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Description

Easy worker setup for your code. Have some draught and let this repo manage your load using go routines.

Programming language: Go
License: MIT License
Tags: Workers     Goroutines     Queues     Concurrency     Worker Pool     Job Pool     Worker Model    
Latest version: v1.2

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README

Build Status Godocs Go Report Card Open Source Helpers Release

sworker

Easy worker setup for your code.
Have some draught and let this repo manage your load using go routines.
Checkout NSQ repo for msg queuing - drift

install

go get github.com/mayur-tolexo/sworker/draught

Benchmark

sworker draught is fast enough as compared to the other worker pools available. Screenshot 2019-06-12 at 1 04 34 AM

Features

Example 1

Basic print job using two workers.

//print : function which worker will call to execute
func print(ctx context.Context, value ...interface{}) error {
    fmt.Println(value)
    return nil
}

func main() {
    pool := draught.NewSimplePool(n) //new job pool created
    pool.AddWorker(2, print, true) //adding 2 workers
    for i := 0; i < 100; i++ {
        pool.AddJob(i) //adding jobs
    }
    pool.Close() //closing the job pool
}

Example 2

//print : function which worker will call to execute
func print(ctx context.Context, value ...interface{}) error {
    fmt.Println(value)
    time.Sleep(time.Duration(rand.Intn(10)) * time.Millisecond)
    return nil
}

type logger struct{}

//Print will implement draught.Logger interface
func (logger) Print(pool *draught.Pool, value []interface{}, err error) {
    fmt.Println(value, err)
}

//main function
func main() {
    rand.Seed(time.Now().UnixNano())
    handler := print                         //handler function which the go routine will call
    n := 10                                  //no of jobs
    pool := draught.NewPool(n, "", logger{}) //new job pool created
    pool.SetTag("PRINTER")                   //added tag to the pool
    pool.SetBatchProfiler(5)                 //added profiler batch size
    pool.SetConsoleLog(true)                 //enable console log
    pool.AddWorker(2, handler, true)         //adding 2 workers

    for i := 0; i < n; i++ {
        pool.AddJob(i) //adding jobs
    }
    pool.Close() //closing the job pool
    pool.Stats() //pool stats
}

Output

Screenshot 2019-06-07 at 11 57 29 AM

Handler

//Handler function which will be called by the go routine
type Handler func(context.Context, ...interface{}) error

Here print is a handler function.  
Define your own handler and pass it to the workers and you are ready to go.

Recovery

Each job contains it's own recovery.  
If any panic occured while processing the job  
then that panic will be logged and worker will continue doing next job.

Logger

There are two ways to set logger in the pool.

  • While creating the pool
  • Using SetLogger() method after pool creation
type Logger struct{}
//Implementing Logger interface
func (l Logger)Print(pool *Pool, value []interface{}, err error){
}

// While creating the pool
NewPool(size int, tag string, Logger{})

// Using SetLogger() method after pool creation
pool.SetLogger(Logger{})
Console log will enable pool error and close notification logging in console

Error Pool

pool.GetErrorPool()
This will return a channel of workerJob which contains error occured and job value.

Retries

pool.SetMaxRetry(2)
To set maximum number of retires to be done if error occured while processing the job.  
Default is 0. Retry won't work if panic occured while processing the job.

Set retry exponent base

pool.SetRetryExponent(2)
If error occured then that job will be delayed exponentially.  
Default exponent base is 10.

Pool Stats

pool.Stats()
Pool's complete status.

Total job count

pool.TotalCount()
Total job processed by the pool workers.

Success count

pool.SuccessCount()
Successfully processed jobs count

Error count

pool.ErrorCount()
Error count while processing job

Retry count

pool.RetryCount()
Retry count while processing job

Worker count

pool.WorkerCount()
No of Worker added on pool

Add job

for i := 1; i <= n; i++ {
    go pool.AddJob(i)
}
You can add job in go routines as it is thread safe.

Add worker

pool.AddWorker(2, handler, true)
You can add worker in go routines as well.

Set tag

pool.SetTag("PRINTER")
To uniquely identify the pool logs. 

Profiler

Batch profiler
pool.SetBatchProfiler(1000)
To log pool status after every specified batch of jobs complition.
Time profiler
pool.SetTimeProfiler(500 * time.Millisecond)
To log pool status after every specified time.  
If the pool worker got stuck at same process for more than  
thrice of the profiler time then it will log the worker current status.

Profiler Example

PRINTER: Processed:3 jobs(total:10 success:1 error:2 retry:2) in 0.00179143 SEC

Console Log

pool.SetConsoleLog(true)
Console log will enable pool error and close notification logging in console