Total: 36h

1. implement or find simple thread-safe buffered queue as replacement for go channels: 8h
channels are required not only in SyncManager, other components need them as well

2. SyncManager : 24h
	assumes using multiple worker threads dealing with same queues,
	state machine: need to formally implement methods where state is mentioned
	so I suppose boost::asio to be preferred
	most methods make locks, it makes sense in multithreaded environment. Consider using atomics or mutexes
	consider to refactor other code and determine if it requires locks
	takes external doSync() functional object, need to keep it in mind
	syncWorkerCount in lotus is a global const, need to decide whether to take it as create() param or make staic const
	methods names will be reworked, since lotus naming has poor quality
	methods parameters and results are not strict and are written in simplified pseudocode

depends:
	boost::asio
	libp2p::peerId

methods:
	create()
	start()
	stop()
	setPeerHead() // state aware
	Tipset selectSyncTarget()
	void syncScheduler()
	void scheduleIncoming() // state aware
	void scheduleProcessResult(SyncResult) // state aware
	void scheduleWorkSent()
	void syncWorker(int id)
	int syncedPeerCount()
	BootStrapState getBootstrapState()
	void setBootstrapState(BootStrapState)
	bool isBootstrapped()

tests:
	create success
	start/stop success
	set peer head success / acceptance test
	select sync target acceptance test
	syncScheduler acceptance test
	syncWorker acceptance test


	set bootstrapstate/check bootstrapstate success
	is bootstrapped check success


3. SyncTargetBucket : 3h
	type syncTargetBucket struct {
		tips  []*types.TipSet
		count int
	}

depends:
	Tipset

methods:
	bool sameChainAs(Tipset[])
	void add()
	Tipset getHeaviestTipset()
tests:
	create success
	add & contain success
	get heaviest tipset success


4. SyncBucketSet
depends:
	SyncTargetBucket

methods:
	create(Tipset[])
	bool isRelatedToAny(Tipset)
	void insert(Tipset)
	SyncTargetBucket popBucket()
	void removeBucket(SyncTargetBucket)
	SyncTargetBucket PopRelated(Tipset)
	Tipset getHeaviest()
	bool isEmpty()


5. SyncerState: 1h
depends:
	enum SyncStageState:
	Tipset // implemented
	chrono

methods:
	stage2string()
	setStage()
	init()
	setError() (error)
	takeSnapshot()
tests:
	set stage success
	init success
	set error success
	take snapshot success