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import { BotClient } from "@/classes/Client"
import { botLog, botLogError } from "@/utils/botLog"
import {
discordEnv,
resolveDiscordBotRuntimeConfig,
type DiscordBotRuntimeMode,
type DiscordBotShardCount,
} from "@workspace/env/discord"
import {
shutdownDiscordBot,
shutdownDiscordShardingManager,
type DiscordBotShutdownReason,
} from "./shutdown"
import { assertConvexBotRuntimeConfig } from "../services/convexBotClient"
type BotClientRuntime = {
client: Client
start: () => Promise<void>
}
type ProcessLike = Pick<NodeJS.Process, "on" | "once">
type StartBotClientRuntimeOptions = {
mode: DiscordBotRuntimeMode
token?: string
createClient?: () => BotClient
assertRuntimeConfig?: () => void
shutdown?: typeof shutdownDiscordBot
processLike?: ProcessLike
exit?: (code?: number) => void
env?: NodeJS.ProcessEnv
}
type StartShardingManagerRuntimeOptions = {
shardCount: DiscordBotShardCount
token?: string
entrypoint: string
createManager?: (
file: string,
options: ConstructorParameters<typeof ShardingManager>[1]
) => ShardingManager
shutdown?: typeof shutdownDiscordShardingManager
processLike?: ProcessLike
exit?: (code?: number) => void
}
type StartDiscordBotRuntimeFromEnvOptions = {
entrypoint: string
env?: NodeJS.ProcessEnv
resolveRuntimeConfig?: typeof resolveDiscordBotRuntimeConfig
startClientRuntime?: typeof startBotClientRuntime
startManagerRuntime?: typeof startShardingManagerRuntime
}
const shutdownHandlerTargets = new WeakSet<ProcessLike>()
export async function startDiscordBotRuntimeFromEnv({
entrypoint,
env = process.env,
resolveRuntimeConfig = resolveDiscordBotRuntimeConfig,
startClientRuntime = startBotClientRuntime,
startManagerRuntime = startShardingManagerRuntime,
}: StartDiscordBotRuntimeFromEnvOptions): Promise<void> {
if (isDiscordShardingWorker(env)) {
await startClientRuntime({
mode: "sharded",
token: env.DISCORD_BOT_TOKEN,
env,
})
return
}
const runtimeConfig = resolveRuntimeConfig(env)
if (runtimeConfig.mode === "single") {
await startClientRuntime({
mode: "single",
token: env.DISCORD_BOT_TOKEN,
env,
})
return
}
await startManagerRuntime({
shardCount: runtimeConfig.shardCount,
token: env.DISCORD_BOT_TOKEN,
entrypoint,
})
}
export async function startBotClientRuntime({
mode,
token = discordEnv.DISCORD_BOT_TOKEN,
createClient = () => new BotClient(),
assertRuntimeConfig = assertConvexBotRuntimeConfig,
shutdown = shutdownDiscordBot,
processLike = process,
exit = process.exit,
env = process.env,
}: StartBotClientRuntimeOptions): Promise<Client> {
assertDiscordBotToken(token)
const client = createBotClientRuntime({
token,
createClient,
assertRuntimeConfig,
})
installShutdownHandlers({
processLike,
shutdown(reason, exitCode, error) {
void shutdown({
client: client.client,
reason,
exitCode,
error,
exit,
})
},
})
try {
botLog(formatBotClientRuntimeMessage(mode, env), "info")
await client.start()
return client.client
} catch (error) {
await shutdown({
client: client.client,
reason: "startupFailure",
exitCode: 1,
error,
exit,
})
throw error
}
}
export async function startShardingManagerRuntime({
shardCount,
token = discordEnv.DISCORD_BOT_TOKEN,
entrypoint,
createManager = (file, options) => new ShardingManager(file, options),
shutdown = shutdownDiscordShardingManager,
processLike = process,
exit = process.exit,
}: StartShardingManagerRuntimeOptions): Promise<ShardingManager> {
assertDiscordBotToken(token)
const manager = createManager(entrypoint, {
execArgv: resolveShardExecArgv(entrypoint),
token,
totalShards: shardCount,
respawn: true,
})
manager.on("shardCreate", (shard) => logShardCreate(shard))
installShutdownHandlers({
processLike,
shutdown(reason, exitCode, error) {
void shutdown({
manager,
reason,
exitCode,
error,
exit,
})
},
})
try {
botLog(
`Discord bot runtime mode: sharded (shardCount=${String(shardCount)})`,
"info"
)
await manager.spawn()
return manager
} catch (error) {
await shutdown({
manager,
reason: "startupFailure",
exitCode: 1,
error,
exit,
})
throw error
}
}
export function resolveShardExecArgv(entrypoint: string): string[] {
return entrypoint.endsWith(".ts") ? ["--import", "tsx"] : []
}
export function isDiscordShardingWorker(
env: NodeJS.ProcessEnv = process.env
): boolean {
return env.SHARDING_MANAGER === "true" && env.SHARDS !== undefined
}
function createBotClientRuntime({
token,
createClient,
assertRuntimeConfig,
}: {
token: string | undefined
createClient: () => BotClient
assertRuntimeConfig: () => void
}): BotClientRuntime {
const client = createClient()
return {
client,
async start() {
assertRuntimeConfig()
await client.start(token)
},
}
}
function installShutdownHandlers({
processLike,
shutdown,
}: {
processLike: ProcessLike
shutdown: (
reason: DiscordBotShutdownReason,
exitCode: number,
error?: unknown
) => void
}): void {
if (shutdownHandlerTargets.has(processLike)) {
return
}
shutdownHandlerTargets.add(processLike)
let shutdownStarted = false
function shutdownOnce(
reason: DiscordBotShutdownReason,
exitCode: number,
error?: unknown
): void {
if (shutdownStarted) {
return
}
shutdownStarted = true
shutdown(reason, exitCode, error)
}
processLike.once("SIGINT", () => shutdownOnce("SIGINT", 0))
processLike.once("SIGTERM", () => shutdownOnce("SIGTERM", 0))
processLike.on("unhandledRejection", (reason) =>
shutdownOnce("unhandledRejection", 1, reason)
)
processLike.on("uncaughtException", (error) =>
shutdownOnce("uncaughtException", 1, error)
)
}
function assertDiscordBotToken(
token: string | undefined
): asserts token is string {
if (!token) {
throw new Error("Missing environment variable DISCORD_BOT_TOKEN")
}
}
function formatBotClientRuntimeMessage(
mode: DiscordBotRuntimeMode,
env: NodeJS.ProcessEnv
): string {
if (mode === "single") {
return "Discord bot runtime mode: single"
}
return `Discord bot runtime mode: sharded worker (shards=${env.SHARDS ?? "unknown"}, shardCount=${env.SHARD_COUNT ?? "unknown"})`
}
function logShardCreate(shard: Shard): void {
botLog(`Created Discord shard ${shard.id}.`, "info")
shard.on("error", (error) => {
botLogError("Discord shard emitted an error.", error, {
shardId: shard.id,
})
})
}
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