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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
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How to Apply These Terms to Your New Programs
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Also add information on how to contact you by electronic and paper mail.
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The hypothetical commands `show w' and `show c' should show the appropriate
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The GNU General Public License does not permit incorporating your program
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Public License instead of this License. But first, please read
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# Hugot [![GoDoc](https://godoc.org/github.com/tcolgate/hugot?status.svg)](https://godoc.org/github.com/tcolgate/hugot)
WARNING: This code requires go1.7 context support in http.Request.
NOTE: The API is in flux at present.
Hugot is a package for building chat bots. It is inspired
by Go's http stdlib package.
Please see the [GoDoc](https://godoc.org/github.com/tcolgate/hugot) for examples and usage.

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// Copyright (c) 2016 Tristan Colgate-McFarlane
//
// This file is part of hugot.
//
// hugot is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// hugot is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with hugot. If not, see <http://www.gnu.org/licenses/>.
package hugot
import (
"context"
)
const adapterKey key = 0
// NewAdapterContext creates a context for passing an adapter. This is
// mainly used by web handlers.
func NewAdapterContext(ctx context.Context, a Adapter) context.Context {
return context.WithValue(ctx, adapterKey, a)
}
// AdapterFromContext returns the Adapter stored in a context.
func AdapterFromContext(ctx context.Context) (Adapter, bool) {
a, ok := ctx.Value(adapterKey).(Adapter)
return a, ok
}
// SenderFromContext can be used to retrieve a valid sender from
// a context. This is mostly useful in WebHook handlers for sneding
// messages back to the inbound Adapter.
func SenderFromContext(ctx context.Context) (Sender, bool) {
a, ok := ctx.Value(adapterKey).(Adapter)
return a, ok
}
// Receiver cam ne used to receive messages
type Receiver interface {
Receive() <-chan *Message // Receive returns a channel that can be used to read one message, nil indicated there will be no more messages
}
// Sender can be used to send messages
type Sender interface {
Send(ctx context.Context, m *Message)
}
// TextOnly is an interface to hint to handlers that the adapter
// they are talking to is a text only handler, to help adjust
// output.
type TextOnly interface {
Sender
IsTextOnly()
}
// IsTextOnly returns true if the sender only support text.
func IsTextOnly(s Sender) bool {
_, ok := s.(TextOnly)
return ok
}
// User represents a user within the chat sytems. The adapter is responsible
// for translating the string User to and from it's external representation
type User string
// Channel represents discussion channel, such as an IRC channel or
// Slack channel. The Adapter is responsible for translating between a human
// name for the channel, and any internal representation
type Channel string
// Adapter can be used to communicate with an external chat system such as
// slack or IRC.
type Adapter interface {
Sender
Receiver
}

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// Copyright (c) 2016 Tristan Colgate-McFarlane
//
// This file is part of hugot.
//
// hugot is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// hugot is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with hugot. If not, see <http://www.gnu.org/licenses/>.
// Package irc implements a simple adapter for IRC using
// github.com/fluffle/goirc/client
package irc
import (
"fmt"
"regexp"
"strings"
"sync"
"time"
"context"
"github.com/fluffle/goirc/client"
iglog "github.com/fluffle/goirc/logging/glog"
"github.com/golang/glog"
"github.com/tcolgate/hugot"
)
type irc struct {
cfg *client.Config
defChans []string
c chan *hugot.Message
start sync.Once
*client.Conn
}
// New creates a new adapter that communicates with an IRC server using
// github.com/thoj/go-ircevent
func New(c *client.Config, chans ...string) hugot.Adapter {
a := &irc{
c,
chans,
make(chan *hugot.Message),
sync.Once{},
nil,
}
return a
}
func (i *irc) Send(ctx context.Context, m *hugot.Message) {
i.Start()
if m.Private {
if m.Channel == "" {
if m.To != "" {
m.Channel = m.To
} else {
m.Channel = m.From
}
}
}
if glog.V(3) {
glog.Infof("Sending %#v", *m)
}
for _, l := range strings.Split(m.Text, "\n") {
i.Privmsg(m.Channel, l)
}
}
func (i *irc) Receive() <-chan *hugot.Message {
i.Start()
return i.c
}
func (i *irc) Start() {
i.start.Do(func() {
go i.run()
})
}
func (i *irc) run() {
iglog.Init()
for {
i.Conn = client.Client(i.cfg)
disconnected := make(chan struct{})
i.HandleFunc(client.DISCONNECTED, func(c *client.Conn, l *client.Line) {
if glog.V(1) {
glog.Info("IRC Disconnected")
}
close(disconnected)
})
// Connect to an IRC server.
if err := i.ConnectTo(i.cfg.Server); err != nil {
glog.Errorf("could not connect to server, %v", err)
<-time.After(5 * time.Second)
continue
}
i.HandleFunc(client.PRIVMSG, func(conn *client.Conn, l *client.Line) {
i.c <- i.eventToHugot(l)
})
i.HandleFunc(client.CONNECTED, func(conn *client.Conn, l *client.Line) {
if glog.V(1) {
glog.Info("IRC Connected")
}
for _, c := range i.defChans {
i.Join(c)
}
})
// Wait for disconnection.
