| /** |
| * Copyright 2016 Confluent Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package kafka |
| |
| import ( |
| "unsafe" |
| ) |
| |
| /* |
| #include <stdlib.h> |
| #include <librdkafka/rdkafka.h> |
| |
| struct rd_kafka_metadata_broker *_getMetadata_broker_element(struct rd_kafka_metadata *m, int i) { |
| return &m->brokers[i]; |
| } |
| |
| struct rd_kafka_metadata_topic *_getMetadata_topic_element(struct rd_kafka_metadata *m, int i) { |
| return &m->topics[i]; |
| } |
| |
| struct rd_kafka_metadata_partition *_getMetadata_partition_element(struct rd_kafka_metadata *m, int topic_idx, int partition_idx) { |
| return &m->topics[topic_idx].partitions[partition_idx]; |
| } |
| |
| int32_t _get_int32_element (int32_t *arr, int i) { |
| return arr[i]; |
| } |
| |
| */ |
| import "C" |
| |
| // BrokerMetadata contains per-broker metadata |
| type BrokerMetadata struct { |
| ID int32 |
| Host string |
| Port int |
| } |
| |
| // PartitionMetadata contains per-partition metadata |
| type PartitionMetadata struct { |
| ID int32 |
| Error Error |
| Leader int32 |
| Replicas []int32 |
| Isrs []int32 |
| } |
| |
| // TopicMetadata contains per-topic metadata |
| type TopicMetadata struct { |
| Topic string |
| Partitions []PartitionMetadata |
| Error Error |
| } |
| |
| // Metadata contains broker and topic metadata for all (matching) topics |
| type Metadata struct { |
| Brokers []BrokerMetadata |
| Topics map[string]TopicMetadata |
| |
| OriginatingBroker BrokerMetadata |
| } |
| |
| // getMetadata queries broker for cluster and topic metadata. |
| // If topic is non-nil only information about that topic is returned, else if |
| // allTopics is false only information about locally used topics is returned, |
| // else information about all topics is returned. |
| func getMetadata(H Handle, topic *string, allTopics bool, timeoutMs int) (*Metadata, error) { |
| h := H.gethandle() |
| |
| var rkt *C.rd_kafka_topic_t |
| if topic != nil { |
| rkt = h.getRkt(*topic) |
| } |
| |
| var cMd *C.struct_rd_kafka_metadata |
| cErr := C.rd_kafka_metadata(h.rk, bool2cint(allTopics), |
| rkt, &cMd, C.int(timeoutMs)) |
| if cErr != C.RD_KAFKA_RESP_ERR_NO_ERROR { |
| return nil, newError(cErr) |
| } |
| |
| m := Metadata{} |
| defer C.rd_kafka_metadata_destroy(cMd) |
| |
| m.Brokers = make([]BrokerMetadata, cMd.broker_cnt) |
| for i := 0; i < int(cMd.broker_cnt); i++ { |
| b := C._getMetadata_broker_element(cMd, C.int(i)) |
| m.Brokers[i] = BrokerMetadata{int32(b.id), C.GoString(b.host), |
| int(b.port)} |
| } |
| |
| m.Topics = make(map[string]TopicMetadata, int(cMd.topic_cnt)) |
| for i := 0; i < int(cMd.topic_cnt); i++ { |
| t := C._getMetadata_topic_element(cMd, C.int(i)) |
| |
| thisTopic := C.GoString(t.topic) |
| m.Topics[thisTopic] = TopicMetadata{Topic: thisTopic, |
| Error: newError(t.err), |
| Partitions: make([]PartitionMetadata, int(t.partition_cnt))} |
| |
| for j := 0; j < int(t.partition_cnt); j++ { |
| p := C._getMetadata_partition_element(cMd, C.int(i), C.int(j)) |
| m.Topics[thisTopic].Partitions[j] = PartitionMetadata{ |
| ID: int32(p.id), |
| Error: newError(p.err), |
| Leader: int32(p.leader)} |
| m.Topics[thisTopic].Partitions[j].Replicas = make([]int32, int(p.replica_cnt)) |
| for ir := 0; ir < int(p.replica_cnt); ir++ { |
| m.Topics[thisTopic].Partitions[j].Replicas[ir] = int32(C._get_int32_element(p.replicas, C.int(ir))) |
| } |
| |
| m.Topics[thisTopic].Partitions[j].Isrs = make([]int32, int(p.isr_cnt)) |
| for ii := 0; ii < int(p.isr_cnt); ii++ { |
| m.Topics[thisTopic].Partitions[j].Isrs[ii] = int32(C._get_int32_element(p.isrs, C.int(ii))) |
| } |
| } |
| } |
| |
| m.OriginatingBroker = BrokerMetadata{int32(cMd.orig_broker_id), |
| C.GoString(cMd.orig_broker_name), 0} |
| |
| return &m, nil |
| } |
| |
| // queryWatermarkOffsets returns the broker's low and high offsets for the given topic |
| // and partition. |
| func queryWatermarkOffsets(H Handle, topic string, partition int32, timeoutMs int) (low, high int64, err error) { |
| h := H.gethandle() |
| |
| ctopic := C.CString(topic) |
| defer C.free(unsafe.Pointer(ctopic)) |
| |
| var cLow, cHigh C.int64_t |
| |
| e := C.rd_kafka_query_watermark_offsets(h.rk, ctopic, C.int32_t(partition), |
| &cLow, &cHigh, C.int(timeoutMs)) |
| if e != C.RD_KAFKA_RESP_ERR_NO_ERROR { |
| return 0, 0, newError(e) |
| } |
| |
| low = int64(cLow) |
| high = int64(cHigh) |
| return low, high, nil |
| } |