khenaidoo | ac63710 | 2019-01-14 15:44:34 -0500 | [diff] [blame^] | 1 | /** |
| 2 | * Copyright 2016 Confluent Inc. |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package kafka |
| 18 | |
| 19 | import ( |
| 20 | "unsafe" |
| 21 | ) |
| 22 | |
| 23 | /* |
| 24 | #include <stdlib.h> |
| 25 | #include <librdkafka/rdkafka.h> |
| 26 | |
| 27 | struct rd_kafka_metadata_broker *_getMetadata_broker_element(struct rd_kafka_metadata *m, int i) { |
| 28 | return &m->brokers[i]; |
| 29 | } |
| 30 | |
| 31 | struct rd_kafka_metadata_topic *_getMetadata_topic_element(struct rd_kafka_metadata *m, int i) { |
| 32 | return &m->topics[i]; |
| 33 | } |
| 34 | |
| 35 | struct rd_kafka_metadata_partition *_getMetadata_partition_element(struct rd_kafka_metadata *m, int topic_idx, int partition_idx) { |
| 36 | return &m->topics[topic_idx].partitions[partition_idx]; |
| 37 | } |
| 38 | |
| 39 | int32_t _get_int32_element (int32_t *arr, int i) { |
| 40 | return arr[i]; |
| 41 | } |
| 42 | |
| 43 | */ |
| 44 | import "C" |
| 45 | |
| 46 | // BrokerMetadata contains per-broker metadata |
| 47 | type BrokerMetadata struct { |
| 48 | ID int32 |
| 49 | Host string |
| 50 | Port int |
| 51 | } |
| 52 | |
| 53 | // PartitionMetadata contains per-partition metadata |
| 54 | type PartitionMetadata struct { |
| 55 | ID int32 |
| 56 | Error Error |
| 57 | Leader int32 |
| 58 | Replicas []int32 |
| 59 | Isrs []int32 |
| 60 | } |
| 61 | |
| 62 | // TopicMetadata contains per-topic metadata |
| 63 | type TopicMetadata struct { |
| 64 | Topic string |
| 65 | Partitions []PartitionMetadata |
| 66 | Error Error |
| 67 | } |
| 68 | |
| 69 | // Metadata contains broker and topic metadata for all (matching) topics |
| 70 | type Metadata struct { |
| 71 | Brokers []BrokerMetadata |
| 72 | Topics map[string]TopicMetadata |
| 73 | |
| 74 | OriginatingBroker BrokerMetadata |
| 75 | } |
| 76 | |
| 77 | // getMetadata queries broker for cluster and topic metadata. |
| 78 | // If topic is non-nil only information about that topic is returned, else if |
| 79 | // allTopics is false only information about locally used topics is returned, |
| 80 | // else information about all topics is returned. |
| 81 | func getMetadata(H Handle, topic *string, allTopics bool, timeoutMs int) (*Metadata, error) { |
| 82 | h := H.gethandle() |
| 83 | |
| 84 | var rkt *C.rd_kafka_topic_t |
| 85 | if topic != nil { |
| 86 | rkt = h.getRkt(*topic) |
| 87 | } |
| 88 | |
| 89 | var cMd *C.struct_rd_kafka_metadata |
| 90 | cErr := C.rd_kafka_metadata(h.rk, bool2cint(allTopics), |
| 91 | rkt, &cMd, C.int(timeoutMs)) |
| 92 | if cErr != C.RD_KAFKA_RESP_ERR_NO_ERROR { |
| 93 | return nil, newError(cErr) |
| 94 | } |
| 95 | |
| 96 | m := Metadata{} |
| 97 | defer C.rd_kafka_metadata_destroy(cMd) |
| 98 | |
| 99 | m.Brokers = make([]BrokerMetadata, cMd.broker_cnt) |
| 100 | for i := 0; i < int(cMd.broker_cnt); i++ { |
| 101 | b := C._getMetadata_broker_element(cMd, C.int(i)) |
| 102 | m.Brokers[i] = BrokerMetadata{int32(b.id), C.GoString(b.host), |
| 103 | int(b.port)} |
| 104 | } |
| 105 | |
| 106 | m.Topics = make(map[string]TopicMetadata, int(cMd.topic_cnt)) |
| 107 | for i := 0; i < int(cMd.topic_cnt); i++ { |
| 108 | t := C._getMetadata_topic_element(cMd, C.int(i)) |
| 109 | |
| 110 | thisTopic := C.GoString(t.topic) |
| 111 | m.Topics[thisTopic] = TopicMetadata{Topic: thisTopic, |
| 112 | Error: newError(t.err), |
| 113 | Partitions: make([]PartitionMetadata, int(t.partition_cnt))} |
| 114 | |
| 115 | for j := 0; j < int(t.partition_cnt); j++ { |
| 116 | p := C._getMetadata_partition_element(cMd, C.int(i), C.int(j)) |
| 117 | m.Topics[thisTopic].Partitions[j] = PartitionMetadata{ |
| 118 | ID: int32(p.id), |
| 119 | Error: newError(p.err), |
| 120 | Leader: int32(p.leader)} |
| 121 | m.Topics[thisTopic].Partitions[j].Replicas = make([]int32, int(p.replica_cnt)) |
| 122 | for ir := 0; ir < int(p.replica_cnt); ir++ { |
| 123 | m.Topics[thisTopic].Partitions[j].Replicas[ir] = int32(C._get_int32_element(p.replicas, C.int(ir))) |
| 124 | } |
| 125 | |
| 126 | m.Topics[thisTopic].Partitions[j].Isrs = make([]int32, int(p.isr_cnt)) |
| 127 | for ii := 0; ii < int(p.isr_cnt); ii++ { |
| 128 | m.Topics[thisTopic].Partitions[j].Isrs[ii] = int32(C._get_int32_element(p.isrs, C.int(ii))) |
| 129 | } |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | m.OriginatingBroker = BrokerMetadata{int32(cMd.orig_broker_id), |
| 134 | C.GoString(cMd.orig_broker_name), 0} |
| 135 | |
| 136 | return &m, nil |
| 137 | } |
| 138 | |
| 139 | // queryWatermarkOffsets returns the broker's low and high offsets for the given topic |
| 140 | // and partition. |
| 141 | func queryWatermarkOffsets(H Handle, topic string, partition int32, timeoutMs int) (low, high int64, err error) { |
| 142 | h := H.gethandle() |
| 143 | |
| 144 | ctopic := C.CString(topic) |
| 145 | defer C.free(unsafe.Pointer(ctopic)) |
| 146 | |
| 147 | var cLow, cHigh C.int64_t |
| 148 | |
| 149 | e := C.rd_kafka_query_watermark_offsets(h.rk, ctopic, C.int32_t(partition), |
| 150 | &cLow, &cHigh, C.int(timeoutMs)) |
| 151 | if e != C.RD_KAFKA_RESP_ERR_NO_ERROR { |
| 152 | return 0, 0, newError(e) |
| 153 | } |
| 154 | |
| 155 | low = int64(cLow) |
| 156 | high = int64(cHigh) |
| 157 | return low, high, nil |
| 158 | } |