<-disconnected
}
}
func (i *irc) eventToHugot(l *client.Line) *hugot.Message {
txt := l.Text()
nick := i.Me().Nick
tobot := false
priv := false
channel := l.Target()
if l.Public() {
// Check if the message was sent @bot, if so, set it as to us
// and strip the leading politeness
dir := regexp.MustCompile(fmt.Sprintf("^%s[:, ]+(.*)", nick))
dirMatch := dir.FindStringSubmatch(txt)
if glog.V(3) {
glog.Infof("Match %#v", dirMatch)
}
if len(dirMatch) > 1 {
tobot = true
txt = strings.Trim(dirMatch[1], " ")
}
} else {
tobot = true
priv = true
}
return &hugot.Message{
Channel: channel,
From: l.Nick,
To: nick,
Text: txt,
ToBot: tobot,
UserID: fmt.Sprintf("%s@%s", l.Ident, l.Host),
Private: priv,
}
}

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// Copyright (c) 2016 Tristan Colgate-McFarlane
//
// This file is part of hugot.
//
// hugot is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// hugot is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with hugot. If not, see <http://www.gnu.org/licenses/>.
package hugot
import "context"
// key is a our context key type
type key int
// ListenAndServe runs the handler h, passing all messages to/from
// the provided adapter. The context may be used to gracefully shut
// down the server.
func ListenAndServe(ctx context.Context, h Handler, a Adapter, as ...Adapter) {
if h == nil {
h = DefaultMux
}
ctx = NewAdapterContext(ctx, a)
Loop(ctx, h, a, as...)
}

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// Copyright (c) 2016 Tristan Colgate-McFarlane
//
// This file is part of hugot.
//
// hugot is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// hugot is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with hugot. If not, see <http://www.gnu.org/licenses/>.
// Package hugot provides a simple interface for building extensible
// chat bots in an idiomatic go style. It is heavily influenced by
// net/http, and uses an internal message format that is compatible
// with Slack messages.
//
// Note: This package requires go1.7
//
// Adapters
//
// Adapters are used to integrate with external chat systems. Currently
// the following adapters exist:
// slack - github.com/tcolgate/hugot/adapters/slack - for https://slack.com/
// irc - github.com/tcolgate/hugot/adapters/irc - simple irc adapter
// shell - github.com/tcolgate/hugot/adapters/shell - simple readline based adapter
//
// Examples of using these adapters can be found in github.com/tcolgate/hugot/cmd
//
// Handlers
//
// Handlers process messages. There are a several built in handler types:
//
// RawHandlers will execute for every message sent to them.
//
// HearsHandlers will execute for any message which matches a given regular
// expression. They are passed all string sub-matches from any capture groups.
//
// Command Handlers act on any direct message. Message are attempted to be
// processed as a command line. Quoted text is handle as a single argument. The
// passed message can be used as a flag.FlagSet
//
// Background handlers, are started when the bot is started. They do not
// receive messages but can send them. They are intended to implement long
// lived background tasks that react to external inputs.
//
// WebHook handlers can be used to implement web hooks by adding the bot to a
// http.ServeMux. A URL is build from the name of the handler.
//
// Mux
//
// The Mux will multiplex message across a set of handlers. In addition, a top
// level "help" Command handler is added to provide help on usage of the
// various handlers added to the Mux.
//
// WARNING: The API is still subject to change.
package hugot

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// Copyright (c) 2016 Tristan Colgate-McFarlane
//
// This file is part of hugot.
//
// hugot is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// hugot is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with hugot. If not, see <http://www.gnu.org/licenses/>.
package hugot
import (
"bytes"
"errors"
"flag"
"fmt"
"io"
"net/http"
"net/url"
"regexp"
"runtime/debug"
"sort"
"strings"
"context"
"github.com/golang/glog"
"github.com/mattn/go-shellwords"
)
var (
// ErrSkipHears is used by Command handlers to indicate they have
// handled a mesage and that any following Hear handlers should be
// skipped.
ErrSkipHears = errors.New("skip hear messages")
// ErrUnknownCommand is returned by a command mux if the command did
// not match any of it's registered handlers.
ErrUnknownCommand = errors.New("unknown command")
// ErrBadCLI implies that we could not process this message as a
// command line. E.g. due to potentially mismatched quoting or bad
// escaping.
ErrBadCLI = errors.New("could not process as command line")
)
// ErrUsage indicates that Command handler was used incorrectly. The
// string returned is a usage message generated by a call to -help
// for this command
type ErrUsage struct {
string
}
// Error implements the Error interface for an ErrUsage.
func (e ErrUsage) Error() string {
return e.string
}
type errNextCommand struct {
ctx context.Context
}
func (e errNextCommand) Error() string {
return "use next command"
}
// ErrNextCommand is returned if the command wishes the message
// to be passed to one of the sub-ommands of a CommandSet. The
// ctx will be passed through to the next CommandHandler
func ErrNextCommand(ctx context.Context) error {
return errNextCommand{ctx}
}
// Describer returns the name and description of a handler. This
// is used to identify the handler within Command and HTTP Muxs,
// and to provide a descriptive name for the handler in help text.
type Describer interface {
Describe() (string, string)
}
// Handler is a handler with no actual functionality
type Handler interface {
Describer
}
// ResponseWriter is used to Send messages back to a user.
type ResponseWriter interface {
Sender
io.Writer
SetChannel(c string) // Forces messages to a certain channel
SetTo(to string) // Forces messages to a certain user
SetSender(a Sender) // Forces messages to a different sender or adapter
Copy() ResponseWriter // Returns a copy of this response writer
}
type responseWriter struct {
snd Sender
msg Message
an string
}
func newResponseWriter(s Sender, m Message, an string) ResponseWriter {
return &responseWriter{s, m, an}
}
// ResponseWriterFromContext constructs a ResponseWriter from the adapter
// stored in the context. A destination Channel/User must be set to send
// messages..
