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|
package shared
import (
"reflect"
"runtime"
"strings"
"sync"
"github.com/sirupsen/logrus"
)
// JobFunc provides the function signature for the pool'ed functions
type JobFunc func() error
// Job defines the function to run
type Job struct {
ID string
Fn JobFunc
}
// JobResult defines the results from the function ran
type JobResult struct {
Job Job
Err error
}
// Pool defines the worker pool and queues
type Pool struct {
id string
wg *sync.WaitGroup
jobs chan Job
results chan JobResult
size int
capacity int
}
// NewPool creates and initializes a new Pool
func NewPool(id string, size int, capacity int) *Pool {
var wg sync.WaitGroup
// min for int...
s := size
if s > capacity {
s = capacity
}
return &Pool{
id,
&wg,
make(chan Job, capacity),
make(chan JobResult, capacity),
s,
capacity,
}
}
// Add Job to pool for parallel processing
func (p *Pool) Add(job Job) {
p.wg.Add(1)
p.jobs <- job
}
// Run the Job's in the pool, gather and return results
func (p *Pool) Run() ([]string, map[string]error, error) {
var (
ok = []string{}
failures = map[string]error{}
)
for w := 0; w < p.size; w++ {
w := w
go p.newWorker(w)
}
close(p.jobs)
p.wg.Wait()
close(p.results)
for r := range p.results {
if r.Err == nil {
ok = append(ok, r.Job.ID)
} else {
failures[r.Job.ID] = r.Err
}
}
if logrus.GetLevel() == logrus.DebugLevel {
for i, f := range failures {
logrus.Debugf("Pool[%s, %s: %s]", p.id, i, f.Error())
}
}
return ok, failures, nil
}
// newWorker creates new parallel workers to monitor jobs channel from Pool
func (p *Pool) newWorker(slot int) {
for job := range p.jobs {
err := job.Fn()
p.results <- JobResult{job, err}
if logrus.GetLevel() == logrus.DebugLevel {
n := strings.Split(runtime.FuncForPC(reflect.ValueOf(job.Fn).Pointer()).Name(), ".")
logrus.Debugf("Worker#%d finished job %s/%s (%v)", slot, n[2:], job.ID, err)
}
p.wg.Done()
}
}
// DefaultPoolSize provides the maximum number of parallel workers (int) as calculated by a basic
// heuristic. This can be overridden by the --max-workers primary switch to podman.
func DefaultPoolSize(name string) int {
numCpus := runtime.NumCPU()
switch name {
case "init":
fallthrough
case "kill":
fallthrough
case "pause":
fallthrough
case "rm":
fallthrough
case "unpause":
if numCpus <= 3 {
return numCpus * 3
}
return numCpus * 4
case "ps":
return 8
case "restart":
return numCpus * 2
case "stop":
if numCpus <= 2 {
return 4
} else {
return numCpus * 3
}
}
return 3
}
|
