Is there any Rules Engine/Inference Engine for Go

Question

We want to implement our business logic using Go, but we cannot find any good implementation of rules engine/inference engine for Go. Does anyone have any experience or suggestions?

Did you find any good soliton or framework around this topic? @rui — Mikheil Janiashvili, Sep 01 '23 at 17:26

score 3 · Answer 1 · answered May 08 '14 at 21:08

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There is a project that aims to implement an ISO Prolog compiler in Go:

GoLog.

I haven't tested it, but given that it implements some basic Prolog, that should be quite a capable rule-based reasoning engine, AFAIS.

Otherwise, a search for "rule" over at godoc.org also yields a bunch of packages:

godoc.org/?q=rule

answered May 08 '14 at 21:08

Samuel Lampa

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Looking at the list over at godoc.org, godec (https://github.com/steveyen/gdec) seems to be potentially interesting , claiming to be "declarative golang data & rules processing". – Samuel Lampa May 08 '14 at 21:18

score 1 · Answer 2 · answered Apr 15 '13 at 13:48

1

The best example of something like this to my knowledge is the 'table-driven' approach to unit tests taken in much of the standard library. For example, the fmttests.

Beyond that, Go is a powerful, expressive language. What do you actually need? There are a number of examples of state machine implementations in Go, and a number of web frameworks with declarative JSON configuration.

If you mean proper logic programming, there's no popular Go library for it yet.

answered Apr 15 '13 at 13:48

Cera

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It is not for testing purpose, we just need a temptable framework to handle boolean evaluation from a rule description file instead of hard code the logic in the code. – rui Jun 26 '13 at 22:16

score 1 · Answer 3 · answered Aug 13 '19 at 09:12

1

If you're familiar with JBoss Drools, now there's something similar in Golang. Check this out https://github.com/newm4n/grool

It has DSL similar to Drools DRL, called GRL.

rule SlowDown "When testcar is slowing down we keep decreasing the speed." salience 10  {
    when
        TestCar.SpeedUp == false && TestCar.Speed > 0
    then
        TestCar.Speed = TestCar.Speed - TestCar.SpeedIncrement;
        DistanceRecord.TotalDistance = DistanceRecord.TotalDistance + TestCar.Speed;
}

answered Aug 13 '19 at 09:12

Ferdinand Neman

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How to write the rule for "Contains" operator in GRL ? Rest I went through your grool repo and liked what you have done. – Kartavya Ramnani Nov 24 '19 at 10:13
@Kartavya You can easily create any function inside a struct and add the struct instance into the data context. Call the function from GRL. – Ferdinand Neman Dec 24 '19 at 22:27
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This project is now archived. Moved to https://github.com/hyperjumptech/grule-rule-engine – Ferdinand Neman Jul 16 '20 at 05:03

score 0 · Answer 4 · answered Aug 10 '18 at 11:05

Take a look at https://github.com/antonmedv/expr

It can parse next expressions:

# Get the special price if
user.Group in ["good_customers", "collaborator"]

# Promote article to the homepage when
len(article.Comments) > 100 and article.Category not in ["misc"]

# Send an alert when
product.Stock < 15

Type check them and evaluate.

Also code really good:

Is there any Rules Engine/Inference Engine for Go

4 Answers4