forked from MixinNetwork/supergroup.mixin.one
/
distributed_message.go
178 lines (159 loc) · 5.97 KB
/
distributed_message.go
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package models
import (
"context"
"fmt"
"sort"
"strings"
"time"
"cloud.google.com/go/spanner"
bot "github.com/MixinNetwork/bot-api-go-client"
"github.com/MixinNetwork/supergroup.mixin.one/config"
"github.com/MixinNetwork/supergroup.mixin.one/session"
"google.golang.org/api/iterator"
)
const (
DistributeSubscriberLimit = 300
ExpiredDistributedMessageLimit = 100
PendingDistributedMessageLimit = 20
)
const distributed_messages_DDL = `
CREATE TABLE distributed_messages (
message_id STRING(36) NOT NULL,
conversation_id STRING(36) NOT NULL,
recipient_id STRING(36) NOT NULL,
user_id STRING(36) NOT NULL,
category STRING(512) NOT NULL,
data BYTES(MAX) NOT NULL,
created_at TIMESTAMP NOT NULL,
updated_at TIMESTAMP NOT NULL,
) PRIMARY KEY(message_id);
CREATE INDEX distributed_messages_by_updated ON distributed_messages(updated_at);
`
var distributedMessagesCols = []string{"message_id", "conversation_id", "recipient_id", "user_id", "category", "data", "created_at", "updated_at"}
func (dm *DistributedMessage) values() []interface{} {
return []interface{}{dm.MessageId, dm.ConversationId, dm.RecipientId, dm.UserId, dm.Category, dm.Data, dm.CreatedAt, dm.UpdatedAt}
}
type DistributedMessage struct {
MessageId string
ConversationId string
RecipientId string
UserId string
Category string
Data []byte
CreatedAt time.Time
UpdatedAt time.Time
}
func createDistributeMessage(ctx context.Context, userId, recipientId, category string, data []byte) *spanner.Mutation {
t := time.Now()
dm := &DistributedMessage{
MessageId: bot.UuidNewV4().String(),
ConversationId: UniqueConversationId(config.ClientId, recipientId),
RecipientId: recipientId,
UserId: userId,
Category: category,
Data: data,
CreatedAt: t,
UpdatedAt: t,
}
return spanner.Insert("distributed_messages", distributedMessagesCols, dm.values())
}
func (message *Message) Distribute(ctx context.Context) error {
for {
ids, subscribedAt, err := subscribedUserIds(ctx, message.LastDistributeAt, DistributeSubscriberLimit)
if err != nil {
return session.TransactionError(ctx, err)
}
mutations := []*spanner.Mutation{}
for _, id := range ids {
if id == message.UserId {
continue
}
mutations = append(mutations, createDistributeMessage(ctx, message.UserId, id, message.Category, message.Data))
}
if len(ids) < DistributeSubscriberLimit {
message.LastDistributeAt = time.Now()
message.State = MessageStateSuccess
mutations = append(mutations, spanner.Update("messages", []string{"message_id", "state", "last_distribute_at"}, []interface{}{message.MessageId, message.State, message.LastDistributeAt}))
} else {
message.LastDistributeAt = subscribedAt
mutations = append(mutations, spanner.Update("messages", []string{"message_id", "last_distribute_at"}, []interface{}{message.MessageId, message.LastDistributeAt}))
}
if err := session.Database(ctx).Apply(ctx, mutations, "distributed_messages", "INSERT", "DistributeMessage"); err != nil {
return session.TransactionError(ctx, err)
}
if message.State == MessageStateSuccess {
break
}
}
return nil
}
func PendingDistributedMessages(ctx context.Context, limit int64) ([]*DistributedMessage, error) {
var messages []*DistributedMessage
txn := session.Database(ctx).ReadOnlyTransaction()
defer txn.Close()
offset, err := ReadPropertyAsOffset(ctx, MessageQueueCheckpoint)
if err != nil {
return messages, err
}
query := fmt.Sprintf("SELECT message_id FROM distributed_messages@{FORCE_INDEX=distributed_messages_by_updated} WHERE updated_at>@updated_at ORDER BY updated_at LIMIT %d", limit)
params := map[string]interface{}{"updated_at": offset}
ids, err := readCollectionIds(ctx, txn, query, params)
if err != nil || len(ids) == 0 {
return messages, err
}
it := txn.Query(ctx, spanner.Statement{
SQL: fmt.Sprintf("SELECT %s FROM distributed_messages WHERE message_id IN UNNEST(@message_ids)", strings.Join(distributedMessagesCols, ",")),
Params: map[string]interface{}{"message_ids": ids},
})
defer it.Stop()
for {
row, err := it.Next()
if err == iterator.Done {
break
} else if err != nil {
return messages, session.TransactionError(ctx, err)
}
message, err := distributedMessageFromRow(row)
if err != nil {
return messages, session.TransactionError(ctx, err)
}
messages = append(messages, message)
}
sort.Slice(messages, func(i, j int) bool { return messages[i].UpdatedAt.Before(messages[j].UpdatedAt) })
return messages, nil
}
func ExpiredDistributedMessageIds(ctx context.Context) ([]string, error) {
txn := session.Database(ctx).ReadOnlyTransaction()
defer txn.Close()
var offset time.Time
timestamp, err := readProperty(ctx, txn, MessageQueueCheckpoint)
if err != nil {
return nil, err
}
if timestamp != "" {
offset, err = time.Parse(time.RFC3339Nano, timestamp)
}
if err != nil {
return nil, err
}
query := fmt.Sprintf("SELECT message_id FROM distributed_messages@{FORCE_INDEX=distributed_messages_by_updated} WHERE updated_at<@updated_at ORDER BY updated_at LIMIT %d", ExpiredDistributedMessageLimit)
params := map[string]interface{}{"updated_at": offset}
return readCollectionIds(ctx, txn, query, params)
}
func CleanUpExpiredDistributedMessages(ctx context.Context, ids []string) error {
var keySets []spanner.KeySet
for _, id := range ids {
keySets = append(keySets, spanner.Key{id})
}
if err := session.Database(ctx).Apply(ctx, []*spanner.Mutation{
spanner.Delete("distributed_messages", spanner.KeySets(keySets...)),
}, "distributed_messages", "DELETE", "DeleteDistributedMessage"); err != nil {
return session.TransactionError(ctx, err)
}
return nil
}
func distributedMessageFromRow(row *spanner.Row) (*DistributedMessage, error) {
var m DistributedMessage
err := row.Columns(&m.MessageId, &m.ConversationId, &m.RecipientId, &m.UserId, &m.Category, &m.Data, &m.CreatedAt, &m.UpdatedAt)
return &m, err
}