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| 1 | +import { v4 as uuidv4 } from "uuid"; |
| 2 | +import { Address, mergeAddresses } from "../common/dsn"; |
| 3 | +import logger from "../common/log"; |
| 4 | + |
| 5 | +export class Cluster { |
| 6 | + readonly id: string; |
| 7 | + private _addresses: readonly Address[]; |
| 8 | + |
| 9 | + constructor(addresses: Address[]) { |
| 10 | + this.id = uuidv4(); |
| 11 | + this._addresses = Cluster.freezeAddresses(addresses); |
| 12 | + } |
| 13 | + |
| 14 | + get addresses(): readonly Address[] { |
| 15 | + return this._addresses; |
| 16 | + } |
| 17 | + |
| 18 | + addAddresses(addresses: Address[]): void { |
| 19 | + const merged = mergeAddresses([...this._addresses], addresses); |
| 20 | + this._addresses = Cluster.freezeAddresses(merged); |
| 21 | + } |
| 22 | + |
| 23 | + private static freezeAddresses(addresses: Address[]): readonly Address[] { |
| 24 | + return Object.freeze( |
| 25 | + addresses.map((address) => |
| 26 | + Object.freeze(new Address(address.host, address.port)) |
| 27 | + ) |
| 28 | + ); |
| 29 | + } |
| 30 | +} |
| 31 | + |
| 32 | +export class ClusterRegistry { |
| 33 | + private static _instance?: ClusterRegistry; |
| 34 | + private endpointToCluster: Map<string, Cluster> = new Map(); |
| 35 | + |
| 36 | + private constructor() { } |
| 37 | + |
| 38 | + public static instance(): ClusterRegistry { |
| 39 | + if (!ClusterRegistry._instance) { |
| 40 | + ClusterRegistry._instance = new ClusterRegistry(); |
| 41 | + } |
| 42 | + return ClusterRegistry._instance; |
| 43 | + } |
| 44 | + |
| 45 | + private endpointKey(address: Address): string { |
| 46 | + return `${address.host}:${address.port}`; |
| 47 | + } |
| 48 | + |
| 49 | + private collectMatchedClusters(addresses: Address[]): Map<string, Cluster> { |
| 50 | + const matchedClusters = new Map<string, Cluster>(); |
| 51 | + for (const address of addresses) { |
| 52 | + const cluster = this.endpointToCluster.get(this.endpointKey(address)); |
| 53 | + if (!cluster) { |
| 54 | + continue; |
| 55 | + } |
| 56 | + matchedClusters.set(cluster.id, cluster); |
| 57 | + } |
| 58 | + return matchedClusters; |
| 59 | + } |
| 60 | + |
| 61 | + public getOrCreateCluster(seeds: Address[]): Cluster | null { |
| 62 | + const matchedClusters = this.collectMatchedClusters(seeds); |
| 63 | + if (matchedClusters.size > 1) { |
| 64 | + logger.warn( |
| 65 | + "Adapter HA: seed addresses span multiple known clusters, " + |
| 66 | + "skipping expansion. Ensure all seeds belong to the same cluster." |
| 67 | + ); |
| 68 | + return null; |
| 69 | + } |
| 70 | + if (matchedClusters.size === 1) { |
| 71 | + return matchedClusters.values().next().value as Cluster; |
| 72 | + } |
| 73 | + |
| 74 | + const cluster = new Cluster(seeds); |
| 75 | + for (const seed of seeds) { |
| 76 | + this.endpointToCluster.set(this.endpointKey(seed), cluster); |
| 77 | + } |
| 78 | + return cluster; |
| 79 | + } |
| 80 | + |
| 81 | + public updateCluster(discovered: Address[]): void { |
| 82 | + if (discovered.length === 0) { |
| 83 | + return; |
| 84 | + } |
| 85 | + |
| 86 | + const matchedClusters = this.collectMatchedClusters(discovered); |
| 87 | + if (matchedClusters.size === 0) { |
| 88 | + return; |
| 89 | + } |
| 90 | + |
| 91 | + if (matchedClusters.size > 1) { |
| 92 | + logger.warn( |
| 93 | + "Adapter HA: discovered endpoints match multiple known clusters, skipping update." |
| 94 | + ); |
| 95 | + return; |
| 96 | + } |
| 97 | + |
| 98 | + const cluster = matchedClusters.values().next().value as Cluster; |
| 99 | + cluster.addAddresses(discovered); |
| 100 | + for (const address of discovered) { |
| 101 | + this.endpointToCluster.set(this.endpointKey(address), cluster); |
| 102 | + } |
| 103 | + } |
| 104 | + |
| 105 | + public expandEndpoints(seeds: Address[]): Address[] { |
| 106 | + let matchedCluster: Cluster | null = null; |
| 107 | + |
| 108 | + for (const seed of seeds) { |
| 109 | + const cluster = this.endpointToCluster.get(this.endpointKey(seed)); |
| 110 | + if (!cluster) { |
| 111 | + continue; |
| 112 | + } |
| 113 | + |
| 114 | + if (matchedCluster === null) { |
| 115 | + matchedCluster = cluster; |
| 116 | + continue; |
| 117 | + } |
| 118 | + |
| 119 | + if (matchedCluster.id !== cluster.id) { |
| 120 | + logger.warn( |
| 121 | + "Adapter HA: seed addresses span multiple known clusters, " + |
| 122 | + "skipping expansion. Ensure all seeds belong to the same cluster." |
| 123 | + ); |
| 124 | + return seeds.map((seedAddress) => |
| 125 | + new Address(seedAddress.host, seedAddress.port) |
| 126 | + ); |
| 127 | + } |
| 128 | + } |
| 129 | + |
| 130 | + if (!matchedCluster) { |
| 131 | + return seeds.map((seedAddress) => |
| 132 | + new Address(seedAddress.host, seedAddress.port) |
| 133 | + ); |
| 134 | + } |
| 135 | + |
| 136 | + return mergeAddresses(seeds, [...matchedCluster.addresses]); |
| 137 | + } |
| 138 | +} |
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