Add remote node feature

Author: yottahmd

README.md

@@ -63,6 +63,8 @@ Dagu is a powerful Cron alternative that comes with a Web UI. It allows you to d
     -   [3. Edit the DAG](#3-edit-the-dag)
     -   [4. Execute the DAG](#4-execute-the-dag)
 -   [**CLI**](#cli)
+-   [**Remote Node Management support**](#remote-node-management-support)
+    -   [Configuration](#configuration)
 -   [**Localized Documentation**](#localized-documentation)
 -   [**Documentation**](#documentation)
 -   [**Running as a daemon**](#running-as-a-daemon)
@@ -92,6 +94,10 @@ Dagu is a powerful Cron alternative that comes with a Web UI. It allows you to d
     -   Sending emails
     -   Running jq command
     -   Executing remote commands via SSH
+-   Remote Node support for managing multiple Dagu instances:
+    -   Monitor DAGs across different environments
+    -   Switch between nodes through UI dropdown
+    -   Centralized management interface
 -   Email notification
 -   Scheduling with Cron expressions
 -   REST API Interface
@@ -253,6 +259,29 @@ dagu scheduler [--dags=<path to directory>]
 dagu version
 ```
 
+## **Remote Node Management support**
+
+Dagu supports managing multiple Dagu servers from a single UI through its remote node feature. This allows you to:
+
+-   Monitor and manage DAGs across different environments (dev, staging, prod)
+-   Access multiple Dagu instances from a centralized UI
+-   Switch between nodes easily through the UI dropdown
+
+See [Remote Node Configuration](https://dagu.readthedocs.io/en/latest/config_remote.html) for more details.
+
+### Configuration
+
+Remote nodes can be configured by creating `admin.yaml` in `$HOME/.config/dagu/`:
+
+```yaml
+# admin.yaml
+remoteNodes:
+    - name: "prod" # Name of the remote node
+      apiBaseUrl: "https://prod.example.com/api/v1" # Base URL of the remote node API
+    - name: "staging"
+      apiBaseUrl: "https://staging.example.com/api/v1"
+```
+
 ## **Localized Documentation**
 
 -   [中文文档 (Chinese Documentation)](https://dagu.readthedocs.io/zh)
@@ -289,6 +318,7 @@ dagu version
     -   [JSON Processing](https://dagu.readthedocs.io/en/latest/examples.html#querying-json-data-with-jq)
     -   [Email](https://dagu.readthedocs.io/en/latest/examples.html#sending-email)
 -   [Configurations](https://dagu.readthedocs.io/en/latest/config.html)
+-   [Remote Node](https://dagu.readthedocs.io/en/latest/config_remote.html)
 -   [Scheduler](https://dagu.readthedocs.io/en/latest/scheduler.html)
 -   [Docker Compose](https://dagu.readthedocs.io/en/latest/docker-compose.html)
 -   [REST API Documentation](https://app.swaggerhub.com/apis/YOHAMTA_1/dagu)

docs/source/config_remote.rst

@@ -0,0 +1,42 @@
+.. _Remote Node Configuration:
+
+Remote Node
+===========
+
+.. contents::
+    :local:
+
+Introduction
+-------------
+Dagu UI can be configured to connect to remote nodes, allowing management of DAGs across different environments from a single interface.
+
+How to configure
+----------------
+Create ``admin.yaml`` in ``$HOME/.config/dagu/`` to configure remote nodes. Example configuration:
+
+.. code-block:: yaml
+
+    # Remote Node Configuration
+    remoteNodes:
+    - name: "dev"                                # name of the remote node
+      apiBaseUrl: "http://localhost:8080/api/v1" # Base API URL of the remote node it must end with /api/v1
+
+      # Authentication settings for the remote node
+      # Basic authentication
+      isBasicAuth: true              # Enable basic auth (optional)
+      basicAuthUsername: "admin"     # Basic auth username (optional)
+      basicAuthPassword: "secret"    # Basic auth password (optional)
+
+      # api token authentication
+      isAuthToken: true              # Enable API token (optional)
+      authToken: "your-secret-token" # API token value (optional)
+
+Using Remote Nodes
+-----------------
+Once configured, remote nodes can be selected from the dropdown menu in the top right corner of the UI. This allows you to:
+
+- Switch between different environments
+- View and manage DAGs on remote nodes
+- Monitor execution status across nodes
+
+The UI will maintain all functionality while operating on the selected remote node.

docs/source/index.rst

@@ -44,6 +44,9 @@ Quick Start
 :ref:`Configuration Options`
    Configuration options.
 
+:ref:`Remote Node Configuration`
+   Remote Node Configuration.
+
 .. toctree::
    :caption: Installation
    :hidden:
@@ -75,6 +78,7 @@ Quick Start
    :hidden:
 
    config
+   config_remote
    scheduler
    auth
    email

go.mod

@@ -1,6 +1,6 @@
 module github.com/dagu-org/dagu
 
-go 1.22.5
+go 1.23
 
 require (
 	github.com/adrg/xdg v0.5.0

internal/config/config.go

@@ -32,6 +32,7 @@ import (
 
 // Config represents the configuration for the server.
 type Config struct {
+	RemoteNodes           []RemoteNode   // Remote node API URLs (e.g., http://localhost:8080/api/v1)
 	Host                  string         // Server host
 	Port                  int            // Server port
 	DAGs                  string         // Location of DAG files
@@ -62,6 +63,18 @@ type Config struct {
 	MaxDashboardPageLimit int            // The default page limit for the dashboard
 }
 
+// RemoteNode is the configuration for a remote host that can be proxied by the server.
+// This is useful for fetching data from a remote host and displaying it on the server.
+type RemoteNode struct {
+	Name              string // Name of the remote host
+	APIBaseURL        string // Base URL for the remote host API (e.g., http://localhost:9090/api/v1)
+	IsBasicAuth       bool   // Enable basic auth
+	BasicAuthUsername string // Basic auth username
+	BasicAuthPassword string // Basic auth password
+	IsAuthToken       bool   // Enable auth token for API
+	AuthToken         string // Auth token for API
+}
+
 type TLS struct {
 	CertFile string
 	KeyFile  string