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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
);
}
};
export const handleStartup = async (
mongoUri: string,
hostDir: string,
publicPath: string,
targetUrl: string
): Promise<MongoClient> => {
try {
await fs.promises.access(hostDir, fs.constants.R_OK | fs.constants.W_OK);
if (!path.isAbsolute(hostDir)) {
await Promise.reject("hostDir must be an absolute path");
}
const mongo = await MongoClient.connect(mongoUri, {
useUnifiedTopology: true
}).catch((err: MongoError) =>
Promise.reject(err.message ?? "Unable to connect to database")
);
await persistTemplate({
inputFile: path.join(publicPath, "templates", "bash.template"),
outputFile: path.join(hostDir, "bash"),
context: { targetUrl }
} as Template);
await persistTemplate({
inputFile: path.join(publicPath, "templates", "index.html.template"),
outputFile: path.join(hostDir, "index.html"),
context: { targetUrl }
} 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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