Before we were storing trustedHeader (height=1) and trustedNextVals
(height=2).
After this change, we will be storing trustedHeader (height=1) and
trustedVals (height=1). This a) simplifies the code b) fixes#4399
inconsistent pairing issue c) gives a relayer access to the current
validator set #4470.
The only downside is more jumps during bisection. If validator set
changes between trustedHeader and the next header (by 2/3 or more), the
light client will be forced to download the next header and check that
2/3+ signed the transition. But we don't expect validator set change too
much and too often, so it's an acceptable compromise.
Closes#4470 and #4399
closes#4426
The sequence and bisection methods no longer save the intermediate headers and validator sets that they require to verify a currently untrusted header.
## Commits:
* sequence and bisection don't save intermediate headers and vals
* check the next validator hash matches the header
* check expired header at start of backwards verification
* added tests
* handled cleanup warning
* lint fix
* removed redundant code
* tweaked minor errors
* avoided premature trusting of nextVals
* fix test error
* updated trustedHeader and Vals together
* fixed bisection error
* fixed sequence error for different vals and made test
* fixes after my own review
* reorder vars to be consistent
with the rest of the code
Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>
closes#4413 and #4419
When VerifyHeaderAtHeight() is called, TrustedHeader is initially run to check if the header has already been verified and returns the Header.
If the new header height is less than the lite clients latestTrustedHeader height, than backwards verification is performed else either sequence or bisection
Refactored a test to reflect the changes
* use trustedHeader func for already verified Headers
* remove fetch missing header from TrustedHeader
* check for already trusted Header in VerifyHeaderAtHeight
* replace updateTrustedHeaderAndVals to updateTrustedHeaderAndNextVals
* rename trustedHeader and trustedNextVals
* refactored backwards and included it in VerifyHeader
* cleaned up test to match changes
* lite2: fixes after my own review
Refs https://github.com/tendermint/tendermint/pull/4428#pullrequestreview-361730169
* fix ineffectual assignment
* lite2: check that header exists in VerifyHeader
* extract function
Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>
The work includes the reactor which ties together all the seperate routines involved in the design of the blockchain v2 refactor. This PR replaces #4067 which got far too large and messy after a failed attempt to rebase.
## Commits:
* Blockchainv 2 reactor:
+ I cleaner copy of the work done in #4067 which fell too far behind and was a nightmare to rebase.
+ The work includes the reactor which ties together all the seperate routines involved in the design of the blockchain v2 refactor.
* fixes after merge
* reorder iIO interface methodset
* change iO -> IO
* panic before send nil block
* rename switchToConsensus -> trySwitchToConsensus
* rename tdState -> tmState
* Update blockchain/v2/reactor.go
Co-Authored-By: Bot from GolangCI <42910462+golangcibot@users.noreply.github.com>
* remove peer when it sends a block unsolicited
* check for not ready in markReceived
* fix error
* fix the pcFinished event
* typo fix
* add documentation for processor fields
* simplify time.Since
* try and make the linter happy
* some doc updates
* fix channel diagram
* Update adr-043-blockchain-riri-org.md
* panic on nil switch
* liting fixes
* account for nil block in bBlockResponseMessage
* panic on duplicate block enqueued by processor
* linting
* goimport reactor_test.go
Co-authored-by: Bot from GolangCI <42910462+golangcibot@users.noreply.github.com>
Co-authored-by: Anca Zamfir <ancazamfir@users.noreply.github.com>
Co-authored-by: Marko <marbar3778@yahoo.com>
Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>
refs #4329
As opposed to using recursion to implement the bisection method of verifying a header, which could have problems with memory allocation (especially for smaller devices), the bisection algorithm now uses a for loop.
* modified bisection to loop
* made lint changes
* made lint changes
* move note to VerifyHeader
since it applies both for sequence and bisection
* test bisection jumps to header signed by 1/3+
of old validator set
* update labels in debug log calls
* copy tc
Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>
Closes#4398
* divided verify functions
* extacted method
* renamed functions. Created standard Verify function
* checked non-adjacency. separated VerifyCommit
* lint fixes
* fix godoc documentation for VerifyAdjacent and VerifyNonAdjacent
* add a comment about VerifyCommit being the last check
Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>
Using the WebSocket server, when the same client calls multiple time the subscribe method, only the last subscription receives all the events of the previous ones.
example:
subscription1 = tm.event = 'NewBlock'
subscription2 = tm.event = 'Tx'
In this case, subscription2 will receive the new blocks but subscription1 will not.
This came from the WebSocket handler that had the declaration of the rpcrequest moved and so overridden for every request and given in the JSONReq client context (so the id of the subscription was not the right one).
This fixes the issue by simply declaring the rpcrequest inside the loop so every request will create a new object without overwriting the previous one.
