expr

package
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 Go to latest Published: Sep 30, 2015 License: MIT Imports: 21 Imported by: 0

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Index

Constants

This section is empty.

Variables

View Source 
var ErrUnknownOp = fmt.Errorf("expr: unknown op type")
View Source 
var Graphite = map[string]parse.Func{
	"graphiteBand": {
		Args:   []parse.FuncType{parse.TypeString, parse.TypeString, parse.TypeString, parse.TypeString, parse.TypeScalar},
		Return: parse.TypeSeriesSet,
		Tags:   graphiteTagQuery,
		F:      GraphiteBand,
	},
	"graphite": {
		Args:   []parse.FuncType{parse.TypeString, parse.TypeString, parse.TypeString, parse.TypeString},
		Return: parse.TypeSeriesSet,
		Tags:   graphiteTagQuery,
		F:      GraphiteQuery,
	},
}

Graphite defines functions for use with a Graphite backend.

View Source 
var Influx = map[string]parse.Func{
	"influx": {
		Args:   []parse.FuncType{parse.TypeString, parse.TypeString, parse.TypeString, parse.TypeString, parse.TypeString},
		Return: parse.TypeSeriesSet,
		Tags:   influxTag,
		F:      InfluxQuery,
	},
}

Influx is a map of functions to query InfluxDB.

View Source 
var LogstashElastic = map[string]parse.Func{
	"lscount": {
		Args:   []parse.FuncType{parse.TypeString, parse.TypeString, parse.TypeString, parse.TypeString, parse.TypeString, parse.TypeString},
		Return: parse.TypeSeriesSet,
		Tags:   logstashTagQuery,
		F:      LSCount,
	},
	"lsstat": {
		Args:   []parse.FuncType{parse.TypeString, parse.TypeString, parse.TypeString, parse.TypeString, parse.TypeString, parse.TypeString, parse.TypeString, parse.TypeString},
		Return: parse.TypeSeriesSet,
		Tags:   logstashTagQuery,
		F:      LSStat,
	},
}

The following are specific functions that query an elastic instance populated by logstash. They are only loaded when the elastic hosts are set in the config file

View Source 
var TSDB = map[string]parse.Func{
	"band": {
		Args:   []parse.FuncType{parse.TypeString, parse.TypeString, parse.TypeString, parse.TypeScalar},
		Return: parse.TypeSeriesSet,
		Tags:   tagQuery,
		F:      Band,
	},
	"change": {
		Args:   []parse.FuncType{parse.TypeString, parse.TypeString, parse.TypeString},
		Return: parse.TypeNumberSet,
		Tags:   tagQuery,
		F:      Change,
	},
	"count": {
		Args:   []parse.FuncType{parse.TypeString, parse.TypeString, parse.TypeString},
		Return: parse.TypeScalar,
		F:      Count,
	},
	"q": {
		Args:   []parse.FuncType{parse.TypeString, parse.TypeString, parse.TypeString},
		Return: parse.TypeSeriesSet,
		Tags:   tagQuery,
		F:      Query,
	},
	"window": {
		Args:   []parse.FuncType{parse.TypeString, parse.TypeString, parse.TypeString, parse.TypeScalar, parse.TypeString},
		Return: parse.TypeSeriesSet,
		Tags:   tagQuery,
		F:      Window,
		Check:  windowCheck,
	},
}

TSDB defines functions for use with an OpenTSDB backend.

Functions

func ProcessLSKeys 

func ProcessLSKeys(keystring, filter string, filtered *elastic.FilteredQuery) ([]lsKeyMatch, error)

This creates the elastic filter porition of a query

Types

type AlertKey 

type AlertKey string

func NewAlertKey 

func NewAlertKey(name string, group opentsdb.TagSet) AlertKey

func ParseAlertKey 

func ParseAlertKey(a string) (ak AlertKey, err error)

func (AlertKey) Group 

func (a AlertKey) Group() opentsdb.TagSet

Group returns the tagset of this alert key. Will panic if a is not a valid AlertKey. OpenTSDB tag validation errors are ignored.

func (AlertKey) Name 

func (a AlertKey) Name() string

type AlertKeys 

type AlertKeys []AlertKey

func (AlertKeys) Len 

func (a AlertKeys) Len() int

func (AlertKeys) Less 

func (a AlertKeys) Less(i, j int) bool

func (AlertKeys) Swap 

func (a AlertKeys) Swap(i, j int)

type AlertStatusProvider 

type AlertStatusProvider interface {
	GetUnknownAndUnevaluatedAlertKeys(alertName string) (unknown, unevaluated []AlertKey)
}

