/node_modules/rethinkdbdash/test/transform-stream.js

var config = require('./config.js');
var r = require('../lib')(config);
var util = require(__dirname+'/util/common.js');
var assert = require('assert');
var Readable = require('stream').Readable;
var Stream = require('stream')
var _util = require('util');
var devnull = require('dev-null');

var uuid = util.uuid;
var It = util.It

var dbName, tableName, tableName2, stream, result, pks, feed;

var numDocs = 100; // Number of documents in the "big table" used to test the SUCCESS_PARTIAL 


It('Init for `transform-stream.js`', function* (done) {
  try {
    dbName = uuid();
    tableName = uuid(); // Big table to test partial sequence
    dumpTable = uuid(); // dump table

    result = yield r.dbCreate(dbName).run()
    assert.equal(result.dbs_created, 1);
    //yield r.db(dbName).wait().run()
    result = yield [
      r.db(dbName).tableCreate(tableName)('tables_created').run(),
      r.db(dbName).tableCreate(dumpTable)('tables_created').run()]
    assert.deepEqual(result, [1, 1]);
    done();
  }
  catch(e) {
    console.log(e);
    done(e);
  }
})
It('Inserting batch - table 1', function* (done) {
  try {
    result = yield r.db(dbName).table(tableName).insert(eval('['+new Array(numDocs).join('{}, ')+'{}]')).run();
    assert.equal(result.inserted, numDocs);
    done();
  }
  catch(e) {
    done(e);
  }
})

It('test pipe transform - fast input', function* (done) {
  var stream = new Readable({objectMode: true});
  var size = 35;
  var value = uuid();
  for(var i=0; i<size; i++) {
    stream.push({field: value});
  }
  stream.push(null);
  var table = r.db(dbName).table(dumpTable).toStream({transform: true, debug: true, highWaterMark: 10});
  stream.pipe(table)
    .on('error', done)
    .on('end', function() {
      r.db(dbName).table(dumpTable).filter({field: stream._value}).count().run().then(function(result) {
        assert.deepEqual(result, size);
        assert.deepEqual(table._sequence, [10, 10, 10, 5])
        done();
      });
    }).pipe(devnull({objectMode: true}));
})

It('test pipe transform - slow input - 1', function* (done) {
  var stream = new Readable({objectMode: true});
  var size = 10;
  var values = [uuid(), uuid()];
  var table = r.db(dbName).table(dumpTable).toStream({transform: true, debug: true, highWaterMark: 5});

  var i = 0;
  stream._read = function() {
    var self = this;
    i++;
    if (i <= 3) {
      self.push({field: values[0]});
    }
    else if (i === 4) {
      setTimeout(function() {
        self.push({field: values[1]});
      }, 3000)
    }
    else if (i <= 10) {
      self.push({field: values[1]});
    }
    else {
      self.push(null);
    }
  }

  stream.pipe(table)
    .on('error', done)
    .on('end', function() {
      r.expr([
        r.db(dbName).table(dumpTable).filter({field: values[0]}).count(),
        r.db(dbName).table(dumpTable).filter({field: values[1]}).count()
      ]).run().then(function(result) {
        assert.deepEqual(result, [3, 7]);
        assert.deepEqual(table._sequence, [3, 5, 2])
        done();
      });
    }).pipe(devnull({objectMode: true}));
})
It('test pipe transform - slow input - 2', function* (done) {
  var stream = new Readable({objectMode: true});
  var size = 10;
  var values = [uuid(), uuid()];
  var table = r.db(dbName).table(dumpTable).toStream({transform: true, debug: true, highWaterMark: 5});

  var i = 0;
  stream._read = function() {
    var self = this;
    i++;
    if (i <= 5) {
      self.push({field: values[0]});
    }
    else if (i === 6) {
      setTimeout(function() {
        self.push({field: values[1]});
      }, 3000)
    }
    else if (i <= 10) {
      self.push({field: values[1]});
    }
    else {
      self.push(null);
    }
  }

  stream.pipe(table)
    .on('error', done)
    .on('end', function() {
      r.expr([
        r.db(dbName).table(dumpTable).filter({field: values[0]}).count(),
        r.db(dbName).table(dumpTable).filter({field: values[1]}).count()
      ]).run().then(function(result) {
        assert.deepEqual(result, [5, 5]);
        assert.deepEqual(table._sequence, [5, 5])
        done();
      });
    }).pipe(devnull({objectMode: true}));
})
It('test pipe transform - single insert', function* (done) {
  // Create a transform stream that will convert data to a string
  //var stream = new Input();
  var stream = new Readable({objectMode: true});
  var size = 10;
  var value = uuid();
  var table = r.db(dbName).table(dumpTable).toStream({transform: true, debug: true, highWaterMark: 5});

  var i = 0;
  stream._read = function() {
    i++;
    if (i > 10) {
      this.push(null);
    }
    else {
      var self = this;
      setTimeout(function() {
        self.push({field: value});
      }, 100); // suppose that each insert take less than 100 ms
    }
  }

  stream.pipe(table)
    .on('error', done)
    .on('end', function() {
      r.expr(r.db(dbName).table(dumpTable).filter({field: value}).count()).run().then(function(result) {
        assert.deepEqual(result, 10);
        assert.deepEqual(table._sequence, [1, 1, 1, 1, 1, 1, 1, 1, 1, 1])
        done();
      });
    }).pipe(devnull({objectMode: true}));
})

It('test transform output - object', function* (done) {
  var stream = new Readable({objectMode: true});
  var i = 0;
  var values = [uuid(), uuid()];
  stream._read = function() {
    var self = this;
    i++;
    if (i <= 3) {
      self.push({field: values[0]});
    }
    else if (i === 4) {
      setTimeout(function() {
        self.push({field: values[1]});
      }, 300)
    }
    else if (i <= 10) {
      self.push({field: values[1]});
    }
    else {
      self.push(null);
    }
  }

  var table = r.db(dbName).table(dumpTable).toStream({
    transform: true
  });

  var result = [];
  var endStream = new Stream.Transform();
  endStream._writableState.objectMode = true;
  endStream._readableState.objectMode = true;
  endStream._transform = function (data, encoding, done) {
    result.push(data);
    this.push(data);
    done();
  }

  stream.pipe(table)
    .on('error', done)
    .pipe(endStream)
    .on('error', done)
    .on('finish', function() {
      assert(result.length, 10);
      for(var i=0; i<result.length; i++) {
        assert(Object.prototype.toString.call(result[i]), '[object Object]');
      }
      done();
    });
})

It('test transform output - string', function* (done) {
  var stream = new Readable({objectMode: true});
  var i = 0;
  var values = [uuid(), uuid()];
  stream._read = function() {
    var self = this;
    i++;
    if (i <= 3) {
      self.push({field: values[0]});
    }
    else if (i === 4) {
      setTimeout(function() {
        self.push({field: values[1]});
      }, 300)
    }
    else if (i <= 10) {
      self.push({field: values[1]});
    }
    else {
      self.push(null);
    }
  }

  var table = r.db(dbName).table(dumpTable).toStream({
    transform: true,
    format: 'primaryKey'
  });

  var result = [];
  var endStream = new Stream.Transform();
  endStream._writableState.objectMode = true;
  endStream._readableState.objectMode = true;
  endStream._transform = function (data, encoding, done) {
    result.push(data);
    this.push(data);
    done();
  }

  stream.pipe(table)
    .on('error', done)
    .pipe(endStream)
    .on('error', done)
    .on('finish', function() {
      assert(result.length, 10);
      for(var i=0; i<result.length; i++) {
        assert(typeof result[i], 'string');
      }
      done();
    });
})