NewConnWith returns a new kafka connection configured with config. The offset is initialized to FirstOffset.
(conn net.Conn, config ConnConfig)
| 162 | // NewConnWith returns a new kafka connection configured with config. |
| 163 | // The offset is initialized to FirstOffset. |
| 164 | func NewConnWith(conn net.Conn, config ConnConfig) *Conn { |
| 165 | if len(config.ClientID) == 0 { |
| 166 | config.ClientID = DefaultClientID |
| 167 | } |
| 168 | |
| 169 | if config.Partition < 0 || config.Partition > math.MaxInt32 { |
| 170 | panic(fmt.Sprintf("invalid partition number: %d", config.Partition)) |
| 171 | } |
| 172 | |
| 173 | c := &Conn{ |
| 174 | conn: conn, |
| 175 | rbuf: *bufio.NewReader(conn), |
| 176 | wbuf: *bufio.NewWriter(conn), |
| 177 | clientID: config.ClientID, |
| 178 | topic: config.Topic, |
| 179 | partition: int32(config.Partition), |
| 180 | broker: int32(config.Broker), |
| 181 | rack: config.Rack, |
| 182 | offset: FirstOffset, |
| 183 | requiredAcks: -1, |
| 184 | transactionalID: emptyToNullable(config.TransactionalID), |
| 185 | } |
| 186 | |
| 187 | c.wb.w = &c.wbuf |
| 188 | |
| 189 | // The fetch request needs to ask for a MaxBytes value that is at least |
| 190 | // enough to load the control data of the response. To avoid having to |
| 191 | // recompute it on every read, it is cached here in the Conn value. |
| 192 | c.fetchMinSize = (fetchResponseV2{ |
| 193 | Topics: []fetchResponseTopicV2{{ |
| 194 | TopicName: config.Topic, |
| 195 | Partitions: []fetchResponsePartitionV2{{ |
| 196 | Partition: int32(config.Partition), |
| 197 | MessageSet: messageSet{{}}, |
| 198 | }}, |
| 199 | }}, |
| 200 | }).size() |
| 201 | c.fetchMaxBytes = math.MaxInt32 - c.fetchMinSize |
| 202 | return c |
| 203 | } |
| 204 | |
| 205 | func (c *Conn) negotiateVersion(key apiKey, sortedSupportedVersions ...apiVersion) (apiVersion, error) { |
| 206 | v, err := c.loadVersions() |