func ResponseWriterFromContext(ctx context.Context) (ResponseWriter, bool) {
s, ok := SenderFromContext(ctx)
if !ok {
return nil, false
}
an := fmt.Sprintf("%T", s)
return newResponseWriter(s, Message{}, an), true
}
// Write implements the io.Writer interface. All writes create a single
// new message that is then sent to the ResoneWriter's current adapter
func (w *responseWriter) Write(bs []byte) (int, error) {
nmsg := w.msg
nmsg.Text = string(bs)
w.Send(context.TODO(), &nmsg)
return len(bs), nil
}
// SetChannel sets the outbound channel for message sent via this writer
func (w *responseWriter) SetChannel(s string) {
w.msg.Channel = s
}
// SetChannel sets the target user for message sent via this writer
func (w *responseWriter) SetTo(s string) {
w.msg.To = s
}
// SetSender sets the target adapter for sender sent via this writer
func (w *responseWriter) SetSender(s Sender) {
w.snd = s
}
// Send implements the Sender interface
func (w *responseWriter) Send(ctx context.Context, m *Message) {
messagesTx.WithLabelValues(w.an, m.Channel, m.From).Inc()
w.snd.Send(ctx, m)
}
// Copy returns a copy of this response writer
func (w *responseWriter) Copy() ResponseWriter {
return &responseWriter{w.snd, Message{}, w.an}
}
// nullSender is a sender which discards anything sent to it, this is
// useful for the help handler.
type nullSender struct {
}
// Send implements Send, and discards the message
func (nullSender) Send(ctx context.Context, m *Message) {
}
// NewNullResponseWriter creates a ResponseWriter that discards all
// message sent to it.
func NewNullResponseWriter(m Message) ResponseWriter {
return newResponseWriter(nullSender{}, m, "null")
}
type baseHandler struct {
name string
desc string
}
func (bh *baseHandler) Describe() (string, string) {
return bh.name, bh.desc
}
func newBaseHandler(name, desc string) Handler {
return &baseHandler{name, desc}
}
// RawHandler will recieve every message sent to the handler, without
// any filtering.
type RawHandler interface {
Handler
ProcessMessage(ctx context.Context, w ResponseWriter, m *Message) error
}
type baseRawHandler struct {
Handler
rhf RawFunc
}
// RawFunc describes the calling convention for RawHandler. m is the
// incoming message. Responses can be written to w.
type RawFunc func(ctx context.Context, w ResponseWriter, m *Message) error
// NewRawHandler will wrap the function f as a RawHandler with the name
// and description provided
func NewRawHandler(name, desc string, f RawFunc) RawHandler {
return &baseRawHandler{
Handler: newBaseHandler(name, desc),
rhf: f,
}
}
func (brh *baseRawHandler) ProcessMessage(ctx context.Context, w ResponseWriter, m *Message) error {
return brh.rhf(ctx, w, m)
}
// BackgroundHandler gets run when the bot starts listening. They are
// intended for publishing messages that are not in response to any
// specific incoming message.
type BackgroundHandler interface {
Handler
StartBackground(ctx context.Context, w ResponseWriter)
}
type baseBackgroundHandler struct {
Handler
bhf BackgroundFunc
}
// BackgroundFunc describes the calling convention for Background handlers
type BackgroundFunc func(ctx context.Context, w ResponseWriter)
// NewBackgroundHandler wraps f up as a BackgroundHandler with the name and
// description provided.
func NewBackgroundHandler(name, desc string, f BackgroundFunc) BackgroundHandler {
return &baseBackgroundHandler{
Handler: newBaseHandler(name, desc),
bhf: f,
}
}
func (bbh *baseBackgroundHandler) StartBackground(ctx context.Context, w ResponseWriter) {
bbh.bhf(ctx, w)
}
// HeardFunc describes the calling convention for a Hears handler.
type HeardFunc func(ctx context.Context, w ResponseWriter, m *Message, submatches [][]string) // Called once a message matches, and is passed any submatches from the regexp capture groups
// HearsHandler is a handler which responds to messages matching a specific
// pattern
type HearsHandler interface {
Handler
Hears() *regexp.Regexp // Returns the regexp we want to hear
Heard(ctx context.Context, w ResponseWriter, m *Message, submatches [][]string) // Called once a message matches, and is passed any submatches from the regexp capture groups
}
type baseHearsHandler struct {
Handler
rgxp *regexp.Regexp
hhf HeardFunc
}
// NewHearsHandler wraps f as a Hears handler that reponnds to the regexp provided, with the given name a description
func NewHearsHandler(name, desc string, rgxp *regexp.Regexp, f HeardFunc) HearsHandler {
return &baseHearsHandler{
Handler: newBaseHandler(name, desc),
rgxp: rgxp,
hhf: f,
}
}
func (bhh *baseHearsHandler) Hears() *regexp.Regexp {
return bhh.rgxp
}
func (bhh *baseHearsHandler) Heard(ctx context.Context, w ResponseWriter, m *Message, submatches [][]string) {
bhh.hhf(ctx, w, m, submatches)
}
// CommandFunc describes the calling convention for CommandHandler
type CommandFunc func(ctx context.Context, w ResponseWriter, m *Message) error
// CommandHandler handlers are used to implement CLI style commands. Before the
// Command method is called, the in the incoming message m will have the Text
// of the message parsed into invidual strings, accouting for quoting.
