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service.go
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service.go
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package service
import (
"github.com/cerana/cerana/acomm"
"github.com/cerana/cerana/pkg/errors"
"github.com/cerana/cerana/provider"
)
type continueCheck func(*acomm.Response) (bool, error)
// Provider is a provider of service management functionality.
type Provider struct {
config *Config
tracker *acomm.Tracker
}
// New creates a new instance of Provider.
func New(config *Config, tracker *acomm.Tracker) *Provider {
return &Provider{
config: config,
tracker: tracker,
}
}
// RegisterTasks registers all of the provider task handlers with the server.
func (p *Provider) RegisterTasks(server *provider.Server) {
server.RegisterTask("service-create", p.Create)
server.RegisterTask("service-get", p.Get)
server.RegisterTask("service-list", p.List)
server.RegisterTask("service-restart", p.Restart)
server.RegisterTask("service-remove", p.Remove)
}
func (p *Provider) executeRequests(requests []*acomm.Request, continueChecks []continueCheck) error {
if continueChecks == nil {
continueChecks = make([]continueCheck, len(requests))
}
for i, req := range requests {
doneChan := make(chan *acomm.Response, 1)
defer close(doneChan)
rh := func(req *acomm.Request, resp *acomm.Response) {
doneChan <- resp
}
req.SuccessHandler = rh
req.ErrorHandler = rh
if err := p.tracker.TrackRequest(req, p.config.RequestTimeout()); err != nil {
return err
}
if err := acomm.Send(p.config.CoordinatorURL(), req); err != nil {
return err
}
resp := <-doneChan
if resp.Error != nil {
return errors.ResetStack(resp.Error)
}
if check := continueChecks[i]; check != nil {
next, err := check(resp)
if err != nil {
return err
}
if !next {
return nil
}
}
}
return nil
}