Alert Status Provider is used to provide information about alert results. This facilitates alerts referencing other alerts, even when they go unknown or unevaluated.

type Computation 

type Computation struct {
	Text  string
	Value interface{}
}

type Computations 

type Computations []Computation

type Expr 

type Expr struct {
	*parse.Tree
}

func New 

func New(expr string, funcs ...map[string]parse.Func) (*Expr, error)

func (*Expr) Execute 

func (e *Expr) Execute(c opentsdb.Context, g graphite.Context, l LogstashElasticHosts, influxConfig client.Config, cache *cache.Cache, T miniprofiler.Timer, now time.Time, autods int, unjoinedOk bool, search *search.Search, squelched func(tags opentsdb.TagSet) bool, history AlertStatusProvider) (r *Results, queries []opentsdb.Request, err error)

Execute applies a parse expression to the specified OpenTSDB context, and returns one result per group. T may be nil to ignore timings.

func (*Expr) ExecuteState 

func (e *Expr) ExecuteState(s *State, T miniprofiler.Timer) (r *Results, queries []opentsdb.Request, err error)

func (*Expr) MarshalJSON 

func (e *Expr) MarshalJSON() ([]byte, error)

type LogstashElasticHosts 

type LogstashElasticHosts []string

This is an array of Logstash hosts and exists as a type for something to attach methods to. The elasticsearch library will use the listed to hosts to discover all of the hosts in the config

func (*LogstashElasticHosts) GenIndices 

func (e *LogstashElasticHosts) GenIndices(r *LogstashRequest) (string, error)

GenIndicies generates the indexes to hit based on the timeframe of the query. It assumes all

func (LogstashElasticHosts) InitClient 

func (e LogstashElasticHosts) InitClient() error

InitClient sets up the elastic client. If the client has already been initalized it is a noop

func (LogstashElasticHosts) Query 

func (e LogstashElasticHosts) Query(r *LogstashRequest) (*elastic.SearchResult, error)

Query takes a Logstash request, applies it a search service, and then queries elasticsearch.

type LogstashRequest 

type LogstashRequest struct {
	IndexRoot  string // The root of all index names i.e. logstash in logstash-2014-04-25
	Start      *time.Time
	End        *time.Time
	Source     *elastic.SearchSource // This the object that we build queries in
	KeyMatches []lsKeyMatch
}

LogstashRequest is a container for the information needed to query elasticsearch.

func LSBaseQuery 

func LSBaseQuery(now time.Time, indexRoot string, l LogstashElasticHosts, keystring string, filter, sduration, eduration string, size int) (*LogstashRequest, error)

LSBaseQuery builds the base query that both LSCount and LSStat share

func (*LogstashRequest) CacheKey 

func (r *LogstashRequest) CacheKey() string

CacheKey returns the text of the elastic query. That text is the indentifer for the query in the cache

type Number 

type Number float64

func (Number) MarshalJSON 

func (n Number) MarshalJSON() ([]byte, error)

func (Number) Type 

func (n Number) Type() parse.FuncType

func (Number) Value 

func (n Number) Value() interface{}

type Result 

type Result struct {
	Computations
	Value
	Group opentsdb.TagSet
}

type ResultSlice 

type ResultSlice []*Result

func (ResultSlice) DescByValue 

func (r ResultSlice) DescByValue() ResultSlice

func (ResultSlice) Filter 

func (r ResultSlice) Filter(filter opentsdb.TagSet) ResultSlice

Filter returns a slice with only the results that have a tagset that conforms to the given key/value pair restrictions

type ResultSliceByGroup 

type ResultSliceByGroup ResultSlice

func (ResultSliceByGroup) Len 

func (r ResultSliceByGroup) Len() int

func (ResultSliceByGroup) Less 

func (r ResultSliceByGroup) Less(i, j int) bool

func (ResultSliceByGroup) Swap 

func (r ResultSliceByGroup) Swap(i, j int)

type ResultSliceByValue 

type ResultSliceByValue ResultSlice

func (ResultSliceByValue) Len 

func (r ResultSliceByValue) Len() int

func (ResultSliceByValue) Less 

func (r ResultSliceByValue) Less(i, j int) bool

func (ResultSliceByValue) Swap 

func (r ResultSliceByValue) Swap(i, j int)

