Add db.getMany(keys)

Ref Level/community#101

README.md

@@ -15,7 +15,7 @@
 
 `deferred-leveldown` implements the basic [abstract-leveldown](https://github.com/Level/abstract-leveldown) API so it can be used as a drop-in replacement where `leveldown` is needed.
 
-`put()`, `get()`, `del()`, `batch()` and `clear()` operations are all queued and kept in memory until the `abstract-leveldown`-compatible object has been opened through `deferred-leveldown`'s `open()` method.
+`put()`, `get()`, `getMany()`, `del()`, `batch()` and `clear()` operations are all queued and kept in memory until the `abstract-leveldown`-compatible object has been opened through `deferred-leveldown`'s `open()` method.
 
 `batch()` operations will all be replayed as the array form. Chained-batch operations are converted before being stored.
 

deferred-leveldown.js

@@ -3,8 +3,8 @@
 const AbstractLevelDOWN = require('abstract-leveldown').AbstractLevelDOWN
 const inherits = require('inherits')
 const DeferredIterator = require('./deferred-iterator')
-const deferrables = 'put get del batch clear'.split(' ')
-const optionalDeferrables = 'approximateSize compactRange'.split(' ')
+const deferrables = ['put', 'get', 'getMany', 'del', 'batch', 'clear']
+const optionalDeferrables = ['approximateSize', 'compactRange']
 
 function DeferredLevelDOWN (db) {
   AbstractLevelDOWN.call(this, db.supports || {})

package.json

@@ -20,15 +20,15 @@
     "UPGRADING.md"
   ],
   "dependencies": {
-    "abstract-leveldown": "^7.0.0",
+    "abstract-leveldown": "^7.2.0",
     "inherits": "^2.0.3"
   },
   "devDependencies": {
     "airtap": "^4.0.3",
     "airtap-playwright": "^1.0.1",
     "dependency-check": "^3.3.0",
     "hallmark": "^3.1.0",
-    "memdown": "^6.0.0",
+    "memdown": "^6.1.0",
     "nyc": "^15.1.0",
     "reachdown": "^1.0.0",
     "standard": "^16.0.3",

test.js

@@ -17,13 +17,15 @@ const testCommon = suite.common({
   createIfMissing: false,
   errorIfExists: false,
 
-  // Opt-in to new clear() tests
-  clear: true
+  // Opt-in to new tests
+  clear: true,
+  getMany: true
 })
 
 // Hack: disable failing tests. These fail on serialize tests
 require('abstract-leveldown/test/put-test').args = noop
 require('abstract-leveldown/test/get-test').args = noop
+require('abstract-leveldown/test/get-many-test').args = noop
 require('abstract-leveldown/test/del-test').args = noop
 
 // This fails on "iterator has db reference" test, as expected because
@@ -235,7 +237,7 @@ test('keys and values should not be serialized', function (t) {
 
   function noop () {}
 
-  t.plan(8)
+  t.plan(9)
 
   t.test('put', function (t) {
     const calls = []
@@ -261,6 +263,17 @@ test('keys and values should not be serialized', function (t) {
     })
   })
 
+  t.test('getMany', function (t) {
+    const calls = []
+    const ld = Db('getMany', function (keys, cb) { calls.push(keys[0]) })
+    ITEMS.forEach(function (key) { ld.getMany([key], noop) })
+    ld.open(function (err) {
+      t.error(err, 'no error')
+      t.same(calls, ITEMS, 'value ok')
+      t.end()
+    })
+  })
+
   t.test('del', function (t) {
     const calls = []
     const ld = Db('del', function (key, cb) { calls.push(key) })