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110 lines
3 KiB
Go
110 lines
3 KiB
Go
// NB:
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// When adding new constants for the Method or CommandOrEvent
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// types, make sure to also add them to the map
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// <Method/CommandOrEvent>Available since the this will be used
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// to check if the message values are valid later on.
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package steward
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import (
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"fmt"
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"log"
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"os/exec"
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)
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// ------------------------------------------------------------
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// Method is used to specify the actual function/method that
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// is represented in a typed manner.
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type Method string
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func (m Method) GetMethodsAvailable() MethodsAvailable {
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ma := MethodsAvailable{
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topics: map[Method]methodHandler{
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ShellCommand: methodCommandShellCommand{},
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TextLogging: methodEventTextLogging{},
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SayHello: methodEventSayHello{},
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},
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}
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return ma
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}
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const (
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// Shell command to be executed via f.ex. bash
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ShellCommand Method = "shellCommand"
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// Send text logging to some host
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TextLogging Method = "textLogging"
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// Send Hello I'm here message
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SayHello Method = "sayHello"
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)
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type MethodsAvailable struct {
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topics map[Method]methodHandler
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}
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// Check if exists will check if the Method is defined. If true the bool
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// value will be set to true, and the methodHandler function for that type
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// will be returned.
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func (ma MethodsAvailable) CheckIfExists(m Method) (methodHandler, bool) {
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mFunc, ok := ma.topics[m]
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if ok {
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// fmt.Printf("******THE TOPIC EXISTS: %v******\n", m)
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return mFunc, true
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} else {
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// fmt.Printf("******THE TOPIC DO NOT EXIST: %v******\n", m)
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return nil, false
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}
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}
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// ------------------------------------------------------------
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// Subscriber method handlers
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// ------------------------------------------------------------
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type methodHandler interface {
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handler(server *server, message Message, node string) ([]byte, error)
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}
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type methodCommandShellCommand struct{}
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func (m methodCommandShellCommand) handler(s *server, message Message, node string) ([]byte, error) {
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// Since the command to execute is at the first position in the
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// slice we need to slice it out. The arguments are at the
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// remaining positions.
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c := message.Data[0]
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a := message.Data[1:]
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cmd := exec.Command(c, a...)
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//cmd.Stdout = os.Stdout
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out, err := cmd.CombinedOutput()
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if err != nil {
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log.Printf("error: execution of command failed: %v\n", err)
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}
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outMsg := []byte(fmt.Sprintf("confirmed from node: %v: messageID: %v\n---\n%s---", node, message.ID, out))
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return outMsg, nil
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}
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// -----
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type methodEventTextLogging struct{}
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func (m methodEventTextLogging) handler(s *server, message Message, node string) ([]byte, error) {
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for _, d := range message.Data {
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s.logCh <- []byte(d)
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}
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outMsg := []byte("confirmed from: " + node + ": " + fmt.Sprint(message.ID))
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return outMsg, nil
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}
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// -----
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type methodEventSayHello struct{}
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func (m methodEventSayHello) handler(s *server, message Message, node string) ([]byte, error) {
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log.Printf("################## Received hello from %v ##################\n", message.FromNode)
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s.metrics.helloNodes[message.FromNode] = struct{}{}
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outMsg := []byte("confirmed from: " + node + ": " + fmt.Sprint(message.ID))
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return outMsg, nil
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}
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