// m.Args(0) will be the name of the command as the handler was called, as per
// os.Args(). Command should add any requires falgs to m and then call m.Parse()
// ErrNextCommand(ctx) can be returned to inform the command mux to hand the resulting
// Args to any known sub CommandHandler.
type CommandHandler interface {
Handler
Command(ctx context.Context, w ResponseWriter, m *Message) error
}
// CommandWithSubsHandler should be implemented by any command that includes
// sub commands.
type CommandWithSubsHandler interface {
CommandHandler
SubCommands() *CommandSet // List the supported sub-commands
}
// CommandSet assists with supporting command handlers with sub-commands.
type CommandSet map[string]CommandHandler
// NewCommandSet creates an empty commands set.
func NewCommandSet() *CommandSet {
cs := make(CommandSet)
return &cs
}
// AddCommandHandler adds a CommandHandler to a CommandSet
func (cs *CommandSet) AddCommandHandler(c CommandHandler) {
n, _ := c.Describe()
(*cs)[n] = c
}
type byAlpha struct {
ns []string
ds []string
chs []CommandHandler
}
func (b *byAlpha) Len() int { return len(b.ns) }
func (b *byAlpha) Less(i, j int) bool { return b.ns[i] < b.ns[j] }
func (b *byAlpha) Swap(i, j int) {
b.ns[i], b.ns[j] = b.ns[j], b.ns[i]
b.ds[i], b.ds[j] = b.ns[j], b.ds[i]
b.chs[i], b.chs[j] = b.chs[j], b.chs[i]
}
// List returns the names and usage of the subcommands of
// a CommandSet.
func (cs *CommandSet) List() ([]string, []string, []CommandHandler) {
cmds := []string{}
descs := []string{}
chs := []CommandHandler{}
hasHelp := false
for _, ch := range *cs {
n, d := ch.Describe()
if n == "help" {
hasHelp = true
continue
}
cmds = append(cmds, n)
descs = append(descs, d)
chs = append(chs, ch)
}
sorted := &byAlpha{cmds, descs, chs}
sort.Sort(sorted)
if hasHelp {
hh := (*cs)["help"]
_, hd := hh.Describe()
sorted.ns = append([]string{"help"}, sorted.ns...)
sorted.ds = append([]string{hd}, sorted.ds...)
sorted.chs = append([]CommandHandler{hh}, sorted.chs...)
}
return sorted.ns, sorted.ds, sorted.chs
}
// NextCommand picks the next commands to run from this command set based on the content
// of the message
func (cs *CommandSet) NextCommand(ctx context.Context, w ResponseWriter, m *Message) error {
var err error
// This is repeated from RunCommandHandler, probably something wrong there
if m.args == nil {
m.args, err = shellwords.Parse(m.Text)
if err != nil {
return ErrBadCLI
}
}
if len(m.args) == 0 {
cmds, _, _ := cs.List()
return fmt.Errorf("required sub-command missing: %s", strings.Join(cmds, ", "))
}
matches := []CommandHandler{}
matchesns := []string{}
ematches := []CommandHandler{}
for name, cmd := range *cs {
if strings.HasPrefix(name, m.args[0]) {
matches = append(matches, cmd)
matchesns = append(matchesns, name)
}
if name == m.args[0] {
ematches = append(ematches, cmd)
}
}
if len(matches) == 0 && len(ematches) == 0 {
return ErrUnknownCommand
}
if len(ematches) > 1 {
return fmt.Errorf("multiple exact matches for %s", m.args[0])
}
if len(ematches) == 1 {
return runCommandHandler(ctx, ematches[0], w, m)
}
if len(matches) == 1 {
return runCommandHandler(ctx, matches[0], w, m)
}
return fmt.Errorf("ambigious command, %s: %s", m.args[0], strings.Join(matchesns, ", "))
}
type baseCommandHandler struct {
Handler
bcf CommandFunc
subs *CommandSet
}
func defaultCommandHandler(ctx context.Context, w ResponseWriter, m *Message) error {
if err := m.Parse(); err != nil {
return err
}
return ErrNextCommand(ctx)
}
// NewCommandHandler wraps the given function f as a CommandHandler with the
// provided name and description.
func NewCommandHandler(name, desc string, f CommandFunc, cs *CommandSet) CommandWithSubsHandler {
if f == nil {
f = defaultCommandHandler
}
return &baseCommandHandler{
Handler: newBaseHandler(name, desc),
bcf: f,
subs: cs,
}
}
func (bch *baseCommandHandler) Command(ctx context.Context, w ResponseWriter, m *Message) error {
var errnc errNextCommand
var ok bool
err := bch.bcf(ctx, w, m)
if errnc, ok = err.(errNextCommand); !ok {
return err
}
return bch.subs.NextCommand(errnc.ctx, w, m)
}
func (bch *baseCommandHandler) SubCommands() *CommandSet {
return bch.subs
}
// WebHookHandler handlers are used to expose a registered handler via a web server.
// The SetURL method is called to inform the handler what it's external URL will be.
// This will normally be done by the Mux. Other handlers can use URL to generate
// links suitable for external use.
