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bot.go
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bot.go
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package bertybot
import (
"context"
"fmt"
"sync"
"time"
"go.uber.org/zap"
"moul.io/u"
"berty.tech/berty/v2/go/pkg/messengertypes"
)
type Bot struct {
client messengertypes.MessengerServiceClient
logger *zap.Logger
displayName string
bertyID *messengertypes.InstanceShareableBertyID_Reply
withReplay bool
withFromMyself bool
withEntityUpdates bool
handlers map[HandlerType][]Handler
isReplaying bool
handledEvents uint
commands map[string]command
store struct {
conversations map[string]*messengertypes.Conversation
mutex sync.Mutex
}
}
// New initializes a new Bot.
// The order of the passed options may have an impact.
func New(opts ...NewOption) (*Bot, error) {
b := Bot{
logger: zap.NewNop(),
handlers: make(map[HandlerType][]Handler),
commands: make(map[string]command),
}
b.store.conversations = make(map[string]*messengertypes.Conversation)
// configure bot with options
for _, opt := range opts {
if err := opt(&b); err != nil {
return nil, fmt.Errorf("bot: opt failed: %w", err)
}
}
// check minimal requirements
if b.client == nil {
return nil, fmt.Errorf("bot: missing messenger client")
}
// apply defaults
if b.displayName == "" {
b.displayName = "My Berty Bot"
}
// retrieve Berty ID to check if everything is well configured, and cache it for easy access
{
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
req := &messengertypes.InstanceShareableBertyID_Request{
DisplayName: b.displayName,
}
ret, err := b.client.InstanceShareableBertyID(ctx, req)
if err != nil {
return nil, fmt.Errorf("bot: cannot retrieve berty ID: %w", err)
}
b.bertyID = ret
}
return &b, nil
}
// BertyIDURL returns the shareable Berty ID in the form of `https://berty.tech/id#xxx`.
func (b *Bot) BertyIDURL() string {
return b.bertyID.WebURL
}
// PublicKey returns the public key of the messenger node.
func (b *Bot) PublicKey() string {
return u.B64Encode(b.bertyID.Link.BertyID.AccountPK)
}
// Start starts the main event loop and can be stopped by canceling the passed context.
func (b *Bot) Start(ctx context.Context) error {
b.logger.Info("connecting to the event stream")
s, err := b.client.EventStream(ctx, &messengertypes.EventStream_Request{})
if err != nil {
return fmt.Errorf("failed to listen to EventStream: %w", err)
}
b.isReplaying = true
for {
gme, err := s.Recv()
if err != nil {
return fmt.Errorf("stream error: %w", err)
}
if b.isReplaying {
if gme.Event.Type == messengertypes.StreamEvent_TypeListEnded {
b.logger.Info("finished replaying logs from the previous sessions", zap.Uint("count", b.handledEvents))
b.isReplaying = false
}
b.handledEvents++
if !b.withReplay {
continue
}
}
if err := b.handleEvent(ctx, gme.Event); err != nil {
b.logger.Error("bot.handleEvent failed", zap.Error(err))
}
}
}