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router.go
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router.go
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package main
import (
"errors"
"fmt"
"log"
"regexp"
"sort"
"strings"
"github.com/gowon-irc/go-gowon"
"github.com/imroc/req/v3"
)
const (
noCommandRoutedErrMsg = "no command could be routed"
)
type RouterCommand interface {
Send(in *gowon.Message) *gowon.Message
GetHelp() string
GetCommand() string
GetPriority() int
Match(string) bool
}
type HttpCommand struct {
Command string
Endpoint string
Regex string
Help string
Priority int
}
func (hc *HttpCommand) Send(in *gowon.Message) *gowon.Message {
var out gowon.Message
client := req.C()
resp, err := client.R().
SetBody(in).
SetSuccessResult(&out).
SetErrorResult(&out).
Post(hc.Endpoint + "/message")
if err != nil {
log.Println(err)
in.Msg = fmt.Sprintf("{red}Error: request to %s failed{clear}", in.Command)
return in
}
if !resp.IsSuccessState() {
log.Printf("Command %s returned an unsuccessful response: %s", in.Command, resp.Status)
msg := out.Msg
if msg == "" {
msg = fmt.Sprintf("{red}Command %s returned an unsuccessful response: %s{clear}", in.Command, resp.Status)
}
out.Msg = msg
return &out
}
return &out
}
func (hc *HttpCommand) GetHelp() string {
if hc.Help != "" {
return fmt.Sprintf("{cyan}%s{clear}: %s", hc.Command, hc.Help)
}
var msg gowon.Message
client := req.C()
resp, err := client.R().
SetSuccessResult(&msg).
Get(hc.Endpoint + "/help")
if err != nil {
log.Println(err)
return fmt.Sprintf("{cyan}%s{clear}: could not fetch help", hc.Command)
}
if !resp.IsSuccessState() {
log.Printf("Command %s returned an unsuccessful response: %s", hc.Command, resp.Status)
return fmt.Sprintf("{cyan}%s{clear}: no help found", hc.Command)
}
return fmt.Sprintf("{cyan}%s{clear}: %s", hc.Command, msg.Msg)
}
func (hc *HttpCommand) GetCommand() string {
return hc.Command
}
func (hc *HttpCommand) GetPriority() int {
return hc.Priority
}
func (hc *HttpCommand) Match(text string) bool {
if hc.Command == gowon.GetCommand(text) {
return true
}
if hc.Regex != "" {
re := regexp.MustCompile(hc.Regex)
return re.Match([]byte(text))
}
return false
}
type InternalCommand struct {
Command string
Help string
Priority int
f func(in *gowon.Message) string
}
func (ic *InternalCommand) Send(in *gowon.Message) (out *gowon.Message) {
msg := ic.f(in)
return &gowon.Message{
Module: ic.Command,
Msg: msg,
Nick: in.Nick,
Dest: in.Dest,
Command: ic.Command,
Args: in.Args,
}
}
func (ic *InternalCommand) GetHelp() string {
if ic.Help != "" {
return fmt.Sprintf("{cyan}%s{clear}: %s", ic.Command, ic.Help)
}
return fmt.Sprintf("{cyan}%s{clear}: no help found", ic.Command)
}
func (ic *InternalCommand) GetCommand() string {
return ic.Command
}
func (ic *InternalCommand) GetPriority() int {
return ic.Priority
}
func (ic *InternalCommand) Match(text string) bool {
return ic.Command == gowon.GetCommand(text)
}
type CommandRouter struct {
Commands []RouterCommand
}
func (cr *CommandRouter) Add(cmd *Command) {
new := &HttpCommand{
Command: cmd.Command,
Endpoint: cmd.Endpoint,
Regex: cmd.Regex,
Help: cmd.Help,
Priority: cmd.Priority,
}
cr.Commands = append(cr.Commands, new)
}
func (cr *CommandRouter) AddInternal(command, help string, f func(in *gowon.Message) string) {
new := &InternalCommand{
Command: command,
Help: help,
Priority: -99,
f: f,
}
cr.Commands = append(cr.Commands, new)
}
func (cr *CommandRouter) SortPriority() {
sort.Slice(cr.Commands, func(i, j int) bool {
return cr.Commands[i].GetPriority() < cr.Commands[j].GetPriority()
})
}
func (cr *CommandRouter) Names() []string {
out := []string{}
for _, c := range cr.Commands {
out = append(out, c.GetCommand())
}
sort.Slice(out, func(i, j int) bool {
return out[i] < out[j]
})
return out
}
func (cr *CommandRouter) Route(text string) (RouterCommand, error) {
for _, cmd := range cr.Commands {
if cmd.Match(text) {
return cmd, nil
}
}
return nil, errors.New(noCommandRoutedErrMsg)
}
func (cr *CommandRouter) Clear() {
cr.Commands = nil
}
func colourList(in []string) (out []string) {
out = []string{}
colours := []string{"green", "red", "blue", "orange", "magenta", "cyan", "yellow"}
cl := len(colours)
for n, i := range in {
c := colours[n%cl]
o := fmt.Sprintf("{%s}%s{clear}", c, i)
out = append(out, o)
}
return out
}
func createHelpCommandFunc(cr *CommandRouter) func(in *gowon.Message) string {
return func(in *gowon.Message) string {
if in.Args != "" {
cmd := strings.Fields(in.Args)[0]
command, err := cr.Route("." + cmd)
if err != nil {
return fmt.Sprintf("{cyan}%s{clear}: command not found", cmd)
}
return command.GetHelp()
}
return strings.Join(colourList(cr.Names()), ", ")
}
}