Merge pull request #103 from FlowFuse/persistent-storage

Persistent storage - Docker

README.md

@@ -15,12 +15,17 @@ driver:
     registry: containers.flowforge.com
     privateCA: /full/path/to/chain.pem
     logPassthrough: true
+    storage:
+      enabled: true
+      path: /opt/flowfuse/storage
 ```
 
  - `registry` is the Docker Registry to load Stack Containers from (default: Docker Hub)
  - `socket` is the path to the docker unix domain socket (default: /var/run/docker.sock)
  - `privateCA`: is the fully qualified path to a pem file containing trusted CA cert chain (default: not set)
  - `logPassthrough` Have Node-RED logs printed in JSON format to container stdout (default: false)
+ - `storage.enabled` enables mounting a directory into each Node-RED instance as persistence storage (default: false)
+ - `storage.path` is the fully qualified path to the root directory for the storage on the host (default: not set)
 
 ### Configuration via environment variables
 

docker.js

@@ -1,5 +1,7 @@
 const got = require('got')
 const Docker = require('dockerode')
+const path = require('path')
+const { chownSync, mkdirSync, rmSync } = require('fs')
 
 const createContainer = async (project, domain) => {
     const stack = project.ProjectStack.properties
@@ -99,6 +101,25 @@ const createContainer = async (project, domain) => {
         contOptions.Env.push('NODE_EXTRA_CA_CERTS=/usr/local/ssl-certs/chain.pem')
     }
 
+    if (this._app.config.driver.options?.storage?.enabled || this._app.config.driver.options?.storage?.path) {
+        try {
+            const localPath = path.join('/opt/persistent-storage', project.id)
+            console.log(`Creating dir in container ${localPath}`)
+            mkdirSync(localPath)
+            chownSync(localPath, 1000, 1000)
+        } catch (err) {
+            this._app.log.info(`[docker] problem creating persistent storage for ${project.id}`)
+        }
+        const projectPath = path.join(this._app.config.driver.options?.storage?.path, project.id)
+        if (Array.isArray(contOptions.HostConfig?.Binds)) {
+            contOptions.HostConfig.Binds.push(`${projectPath}:/data/storage`)
+        } else {
+            contOptions.HostConfig.Binds = [
+                `${projectPath}:/data/storage`
+            ]
+        }
+    }
+
     const containerList = await this._docker.listImages()
     let containerFound = false
     let stackName = stack.container
@@ -342,6 +363,16 @@ module.exports = {
                 await container.remove()
             } catch (err) {}
         }
+        if (this._app.config.driver.options?.storage?.enabled) {
+            // need to be sure we have permission to delete the dir and it's contents?
+            try {
+                // This is better and assumes that directory is mounted on `/opt/storage`
+                const projectPersistentPath = path.join('/opt/persistent-storage', project.id)
+                rmSync(projectPersistentPath, { recursive: true, force: true })
+            } catch (err) {
+                this._app.log.error(`[docker] Project ${project.id} - error deleting persistent storage: ${err.stack}`)
+            }
+        }
         delete this._projects[project.id]
     },
     /**