// You can use the http.Handler Request.Context() to get a ResponseWriter to write
// into the bots adapters. You need to SetChannel the resulting ResponseWriter to
// send messages.
type WebHookHandler interface {
Handler
URL() *url.URL // Is called to retrieve the location of the Handler
SetURL(*url.URL) // Is called after the WebHook is added, to inform it where it lives
SetAdapter(Adapter) // Is called to set the default adapter for this handler to use
http.Handler
}
// WebHookHandlerFunc describes the called convention for a WebHook.
type WebHookHandlerFunc func(ctx context.Context, hw ResponseWriter, w http.ResponseWriter, r *http.Request)
type baseWebHookHandler struct {
ctx context.Context
a Adapter
Handler
hf http.HandlerFunc
url *url.URL
}
// ServeHTTP implement the http.Handler interface for a baseWebHandler
func (bwhh *baseWebHookHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
ctx = NewAdapterContext(ctx, bwhh.a)
r = r.WithContext(ctx)
bwhh.hf(w, r)
}
// NewWebHookHandler creates a new WebHookHandler provided name and description.
func NewWebHookHandler(name, desc string, hf http.HandlerFunc) WebHookHandler {
return &baseWebHookHandler{
Handler: newBaseHandler(name, desc),
url: &url.URL{},
hf: hf,
}
}
func (bwhh *baseWebHookHandler) SetURL(u *url.URL) {
if glog.V(2) {
glog.Infof("SetURL to %s", *u)
}
bwhh.url = u
}
func (bwhh *baseWebHookHandler) URL() *url.URL {
return bwhh.url
}
func (bwhh *baseWebHookHandler) SetAdapter(a Adapter) {
if glog.V(3) {
glog.Infof("WebHander adapter set to %#v", a)
}
bwhh.a = a
}
func glogPanic() {
err := recover()
if err != nil && err != flag.ErrHelp {
glog.Error(err)
glog.Error(string(debug.Stack()))
}
}
// Loop processes messages from adapters a and as, and passes them
// to the provided handler h. ctx can be used to stop the processesing
// and inform any running handlers. WebHookHandlers and BackgroundHandlers
// will be configured to use a as the default handler
func Loop(ctx context.Context, h Handler, a Adapter, as ...Adapter) {
an := fmt.Sprintf("%T", a)
if bh, ok := h.(BackgroundHandler); ok {
runBackgroundHandler(ctx, bh, newResponseWriter(a, Message{}, an))
}
if wh, ok := h.(WebHookHandler); ok {
wh.SetAdapter(a)
}
type smrw struct {
w ResponseWriter
m *Message
}
mrws := make(chan smrw)
for _, a := range append(as, a) {
go func(a Adapter) {
an := fmt.Sprintf("%T", a)
for {
select {
case m := <-a.Receive():
rw := newResponseWriter(a, *m, an)
mrws <- smrw{rw, m}
case <-ctx.Done():
return
}
}
}(a)
}
for {
select {
case mrw := <-mrws:
if glog.V(3) {
glog.Infof("Message: %#v", *mrw.m)
}
messagesRx.WithLabelValues(an, mrw.m.Channel, mrw.m.From).Inc()
if rh, ok := h.(RawHandler); ok {
go runRawHandler(ctx, rh, mrw.w, mrw.m)
}
if hh, ok := h.(HearsHandler); ok {
go runHearsHandler(ctx, hh, mrw.w, mrw.m)
}
if ch, ok := h.(CommandHandler); ok {
go runCommandHandler(ctx, ch, mrw.w, mrw.m)
}
case <-ctx.Done():
return
}
}
}
// runBackgroundHandler starts the provided BackgroundHandler in a new
// go routine.
func runBackgroundHandler(ctx context.Context, h BackgroundHandler, w ResponseWriter) {
glog.Infof("Starting background %v\n", h)
go func(ctx context.Context, bh BackgroundHandler) {
defer glogPanic()
h.StartBackground(ctx, w)
}(ctx, h)
}
// runRawHandler passing message m to the provided handler. go routine.
func runRawHandler(ctx context.Context, h RawHandler, w ResponseWriter, m *Message) bool {
defer glogPanic()
h.ProcessMessage(ctx, w, m)
return false
}
// runHearsHandler will match the go routine.
func runHearsHandler(ctx context.Context, h HearsHandler, w ResponseWriter, m *Message) bool {
defer glogPanic()
if mtchs := h.Hears().FindAllStringSubmatch(m.Text, -1); mtchs != nil {
go h.Heard(ctx, w, m, mtchs)
return true
}
return false
}
// runCommandHandler initializes the message m as a command message and passed
// it to the given handler.
func runCommandHandler(ctx context.Context, h CommandHandler, w ResponseWriter, m *Message) error {
if h != nil && glog.V(2) {
glog.Infof("RUNNING %v %v\n", h, m.args)
}
defer glogPanic()
var err error
if m.args == nil {
m.args, err = shellwords.Parse(m.Text)
if err != nil {
return ErrBadCLI
}
}
if len(m.args) == 0 {
//nothing to do.
return errors.New("command handler called with no possible arguments")
}
name := m.args[0]
m.flagOut = &bytes.Buffer{}
m.FlagSet = flag.NewFlagSet(name, flag.ContinueOnError)
m.FlagSet.SetOutput(m.flagOut)
err = h.Command(ctx, w, m)
if err == flag.ErrHelp {
fmt.Fprint(w, cmdUsage(h, name, nil).Error())
return ErrSkipHears
}
return err
}

147
vendor/github.com/tcolgate/hugot/help.go generated vendored Normal file
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package hugot
import (
"bytes"
"flag"
"fmt"
"io"
"strings"
"text/tabwriter"
"context"
)
type muxHelp struct {
p *Mux
}
func (mx *muxHelp) Describe() (string, string) {
return "help", "provides help"
}
func (mx *muxHelp) Command(ctx context.Context, w ResponseWriter, m *Message) error {
//capture the command we were called as
initcmd := m.args[0]
m.Parse()
cmds := m.Args()
// list the full help
if len(cmds) == 0 && initcmd == "help" {
mx.fullHelp(ctx, w, m)
} else {
if initcmd != "help" {
cmds = append([]string{initcmd}, cmds...)
}
err := mx.cmdHelp(ctx, w, cmds)
if err != nil {
return err
}
}
return ErrSkipHears
}
func (mx *muxHelp) fullHelp(ctx context.Context, w ResponseWriter, m *Message) {
out := &bytes.Buffer{}
tw := new(tabwriter.Writer)
tw.Init(out, 0, 8, 1, '\t', 0)
if len(*mx.p.cmds) > 0 {
fmt.Fprintf(out, "Available commands are:\n")
_, _, hs := (*mx.p.cmds).List()
for _, h := range hs {
n, d := h.Describe()
fmt.Fprintf(tw, " %s\t - %s\n", n, d)
}
tw.Flush()
}
if len(mx.p.hears) > 0 {
fmt.Fprintf(out, "Active hear handlers are patternss are:\n")
for r, hs := range mx.p.hears {
for _, h := range hs {
n, d := h.Describe()
fmt.Fprintf(tw, " %s\t`%s`\t - %s\n", n, r.String(), d)
}
}
tw.Flush()
}
if len(mx.p.bghndlrs) > 0 {
fmt.Fprintf(out, "Active background handlers are:\n")
for _, h := range mx.p.bghndlrs {
n, d := h.Describe()
fmt.Fprintf(tw, " %s\t - %s\n", n, d)
}
tw.Flush()
}
if len(mx.p.rhndlrs) > 0 {
fmt.Fprintf(out, "Active raw handlers are:\n")
for _, h := range mx.p.rhndlrs {
n, d := h.Describe()
fmt.Fprintf(tw, " %s\t - %s\n", n, d)
}
tw.Flush()
}
io.Copy(w, out)
}
func (mx *muxHelp) cmdHelp(ctx context.Context, w ResponseWriter, cmds []string) error {
var cs *CommandSet
var path []string
cs = mx.p.cmds
var cmd CommandHandler
for {
if len(cmds) == 0 {
break
}
ok := false
if cmd, ok = (*cs)[cmds[0]]; !ok {
return ErrUnknownCommand
}
path = append(path, cmds[0])
cmds = cmds[1:]
if sch, ok := cmd.(CommandWithSubsHandler); ok {
cs = sch.SubCommands()
} else {
break
}
}
fmt.Fprint(w, cmdUsage(cmd, strings.Join(path, " "), nil))
return nil
}
func cmdUsage(c CommandHandler, cmdStr string, err error) error {
_, desc := c.Describe()
m := &Message{args: []string{cmdStr, "-help"}}
m.flagOut = &bytes.Buffer{}
m.FlagSet = flag.NewFlagSet(cmdStr, flag.ContinueOnError)
m.FlagSet.SetOutput(m.flagOut)
c.Command(context.TODO(), NewNullResponseWriter(*m), m)
if subcx, ok := c.(CommandWithSubsHandler); ok {
subs := subcx.SubCommands()
if subs != nil && len(*subs) > 0 {
fmt.Fprintf(m.flagOut, " Sub commands:\n")
for n, s := range *subs {
_, desc := s.Describe()
fmt.Fprintf(m.flagOut, " %s - %s\n", n, desc)
}
}
}
str := ""
if err != nil {
str = fmt.Sprintf("error, %s\n", err.Error())
} else {
str = fmt.Sprintf("Description: %s\n", desc)
}
return ErrUsage{str + m.flagOut.String()}
}

85
vendor/github.com/tcolgate/hugot/message.go generated vendored Normal file
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// Copyright (c) 2016 Tristan Colgate-McFarlane
//
// This file is part of hugot.
//
// hugot is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// hugot is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with hugot. If not, see <http://www.gnu.org/licenses/>.
package hugot
import (
"bytes"
"flag"
"fmt"
"github.com/nlopes/slack"
)
// Message describes a Message from or to a user. It is intended to
// provided a resonable lowest common denominator for modern chat systems.
// It takes the Slack message format to provide that minimum but makes no
// assumption about support for any markup.
// If used within a command handler, the message can also be used as a flag.FlagSet
// for adding and processing the message as a CLI command.
type Message struct {
To string
From string
Channel string
UserID string // Verified user identitify within the source adapter
Text string // A plain text message
Attachments []Attachment
Private bool
ToBot bool
Extra interface{} // Arbitrary storage
*flag.FlagSet
args []string
flagOut *bytes.Buffer
}
// Attachment represents a rich message attachment and is directly
// modeled on the Slack attachments API
type Attachment slack.Attachment
// Reply returns a messsage with Text tx and the From and To fields switched
func (m *Message) Reply(txt string) *Message {
out := *m
out.Text = txt
out.From = ""
out.To = m.From
return &out
}
// Replyf returns message with txt set to the fmt.Printf style formatting,
// and the from/to fields switched.
func (m *Message) Replyf(s string, is ...interface{}) *Message {
return m.Reply(fmt.Sprintf(s, is...))
