DFS

This is essentially InfluxData's TICKscript for Erlang. Done using leex and yecc.

Why ?

(I love Erlang and always wanted to try leex and yecc for a DSL.)

This DSL will be used along with dataflow to build an Analytics Framework on top of dataflow computations powered by erlang style message passing.

Status

Feature Complete, still more test to add

Features and Notable Differences from TICKscript

• For Declarations the keyword 'def' is used instead of 'var'

• Erlang-Style comments with '%'

• Regular Expressions start and end with '?'

• Built-In Functions (math, erlang and custom modules)

• every Declaration can be overridden (includes lists and lambdas) for template usage

Examples

Declaration (String Value)

def inId = '14.987ew349f9e87fwef'
def outId = '202.5dfgs555sa5df5a'
def dead_message = 'LOW on CARBONIDE !!!'

Declaration (others)

def func = lambda: "rate" / "count"
def funMax = lambda: max("v1", "v2")
def mylist = [1.22, 14.332, 45.5]

Declaration (Chain)

def in1 =
   |stream_in()
    .from(inId)

Use chain Declaration with another Chain Statement

in1
   |deadman(15m, 30)
    .as(dead_message)

Lambda Expressions Parameter

in1
  |eval(
    lambda: "value" * "value",
    lambda: 1/"value2")
  .as('value2', 'inv_value2')

in1
  |where(lambda: "host" == 'server001.example.com'))

Complex Lambda Expression with if Statement

def threshold = 333
def boolTrue = true
def boolFalse = false

def in12 =
    |eval(lambda: if(( "ts" > (max(threshold,23.55) + 2)), boolTrue, boolFalse) )
    .as('ts_greater')

Long Chain Statement with multiple Nodes

|window()
 .every(15s)
 .period(30m)
 .stats(mean, difference)
 .field('val')
 .as('mean', 'diff')
 % write to outstream
 |stream_out(outId)
  .translate(lambda: 5 > "mean")
 |alert()
  .critical(
        % alert when point value is more than 3 stdvs away
        % from running mean
    lambda: sigma("value") > 3, _global
 )
        % alert only when point's timestamp is between these boundaries
  .when(lambda: hour() >= 8 AND hour <= 18)

Erlang

24|25

Compile

rebar3 compile

Build (Lexer, Parser), Run, Test

$ make

License

Apache2