fix: docker hosts and ports env variable wrongly used (#2050)

* fix: docker hosts and ports env variable wrongly used

* fix: ci issues

packages/docker/src/env.ts

@@ -0,0 +1,18 @@
+import { createEnv } from "@t3-oss/env-nextjs";
+import { z } from "zod";
+
+import { shouldSkipEnvValidation } from "@homarr/common/env-validation";
+
+export const env = createEnv({
+  server: {
+    // Comma separated list of docker hostnames that can be used to connect to query the docker endpoints (localhost:2375,host.docker.internal:2375, ...)
+    DOCKER_HOSTNAMES: z.string().optional(),
+    DOCKER_PORTS: z.string().optional(),
+  },
+  runtimeEnv: {
+    DOCKER_HOSTNAMES: process.env.DOCKER_HOSTNAMES,
+    DOCKER_PORTS: process.env.DOCKER_PORTS,
+  },
+  skipValidation: shouldSkipEnvValidation(),
+  emptyStringAsUndefined: true,
+});

packages/docker/src/index.ts

@@ -0,0 +1,10 @@
+import type Docker from "dockerode";
+
+export type { DockerInstance } from "./singleton";
+export { DockerSingleton } from "./singleton";
+export type { ContainerInfo, Container, Port } from "dockerode";
+export type { Docker };
+
+export const containerStates = ["created", "running", "paused", "restarting", "exited", "removing", "dead"] as const;
+
+export type ContainerState = (typeof containerStates)[number];

packages/docker/src/singleton.ts

@@ -0,0 +1,53 @@
+import Docker from "dockerode";
+
+import { env } from "./env";
+
+export interface DockerInstance {
+  host: string;
+  instance: Docker;
+}
+
+export class DockerSingleton {
+  private static instances: DockerInstance[] | null = null;
+
+  private createInstances() {
+    const hostVariable = env.DOCKER_HOSTNAMES;
+    const portVariable = env.DOCKER_PORTS;
+    if (hostVariable === undefined || portVariable === undefined) {
+      return [{ host: "socket", instance: new Docker() }];
+    }
+    const hostnames = hostVariable.split(",");
+    const ports = portVariable.split(",");
+
+    if (hostnames.length !== ports.length) {
+      throw new Error("The number of hosts and ports must match");
+    }
+
+    return hostnames.map((host, i) => {
+      // Check above ensures that ports[i] is not undefined
+      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+      const port = ports[i]!;
+
+      return {
+        host: `${host}:${port}`,
+        instance: new Docker({
+          host,
+          port: parseInt(port, 10),
+        }),
+      };
+    });
+  }
+
+  public static findInstance(host: string): DockerInstance | undefined {
+    return this.instances?.find((instance) => instance.host === host);
+  }
+
+  public static getInstances(): DockerInstance[] {
+    if (this.instances) {
+      return this.instances;
+    }
+
+    this.instances = new DockerSingleton().createInstances();
+    return this.instances;
+  }
+}