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package config
import "fmt"
// Defined Kafka topics.
const (
TopicOutputTypingEvent = "OutputTypingEvent"
TopicOutputSendToDeviceEvent = "OutputSendToDeviceEvent"
TopicOutputKeyChangeEvent = "OutputKeyChangeEvent"
TopicOutputRoomEvent = "OutputRoomEvent"
TopicOutputClientData = "OutputClientData"
TopicOutputReceiptEvent = "OutputReceiptEvent"
)
type Kafka struct {
// A list of kafka addresses to connect to.
Addresses []string `yaml:"addresses"`
// The prefix to use for Kafka topic names for this homeserver - really only
// useful if running more than one Dendrite on the same Kafka deployment.
TopicPrefix string `yaml:"topic_prefix"`
// Whether to use naffka instead of kafka.
// Naffka can only be used when running dendrite as a single monolithic server.
// Kafka can be used both with a monolithic server and when running the
// components as separate servers.
UseNaffka bool `yaml:"use_naffka"`
// The Naffka database is used internally by the naffka library, if used.
Database DatabaseOptions `yaml:"naffka_database"`
// The max size a Kafka message passed between consumer/producer can have
// Equals roughly max.message.bytes / fetch.message.max.bytes in Kafka
MaxMessageBytes *int `yaml:"max_message_bytes"`
}
func (k *Kafka) TopicFor(name string) string {
return fmt.Sprintf("%s%s", k.TopicPrefix, name)
}
func (c *Kafka) Defaults() {
c.UseNaffka = true
c.Database.Defaults()
c.Addresses = []string{"localhost:2181"}
c.Database.ConnectionString = DataSource("file:naffka.db")
c.TopicPrefix = "Dendrite"
maxBytes := 1024 * 1024 * 8 // about 8MB
c.MaxMessageBytes = &maxBytes
}
func (c *Kafka) Verify(configErrs *ConfigErrors, isMonolith bool) {
if c.UseNaffka {
if !isMonolith {
configErrs.Add("naffka can only be used in a monolithic server")
}
checkNotEmpty(configErrs, "global.kafka.database.connection_string", string(c.Database.ConnectionString))
} else {
// If we aren't using naffka then we need to have at least one kafka
// server to talk to.
checkNotZero(configErrs, "global.kafka.addresses", int64(len(c.Addresses)))
}
checkNotEmpty(configErrs, "global.kafka.topic_prefix", string(c.TopicPrefix))
checkPositive(configErrs, "global.kafka.max_message_bytes", int64(*c.MaxMessageBytes))
}
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