peer

package
v0.50.0-alpha.4 Latest Latest
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 Go to latest Published: Aug 23, 2021 License: MIT Imports: 11 Imported by: 31

Documentation

Overview

Package peer conatains some peer resolving and extracting helpers.

Index

Examples

Constants

This section is empty.

Variables

This section is empty.

Functions

func ToInputChannel added in v0.33.0 

func ToInputChannel(channel tg.InputPeerClass) (tg.InputChannelClass, bool)

ToInputChannel converts given peer to input channel if possible.

func ToInputUser added in v0.33.0 

func ToInputUser(user tg.InputPeerClass) (tg.InputUserClass, bool)

ToInputUser converts given peer to input user if possible.

Types

type ConstraintError added in v0.35.0 

type ConstraintError struct {
	Expected string
	Got      tg.InputPeerClass
}

ConstraintError is a peer resolve constraint error.

func (*ConstraintError) Error added in v0.35.0 

func (c *ConstraintError) Error() string

Error implements error.

type DialogKey added in v0.27.0 

type DialogKey struct {
	Kind       Kind
	ID         int
	AccessHash int64
}

DialogKey is a generic peer key.

func (*DialogKey) FromInputPeer added in v0.27.0 

func (d *DialogKey) FromInputPeer(peer tg.InputPeerClass) error

FromInputPeer fills key using given peer.

func (*DialogKey) FromPeer added in v0.27.0 

func (d *DialogKey) FromPeer(peer tg.PeerClass) error

FromPeer fills key using given peer.

type Entities 

type Entities struct {
	// contains filtered or unexported fields
}

Entities is simple peer entities storage.

func EntitiesFromResult 

func EntitiesFromResult(r EntitySearchResult) Entities

EntitiesFromResult fills Entities struct using given context.

func EntitiesFromUpdate 

func EntitiesFromUpdate(uctx tg.Entities) Entities

EntitiesFromUpdate fills Entities struct using given context.

func NewEntities 

func NewEntities(
	users map[int]*tg.User,
	chats map[int]*tg.Chat,
	channels map[int]*tg.Channel,
) Entities

NewEntities creates new Entities struct.

func (Entities) Channel added in v0.33.0 

func (ent Entities) Channel(id int) (*tg.Channel, bool)

Channel finds channel by given ID.

func (Entities) Channels added in v0.38.0 

func (ent Entities) Channels() map[int]*tg.Channel

Channels returns map of channels. Notice that returned map is not a copy.

func (Entities) Chat added in v0.33.0 

func (ent Entities) Chat(id int) (*tg.Chat, bool)

Chat finds chat by given ID.

func (Entities) Chats added in v0.38.0 

func (ent Entities) Chats() map[int]*tg.Chat

Chats returns map of chats. Notice that returned map is not a copy.

func (Entities) ExtractPeer 

func (ent Entities) ExtractPeer(peerID tg.PeerClass) (tg.InputPeerClass, error)

ExtractPeer finds and creates InputPeerClass using given PeerClass.

func (Entities) Fill 

func (ent Entities) Fill(
	users map[int]*tg.User,
	chats map[int]*tg.Chat,
	channels map[int]*tg.Channel,
)

Fill adds and updates all entities from given maps.

func (Entities) FillFromResult 

func (ent Entities) FillFromResult(r EntitySearchResult)

FillFromResult adds and updates all entities from given result.

func (Entities) FillFromUpdate 

func (ent Entities) FillFromUpdate(uctx tg.Entities)

FillFromUpdate adds and updates all entities from given updates.

func (Entities) User added in v0.33.0 

func (ent Entities) User(id int) (*tg.User, bool)

User finds user by given ID.

func (Entities) Users added in v0.38.0 

func (ent Entities) Users() map[int]*tg.User

Users returns map of users. Notice that returned map is not a copy.

type EntitySearchResult 

type EntitySearchResult interface {
	MapChats() tg.ChatClassArray
	MapUsers() tg.UserClassArray
}

EntitySearchResult is abstraction for different RPC responses which contains entities.

type Kind added in v0.27.0 

type Kind int

Kind represents peer kind. 

const (
	// User is a private chat with user.
	User Kind = iota
	// Chat is a legacy chat.
	Chat
	// Channel is a supergroup/channel.
	Channel
)

type LRUResolver 

type LRUResolver struct {
	// contains filtered or unexported fields
}

LRUResolver is simple decorator for Resolver to cache result in LRU.

