add cleanup interface

bin/democratic-csi

@@ -486,6 +486,21 @@ const signalMapping = {
         }
       }
 
+      if (driver && typeof driver.getCleanupHandlers === 'function') {
+        const cleanup = driver.getCleanupHandlers();
+        console.log(`running driver ${cleanup.length} cleanup handlers`);
+        for (const c of cleanup) {
+          try {
+            c();
+          } catch (e) {
+            console.log("cleanup handler failed");
+            console.log(e);
+          }
+        }
+      } else {
+        console.log(`current driver does not support cleanup`);
+      }
+
       console.log("server fully shutdown, exiting");
       process.exit(codeNumber);
     });

src/driver/index.js

@@ -33,6 +33,7 @@ class CsiBaseDriver {
   constructor(ctx, options) {
     this.ctx = ctx;
     this.options = options || {};
+    this.cleanup = [];
 
     if (!this.options.hasOwnProperty("node")) {
       this.options.node = {};
@@ -51,6 +52,10 @@ class CsiBaseDriver {
     }
   }
 
+  getCleanupHandlers() {
+    return this.cleanup;
+  }
+
   /**
    * abstract way of retrieving values from parameters/secrets
    * in order of preference: