/
ProcessContainer.go
218 lines (187 loc) · 5.41 KB
/
ProcessContainer.go
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package container
import (
"errors"
"fmt"
"os"
"os/signal"
"strings"
"syscall"
cconfig "github.com/pip-services3-go/pip-services3-commons-go/config"
cconv "github.com/pip-services3-go/pip-services3-commons-go/convert"
crefer "github.com/pip-services3-go/pip-services3-commons-go/refer"
"github.com/pip-services3-go/pip-services3-components-go/log"
)
/*
Inversion of control (IoC) container that runs as a system process. It processes command line arguments and handles unhandled exceptions and Ctrl-C signal to gracefully shutdown the container.
Command line arguments
--config / -c path to JSON or YAML file with container configuration (default: "./config/config.yml")
--param / --params / -p value(s) to parameterize the container configuration
--help / -h prints the container usage help
see
Container
Example
container = NewEmptyProcessContainer();
container.Container.AddFactory(NewMyComponentFactory());
container.Run(process.args);
*/
type ProcessContainer struct {
Container
configPath string
}
// Creates a new empty instance of the container.
// Returns ProcessContainer
func NewEmptyProcessContainer() *ProcessContainer {
c := &ProcessContainer{
Container: *NewEmptyContainer(),
configPath: "./config/config.yml",
}
c.SetLogger(log.NewConsoleLogger())
return c
}
// Creates a new instance of the container.
// Parameters:
// - name string
// a container name (accessible via ContextInfo)
// - description string
// a container description (accessible via ContextInfo)
// Returns ProcessContainer
func NewProcessContainer(name string, description string) *ProcessContainer {
c := &ProcessContainer{
Container: *NewContainer(name, description),
configPath: "./config/config.yml",
}
c.SetLogger(log.NewConsoleLogger())
return c
}
// Creates a new instance of the container inherit from reference.
// Parameters:
// - name string
// a container name (accessible via ContextInfo)
// - description string
// a container description (accessible via ContextInfo)
// - referenceable crefer.IReferenceable
// - referenceble object for inherit
// Returns *Container
func InheritProcessContainer(name string, description string,
referenceable crefer.IReferenceable) *ProcessContainer {
c := &ProcessContainer{
Container: *InheritContainer(name, description, referenceable),
configPath: "./config/config.yml",
}
c.SetLogger(log.NewConsoleLogger())
return c
}
// Set path for configuration file
func (c *ProcessContainer) SetConfigPath(configPath string) {
c.configPath = configPath
}
func (c *ProcessContainer) getConfigPath(args []string) string {
for index, arg := range args {
nextArg := ""
if index < len(args)-1 {
nextArg = args[index+1]
if strings.HasPrefix(nextArg, "-") {
nextArg = ""
}
}
if arg == "--config" || arg == "-c" {
return nextArg
}
}
return c.configPath
}
func (c *ProcessContainer) getParameters(args []string) *cconfig.ConfigParams {
line := ""
for index := 0; index < len(args); index++ {
arg := args[index]
nextArg := ""
if index < len(args)-1 {
nextArg = args[index+1]
if strings.HasPrefix(nextArg, "-") {
nextArg = ""
}
}
if nextArg != "" {
if arg == "--param" || arg == "--params" || arg == "-p" {
if line != "" {
line = line + ";"
}
line = line + nextArg
index++
}
}
}
parameters := cconfig.NewConfigParamsFromString(line)
for _, e := range os.Environ() {
env := strings.Split(e, "=")
parameters.SetAsObject(env[0], env[1])
}
return parameters
}
func (c *ProcessContainer) showHelp(args []string) bool {
for _, arg := range args {
if arg == "--help" || arg == "-h" {
return true
}
}
return false
}
func (c *ProcessContainer) printHelp() {
fmt.Println("Pip.Services process container - http://www.github.com/pip-services/pip-services")
fmt.Println("run [-h] [-c <config file>] [-p <param>=<value>]*")
}
func (c *ProcessContainer) captureErrors(correlationId string) {
if r := recover(); r != nil {
err, ok := r.(error)
if !ok {
msg := cconv.StringConverter.ToString(r)
err = errors.New(msg)
}
c.Logger().Fatal(correlationId, err, "Process is terminated")
os.Exit(1)
}
}
func (c *ProcessContainer) captureExit(correlationId string) {
c.Logger().Info(correlationId, "Press Control-C to stop the microservice...")
ch := make(chan os.Signal)
signal.Notify(ch, os.Interrupt, syscall.SIGINT, syscall.SIGTERM)
go func() {
select {
case <-ch:
c.Close(correlationId)
c.Logger().Info(correlationId, "Goodbye!")
os.Exit(0)
}
}()
}
// Runs the container by instantiating and running components inside the container.
// It reads the container configuration, creates, configures, references and opens components. On process exit it closes, unreferences and destroys components to gracefully shutdown.
// Parameters:
// - args []string
// command line arguments
func (c *ProcessContainer) Run(args []string) {
if c.showHelp(args) {
c.printHelp()
os.Exit(0)
return
}
correlationId := c.Info().Name
path := c.getConfigPath(args)
parameters := c.getParameters(args)
err := c.ReadConfigFromFile(correlationId, path, parameters)
if err != nil {
c.Logger().Fatal(correlationId, err, "Process is terminated")
os.Exit(1)
return
}
defer c.captureErrors(correlationId)
c.captureExit(correlationId)
err = c.Open(correlationId)
if err != nil {
c.Logger().Fatal(correlationId, err, "Process is terminated")
os.Exit(1)
return
}
ch := make(chan bool)
<-ch
}