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lite2: light client with weak subjectivity (#3989)
Refs #1771 ADR: https://github.com/tendermint/tendermint/blob/master/docs/architecture/adr-044-lite-client-with-weak-subjectivity.md ## Commits: * add Verifier and VerifyCommitTrusting * add two more checks make trustLevel an option * float32 for trustLevel * check newHeader time * started writing lite Client * unify Verify methods * ensure h2.Header.bfttime < h1.Header.bfttime + tp * move trust checks into Verify function * add more comments * more docs * started writing tests * unbonding period failures * tests are green * export ErrNewHeaderTooFarIntoFuture * make golangci happy * test for non-adjusted headers * more precision * providers and stores * VerifyHeader and VerifyHeaderAtHeight funcs * fix compile errors * remove lastVerifiedHeight, persist new trusted header * sequential verification * remove TrustedStore option * started writing tests for light client * cover basic cases for linear verification * bisection tests PASS * rename BisectingVerification to SkippingVerification * refactor the code * add TrustedHeader method * consolidate sequential verification tests * consolidate skipping verification tests * rename trustedVals to trustedNextVals * start writing docs * ValidateTrustLevel func and ErrOldHeaderExpired error * AutoClient and example tests * fix errors * update doc * remove ErrNewHeaderTooFarIntoFuture This check is unnecessary given existing a) ErrOldHeaderExpired b) h2.Time > now checks. * return an error if we're at more recent height * add comments * add LastSignedHeaderHeight method to Store I think it's fine if Store tracks last height * copy over proxy from old lite package * make TrustedHeader return latest if height=0 * modify LastSignedHeaderHeight to return an error if no headers exist * copy over proxy impl * refactor proxy and start http lite client * Tx and BlockchainInfo methods * Block method * commit method * code compiles again * lite client compiles * extract updateLiteClientIfNeededTo func * move final parts * add placeholder for tests * force usage of lite http client in proxy * comment out query tests for now * explicitly mention tp: trusting period * verify nextVals in VerifyHeader * refactor bisection * move the NextValidatorsHash check into updateTrustedHeaderAndVals + update the comment * add ConsensusParams method to RPC client * add ConsensusParams to rpc/mock/client * change trustLevel type to a new cmn.Fraction type + update SkippingVerification comment * stress out trustLevel is only used for non-adjusted headers * fixes after Fede's review Co-authored-by: Federico Kunze <31522760+fedekunze@users.noreply.github.com> * compare newHeader with a header from an alternative provider * save pivot header Refs https://github.com/tendermint/tendermint/pull/3989#discussion_r349122824 * check header can still be trusted in TrustedHeader Refs https://github.com/tendermint/tendermint/pull/3989#discussion_r349101424 * lite: update Validators and Block endpoints - Block no longer contains BlockMeta - Validators now accept two additional params: page and perPage * make linter happy
This commit is contained in:
Anton Kaliaev
GitHub
95
lite2/example_test.go
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95
lite2/example_test.go
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package lite
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//func TestExample_Client(t *testing.T) {
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// const (
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// chainID = "my-awesome-chain"
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// )
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// dbDir, err := ioutil.TempDir("", "lite-client-example")
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// if err != nil {
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// t.Fatal(err)
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// }
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// defer os.RemoveAll(dbDir)
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// // TODO: fetch the "trusted" header from a node
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// header := (*types.SignedHeader)(nil)
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// /////////////////////////////////////////////////////////////////////////////
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// db, err := dbm.NewGoLevelDB("lite-client-db", dbDir)
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// if err != nil {
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// // return err
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// t.Fatal(err)
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// }
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// c, err := NewClient(
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// chainID,
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// TrustOptions{
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// Period: 504 * time.Hour, // 21 days
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// Height: 100,
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// Hash: header.Hash(),
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// },
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// httpp.New(chainID, "tcp://localhost:26657"),
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// dbs.New(db, chainID),
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// )
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// err = c.VerifyHeaderAtHeight(101, time.Now())
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// if err != nil {
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// fmt.Println("retry?")
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// }
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// h, err := c.TrustedHeader(101)
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// if err != nil {
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// fmt.Println("retry?")
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// }
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// fmt.Println("got header", h)
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// // verify some data
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//}
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//func TestExample_AutoClient(t *testing.T) {
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// const (
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// chainID = "my-awesome-chain"
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// )
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// dbDir, err := ioutil.TempDir("", "lite-client-example")
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// if err != nil {
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// t.Fatal(err)
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// }
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// defer os.RemoveAll(dbDir)
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// // TODO: fetch the "trusted" header from a node
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// header := (*types.SignedHeader)(nil)
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// /////////////////////////////////////////////////////////////////////////////
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// db, err := dbm.NewGoLevelDB("lite-client-db", dbDir)
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// if err != nil {
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// // return err
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// t.Fatal(err)
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// }
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// base, err := NewClient(
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// chainID,
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// TrustOptions{
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// Period: 504 * time.Hour, // 21 days
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// Height: 100,
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// Hash: header.Hash(),
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// },
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// httpp.New(chainID, "tcp://localhost:26657"),
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// dbs.New(db, chainID),
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// )
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// c := NewAutoClient(base, 1*time.Second)
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// defer c.Stop()
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// select {
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// case h := <-c.TrustedHeaders():
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// fmt.Println("got header", h)
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// // verify some data
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// case err := <-c.Err():
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// switch errors.Cause(err).(type) {
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// case ErrOldHeaderExpired:
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// // reobtain trust height and hash
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// default:
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// // try with another full node
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// fmt.Println("got error", err)
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// }
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// }
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//}
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