}
// Parse process any Args for this message in line with any flags that have
// been added to the message.
func (m *Message) Parse() error {
if len(m.args) == 0 {
return nil
}
err := m.FlagSet.Parse(m.args[1:])
m.args = m.Args()
return err
}

21
vendor/github.com/tcolgate/hugot/metrics.go generated vendored Normal file
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package hugot
import "github.com/prometheus/client_golang/prometheus"
var (
messagesTx = prometheus.NewCounterVec(prometheus.CounterOpts{
Name: "hugot_messages_sent_total",
Help: "Number of messages sent.",
},
[]string{"adapter", "channel", "user"})
messagesRx = prometheus.NewCounterVec(prometheus.CounterOpts{
Name: "hugot_messages_received_total",
Help: "Number of messages received.",
},
[]string{"adapter", "channel", "user"})
)
func init() {
prometheus.MustRegister(messagesTx)
prometheus.MustRegister(messagesRx)
}

345
vendor/github.com/tcolgate/hugot/mux.go generated vendored Normal file
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// Copyright (c) 2016 Tristan Colgate-McFarlane
//
// This file is part of hugot.
//
// hugot is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// hugot is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with hugot. If not, see <http://www.gnu.org/licenses/>.
package hugot
import (
"errors"
"fmt"
"net/http"
"net/url"
"regexp"
"sync"
"github.com/golang/glog"
"context"
)
func init() {
DefaultMux = NewMux("hugot", "")
http.Handle("/hugot", DefaultMux)
http.Handle("/hugot/", DefaultMux)
}
// Mux is a Handler that multiplexes messages to a set of Command, Hears, and
// Raw handlers.
type Mux struct {
name string
desc string
burl *url.URL
*sync.RWMutex
hndlrs []Handler // All the handlers
rhndlrs []RawHandler // Raw handlers
bghndlrs []BackgroundHandler // Long running background handlers
whhndlrs map[string]WebHookHandler // WebHooks
hears map[*regexp.Regexp][]HearsHandler // Hearing handlers
cmds *CommandSet // Command handlers
httpm *http.ServeMux // http Mux
}
// DefaultMux is a default Mux instance, http Handlers will be added to
// http.DefaultServeMux
var DefaultMux *Mux
// NewMux creates a new Mux.
func NewMux(name, desc string) *Mux {
mx := &Mux{
name: name,
desc: desc,
RWMutex: &sync.RWMutex{},
rhndlrs: []RawHandler{},
bghndlrs: []BackgroundHandler{},
whhndlrs: map[string]WebHookHandler{},
hears: map[*regexp.Regexp][]HearsHandler{},
cmds: NewCommandSet(),
httpm: http.NewServeMux(),
burl: &url.URL{Path: "/" + name},
}
mx.HandleCommand(&muxHelp{mx})
return mx
}
// Describe implements the Describe method of Handler for
// the Mux
func (mx *Mux) Describe() (string, string) {
return mx.name, mx.desc
}
// URL returns the base URL for the default Mux
func URL() *url.URL {
return DefaultMux.URL()
}
// URL returns the base URL for this Mux
func (mx *Mux) URL() *url.URL {
mx.RLock()
defer mx.RUnlock()
return mx.url()
}
func (mx *Mux) url() *url.URL {
return mx.burl
}
// SetURL sets the base URL for web hooks.
func SetURL(b *url.URL) {
if b.Path != "" {
panic(errors.New("Can't set URL with path at the moment, sorry"))
}
DefaultMux.SetURL(b)
}
// SetURL sets the base URL for this mux's web hooks.
func (mx *Mux) SetURL(b *url.URL) {
mx.Lock()
defer mx.Unlock()
mx.burl = b
for _, h := range mx.whhndlrs {
n, _ := h.Describe()
p := fmt.Sprintf("%s/%s/%s/", b.Path, mx.name, n)
nu := *b
nu.Path = p
h.SetURL(&nu)
}
}
// StartBackground starts any registered background handlers.
func (mx *Mux) StartBackground(ctx context.Context, w ResponseWriter) {
mx.Lock()
defer mx.Unlock()
for _, h := range mx.bghndlrs {
go runBackgroundHandler(ctx, h, w.Copy())
}
}
// SetAdapter sets the adapter on all the webhook of this mux.
func (mx *Mux) SetAdapter(a Adapter) {
mx.Lock()
defer mx.Unlock()
for _, wh := range mx.whhndlrs {
wh.SetAdapter(a)
}
}
// ProcessMessage implements the Handler interface. Message will first be passed to
// any registered RawHandlers. If the message has been deemed, by the Adapter
// to have been sent directly to the bot, any comand handlers will be processed.
// Then, if appropriate, the message will be matched against any Hears patterns
// and all matching Heard functions will then be called.
