Class ComparatorBuilder

ComparatorBuilder builds a comparison between keys. This can be used for atomic operations in etcd, such as locking:

const id = uuid.v4();

function lock() {
  return client.if('my_lock', 'Create', '==', 0)
    .then(client.put('my_lock').value(id))
    .else(client.get('my_lock'))
    .commit()
    .then(result => console.log(result.succeeded === id ? 'lock acquired' : 'already locked'));
}

function unlock() {
  return client.if('my_lock', 'Value', '==', id)
    .then(client.delete().key('my_lock'))
    .commit();
}
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