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/*
* Copyright 2018 The CovenantSQL Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// Package sqlchain provides a blockchain implementation for database state tracking.
//
// Bucket hierarchical structure is as following:
//
// [ root ]
// |
// +-- [ sql-chain meta ]
// | |
// | +-- [ state ]: State
// | |
// | +-- [ block ]
// | | |
// | | +--- [ height1+hash1 ]: Block1
// | | +--- [ height2+hash2 ]: Block2
// | | +--- [ height3+hash3 ]: Block3
// | | |
// | | +--- ...
// | |
// | +-- [ query ]
// | |
// | +--- ...
// | |
// | +--- [ height 7 ]
// | | |
// | | +--- [ request ]
// | | | |
// | | | +--- [ header hash1 ]: Request1
// | | | +--- [ header hash2 ]: Request2
// | | | +--- [ header hash3 ]: Request3
// | | | |
// | | | +--- ...
// | | |
// | | +--- [ response ]
// | | | |
// | | | +--- [ header hash1 ]: Response1
// | | | +--- [ header hash2 ]: Response2
// | | | +--- [ header hash3 ]: Response3
// | | | |
// | | | +--- ...
// | | |
// | | +--- [ ack ]
// | | |
// | | +--- [ header hash1 ]: Ack1
// | | +--- [ header hash2 ]: Ack2
// | | +--- [ header hash3 ]: Ack3
// | | |
// | | +--- ...
// | |
// | |
// | +--- [ height 8 ]
// | | |
// | | +--- [ request ]
// | | | |
// | | | +--- ...
// | | |
// | | +--- [ response ]
// | | | |
// | | | +--- ...
// | | |
// | | +--- [ ack ]
// | | |
// | | +--- ...
// | |
// | +--- [ height 9 ]
// | | |
// | | +--- [ request ]
// | | | |
// | | | +--- ...
// | | |
// | | +--- [ response ]
// | | | |
// | | | +--- ...
// | | |
// | | +--- [ ack ]
// | | |
// | | +--- ...
// | |
// | +--- ...
// |
// |-- [ other bucket ]
// |-- [ other bucket ]
// |-- [ other bucket ]
// |
// +-- ...
//
//
//
// Block producing:
//
// blocks: Block-0 Block-1 Block-2 ...
// (Genesis) | |
// | +-{q1, q2} +-{q3, q5} ...
// | | |
// +---------------------+---------------------+-------------------
// | | |
// queries: | q1 q2 q3 | q4 q5 q6 | q7 ...
// \ | |\ |\ |\ | | | | | |
// \ | | \ | | | +--|--+ | + + + +
// (responses) | | \ | | | | \ | |\ |\ \ |\
// \ | | | | | | + \ | | + | \ \ | \
// \ | | | | | | \ \ | | | | \ \ | \
// acks: | | a1 | a2 | + a3| | a5 | a6 + | a7 ...
// | | | | | | | | | | | | \ | | \
// | | | | | | | | | | | | + | | +
// | | | | | | | | | | | | | | | |
// height: 0 +---+----+-+---+--- 1 +----+-+--+-+---+-- 2 +-+-+-----+-------- ...
// | | |
// [ ---- period-0 ---- )[ ---- period-1 ---- )[ ---- period-2 ---- )...
//
// Note: q4 will expire after `config.QueryTTL` blocks; q5 and q6, which are acknowledged in
// period-2, will be included in the next block.
//
package sqlchain