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import winston from "winston";
import { MongoClient, MongoError } from "mongodb";
import { Server } from "http";
import path from "path";
import fs from "fs";
import loggerConfig from "./logger";
import processTemplate, { Template } from "../templates";
const logger = winston.createLogger(loggerConfig("ROOT"));
export const configOrError = (varName: string): string => {
const value = process.env[varName];
if (value !== undefined) {
return value;
} else {
logger.error("%s must be defined", varName);
process.exit(1);
}
};
export const persistTemplate = async (input: Template): Promise<void> => {
try {
const template = await processTemplate(input);
logger.debug("Generated '%s' from template file", template.outputFile);
} catch (err1) {
try {
await fs.promises.access(input.outputFile, fs.constants.R_OK);
} catch (err2) {
logger.error(
"Error while generating '%s' from template file: %s",
input.outputFile,
err1
);
logger.error("Cannot proceed due to error: %s", err2);
process.exit(1);
}
// if the output file exists, then we are fine with continuing without
logger.warn(
"Could not generate '%s' from template file, but file already exists: %s",
input.outputFile,
err1
);
}
};
const MONGO_URI = configOrError("MONGO_URI");
const TARGET_URL = process.env.TARGET_URL ?? "http://localhost:3000";
const HOST_DIR = configOrError("HOST_DIR");
export const handleStartup = async (): Promise<MongoClient> => {
try {
await fs.promises.access(HOST_DIR, fs.constants.R_OK | fs.constants.W_OK);
if (!path.isAbsolute(HOST_DIR)) {
logger.error("HOST_DIR must be an absolute path");
process.exit(1);
}
const mongo = await new MongoClient(MONGO_URI, { useUnifiedTopology: true })
.connect()
.catch((err: MongoError) => {
logger.error(err.message ?? "Unable to connect to database");
process.exit(1);
});
await persistTemplate({
inputFile: path.join(
__dirname,
"..",
"..",
"public",
"templates",
"bash.template"
),
outputFile: path.join(HOST_DIR, "bash"),
context: { TARGET_URL }
} as Template);
await persistTemplate({
inputFile: path.join(
__dirname,
"..",
"..",
"public",
"templates",
"index.html.template"
),
outputFile: path.join(HOST_DIR, "index.html"),
context: { TARGET_URL }
} as Template);
return mongo;
} catch (err) {
logger.error("Error occurred during startup: %s", err);
process.exit(1);
}
};
export const handleShutdown = (mongo: MongoClient, server: Server) => (
signal: NodeJS.Signals
): Promise<void> => {
logger.warn("%s signal received. Closing shop.", signal);
return mongo
.close()
.then(() => {
logger.info("MongoDB client connection closed.");
return new Promise((res, rej) =>
server.close(err => {
logger.info("Express down.");
(err ? rej : res)(err);
})
);
})
.then(() => process.exit(0))
.catch(() => process.exit(1));
};
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