kevoree-core/lib/adaptation-executor.js

Kevoree Javascript platform core

module.exports = function adaptationExecutor(core, model, adaptations) {
  const start = new Date().getTime();
  const executedCmds = [];

  return adaptations
    .reduce((previousCmd, next, index, adaptations) => {
      return previousCmd.then(() => {
        if (index > 0) {
          executedCmds.unshift(adaptations[index - 1]);
        }
        return next.execute();
      }, (err) => {
        if (core.stopping) {
          // if core is stopping, just log error and keep on adapting
          core.log.error('Adaptation error while stopping core...\n' + err.stack);
        } else {
          throw err;
        }
      });
    }, Promise.resolve())
    .then(() => {
      // === All adaptations executed successfully :)
      // set current model
      core.currentModel = model;
      // reset deployModel
      core.deployModel = null;
      // adaptations succeed : woot
      core.log.info((core.stopping ? 'Stop model' : 'Model') + ' deployed successfully: ' + adaptations.length + ' adaptations (' + (new Date().getTime() - start) + 'ms)');
      // all good :)
      // process script queue if any
      core.processScriptQueue();
      core.firstBoot = false;
      try {
        process.nextTick(() => core.emitter.emit('deployed'));
      } catch (err) {
        core.log.error('Error catched\n' + err.stack);
      }
    })
    .catch((err) => {
      // === At least one adaptation failed
      core.log.error(err);

      if (core.firstBoot) {
        // === If adaptations failed on startup then it is bad => exit
        core.log.warn('Shutting down Kevoree because bootstrap failed...');
        core.deployModel = null;
        return core.stop()
          .then(() => { throw new Error('Something went wrong while executing adaptations'); });
      } else {
        // === If not firstBoot => try to rollback...
        return executedCmds
          .reduce((previous, next) => {
            return previous.then(() => {
              return next.undo();
            });
          }, Promise.resolve())
          .then(() => {
            // === Rollback success :)
            core.log.info('Rollback succeed: ' + executedCmds.length + ' adaptations (' + (new Date().getTime() - start) + 'ms)');
            core.deployModel = null;
            process.nextTick(() => core.emitter.emit('rollbackSucceed'));
            throw new Error('Rollbacked to previous state');
          }, (err) => {
            // === Rollback failed => cannot recover from this...
            core.log.error(err);
            // stop everything :(
            core.deployModel = null;
            process.nextTick(() => core.emitter.emit('error', err));
            return core.stop()
              .then(() => { throw new Error('Something went wrong while rollbacking. Process will exit.'); });
          });
      }
    });
};