Merge pull request #61 from Level/greenkeeper/initial

.gitignore

@@ -1,2 +1,3 @@
 node_modules
 .nyc_output/
+coverage/

README.md

@@ -59,7 +59,7 @@ sub(db, 'one', { valueEncoding: 'json' })
 sub(db, 'two', { keyEncoding: 'binary' })
 ```
 
-There is one limitation, however: keys must _encode to_ either strings or Buffers. This is not likely to affect you, unless you use custom encodings or the `id` encoding (which bypasses encodings and thus makes it your responsibility to ensure keys are either strings or Buffers).
+There is one limitation, however: keys must _encode to_ either strings or Buffers. This is not likely to affect you, unless you use custom encodings or the `id` encoding (which bypasses encodings and thus makes it your responsibility to ensure keys are either strings or Buffers). If in that case you do pass in a key that is not a string or Buffer, it will be irreversibly converted to a string.
 
 Authored by [@mafintosh](https://github.com/mafintosh) and inspired by [`level-sublevel`][level-sublevel] by [@dominictarr](https://github.com/dominictarr), `subleveldown` has become an official part of [Level][level-org]. As `level-sublevel` is no longer under active development, we recommend switching to `subleveldown` to get the latest and greatest of the Level ecosystem. These two modules largely offer the same functionality, except for [hooks](https://github.com/dominictarr/level-sublevel#hooks) and [per-batch prefixes](https://github.com/dominictarr/level-sublevel#batches).
 

example.js

@@ -2,10 +2,10 @@ var sub = require('./')
 var levelup = require('levelup')
 var memdown = require('memdown')
 
-var db = levelup('test', {db: memdown})
+var db = levelup('test', { db: memdown })
 
-var test = sub(db, 'test', {valueEncoding: 'utf-8', separator: '@'})
-var test2 = sub(test, 'tester', {valueEncoding: 'utf-8', separator: '@'})
+var test = sub(db, 'test', { valueEncoding: 'utf-8', separator: '@' })
+var test2 = sub(test, 'tester', { valueEncoding: 'utf-8', separator: '@' })
 
 test.put('hi', 'der')
 test.put('hello', ['world'], function () {

leveldown.js

@@ -12,11 +12,11 @@ function concat (prefix, key, force) {
   return key
 }
 
-function SubIterator (ite, prefix) {
+function SubIterator (db, ite, prefix) {
   this.iterator = ite
   this.prefix = prefix
 
-  abstract.AbstractIterator.call(this)
+  abstract.AbstractIterator.call(this, db)
 }
 
 inherits(SubIterator, abstract.AbstractIterator)
@@ -36,7 +36,7 @@ SubIterator.prototype._end = function (cb) {
 
 function SubDown (db, prefix, opts) {
   if (!(this instanceof SubDown)) return new SubDown(db, prefix, opts)
-  if (typeof opts === 'string') opts = {separator: opts}
+  if (typeof opts === 'string') opts = { separator: opts }
   if (!opts) opts = {}
 
   var separator = opts.separator
@@ -63,7 +63,7 @@ function SubDown (db, prefix, opts) {
     }
   }
 
-  abstract.AbstractLevelDOWN.call(this, 'no-location')
+  abstract.AbstractLevelDOWN.call(this)
 }
 
 inherits(SubDown, abstract.AbstractLevelDOWN)
@@ -94,6 +94,10 @@ SubDown.prototype._close = function (cb) {
   this.leveldown.close(cb)
 }
 
+SubDown.prototype._serializeKey = function (key) {
+  return Buffer.isBuffer(key) ? key : String(key)
+}
+
 SubDown.prototype._put = function (key, value, opts, cb) {
   this.leveldown.put(concat(this.prefix, key), value, opts, cb)
 }
@@ -107,16 +111,12 @@ SubDown.prototype._del = function (key, opts, cb) {
 }
 
 SubDown.prototype._batch = function (operations, opts, cb) {
-  if (arguments.length === 0) return new abstract.AbstractChainedBatch(this)
-  if (!Array.isArray(operations)) return this.leveldown.batch.apply(null, arguments)
-
-  var subops = new Array(operations.length)
+  // No need to make a copy of the array, abstract-leveldown does that
   for (var i = 0; i < operations.length; i++) {
-    var o = operations[i]
-    subops[i] = {type: o.type, key: concat(this.prefix, o.key), value: o.value}
+    operations[i].key = concat(this.prefix, operations[i].key)
   }
 
-  this.leveldown.batch(subops, opts, cb)
+  this.leveldown.batch(operations, opts, cb)
 }
 
 function extend (xopts, opts) {
@@ -137,12 +137,12 @@ function extend (xopts, opts) {
 }
 
 function fixRange (opts) {
-  return (!opts.reverse || (!opts.end && !opts.start)) ? opts : {start: opts.end, end: opts.start}
+  return (!opts.reverse || (!opts.end && !opts.start)) ? opts : { start: opts.end, end: opts.start }
 }
 
 SubDown.prototype._iterator = function (opts) {
   var xopts = extend(wrap(fixRange(opts), this._wrap), opts)
