rrd

package module
v0.0.3 Latest Latest
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 Go to latest Published: Feb 26, 2020 License: BSD-3-Clause Imports: 11 Imported by: 17

README

Go bindings to rrdtool C library (rrdtool)

This package implements Go (golang) bindings for the rrdtool C API.

Installing

rrd currently supports rrdtool-1.4.x

Install rrd with:

go get github.com/ziutek/rrd

Usage

See GoDoc for documentation.

Example

See rrd_test.go for an example of using this package.

Documentation

Overview

Simple wrapper for rrdtool C library

Index

Examples

Constants

This section is empty.

Variables

This section is empty.

Functions

func Info 

func Info(filename string) (map[string]interface{}, error)

Info returns information about RRD file.

Types

type Creator 

type Creator struct {
	// contains filtered or unexported fields
}

func NewCreator 

func NewCreator(filename string, start time.Time, step uint) *Creator

NewCreator returns new Creator object. You need to call Create to really create database file. 

filename - name of database file
start    - don't accept any data timed before or at time specified
step     - base interval in seconds with which data will be fed into RRD

func (*Creator) Create 

func (c *Creator) Create(overwrite bool) error

Create creates new database file. If overwrite is true it overwrites database file if exists. If overwrite is false it returns error if file exists (you can use os.IsExist function to check this case).

func (*Creator) DS 

func (c *Creator) DS(name, compute string, args ...interface{})

DS formats a DS argument and appends it to the list of arguments to be passed to rrdcreate(). Each element of args is formatted with fmt.Sprint(). Please see the rrdcreate(1) manual page for in-depth documentation.

Example 
c := &Creator{}

// Add a normal data source, i.e. one of GAUGE, COUNTER, DERIVE and ABSOLUTE:
c.DS("regular_ds", "DERIVE",
	900, /* heartbeat */
	0,   /* min */
	"U" /* max */)

// Add a computed
c.DS("computed_ds", "COMPUTE",
	"regular_ds,8,*" /* RPN expression */)

Output:

func (*Creator) RRA 

func (c *Creator) RRA(cf string, args ...interface{})

RRA formats an RRA argument and appends it to the list of arguments to be passed to rrdcreate(). Each element of args is formatted with fmt.Sprint(). Please see the rrdcreate(1) manual page for in-depth documentation.

Example 
c := &Creator{}

// Add a normal consolidation function, i.e. one of MIN, MAX, AVERAGE and LAST:
c.RRA("AVERAGE",
	0.3, /* xff */
	5,   /* steps */
	1200 /* rows */)

// Add aberrant behavior detection:
c.RRA("HWPREDICT",
	1200, /* rows */
	0.4,  /* alpha */
	0.5,  /* beta */
	288 /* seasonal period */)

Output:

type Error 

type Error string

func (Error) Error 

func (e Error) Error() string

type Exporter 

type Exporter struct {
	// contains filtered or unexported fields
}

func NewExporter 

func NewExporter() *Exporter

func (*Exporter) CDef 

func (e *Exporter) CDef(vname, rpn string)

func (*Exporter) Def 

func (e *Exporter) Def(vname, rrdfile, dsname, cf string, options ...string)

func (*Exporter) SetDaemon 

func (e *Exporter) SetDaemon(daemon string)

func (*Exporter) SetMaxRows 

func (e *Exporter) SetMaxRows(maxRows uint)

func (*Exporter) Xport 

func (e *Exporter) Xport(start, end time.Time, step time.Duration) (XportResult, error)

func (*Exporter) XportDef 

func (e *Exporter) XportDef(vname, label string)

type FetchResult 

type FetchResult struct {
	Filename string
	Cf       string
	Start    time.Time
	End      time.Time
	Step     time.Duration
	DsNames  []string
	RowCnt   int
	// contains filtered or unexported fields
}

func Fetch 

func Fetch(filename, cf string, start, end time.Time, step time.Duration) (FetchResult, error)

Fetch retrieves data from RRD file.

func (*FetchResult) FreeValues 

func (r *FetchResult) FreeValues()

FreeValues free values memory allocated by C.

func (*FetchResult) ValueAt 

func (r *FetchResult) ValueAt(dsIndex, rowIndex int) float64

func (*FetchResult) Values 

func (r *FetchResult) Values() []float64

Values returns copy of internal array of values.

type GraphInfo 

type GraphInfo struct {
	Print         []string
	Width, Height uint
	Ymin, Ymax    float64
}

type Grapher 

type Grapher struct {
	// contains filtered or unexported fields
}

func NewGrapher 

func NewGrapher() *Grapher

func (*Grapher) AddOptions 

func (g *Grapher) AddOptions(options ...string)

func (*Grapher) Area 

func (g *Grapher) Area(value, color string, options ...string)

func (*Grapher) CDef 

func (g *Grapher) CDef(vname, rpn string)

func (*Grapher) Comment 

func (g *Grapher) Comment(s string)

func (*Grapher) Def 

func (g *Grapher) Def(vname, rrdfile, dsname, cf string, options ...string)

func (*Grapher) GPrint 

func (g *Grapher) GPrint(vname, format string)

func (*Grapher) GPrintT 

func (g *Grapher) GPrintT(vname, format string)

func (*Grapher) Graph 

func (g *Grapher) Graph(start, end time.Time) (GraphInfo, []byte, error)