* update theme
* Update version
* Updated Questions section in the footer
* Remove links to Riot chat
* Typo
* Add Discord link
Co-authored-by: Marko <marbar3778@yahoo.com>
Closes#4385
* extract TrustOptions into its own file
* print trusted hash before asking whenever to rollback or not
so the user could reset the light client with the trusted header
* do not return an error if rollback is aborted
reason: we trust the old header presumably, so can continue from it.
* add note about time of initial header
* improve logging and add comments
* cross-check newHeader after LC verified it
* check if header is not nil
so we don't crash on the next line
* remove witness if it sends us incorrect header
* require at least one witness
* fix build and tests
* rename tests and assert for specific error
* wrote a test
* fix linter errors
* only check 1/3 if headers diverge
Currently the sequence function always starts from the trustedHeader and trustedNextVals stored in the lite client. Whereas the bisection one allows the method to be started from any combination of header and validator set. I opened up the sequence verification method to do the same
The .PHONY targets in the Makefile are usually placed far away from the actual targets, and thus aren't always updated. Placing the .PHONY targets right next to the targets they cover make them more visible and thus more likely to be updated when necessary.
* adr: light client implementation
Closes#2133
* note on chain IDs
* explain why witnesses are required
* if chain forks maliciously, chain ID stays the same
* add a note about min witnesses while cross-checking
* make: remove sentry setup cmds
removal of make comands for sentry setup. it was unclear if they were being maintained and there has not been a mention of people using them
- closes#4379
Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>
* remove depreacted readme
* add not being maintained section to docs
* proto: minor linting
minor linting after working with the proto files in the sdk.
there is no logic change just spacing fixes
Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>
* hardcore linting
- erik fixed many of the broken links, just fixed two outstanding ones.
- closes#4381
Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>
Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>
* witnesses are dropped after no response
* test witness dropout
* corrected import structure
* moved non responsiveness check to compare function
* removed dropout test as witnesses are never dropped
* created test to compare witnesses
* proto: add buf and protogen script
- add buf with minimal changes
- add protogen script to easier generate proto files
Signed-off-by: Marko Baricevic <marbar3778@yahoo.com>
* add protoc needs
* add some needed shell cmds
* remove buf from tools as it is not needed everytime
* add proto lint and breakage to ci
* add section in changelog and upgrading files
* address pr comments
* remove space in circle config
* remove spaces in makefile comment
* add section on contributing on how to work with proto
* bump buf to 0.7
* test bufbuild image
* test install make in bufbuild image
* revert to tendermintdev image
* Update Makefile
Co-Authored-By: Anton Kaliaev <anton.kalyaev@gmail.com>
Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>
* validate trust options
* add NewClientFromTrustedStore func
* make maxRetryAttempts an option
Closes#4370
* hash size should be equal to tmhash.Size
* make maxRetryAttempts uint
* make maxRetryAttempts uint16
maxRetryAttempts possible - 68 years
* we do not store trustingPeriod
* added test to create client from trusted store
* remove header and vals from primary
to make sure we're restoring them from the DB
As opposed to checking a random witness, all witnesses provided should be used as a reference against the header provided by the primary node. This increases security (at the tradeoff of speed) but also gives control to the user. The more witnesses provided, the more secure the lite client can be.
Closes#4328
When TrustedHeader(height) is called, if the height is less than the trusted height but the header is not in the trusted store then a function finds the previous lowest height with a trusted header and performs a forwards sequential verification to the header of the height that was given. If no error is found it updates the trusted store with the header and validator set for that height and can then return them to the user.
Commits:
* drafted trusted header
* created function to find previous trusted height
* updates missing headers less than the trusted height
* minor cosmetic tweaks
* incorporated suggestions
* lite2: implement Backwards verification
and add SignedHeaderAfter func to Store interface
Refs https://github.com/tendermint/tendermint/issues/4328#issuecomment-581878549
* remove unused method
* write tests
* start with next height in SignedHeaderAfter func
* fix linter errors
* address Callum's comments
Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>
Closes issue #4338
Uses a wrapper function around both the signedHeader and validatorSet calls to the primary provider which attempts to retrieve the information 5 times before deeming the provider unavailable and replacing the primary provider with the first alternative before trying recursively again (until all alternatives are depleted)
Employs a mutex lock for any operations involving the providers of the light client to ensure no operations occurs whilst the new primary is chosen.
Commits:
* created swapProvider function
* eliminates old primary provider after replacement. Uses a mutex when changing providers
* renamed to replaceProvider
* created wrapped functions for signed header and val set
* created test for primary provider replacement
* implemented suggested revisions
* created Witnesses() and Primary()
* modified backoffAndJitterTime
* modified backoffAndJitterTime
* changed backoff base and jitter to functional arguments
* implemented suggested changes
* removed backoff function
* changed exp function to match go version
* halved the backoff time
* removed seeding and added comments
* fixed incorrect test
* extract backoff timeout calc into a function
Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>
* update guides with correct path to libs/kv proto files
* Apply suggestions from code review
Co-Authored-By: Anton Kaliaev <anton.kalyaev@gmail.com>
* format something to rerun ci
Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>