-  return new SubIterator(this.leveldown.iterator(xopts), this.prefix)
+  return new SubIterator(this, this.leveldown.iterator(xopts), this.prefix)
 }
 
 module.exports = SubDown

package.json

@@ -16,20 +16,20 @@
     "test": "test"
   },
   "dependencies": {
-    "abstract-leveldown": "^5.0.0",
-    "encoding-down": "^5.0.3",
+    "abstract-leveldown": "^6.0.2",
+    "encoding-down": "^6.0.1",
     "inherits": "^2.0.3",
     "level-option-wrap": "^1.1.0",
-    "levelup": "^3.0.1"
+    "levelup": "^4.0.1"
   },
   "devDependencies": {
     "coveralls": "^3.0.2",
     "dependency-check": "^3.3.0",
     "hallmark": "^0.1.0",
     "level-community": "^3.0.0",
-    "memdown": "^3.0.0",
-    "nyc": "^12.0.2",
-    "standard": "^11.0.1",
+    "memdown": "^4.0.0",
+    "nyc": "^13.3.0",
+    "standard": "^12.0.1",
     "tape": "^4.9.0"
   },
   "hallmark": {

test/index.js

@@ -1,23 +1,38 @@
 var test = require('tape')
+var suite = require('abstract-leveldown/test')
 var memdown = require('memdown')
 var encoding = require('encoding-down')
 var subdown = require('../leveldown')
 var subdb = require('..')
 var levelup = require('levelup')
-var testCommon = require('./common')
-
-require('abstract-leveldown/abstract/open-test').args(down, test, testCommon)
-require('abstract-leveldown/abstract/open-test').open(down, test, testCommon)
-require('abstract-leveldown/abstract/del-test').all(down, test, testCommon)
-require('abstract-leveldown/abstract/get-test').all(down, test, testCommon)
-require('abstract-leveldown/abstract/put-test').all(down, test, testCommon)
-require('abstract-leveldown/abstract/put-get-del-test').all(down, test, testCommon)
-require('abstract-leveldown/abstract/batch-test').all(down, test, testCommon)
-require('abstract-leveldown/abstract/chained-batch-test').all(down, test, testCommon)
-require('abstract-leveldown/abstract/close-test').close(down, test, testCommon)
-require('abstract-leveldown/abstract/iterator-test').all(down, test, testCommon)
-require('abstract-leveldown/abstract/iterator-range-test').all(down, test, testCommon)
 
+// Test abstract-leveldown compliance
+suite({
+  test: test,
+  factory: function () {
+    return subdown(levelup(memdown()), 'test')
+  },
+
+  // Unsupported features
+  seek: false,
+  createIfMissing: false,
+  errorIfExists: false
+})
+
+// Test without a user-provided levelup layer
+suite({
+  test: test,
+  factory: function () {
+    return subdown(memdown(), 'test')
+  },
+
+  // Unsupported features
+  seek: false,
+  createIfMissing: false,
+  errorIfExists: false
+})
+
+// Additional tests for this implementation
 test('SubDown constructor', function (t) {
   t.test('can be called without new', function (t) {
     var sub = subdown()
@@ -72,6 +87,24 @@ test('SubDb main function', function (t) {
     })
   })
 
+  t.test('error from open() bubbles up', function (t) {
+    t.plan(1)
+
+    var mockdb = {
+      open: function (cb) {
+        process.nextTick(cb, new Error('error from underlying store'))
+      }
+    }
+
+    subdb(mockdb, 'test')
+
+    // Awkward: we don't pass a callback to levelup() so levelup goes
+    // into "promise mode" which we can't catch properly
+    process.once('unhandledRejection', (err) => {
+      t.is(err.message, 'error from underlying store')
+    })
+  })
+
   t.test('levelup *down is set to subdown which has correct storage', function (t) {
     var db = levelup(memdown())
     var sub = subdb(db, 'test')
@@ -184,8 +217,35 @@ test('SubDb main function', function (t) {
     var sub = subdb(db, { valueEncoding: 'json' })
     t.equal(sub.db._db.db.prefix, '!!')
   })
-})
 
-function down (loc) {
-  return subdown(levelup(memdown()), 'test')
-}
+  t.test('errors from iterator bubble up', function (t) {
+    t.plan(2)
+
+    var mockdb = {
+      open: function (cb) {
+        process.nextTick(cb)
+      },
+      iterator: function () {
+        return {
+          next: function (cb) {
+            process.nextTick(cb, new Error('next() error from underlying store'))
+          },
+          end: function (cb) {
+            process.nextTick(cb, new Error('end() error from underlying store'))
+          }
+        }
+      }
+    }
+
+    var sub = subdb(mockdb, 'test')
+    var it = sub.iterator()
+
+    it.next(function (err) {
+      t.is(err.message, 'next() error from underlying store')
+
+      it.end(function (err) {
+        t.is(err.message, 'end() error from underlying store')
+      })
+    })
+  })
+})