Graph returns GraphInfo and image as []byte or error

func (*Grapher) HRule 

func (g *Grapher) HRule(value, color string, options ...string)

func (*Grapher) Line 

func (g *Grapher) Line(width float32, value, color string, options ...string)

func (*Grapher) Print 

func (g *Grapher) Print(vname, format string)

func (*Grapher) PrintT 

func (g *Grapher) PrintT(vname, format string)

func (*Grapher) SaveGraph 

func (g *Grapher) SaveGraph(filename string, start, end time.Time) (GraphInfo, error)

SaveGraph saves image to file and returns GraphInfo or error

func (*Grapher) SetAltAutoscale 

func (g *Grapher) SetAltAutoscale()

func (*Grapher) SetAltAutoscaleMax 

func (g *Grapher) SetAltAutoscaleMax()

func (*Grapher) SetAltAutoscaleMin 

func (g *Grapher) SetAltAutoscaleMin()

func (*Grapher) SetBase 

func (g *Grapher) SetBase(base uint)

func (*Grapher) SetBorder 

func (g *Grapher) SetBorder(width uint)

func (*Grapher) SetColor 

func (g *Grapher) SetColor(colortag, color string)

func (*Grapher) SetDaemon 

func (g *Grapher) SetDaemon(daemon string)

func (*Grapher) SetImageFormat 

func (g *Grapher) SetImageFormat(format string)

func (*Grapher) SetInterlaced 

func (g *Grapher) SetInterlaced()

func (*Grapher) SetLazy 

func (g *Grapher) SetLazy()

func (*Grapher) SetLogarithmic 

func (g *Grapher) SetLogarithmic()

func (*Grapher) SetLowerLimit 

func (g *Grapher) SetLowerLimit(limit float64)

func (*Grapher) SetNoGridFit 

func (g *Grapher) SetNoGridFit()

func (*Grapher) SetNoLegend 

func (g *Grapher) SetNoLegend()

func (*Grapher) SetRightAxis 

func (g *Grapher) SetRightAxis(scale, shift float64)

func (*Grapher) SetRightAxisLabel 

func (g *Grapher) SetRightAxisLabel(label string)

func (*Grapher) SetRigid 

func (g *Grapher) SetRigid()

func (*Grapher) SetSize 

func (g *Grapher) SetSize(width, height uint)

func (*Grapher) SetSlopeMode 

func (g *Grapher) SetSlopeMode()

func (*Grapher) SetTitle 

func (g *Grapher) SetTitle(title string)

func (*Grapher) SetUnitsExponent 

func (g *Grapher) SetUnitsExponent(e int)

func (*Grapher) SetUnitsLength 

func (g *Grapher) SetUnitsLength(l uint)

func (*Grapher) SetUpperLimit 

func (g *Grapher) SetUpperLimit(limit float64)

func (*Grapher) SetVLabel 

func (g *Grapher) SetVLabel(vlabel string)

func (*Grapher) SetWatermark 

func (g *Grapher) SetWatermark(watermark string)

func (*Grapher) Shift 

func (g *Grapher) Shift(vname string, offset interface{})

func (*Grapher) TextAlign 

func (g *Grapher) TextAlign(align string)

func (*Grapher) Tick 

func (g *Grapher) Tick(vname, color string, options ...string)

func (*Grapher) VDef 

func (g *Grapher) VDef(vname, rpn string)

func (*Grapher) VRule 

func (g *Grapher) VRule(t interface{}, color string, options ...string)

type Updater 

type Updater struct {
	// contains filtered or unexported fields
}

func NewUpdater 

func NewUpdater(filename string) *Updater

func (*Updater) Cache 

func (u *Updater) Cache(args ...interface{})

Cache chaches data for later save using Update(). Use it to avoid open/read/write/close for every update.

func (*Updater) SetTemplate 

func (u *Updater) SetTemplate(dsName ...string)

func (*Updater) Update 

func (u *Updater) Update(args ...interface{}) error

Update saves data in RRDB. Without args Update saves all subsequent updates buffered by Cache method. If you specify args it saves them immediately.

type XportResult 

type XportResult struct {
	Start   time.Time
	End     time.Time
	Step    time.Duration
	Legends []string
	RowCnt  int
	// contains filtered or unexported fields
}

func (*XportResult) FreeValues 

func (r *XportResult) FreeValues()

FreeValues free values memory allocated by C.

func (*XportResult) ValueAt 

func (r *XportResult) ValueAt(legendIndex, rowIndex int) float64

Source Files

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