ashatora/node-mbtiles
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Support copy resume.

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Young Hahn
2012-01-26 16:47:19 -05:00
parent c0739bfa0c
commit aee58b0a2b
1 changed files with 20 additions and 1 deletions
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21
lib/mbtiles.js
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@@ -392,7 +392,7 @@ MBTiles.prototype.startWriting = function(callback) {
if (!this._isWritable) {
this._isWritable = 1;
this._clearCaches();
this._db.exec('PRAGMA journal_mode = OFF; PRAGMA locking_mode = EXCLUSIVE; PRAGMA synchronous=OFF; PRAGMA cache_size = 400000;', callback);
this._db.exec('PRAGMA locking_mode = EXCLUSIVE; PRAGMA synchronous=OFF; PRAGMA cache_size = 400000;', callback);
} else {
this._isWritable++;
return callback(null);
@@ -613,3 +613,22 @@ MBTiles.prototype.putInfo = function(data, callback) {
});
});
};
// Copy resume. Optionally retrieve the highest inserted key for resuming a
// tilelive.copy operation.
MBTiles.prototype.copyResume = function(callback) {
if (typeof callback !== 'function') throw new Error('Callback needed');
if (!this.open) return callback(new Error('MBTiles not yet loaded'));
var mbtiles = this;
Step(function() {
mbtiles._db.get('SELECT zoom_level AS z, tile_column AS x, tile_row AS y FROM tiles ORDER BY z DESC, y DESC, x DESC LIMIT 1', this.parallel());
mbtiles._db.get('SELECT COUNT(*) AS copied FROM tiles WHERE tile_data IS NOT NULL', this.parallel());
}, function(err, coords, copied) {
if (err) return callback(err);
// Flip Y coordinate back to XYZ for tilelive API.
if (coords) coords.y = (1 << coords.z) - 1 - coords.y;
if (coords && copied) coords.copied = copied.copied;
return callback(null, coords);
});
};