levelup - npm Package Compare versions

Comparing version 0.4.2 to 0.4.3

lib/levelup.js

@@ -278,2 +278,30 @@ /* Copyright (c) 2012 Rod Vagg <@rvagg> */
 
+  , approximateSize: function(start, end, callback) {
+      var err
+
+      if (!this.isOpen() && !this.isClosed()) {
+        return this.once('ready', function () {
+          this.approximateSize(start, end, callback)
+        })
+      }
+
+      if (this.isClosed()) {
+        err = new errors.WriteError('Database is not open')
+        if (callback)
+          return callback(err)
+        throw err
+      }
+
+      this._db.approximateSize(start, end, function(err, size) {
+        if (err) {
+          err = new errors.OpenError(err)
+          if (callback)
+            return callback(err)
+          this.emit('error', err)
+        } else {
+          callback && callback(null, size)
+        }
+      });
+    }
+
   , readStream: function (options) {
@@ -280,0 +308,0 @@ options = extend(extend({}, this._options), typeof options == 'object' ? options : {})

package.json

@@ -16,3 +16,3 @@ {
     ]
-  , "version": "0.4.2"
+  , "version": "0.4.3"
   , "main": "lib/levelup.js"
@@ -19,0 +19,0 @@ , "dependencies": {

README.md

@@ -73,2 +73,3 @@ LevelUP
   * <a href="#batch"><code>db.<b>batch()</b></code></a>
+  * <a href="#approximateSize"><code>db.<b>approximateSize()</b></code></a>
   * <a href="#isOpen"><code>db.<b>isOpen()</b></code></a>
@@ -201,2 +202,14 @@ * <a href="#isClosed"><code>db.<b>isClosed()</b></code></a>
 --------------------------------------------------------
+<a name='approximateSize'></a>
+### db.approximateSize(start, end, callback)
+<code>approximateSize()</code> can used to get the approximate number of bytes of file system space used by the range `[start..end)`. The result may not include recently written data.
+
+```js
+db.approximateSize('a', 'c', function (err, size) {
+  if (err) return console.error('Ooops!', err)
+  console.log('Approximate size of range is %d', size)
+})
+```
+
+--------------------------------------------------------
 <a name="isOpen"></a>
@@ -384,2 +397,3 @@ ### db.isOpen()
 * Lars-Magnus Skog - [GitHub/ralphtheninja](https://github.com/ralphtheninja) - [Twitter/@ralphtheninja](https://twitter.com/ralphtheninja)
+* David Björklund - [GitHub/kesla](https://github.com/kesla) - [Twitter/david_bjorklund](https://twitter.com/david_bjorklund)
 
@@ -386,0 +400,0 @@ <a name="licence"></a>

test/simple-test.js

@@ -412,2 +412,65 @@ /* Copyright (c) 2012 Rod Vagg <@rvagg> */
 
+  , 'approximateSize()': {
+        'approximateSize() works on empty database': function (done) {
+          this.openTestDatabase(function (db) {
+            db.approximateSize('a', 'z', function(err, size) {
+              refute(err) // sanity
+              assert.equals(size, 0)
+              done()
+            })
+          })
+        }
+
+      , 'approximateSize() work on none-empty database': function(done) {
+          var location = common.nextLocation()
+          var db
+            async.series(
+                [
+                    function (callback) {
+                      this.openTestDatabase(
+                          location
+                        , function (_db) {
+                          db = _db
+                          callback()
+                        }
+                      )
+                    }.bind(this)
+                  , function (callback) {
+                      var batch = [];
+                      for(var i = 0; i < 10; ++i) {
+                        batch.push({
+                          type: 'put', key: String(i), value: 'afoovalue'
+                        });
+                      }
+                      db.batch(
+                          batch
+                        , { sync: true }
+                        , callback
+                      )
+                    }
+                  , function (callback) {
+                      // close db to make sure stuff gets written to disc
+                      db.close(callback)
+                    }
+                  , function (callback) {
+                      levelup(location, function (err, _db) {
+                          refute(err)
+                          db = _db
+                          callback()
+                        }
+                      )
+                    }
+                  , function (callback) {
+                      db.approximateSize('', '99', function(err, size) {
+                        refute(err) // sanity
+                        refute.equals(size, 0)
+                        done()
+                      })
+                    }
+                ]
+              , done
+            )
+        }
+    }
+
   , 'null and undefined': {
@@ -414,0 +477,0 @@ 'setUp': function (done) {

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Improved metrics

Total package byte prevSize

2992787

increased by0.2%

Number of package files

235

increased by0.43%

Lines of code

2941

increased by3.81%

Number of lines in readme file

406

increased by3.57%

Worsened metrics

Number of high supply chain risk alerts

1

increased byInfinity%

No dependency changes