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plugin.go
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plugin.go
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package service
import (
"context"
"sync"
"github.com/roadrunner-server/errors"
"github.com/roadrunner-server/pool/state/process"
"go.uber.org/zap"
)
const PluginName string = "service"
type Plugin struct {
mu sync.Mutex
logger *zap.Logger
cfg Config
// all processes attached to the service
processes sync.Map // key -> []*Process
}
type Configurer interface {
// UnmarshalKey takes a single key and unmarshal it into a Struct.
UnmarshalKey(name string, out any) error
// Has checks if a config section exists.
Has(name string) bool
}
type Logger interface {
NamedLogger(name string) *zap.Logger
}
func (p *Plugin) Init(cfg Configurer, log Logger) error {
const op = errors.Op("service_plugin_init")
if !cfg.Has(PluginName) {
return errors.E(errors.Disabled)
}
err := cfg.UnmarshalKey(PluginName, &p.cfg.Services)
if err != nil {
return errors.E(op, err)
}
// init default parameters if not set by user
p.cfg.InitDefault()
// save the logger
p.logger = log.NamedLogger(PluginName)
return nil
}
func (p *Plugin) Serve() chan error {
errCh := make(chan error, 1)
// start processing
go func() {
// lock here, because Stop command might be invoked during the Serve
p.mu.Lock()
defer p.mu.Unlock()
for k := range p.cfg.Services {
// create needed number of the processes
procs := make([]*Process, p.cfg.Services[k].ProcessNum)
for i := 0; i < p.cfg.Services[k].ProcessNum; i++ {
// create processor structure, which will process all the services
procs[i] = NewServiceProcess(p.cfg.Services[k], k, p.logger)
}
// store all the processes idents
p.processes.Store(k, procs)
}
p.processes.Range(func(key, value any) bool {
procs := value.([]*Process)
for i := 0; i < len(procs); i++ {
cmdStr := procs[i].service.Command
err := procs[i].start()
if err != nil {
errCh <- err
return false
}
p.logger.Info("service was started", zap.String("name", key.(string)), zap.String("command", cmdStr))
}
return true
})
}()
return errCh
}
func (p *Plugin) Weight() uint {
return 10
}
func (p *Plugin) Reset() error {
p.processes.Range(func(key, value any) bool {
procs := value.([]*Process)
newProcs := make([]*Process, len(procs))
for i := 0; i < len(procs); i++ {
procs[i].stop()
p.processes.Delete(key)
service := &Service{}
*service = *(procs[i]).service
newProc := NewServiceProcess(service, key.(string), p.logger)
err := newProc.start()
if err != nil {
p.logger.Error("unable to start the service", zap.String("name", key.(string)))
return true
}
newProcs[i] = newProc
}
p.processes.Store(key, newProcs)
return true
})
return nil
}
func (p *Plugin) Workers() []*process.State {
p.mu.Lock()
defer p.mu.Unlock()
states := make([]*process.State, 0, 5)
p.processes.Range(func(key, value interface{}) bool {
k := key.(string)
procs := value.([]*Process)
for i := 0; i < len(procs); i++ {
st, err := generalProcessState(procs[i].pid, procs[i].command.String())
if err != nil {
p.logger.Error("get process state", zap.String("name", k), zap.String("command", procs[i].command.String()))
return true
}
states = append(states, st)
}
return true
})
return states
}
func (p *Plugin) Stop(context.Context) error {
p.processes.Range(func(key, value interface{}) bool {
k := key.(string)
procs := value.([]*Process)
for i := 0; i < len(procs); i++ {
procs[i].stop()
p.logger.Info("service was stopped", zap.String("name", k), zap.String("command", procs[i].service.Command))
p.processes.Delete(key)
}
return true
})
return nil
}
// Name contains service name.
func (p *Plugin) Name() string {
return PluginName
}
func (p *Plugin) RPC() any {
return &rpc{p: p}
}