add default config

src/config.ts

@@ -0,0 +1,50 @@
+import "dotenv/config";
+import { z } from 'zod';
+import { Option, program } from "commander";
+
+import pkg from "../package.json";
+
+export const DEFAULT_PORT = "8080";
+export const DEFAULT_HOSTNAME = "localhost";
+export const DEFAULT_HOST = "http://localhost:8123";
+export const DATABASE_SUFFIX = "token_v1"; // API will use {chain}_{DATABASE_SUFFIX} as the database name
+export const DEFAULT_USERNAME = "default";
+export const DEFAULT_PASSWORD = "default";
+export const DEFAULT_MAX_LIMIT = 10000;
+export const DEFAULT_VERBOSE = true;
+export const DEFAULT_SORT_BY = "DESC";
+export const APP_NAME = pkg.name;
+export const APP_VERSION = {
+    version: pkg.version,
+    commit: process.env.APP_VERSION || "unknown"
+};
+
+// parse command line options
+const opts = program
+    .name(pkg.name)
+    .version(`${APP_VERSION.version}+${APP_VERSION.commit}`)
+    .description(pkg.description)
+    .showHelpAfterError()
+    .addOption(new Option("-p, --port <number>", "HTTP port on which to attach the API").env("PORT").default(DEFAULT_PORT))
+    .addOption(new Option("--hostname <string>", "Server listen on HTTP hostname").env("HOSTNAME").default(DEFAULT_HOSTNAME))
+    .addOption(new Option("--host <string>", "Database HTTP hostname").env("HOST").default(DEFAULT_HOST))
+    .addOption(new Option("--database <string>", "The database suffix to use inside ClickHouse for {chain}_{database}").env("DATABASE").default(`eth_${DATABASE_SUFFIX}`))
+    .addOption(new Option("--username <string>", "Database user").env("USERNAME").default(DEFAULT_USERNAME))
+    .addOption(new Option("--password <string>", "Password associated with the specified username").env("PASSWORD").default(DEFAULT_PASSWORD))
+    .addOption(new Option("--max-limit <number>", "Maximum LIMIT queries").env("MAX_LIMIT").default(DEFAULT_MAX_LIMIT))
+    .addOption(new Option("-v, --verbose <boolean>", "Enable verbose logging").choices(["true", "false"]).env("VERBOSE").default(DEFAULT_VERBOSE))
+
+    .parse()
+    .opts();
+
+export const config = z.object({
+    port: z.string(),
+    hostname: z.string(),
+    host: z.string(),
+    database: z.string(),
+    username: z.string(),
+    password: z.string(),
+    maxLimit: z.coerce.number(),
+    verbose: z.coerce.boolean(),
+}).parse(opts);
+