * a older than b
 * c = a <- b
 */
func queryMergeData(a, b []*specs.RRDData, start,
	end, step int64) []*specs.RRDData {

	// do merging
	c := make([]*specs.RRDData, 0)
	if len(a) > 0 {
		for _, v := range a {
			if v.Ts >= start &&
				v.Ts <= end {
				//rrdtool返回的数据,时间戳是连续的、不会有跳点的情况
				c = append(c, v)
			}
		}
	}

	bl := len(b)
	if bl > 0 {
		cl := len(c)
		lastTs := b[0].Ts

		// find junction
		i := 0
		for i = cl - 1; i >= 0; i-- {
			if c[i].Ts < b[0].Ts {
				lastTs = c[i].Ts
				break
			}
		}

		// fix missing
		for ts := lastTs + step; ts < b[0].Ts; ts += step {
			c = append(c, &specs.RRDData{Ts: ts,
				V: specs.JsonFloat(math.NaN())})
		}

		// merge cached items to result
		i += 1
		for j := 0; j < bl; j++ {
			if i < cl {
				if !math.IsNaN(float64(b[j].V)) {
					c[i] = b[j]
				}
			} else {
				c = append(c, b[j])
			}
			i++
		}
	}
	return c
}
Exemplo n.º 5
0
func queryPruneCache(items []*specs.RRDData, e *cacheEntry,
	start, end int64) (ret []*specs.RRDData) {

	// prune cached items
	var val specs.JsonFloat

	ts := items[0].Ts
	n := len(items)

	last := items[n-1].Ts
	i := 0
	typ := e.typ()
	if typ == specs.DERIVE || typ == specs.COUNTER {
		for ts < last {
			if i < n-1 && ts == items[i].Ts &&
				ts == items[i+1].Ts-int64(e.e.step) {
				val = specs.JsonFloat(items[i+1].V-
					items[i].V) / specs.JsonFloat(e.e.step)
				if val < 0 {
					val = specs.JsonFloat(math.NaN())
				}
				i++
			} else {
				// missing
				val = specs.JsonFloat(math.NaN())
			}

			if ts >= start && ts <= end {
				ret = append(ret,
					&specs.RRDData{Ts: ts, V: val})
			}
			ts = ts + int64(e.e.step)
		}
	} else if typ == specs.GAUGE {
		for ts <= last {
			if i < n && ts == items[i].Ts {
				val = specs.JsonFloat(items[i].V)
				i++
			} else {
				// missing
				val = specs.JsonFloat(math.NaN())
			}

			if ts >= start && ts <= end {
				ret = append(ret,
					&specs.RRDData{Ts: ts, V: val})
			}
			ts = ts + int64(e.e.step)
		}
	}
	return ret
}
Exemplo n.º 6
0
func queryPruneRet(a []*specs.RRDData,
	start, end, step int64) []*specs.RRDData {

	// prune result
	n := int((end - start) / step)
	ret := make([]*specs.RRDData, n)
	j := 0
	ts := start
	al := len(a)

	for i := 0; i < n; i++ {
		if j < al && ts == a[j].Ts {
			ret[i] = a[j]
			j++
		} else {
			ret[i] = &specs.RRDData{Ts: ts,
				V: specs.JsonFloat(math.NaN())}
		}
		ts += step
	}
	return ret
}
Exemplo n.º 7
0
Arquivo: cache.go Projeto: yubo/falcon
// return [l, h)
// h - l <= CACHE_SIZE
func (p *cacheEntry) _getData(l, h uint32) (ret []*specs.RRDData,
	overrun int) {

	size := h - l
	if size > CACHE_SIZE {
		overrun = int(size - CACHE_SIZE)
		size = CACHE_SIZE
		l = h - CACHE_SIZE
	}

	if size == 0 {
		return
	}

	ret = make([]*specs.RRDData, size)

	//H := h & CACHE_SIZE_MASK
	L := l & CACHE_SIZE_MASK

	for i := uint32(0); i < size; i++ {
		idx := (L + i) & CACHE_SIZE_MASK
		ret[i] = &specs.RRDData{
			Ts: int64(p.e.time[idx]),
			V:  specs.JsonFloat(p.e.value[idx]),
		}
	}
	/*
		if H > L {
			copy(ret, p.data[L:H])
		} else {
			copy(ret[:CACHE_SIZE-L], p.data[L:])
			copy(ret[CACHE_SIZE-L:], p.data[:H])
		}
	*/
	return
}