[#173] s3: Support variable key length

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

scenarios/libs/keygen.js

@@ -1,17 +1,30 @@
-import {uuidv4} from './k6-utils-1.4.0.js';
+import { uuidv4 } from './k6-utils-1.4.0.js';
 
 export function generateS3Key() {
-    let width = parseInt(__ENV.DIR_WIDTH || '0');
+  let width = parseInt(__ENV.DIR_WIDTH || '0');
-    let height = parseInt(__ENV.DIR_HEIGHT || '0');
+  let height = parseInt(__ENV.DIR_HEIGHT || '0');
 
-    let key = ''
+  let key = ''
-    if (width > 0 && height > 0) {
+  if (width > 0 && height > 0) {
-      for (let index = 0; index < height; index++) {
+    for (let index = 0; index < height; index++) {
-        const w = Math.floor(Math.random() * width) + 1;
+      const w = Math.floor(Math.random() * width) + 1;
-        key = key + 'dir' + w + '/';
+      key = key + 'dir' + w + '/';
-      }
     }
+  }
 
-    key += (__ENV.OBJ_NAME || uuidv4());
+  key += objName();
-    return key;
+  return key;
+}
+
+const asciiLetters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890()"
+
+function objName() {
+  const length = parseInt(__ENV.OBJ_NAME_LENGTH || '0');
+  if (length > 0) {
+    let name = "";
+    for (let i = 0; i < length; i++) {
+      name += asciiLetters.charAt(Math.floor(Math.random() * asciiLetters.length));
+    }
+  }
+  return (__ENV.OBJ_NAME || uuidv4());
 }

scenarios/run_scenarios.md

@@ -138,6 +138,7 @@ Options (in addition to the common options):
   * `DELETE_AGE` - age of object in seconds before which it can not be deleted. This parameter can be used to control how many objects we have in the system under load.
   * `SLEEP_DELETE` - time interval (in seconds) between deleting VU iterations.
   * `OBJ_NAME` - if specified, this name will be used for all write operations instead of random generation.
+  * `OBJ_NAME_LENGTH` - if specified, then name of the object will be generated with the specified length of ASCII characters.
   * `DIR_HEIGHT`, `DIR_WIDTH` - if both specified, object name will consist of `DIR_HEIGHT` directories, each of which can have `DIR_WIDTH` subdirectories, for example for `DIR_HEIGHT = 3, DIR_WIDTH = 100`, object names will be `/dir{1...100}/dir{1...100}/dir{1...100}/{uuid || OBJ_NAME}`
 
 ## S3 Multipart