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| 1 | +import { DomainError, assertDomain } from '../domain/errors.ts' |
| 2 | + |
| 3 | +type ClaimWebhookDelivery = (request: { |
| 4 | + workspaceId: string |
| 5 | + leaseOwner: string |
| 6 | +}) => Promise<Readonly<{ |
| 7 | + delivery: Readonly<{ id: string }> |
| 8 | + attempt: Readonly<{ attemptNumber: number }> |
| 9 | + leaseToken: string |
| 10 | +}> | null> |
| 11 | + |
| 12 | +type HeartbeatWebhookDelivery = (request: { |
| 13 | + workspaceId: string |
| 14 | + deliveryId: string |
| 15 | + leaseOwner: string |
| 16 | + leaseToken: string |
| 17 | + attemptNumber: number |
| 18 | +}) => Promise<boolean> |
| 19 | + |
| 20 | +type DispatchWebhookDelivery = (request: { |
| 21 | + workspaceId: string |
| 22 | + deliveryId: string |
| 23 | + leaseOwner: string |
| 24 | + leaseToken: string |
| 25 | + attemptNumber: number |
| 26 | +}) => Promise<Readonly<{ |
| 27 | + status: 'succeeded' | 'retry-scheduled' | 'dead-lettered' | 'stale' |
| 28 | +}>> |
| 29 | + |
| 30 | +export interface WebhookDeliveryWorkerOutcome { |
| 31 | + workspaceId: string |
| 32 | + deliveryId: string |
| 33 | + attemptNumber: number |
| 34 | + status: 'succeeded' | 'retry-scheduled' | 'dead-lettered' | 'lease-lost' |
| 35 | +} |
| 36 | + |
| 37 | +export function runNextWebhookDeliveryService(dependencies: { |
| 38 | + claim: ClaimWebhookDelivery |
| 39 | + heartbeat: HeartbeatWebhookDelivery |
| 40 | + dispatch: DispatchWebhookDelivery |
| 41 | + heartbeatIntervalMs?: number |
| 42 | +}) { |
| 43 | + const heartbeatIntervalMs = dependencies.heartbeatIntervalMs ?? 10_000 |
| 44 | + assertDomain( |
| 45 | + Number.isSafeInteger(heartbeatIntervalMs) && |
| 46 | + heartbeatIntervalMs >= 100 && |
| 47 | + heartbeatIntervalMs <= 60_000, |
| 48 | + 'INVALID_WEBHOOK', |
| 49 | + 'Webhook worker heartbeat interval must be between 100 and 60000 milliseconds', |
| 50 | + ) |
| 51 | + |
| 52 | + return async function runNextWebhookDelivery(request: { |
| 53 | + workspaceId: string |
| 54 | + leaseOwner: string |
| 55 | + }): Promise<Readonly<WebhookDeliveryWorkerOutcome> | null> { |
| 56 | + const claimed = await dependencies.claim(request) |
| 57 | + if (!claimed) return null |
| 58 | + |
| 59 | + const command = { |
| 60 | + workspaceId: request.workspaceId, |
| 61 | + deliveryId: claimed.delivery.id, |
| 62 | + leaseOwner: request.leaseOwner, |
| 63 | + leaseToken: claimed.leaseToken, |
| 64 | + attemptNumber: claimed.attempt.attemptNumber, |
| 65 | + } |
| 66 | + let stopped = false |
| 67 | + let leaseLost = false |
| 68 | + let timer: ReturnType<typeof setTimeout> | undefined |
| 69 | + let renewal: Promise<boolean> | undefined |
| 70 | + |
| 71 | + const heartbeat = async () => { |
| 72 | + if (stopped || leaseLost) return false |
| 73 | + if (renewal) return renewal |
| 74 | + renewal = (async () => { |
| 75 | + try { |
| 76 | + const renewed = await dependencies.heartbeat(command) |
| 77 | + if (!renewed) leaseLost = true |
| 78 | + return renewed |
| 79 | + } catch { |
| 80 | + leaseLost = true |
| 81 | + return false |
| 82 | + } finally { |
| 83 | + renewal = undefined |
| 84 | + } |
| 85 | + })() |
| 86 | + return renewal |
| 87 | + } |
| 88 | + const scheduleHeartbeat = () => { |
| 89 | + if (stopped || leaseLost) return |
| 90 | + timer = setTimeout(async () => { |
| 91 | + await heartbeat() |
| 92 | + scheduleHeartbeat() |
| 93 | + }, heartbeatIntervalMs) |
| 94 | + timer.unref?.() |
| 95 | + } |
| 96 | + const stopHeartbeat = async () => { |
| 97 | + stopped = true |
| 98 | + if (timer) clearTimeout(timer) |
| 99 | + if (renewal) await renewal |
| 100 | + } |
| 101 | + |
| 102 | + try { |
| 103 | + scheduleHeartbeat() |
| 104 | + const dispatched = await dependencies.dispatch(command) |
| 105 | + if (dispatched.status === 'stale') { |
| 106 | + return Object.freeze({ |
| 107 | + workspaceId: command.workspaceId, |
| 108 | + deliveryId: command.deliveryId, |
| 109 | + attemptNumber: command.attemptNumber, |
| 110 | + status: 'lease-lost' as const, |
| 111 | + }) |
| 112 | + } |
| 113 | + return Object.freeze({ |
| 114 | + workspaceId: command.workspaceId, |
| 115 | + deliveryId: command.deliveryId, |
| 116 | + attemptNumber: command.attemptNumber, |
| 117 | + status: dispatched.status, |
| 118 | + }) |
| 119 | + } finally { |
| 120 | + await stopHeartbeat() |
| 121 | + } |
| 122 | + } |
| 123 | +} |
| 124 | + |
| 125 | +const SAFE_ID_PATTERN = /^[A-Za-z0-9][A-Za-z0-9._:-]{2,127}$/ |
| 126 | + |
| 127 | +function normalizeWorkspaceIds(values: readonly string[]): readonly string[] { |
| 128 | + const normalized = values.map((value) => value.trim()) |
| 129 | + assertDomain( |
| 130 | + normalized.length >= 1 && |
| 131 | + normalized.length <= 1_000 && |
| 132 | + normalized.every((value) => SAFE_ID_PATTERN.test(value)) && |
| 133 | + new Set(normalized).size === normalized.length, |
| 134 | + 'INVALID_WEBHOOK', |
| 135 | + 'Webhook worker requires 1 to 1000 unique workspace IDs', |
| 136 | + ) |
| 137 | + return Object.freeze(normalized) |
| 138 | +} |
| 139 | + |
| 140 | +async function waitForPoll(delayMs: number, signal: AbortSignal): Promise<void> { |
| 141 | + if (signal.aborted) return |
| 142 | + await new Promise<void>((resolve) => { |
| 143 | + const timer = setTimeout(done, delayMs) |
| 144 | + timer.unref?.() |
| 145 | + signal.addEventListener('abort', done, { once: true }) |
| 146 | + function done() { |
| 147 | + clearTimeout(timer) |
| 148 | + signal.removeEventListener('abort', done) |
| 149 | + resolve() |
| 150 | + } |
| 151 | + }) |
| 152 | +} |
| 153 | + |
| 154 | +export async function runWebhookDeliveryWorkerLoop(dependencies: { |
| 155 | + runNext: (request: { |
| 156 | + workspaceId: string |
| 157 | + leaseOwner: string |
| 158 | + }) => Promise<Readonly<WebhookDeliveryWorkerOutcome> | null> |
| 159 | + workspaceIds: readonly string[] |
| 160 | + leaseOwner: string |
| 161 | + signal: AbortSignal |
| 162 | + pollIntervalMs?: number |
| 163 | + onOutcome?: (outcome: Readonly<WebhookDeliveryWorkerOutcome>) => void |
| 164 | + onIterationError?: (event: Readonly<{ workspaceId: string }>) => void |
| 165 | + wait?: (delayMs: number, signal: AbortSignal) => Promise<void> |
| 166 | +}): Promise<void> { |
| 167 | + const workspaceIds = normalizeWorkspaceIds(dependencies.workspaceIds) |
| 168 | + const leaseOwner = dependencies.leaseOwner.trim() |
| 169 | + const pollIntervalMs = dependencies.pollIntervalMs ?? 1_000 |
| 170 | + assertDomain( |
| 171 | + SAFE_ID_PATTERN.test(leaseOwner), |
| 172 | + 'INVALID_WEBHOOK', |
| 173 | + 'Webhook worker lease owner is invalid', |
| 174 | + ) |
| 175 | + assertDomain( |
| 176 | + Number.isSafeInteger(pollIntervalMs) && pollIntervalMs >= 100 && pollIntervalMs <= 60_000, |
| 177 | + 'INVALID_WEBHOOK', |
| 178 | + 'Webhook worker poll interval must be between 100 and 60000 milliseconds', |
| 179 | + ) |
| 180 | + const wait = dependencies.wait ?? waitForPoll |
| 181 | + |
| 182 | + while (!dependencies.signal.aborted) { |
| 183 | + let processed = false |
| 184 | + for (const workspaceId of workspaceIds) { |
| 185 | + if (dependencies.signal.aborted) break |
| 186 | + try { |
| 187 | + const outcome = await dependencies.runNext({ workspaceId, leaseOwner }) |
| 188 | + if (outcome) { |
| 189 | + processed = true |
| 190 | + try { |
| 191 | + dependencies.onOutcome?.(outcome) |
| 192 | + } catch { |
| 193 | + // Observability callbacks cannot control delivery execution. |
| 194 | + } |
| 195 | + } |
| 196 | + } catch { |
| 197 | + try { |
| 198 | + dependencies.onIterationError?.(Object.freeze({ workspaceId })) |
| 199 | + } catch { |
| 200 | + // Observability callbacks cannot stop other workspaces. |
| 201 | + } |
| 202 | + } |
| 203 | + } |
| 204 | + if (!processed && !dependencies.signal.aborted) { |
| 205 | + await wait(pollIntervalMs, dependencies.signal) |
| 206 | + } |
| 207 | + } |
| 208 | +} |
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