Example (Cache) 
package main

import (
	"context"
	"fmt"
	"os"
	"os/signal"
	"time"

	"github.com/gotd/td/telegram"
	"github.com/gotd/td/telegram/message"
	"github.com/gotd/td/telegram/message/peer"
	"github.com/gotd/td/tg"
)

func resolveLRU(ctx context.Context) error {
	client, err := telegram.ClientFromEnvironment(telegram.Options{})
	if err != nil {
		return err
	}

	return client.Run(ctx, func(ctx context.Context) error {
		raw := tg.NewClient(client)
		resolver := peer.NewLRUResolver(peer.Plain(raw), 16).WithExpiration(time.Minute)
		sender := message.NewSender(raw).WithResolver(resolver)

		// "durovschat" will be resolved by Plain resolver.
		if _, err := sender.Resolve("@durovschat").Dice(ctx); err != nil {
			return err
		}

		// "durovschat" will be resolved by cache.
		if _, err := sender.Resolve("https://t.me/durovschat").Darts(ctx); err != nil {
			return err
		}

		// Evict and delete record.
		resolver.Evict("durovschat")

		return nil
	})
}

func main() {
	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt)
	defer cancel()

	if err := resolveLRU(ctx); err != nil {
		_, _ = fmt.Fprintf(os.Stderr, "%+v\n", err)
		os.Exit(2)
	}
}

Output:

func NewLRUResolver 

func NewLRUResolver(next Resolver, capacity int) *LRUResolver

NewLRUResolver creates new LRUResolver.

func (*LRUResolver) Evict added in v0.36.0 

func (l *LRUResolver) Evict(key string) (tg.InputPeerClass, bool)

Evict deletes record from cache.

func (*LRUResolver) ResolveDomain added in v0.31.0 

func (l *LRUResolver) ResolveDomain(ctx context.Context, domain string) (tg.InputPeerClass, error)

ResolveDomain implements Resolver.

func (*LRUResolver) ResolvePhone added in v0.30.0 

func (l *LRUResolver) ResolvePhone(ctx context.Context, phone string) (tg.InputPeerClass, error)

ResolvePhone implements Resolver.

func (*LRUResolver) WithClock added in v0.36.0 

func (l *LRUResolver) WithClock(c clock.Clock) *LRUResolver

WithClock sets clock to use when counting expiration.

func (*LRUResolver) WithExpiration added in v0.36.0 

func (l *LRUResolver) WithExpiration(expiration time.Duration) *LRUResolver

WithExpiration sets expiration timeout for records in cache. If zero, expiration will be disabled. Default value is a minute.

type Promise added in v0.27.0 

type Promise func(ctx context.Context) (tg.InputPeerClass, error)

Promise is a peer promise.

func OnlyChannel added in v0.30.0 

func OnlyChannel(p Promise) Promise

OnlyChannel returns Promise which returns error if resolved peer is not a channel.

func OnlyChat added in v0.30.0 

func OnlyChat(p Promise) Promise

OnlyChat returns Promise which returns error if resolved peer is not a chat.

func OnlyUser added in v0.30.0 

func OnlyUser(p Promise) Promise

OnlyUser returns Promise which returns error if resolved peer is not a user.

func OnlyUserID added in v0.35.0 

func OnlyUserID(p Promise) Promise

OnlyUserID returns Promise which returns error if resolved peer is not a user object with ID. Unlike OnlyUser, it returns error if resolved peer is tg.InputPeerSelf.

func Resolve added in v0.27.0 

func Resolve(r Resolver, from string) Promise

Resolve uses given string to create new peer promise. It resolves peer of message using given Resolver. Input examples: 

@telegram
telegram
t.me/telegram
https://t.me/telegram
tg:resolve?domain=telegram
tg://resolve?domain=telegram
+13115552368
+1 (311) 555-0123
+1 311 555-6162
13115556162

func ResolveDeeplink(r Resolver, u string) Promise

ResolveDeeplink uses given deeplink to create new peer promise. Deeplink is a URL like https://t.me/telegram. It resolves peer of message using given Resolver. Input examples: 

t.me/telegram
https://t.me/telegram
tg:resolve?domain=telegram
tg://resolve?domain=telegram

func ResolveDomain added in v0.27.0 

func ResolveDomain(r Resolver, domain string) Promise

ResolveDomain uses given domain to create new peer promise. It resolves peer of message using given Resolver. Can has prefix with @ or not. Input examples: 

@telegram
telegram

func ResolvePhone added in v0.30.0 

func ResolvePhone(r Resolver, phone string) Promise

ResolvePhone uses given phone to create new peer promise. It resolves peer of message using given Resolver. Input example: 

+13115552368
+1 (311) 555-0123
+1 311 555-6162
13115556162

Note that Telegram represents phone numbers according to the E.164 standard without the plus sign (”+”) prefix. The resolver therefore takes an easy route and just deletes any non-digit symbols from phone number string.

type PromiseDecorator added in v0.30.0 

type PromiseDecorator = func(Promise) Promise

PromiseDecorator is a decorator of peer promise.

type Resolver 

type Resolver interface {
	ResolveDomain(ctx context.Context, domain string) (tg.InputPeerClass, error)
	ResolvePhone(ctx context.Context, phone string) (tg.InputPeerClass, error)
}

Resolver is an abstraction to resolve domains and Telegram deeplinks.

func DefaultResolver 

func DefaultResolver(raw *tg.Client) Resolver

DefaultResolver creates and returns default resolver.

func Plain added in v0.36.0 

func Plain(raw *tg.Client) Resolver

Plain creates plain resolver.

func SingleflightResolver added in v0.36.0 

func SingleflightResolver(next Resolver) Resolver

SingleflightResolver is a simple resolver decorator which prevents duplicate resolve calls.

Source Files

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