type Results 

type Results struct {
	Results ResultSlice
	// If true, ungrouped joins from this set will be ignored.
	IgnoreUnjoined bool
	// If true, ungrouped joins from the other set will be ignored.
	IgnoreOtherUnjoined bool
	// If non nil, will set any NaN value to it.
	NaNValue *float64
}

func Abs 

func Abs(e *State, T miniprofiler.Timer, series *Results) *Results

func Avg 

func Avg(e *State, T miniprofiler.Timer, series *Results) (*Results, error)

func Band 

func Band(e *State, T miniprofiler.Timer, query, duration, period string, num float64) (r *Results, err error)

func CCount 

func CCount(e *State, T miniprofiler.Timer, series *Results) (*Results, error)

func Change 

func Change(e *State, T miniprofiler.Timer, query, sduration, eduration string) (r *Results, err error)

func Count 

func Count(e *State, T miniprofiler.Timer, query, sduration, eduration string) (r *Results, err error)

func Des 

func Des(e *State, T miniprofiler.Timer, series *Results, alpha float64, beta float64) *Results

func Dev 

func Dev(e *State, T miniprofiler.Timer, series *Results) (*Results, error)

func Diff 

func Diff(e *State, T miniprofiler.Timer, series *Results) (r *Results, err error)

func DropG 

func DropG(e *State, T miniprofiler.Timer, series *Results, threshold *Results) (*Results, error)

func DropGe 

func DropGe(e *State, T miniprofiler.Timer, series *Results, threshold *Results) (*Results, error)

func DropL 

func DropL(e *State, T miniprofiler.Timer, series *Results, threshold *Results) (*Results, error)

func DropLe 

func DropLe(e *State, T miniprofiler.Timer, series *Results, threshold *Results) (*Results, error)

func DropNA 

func DropNA(e *State, T miniprofiler.Timer, series *Results) (*Results, error)

func DropValues 

func DropValues(e *State, T miniprofiler.Timer, series *Results, threshold *Results, dropFunction func(float64, float64) bool) (*Results, error)

func Duration 

func Duration(e *State, T miniprofiler.Timer, d string) (*Results, error)

func Epoch 

func Epoch(e *State, T miniprofiler.Timer) (*Results, error)

func Filter 

func Filter(e *State, T miniprofiler.Timer, series *Results, number *Results) (*Results, error)

func First 

func First(e *State, T miniprofiler.Timer, series *Results) (*Results, error)

func Forecast_lr 

func Forecast_lr(e *State, T miniprofiler.Timer, series *Results, y *Results) (r *Results, err error)

func GraphiteBand 

func GraphiteBand(e *State, T miniprofiler.Timer, query, duration, period, format string, num float64) (r *Results, err error)

func GraphiteQuery 

func GraphiteQuery(e *State, T miniprofiler.Timer, query string, sduration, eduration, format string) (r *Results, err error)

func InfluxQuery 

func InfluxQuery(e *State, T miniprofiler.Timer, db, query, startDuration, endDuration, groupByInterval string) (*Results, error)

func LSCount 

func LSCount(e *State, T miniprofiler.Timer, index_root, keystring, filter, interval, sduration, eduration string) (r *Results, err error)

LScount takes 6 arguments and returns the per second for matching documents. index_root is the root name of the index to hit, the format is expected to be fmt.Sprintf("%s-%s", index_root, d.Format("2006.01.02")). keystring creates groups (like tagsets) and can also filter those groups. It is the format of "field:regex,field:regex..." The :regex can be ommited. filter is an Elastic regexp query that can be applied to any field. It is in the same format as the keystring argument. interval is in the format of an opentsdb time duration, and tells elastic what the bucket size should be. The result will be normalized to a per second rate regardless of what this is set to. sduration and end duration are the time bounds for the query and are in opentsdb's relative time format: http://opentsdb.net/docs/build/html/user_guide/query/dates.html Caveats: 1) There is currently no escaping in the keystring, so if you regex needs to have a comma or double quote you are out of luck. 2) If the type of the field value in Elastic (aka the mapping) is a number then the regexes won't act as a regex. The only thing you can do is an exact match on the number, ie "eventlogid:1234". It is recommended that anything that is a identifer should be stored as a string since they are not numbers even if they are made up entirely of numerals.

func LSDateHistogram 

func LSDateHistogram(e *State, T miniprofiler.Timer, index_root, keystring, filter, interval, sduration, eduration, stat_field, rstat string, size int) (r *Results, err error)