// Any unrecognized errors from the Command handlers will be passed back to the
// user that sent us the message.
func (mx *Mux) ProcessMessage(ctx context.Context, w ResponseWriter, m *Message) error {
mx.RLock()
defer mx.RUnlock()
var err error
// We run all raw message handlers
for _, rh := range mx.rhndlrs {
mc := *m
go rh.ProcessMessage(ctx, w, &mc)
}
if m.ToBot {
err = mx.cmds.NextCommand(ctx, w, m)
}
if err == ErrSkipHears {
return nil
}
for _, hhs := range mx.hears {
for _, hh := range hhs {
mc := *m
if runHearsHandler(ctx, hh, w, &mc) {
err = nil
}
}
}
if err != nil {
fmt.Fprintf(w, "error, %s", err.Error())
}
return nil
}
// Handle adds the provided handler to the DefaultMux
func Handle(h Handler) error {
return DefaultMux.Handle(h)
}
// Handle adds a generic handler that supports one or more of the handler
// types. WARNING: This may be removed in the future. Prefer to
// the specific Add*Handler methods.
func (mx *Mux) Handle(h Handler) error {
var used bool
if h, ok := h.(RawHandler); ok {
mx.HandleRaw(h)
used = true
}
if h, ok := h.(BackgroundHandler); ok {
mx.HandleBackground(h)
used = true
}
if h, ok := h.(CommandHandler); ok {
mx.HandleCommand(h)
used = true
}
if h, ok := h.(HearsHandler); ok {
mx.HandleHears(h)
used = true
}
if h, ok := h.(WebHookHandler); ok {
mx.HandleHTTP(h)
used = true
}
mx.Lock()
defer mx.Unlock()
if !used {
return fmt.Errorf("Don't know how to use %T as a handler", h)
}
mx.hndlrs = append(mx.hndlrs, h)
return nil
}
// HandleRaw adds the provided handler to the DefaultMux
func HandleRaw(h RawHandler) error {
return DefaultMux.HandleRaw(h)
}
// HandleRaw adds the provided handler to the Mux. All
// messages sent to the mux will be forwarded to this handler.
func (mx *Mux) HandleRaw(h RawHandler) error {
mx.Lock()
defer mx.Unlock()
if h, ok := h.(RawHandler); ok {
mx.rhndlrs = append(mx.rhndlrs, h)
}
return nil
}
// HandleBackground adds the provided handler to the DefaultMux
func HandleBackground(h BackgroundHandler) error {
return DefaultMux.HandleBackground(h)
}
// HandleBackground adds the provided handler to the Mux. It
// will be started with the Mux is started.
func (mx *Mux) HandleBackground(h BackgroundHandler) error {
mx.Lock()
defer mx.Unlock()
//name, _ := h.Describe()
mx.bghndlrs = append(mx.bghndlrs, h)
return nil
}
// HandleHears adds the provided handler to the DefaultMux
func HandleHears(h HearsHandler) error {
return DefaultMux.HandleHears(h)
}
// HandleHears adds the provided handler to the mux. All
// messages matching the Hears patterns will be forwarded to
// the handler.
func (mx *Mux) HandleHears(h HearsHandler) error {
mx.Lock()
defer mx.Unlock()
r := h.Hears()
mx.hears[r] = append(mx.hears[r], h)
return nil
}
// HandleCommand adds the provided handler to the DefaultMux
func HandleCommand(h CommandHandler) {
DefaultMux.HandleCommand(h)
}
// HandleCommand adds the provided handler to the mux.
func (mx *Mux) HandleCommand(h CommandHandler) {
mx.Lock()
defer mx.Unlock()
mx.cmds.AddCommandHandler(h)
}
type webHookBridge struct {
nh http.Handler
}
func (whb *webHookBridge) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if glog.V(2) {
glog.Infof("webHookBridge ServeHTTP %v %s\n", *whb, *r)
}
whb.nh.ServeHTTP(w, r)
}
// HandleHTTP adds the provided handler to the DefaultMux
func HandleHTTP(h WebHookHandler) {
DefaultMux.HandleHTTP(h)
}
// HandleHTTP registers h as a WebHook handler. The name
// of the Mux, and the name of the handler are used to
// construct a unique URL that can be used to send web
// requests to this handler
func (mx *Mux) HandleHTTP(h WebHookHandler) {
mx.Lock()
defer mx.Unlock()
n, _ := h.Describe()
p := fmt.Sprintf("/%s/%s", mx.name, n)
mx.httpm.Handle(p, h)
mx.httpm.Handle(p+"/", h)
if glog.V(2) {
glog.Infof("registering %v at %s, on %v\n", h, p, mx.httpm)
}
mx.whhndlrs[n] = h
mu := mx.url()
nu := *mu
nu.Path = fmt.Sprintf("/%s/%s/", mx.name, n)
h.SetURL(&nu)
}
// ServeHTTP iplements http.ServeHTTP for a Mux to allow it to
// act as a web server.
func (mx *Mux) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if glog.V(2) {
glog.Infof("Mux ServeHTTP %s\n", *r)
}
mx.httpm.ServeHTTP(w, r)
}

32
vendor/github.com/tcolgate/hugot/storage.go generated vendored Normal file
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package hugot
// Storer is an interface to external key/value storage
type Storer interface {
Get(key []byte) ([]byte, bool, error)
Set(key []byte, value []byte) error
Unset(key []byte) error
}
type prefixStore struct {
pfx []byte
base Storer
}
func (p prefixStore) Get(key []byte) ([]byte, bool, error) {
return p.base.Get(append(p.pfx, key...))
}
func (p prefixStore) Set(key []byte, value []byte) error {
return p.base.Set(append(p.pfx, key...), value)
}
func (p prefixStore) Unset(key []byte) error {
return p.base.Unset(append(p.pfx, key...))
}
func newPrefixedStore(pfx []byte, s Storer) prefixStore {
return prefixStore{
pfx: append(pfx, []byte("#")...),
base: s,
}
}