decoupling start and shutdown

- start is no longer a blocking call
- giving it back to users
- the Stop method now waits for the timeout before closing

README.md

@@ -12,6 +12,8 @@ package main
 
 import (
 	"fmt"
+	"os"
+	"os/signal"
 	"strings"
 	"time"
 
@@ -43,7 +45,6 @@ things to demo functionality:
 
 func main() {
 	b, err := bolt.New()
-
 	if err != nil {
 		panic(err)
 	}
@@ -99,8 +100,16 @@ func main() {
 	if err != nil {
 		panic(err)
 	}
-}
 
+	qc := make(chan os.Signal, 1)
+	signal.Notify(qc, os.Interrupt)
+	<-qc
+
+	err = b.Stop()
+	if err != nil {
+		panic(err)
+	}
+}
 ```
 
 ## Development

bolt.go

@@ -5,7 +5,6 @@ import (
 	"fmt"
 	"log"
 	"os"
-	"os/signal"
 	"slices"
 	"strings"
 	"sync"
@@ -52,6 +51,8 @@ type Bolt struct {
 	maxRoutines int
 	//generic message handler func
 	msgHandlerf Payload
+	//command timeout when closing connection
+	grace time.Duration
 }
 
 // New creates a new bolt instance and applies any supplied options
@@ -73,6 +74,7 @@ func New(opts ...Option) (*Bolt, error) {
 		indicator:   DEFAULT_INDICATOR,
 		wg:          sync.WaitGroup{},
 		maxRoutines: DEFAULT_MAX_GOROUTINES,
+		grace:       time.Second * 5,
 	}
 
 	b.Identify.Intents = DEFAULT_INTENTS
@@ -87,22 +89,33 @@ func New(opts ...Option) (*Bolt, error) {
 }
 
 // Start applies the message event handler function to the bot and opens the initial websocket connection
-// with Discord. Start is a blocking call that also handles safe shutdown, on Interrupt, bolt will give
+// with Discord
-// command routines a window to finish before closing the connection.
 func (b *Bolt) Start() error {
 	b.AddHandler(b.msgEventHandler)
-	err := b.Open()
+	return b.Open()
-	if err != nil {
+}
-		return fmt.Errorf("failed to open websocket connection with Discord: %e", err)
+
+// AddCommands registers command handlers. Any messages that begin with the command indicator will be forwarded
+// to the handler
+func (b *Bolt) AddCommands(cmd ...Command) {
+	for _, c := range cmd {
+		//we can use a normal map here since writing only takes place once
+		b.commands[c.Trigger] = c
 	}
+}
 
-	sigChannel := make(chan os.Signal, 1)
+// AddMessageHandler registers the generic message handler, any messages that are not commands will be forwarded
-	signal.Notify(sigChannel, os.Interrupt)
+// to the handler
-	<-sigChannel
+func (b *Bolt) AddMessageHandler(p Payload) {
+	b.msgHandlerf = p
+}
 
-	//give handler routines a 5 second window to finish processes before closing connection
+// Stop waits for the alloted grace period timeout before handling safe shutdown of the
-	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
+// Discord connection
+func (b *Bolt) Stop() error {
+	ctx, cancel := context.WithTimeout(context.Background(), b.grace)
 	defer cancel()
+
 	closeChan := make(chan struct{})
 	go func() {
 		b.wg.Wait()
@@ -115,25 +128,6 @@ func (b *Bolt) Start() error {
 	case <-closeChan:
 	}
 
-	return b.stop()
-}
-
-// AddCommands registers command handlers. Any messages that begin with the command indicator will be forwarded
-// to the handler
-func (b *Bolt) AddCommands(cmd ...Command) {
-	for _, c := range cmd {
-		b.commands[c.Trigger] = c
-	}
-}
-
-// AddMessageHandler registers the generic message handler, any messages that are not commands will be forwarded
-// to the handler
-func (b *Bolt) AddMessageHandler(p Payload) {
-	b.msgHandlerf = p
-}
-
-// stop closes the websocket connection to Discord
-func (b *Bolt) stop() error {
 	return b.Close()
 }
 
@@ -258,7 +252,6 @@ func (b *Bolt) handleMessage(event *Message) error {
 // handleCommand maps the first word of the message to the command payload, if it exists. It then forwards the message
 // data to the handler after checking the timeout and role restrictions. If restrictions have not been met a generic
 // response is sent to the message
-// TODO: accept a string for timeout/role rejection messages to allow customization
 func (b *Bolt) handleCommand(msg *Message, lg int) error {
 	run, ok := b.commands[msg.Words[0][lg:]]
 	if !ok {
@@ -345,8 +338,6 @@ func (b *Bolt) remainingTimeout(timeout time.Time) string {
 	return fmt.Sprintf("%d%s", timeLeft, metric)
 }
 
-// checks if the author of msg has the correct role to run the requested command
-
 // roleCheck loops through the provided user role ID's grabs the role "name" and ensures the role is present
 // in the commands whitelist. If the role exists in the Command whitelist a true response is returned
 func (b *Bolt) roleCheck(guild string, roles []string, s *dg.Session, run Command) (bool, error) {

option.go

@@ -1,6 +1,8 @@
 package bolt
 
 import (
+	"time"
+
 	dg "github.com/bwmarrin/discordgo"
 )
 
@@ -48,3 +50,11 @@ func WithLogLevel(lvl LogLevel) Option {
 		b.logLvl = lvl
 	}
 }
+
+// WithGracePeriod gives a grace period for commands to finish prior to closing the
+// websocket connection with Discord
+func WithGracePeriod(t time.Duration) Option {
+	return func(b *Bolt) {
+		b.grace = t
+	}
+}