LSDateHistorgram builds the aggregation query using subaggregations. The result is a grouped timer series that Bosun can understand

func LSStat 

func LSStat(e *State, T miniprofiler.Timer, index_root, keystring, filter, field, rstat, interval, sduration, eduration string) (r *Results, err error)

LSStat returns a bucketed statistical reduction for the specified field. The arguments are the same LSCount with the addition of the following: The field is the field to generate stats for - this must be a number type in elastic. rstat is the reduction function to use per bucket and can be one of the following: avg, min, max, sum, sum_of_squares, variance, std_deviation

func Last 

func Last(e *State, T miniprofiler.Timer, series *Results) (*Results, error)

func Length 

func Length(e *State, T miniprofiler.Timer, series *Results) (*Results, error)

func Limit 

func Limit(e *State, T miniprofiler.Timer, series *Results, v float64) (*Results, error)

func Max 

func Max(e *State, T miniprofiler.Timer, series *Results) (r *Results, err error)

func Median 

func Median(e *State, T miniprofiler.Timer, series *Results) (r *Results, err error)

func Min 

func Min(e *State, T miniprofiler.Timer, series *Results) (r *Results, err error)

func NV 

func NV(e *State, T miniprofiler.Timer, series *Results, v float64) (results *Results, err error)

func Percentile 

func Percentile(e *State, T miniprofiler.Timer, series *Results, p *Results) (r *Results, err error)

func Query 

func Query(e *State, T miniprofiler.Timer, query, sduration, eduration string) (r *Results, err error)

func Rename 

func Rename(e *State, T miniprofiler.Timer, series *Results, s string) (*Results, error)

func Since 

func Since(e *State, T miniprofiler.Timer, series *Results) (*Results, error)

func Sort 

func Sort(e *State, T miniprofiler.Timer, series *Results, order string) (*Results, error)

func Streak 

func Streak(e *State, T miniprofiler.Timer, series *Results) (*Results, error)

func Sum 

func Sum(e *State, T miniprofiler.Timer, series *Results) (*Results, error)

func Transpose 

func Transpose(e *State, T miniprofiler.Timer, d *Results, gp string) (*Results, error)

func Ungroup 

func Ungroup(e *State, T miniprofiler.Timer, d *Results) (*Results, error)

func Window 

func Window(e *State, T miniprofiler.Timer, query, duration, period string, num float64, rfunc string) (*Results, error)

func (*Results) NaN 

func (r *Results) NaN() Number

type Scalar 

type Scalar float64

func (Scalar) MarshalJSON 

func (s Scalar) MarshalJSON() ([]byte, error)

func (Scalar) Type 

func (s Scalar) Type() parse.FuncType

func (Scalar) Value 

func (s Scalar) Value() interface{}

type Series 

type Series map[time.Time]float64

Series is the standard form within bosun to represent timeseries data.

func (Series) MarshalJSON 

func (s Series) MarshalJSON() ([]byte, error)

func (Series) Type 

func (s Series) Type() parse.FuncType

func (Series) Value 

func (s Series) Value() interface{}

type SortablePoint 

type SortablePoint struct {
	T time.Time
	V float64
}

type SortableSeries 

type SortableSeries []SortablePoint

SortableSeries is an alternative datastructure for timeseries data, which stores points in a time-ordered fashion instead of a map. see discussion at https://github.com/bosun-monitor/bosun/pull/699

func NewSortedSeries 

func NewSortedSeries(dps Series) SortableSeries

func (SortableSeries) Len 

func (s SortableSeries) Len() int

func (SortableSeries) Less 

func (s SortableSeries) Less(i, j int) bool

func (SortableSeries) Swap 

func (s SortableSeries) Swap(i, j int)

type State 

type State struct {
	*Expr

	// OpenTSDB
	Search *search.Search

	// InfluxDB
	InfluxConfig client.Config

	History AlertStatusProvider
	// contains filtered or unexported fields
}

func (*State) AddComputation 

func (e *State) AddComputation(r *Result, text string, value interface{})

type Union 

type Union struct {
	Computations
	A, B  Value
	Group opentsdb.TagSet
}

func (*Union) ExtendComputations 

func (u *Union) ExtendComputations(o *Result)

type Value 

type Value interface {
	Type() parse.FuncType
	Value() interface{}
}

Source Files

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Directories

Path Synopsis
Package parse builds parse trees for expressions as defined by expr.
 Package parse builds parse trees for expressions as defined by expr.

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