Rebase/feat/586/integrate tx model (#641)

* Adjust imports to bigchaindb_common

* Adjust get_spent function signature

* Adjust block serialization

* Fix BigchainApi Test

* Fix TestTransactionValidation tests

* Fix TestBlockValidation tests

* WIP: TestMultipleInputs

* Adjust tests to tx-model interface changes

- Fix old tests
- Fix tests in TestMultipleInputs class

* Remove fulfillment message tests

* Fix TransactionMalleability tests

* Remove Cryptoconditions tests

* Remove create_transaction

* Remove signing logic

* Remove consensus plugin

* Fix block_creation pipeline

* Fix election pipeline

* Replace some util functions with bdb_common ones

- timestamp ==> gen_timestamp
- serialize.

* Implement Block model

* Simplify function signatures for vote functions

Change parameter interface for the following functions:

- has_previous_vote
- verify_vote_signature
- block_election_status

so that they take a block's id and voters instead of a fake block.

* Integrate Block and Transaction model

* Fix leftover tests and cleanup conftest

* Add bigchaindb-common to install_requires

* Delete transactions after block is written (#609)

* delete transactions after block is written

* cleanup transaction_exists

* check for duplicate transactions

* delete invalid tx from backlog

* test duplicate transaction

* Remove dead code

* Test processes.py

* Test invalid tx in on server

* Fix tests for core.py

* Fix models tests

* Test commands main fn

* Add final coverage to vote pipeline

* Add more tests to voting pipeline

* Remove consensus plugin docs and misc

* Post rebase fixes

* Fix rebase mess

* Remove extra blank line

* Improve docstring

* Remove comment

handled in bigchaindb/cryptoconditions#27;
see https://github.com/bigchaindb/cryptoconditions/issues/27

* Fix block serialization in block creation

* Add signed_ prefix to transfer_tx

* Improve docs

* Add library documentation page on pipelines

* PR feedback for models.py

* Impr. readability of get_last_voted_block

* Use dict comprehension

* Add docker-compose file to build and serve docs

locally for development purposes

* Change private_key for signing_key

* Improve docstrings

* Remove consensus docs

* Document new consensus module

* Create different transactions for the block

* Cleanup variable names in block.py

* Create different transactions for the block

* Cleanup variable names in block.py

tests/doc/run_doc_python_server_api_examples.py

@@ -2,6 +2,7 @@ import json
 from time import sleep
 
 import cryptoconditions as cc
+from bigchaindb_common.util import gen_timestamp
 
 from bigchaindb import Bigchain, util, crypto, exceptions
 
@@ -315,7 +316,7 @@ tx_timeout = b.create_transaction(b.me, None, None, 'CREATE')
 
 # Set expiry time (12 secs from now)
 time_sleep = 12
-time_expire = str(float(util.timestamp()) + time_sleep)
+time_expire = str(float(gen_timestamp()) + time_sleep)
 
 # only valid if the server time <= time_expire
 condition_timeout = cc.TimeoutFulfillment(expire_time=time_expire)
@@ -355,7 +356,7 @@ tx_timeout_transfer['transaction']['fulfillments'][0]['fulfillment'] = timeout_f
 # no need to sign transaction, like with hashlocks
 for i in range(time_sleep - 4):
     tx_timeout_valid = b.is_valid_transaction(tx_timeout_transfer) == tx_timeout_transfer
-    seconds_to_timeout = int(float(time_expire) - float(util.timestamp()))
+    seconds_to_timeout = int(float(time_expire) - float(gen_timestamp()))
     print('tx_timeout valid: {} ({}s to timeout)'.format(tx_timeout_valid, seconds_to_timeout))
     sleep(1)
 
@@ -370,7 +371,7 @@ tx_escrow = b.create_transaction(testuser2_pub, [testuser2_pub, testuser1_pub],
 
 # Set expiry time (12 secs from now)
 time_sleep = 12
-time_expire = str(float(util.timestamp()) + time_sleep)
+time_expire = str(float(gen_timestamp()) + time_sleep)
 
 # Create escrow and timeout condition
 condition_escrow = cc.ThresholdSha256Fulfillment(threshold=1)  # OR Gate
@@ -486,6 +487,6 @@ for i in range(time_sleep - 4):
     valid_execute = b.is_valid_transaction(tx_escrow_execute) == tx_escrow_execute
     valid_abort = b.is_valid_transaction(tx_escrow_abort) == tx_escrow_abort
 
-    seconds_to_timeout = int(float(time_expire) - float(util.timestamp()))
+    seconds_to_timeout = int(float(time_expire) - float(gen_timestamp()))
     print('tx_execute valid: {} - tx_abort valid {} ({}s to timeout)'.format(valid_execute, valid_abort, seconds_to_timeout))
     sleep(1)