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// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package app
import (
"fmt"
"strconv"
"strings"
"time"
"github.com/mattermost/mattermost-server/mlog"
"github.com/mattermost/mattermost-server/model"
goi18n "github.com/nicksnyder/go-i18n/i18n"
)
var echoSem chan bool
type EchoProvider struct {
}
const (
CMD_ECHO = "echo"
)
func init() {
RegisterCommandProvider(&EchoProvider{})
}
func (me *EchoProvider) GetTrigger() string {
return CMD_ECHO
}
func (me *EchoProvider) GetCommand(a *App, T goi18n.TranslateFunc) *model.Command {
return &model.Command{
Trigger: CMD_ECHO,
AutoComplete: true,
AutoCompleteDesc: T("api.command_echo.desc"),
AutoCompleteHint: T("api.command_echo.hint"),
DisplayName: T("api.command_echo.name"),
}
}
func (me *EchoProvider) DoCommand(a *App, args *model.CommandArgs, message string) *model.CommandResponse {
if len(message) == 0 {
return &model.CommandResponse{Text: args.T("api.command_echo.message.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
}
maxThreads := 100
delay := 0
if endMsg := strings.LastIndex(message, "\""); string(message[0]) == "\"" && endMsg > 1 {
if checkDelay, err := strconv.Atoi(strings.Trim(message[endMsg:], " \"")); err == nil {
delay = checkDelay
}
message = message[1:endMsg]
} else if strings.Contains(message, " ") {
delayIdx := strings.LastIndex(message, " ")
delayStr := strings.Trim(message[delayIdx:], " ")
if checkDelay, err := strconv.Atoi(delayStr); err == nil {
delay = checkDelay
message = message[:delayIdx]
}
}
if delay > 10000 {
return &model.CommandResponse{Text: args.T("api.command_echo.delay.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
}
if echoSem == nil {
// We want one additional thread allowed so we never reach channel lockup
echoSem = make(chan bool, maxThreads+1)
}
if len(echoSem) >= maxThreads {
return &model.CommandResponse{Text: args.T("api.command_echo.high_volume.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
}
echoSem <- true
a.Go(func() {
defer func() { <-echoSem }()
post := &model.Post{}
post.ChannelId = args.ChannelId
post.RootId = args.RootId
post.ParentId = args.ParentId
post.Message = message
post.UserId = args.UserId
time.Sleep(time.Duration(delay) * time.Second)
if _, err := a.CreatePostMissingChannel(post, true); err != nil {
mlog.Error(fmt.Sprintf("Unable to create /echo post, err=%v", err))
}
})
return &model.CommandResponse{}
}
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