Add Docker Healthcheck (#636)

* Add Docker Healthcheck

Fixes #635

* Update Dockerfile_light

* Update healthcheck.js

fix healthcheck output error: "file:///usr/src/app/src/healthcheck.js:1\nvar http = require(\"http\");\n           ^\n\nReferenceError: require is not defined in ES module scope, you can use import instead\nThis file is being treated as an ES module because it has a '.js' file extension and '/usr/src/app/package.json' contains \"type\": \"module\". To treat it as a CommonJS script, rename it to use the '.cjs' file extension.\n    at file:///usr/src/app/src/healthcheck.js:1:12\n    at ModuleJob.run (node:internal/modules/esm/module_job:193:25)\n    at async Promise.all (index 0)\n    at async ESMLoader.import (node:internal/modules/esm/loader:526:24)\n    at async loadESM (node:internal/process/esm_loader:91:5)\n    at async handleMainPromise (node:internal/modules/run_main:65:12)\n"

* update version

Co-authored-by: acalcutt <acalcutt@techidiots.net>

Author: zstadler

Dockerfile

@@ -81,3 +81,5 @@ EXPOSE 80
 USER node:node
 
 ENTRYPOINT ["/usr/src/app/docker-entrypoint.sh"]
+
+HEALTHCHECK CMD node /usr/src/app/src/healthcheck.js

Dockerfile_light

@@ -32,3 +32,4 @@ COPY / /usr/src/app
 RUN cd /usr/src/app && npm install --omit=dev
 RUN ["chmod", "+x", "/usr/src/app/docker-entrypoint.sh"]
 USER node:node
+HEALTHCHECK CMD node /usr/src/app/src/healthcheck.js

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "tileserver-gl",
-  "version": "4.1.2",
+  "version": "4.1.3",
   "description": "Map tile server for JSON GL styles - vector and server side generated raster tiles",
   "main": "src/main.js",
   "bin": "src/main.js",

package.json

@@ -0,0 +1,18 @@
+import * as http from 'http';
+var options = {
+  timeout: 2000,
+};
+var url = "http://localhost:80/health";
+var request = http.request(url, options, (res) => {
+  console.log(`STATUS: ${res.statusCode}`);
+  if (res.statusCode == 200) {
+    process.exit(0);
+  } else {
+    process.exit(1);
+  }
+});
+request.on("error", function (err) {
+  console.log("ERROR");
+  process.exit(1);
+});
+request.end();