lite: Add synchronization in lite verify (#2396)

* Implement issues 2386: add synchronization in lite verify and change all Certify to Verify

* Replace make(chan struct{}, 0) with make(chan struct{})

* Parameterize memroy cache size and add concurrent test

* Refactor import order

lite/proxy/query.go

@@ -146,7 +146,7 @@ func GetCertifiedCommit(h int64, client rpcclient.Client, cert lite.Verifier) (t
 			h, sh.Height)
 	}
 
-	if err = cert.Certify(sh); err != nil {
+	if err = cert.Verify(sh); err != nil {
 		return types.SignedHeader{}, err
 	}
 

lite/proxy/verifier.go

@@ -8,12 +8,12 @@ import (
 	lclient "github.com/tendermint/tendermint/lite/client"
 )
 
-func NewVerifier(chainID, rootDir string, client lclient.SignStatusClient, logger log.Logger) (*lite.DynamicVerifier, error) {
+func NewVerifier(chainID, rootDir string, client lclient.SignStatusClient, logger log.Logger, cacheSize int) (*lite.DynamicVerifier, error) {
 
 	logger = logger.With("module", "lite/proxy")
 	logger.Info("lite/proxy/NewVerifier()...", "chainID", chainID, "rootDir", rootDir, "client", client)
 
-	memProvider := lite.NewDBProvider("trusted.mem", dbm.NewMemDB()).SetLimit(10)
+	memProvider := lite.NewDBProvider("trusted.mem", dbm.NewMemDB()).SetLimit(cacheSize)
 	lvlProvider := lite.NewDBProvider("trusted.lvl", dbm.NewDB("trust-base", dbm.LevelDBBackend, rootDir))
 	trust := lite.NewMultiProvider(
 		memProvider,

lite/proxy/wrapper.go

@@ -134,10 +134,10 @@ func (w Wrapper) Commit(height *int64) (*ctypes.ResultCommit, error) {
 	}
 	rpcclient.WaitForHeight(w.Client, *height, nil)
 	res, err := w.Client.Commit(height)
-	// if we got it, then certify it
+	// if we got it, then verify it
 	if err == nil {
 		sh := res.SignedHeader
-		err = w.cert.Certify(sh)
+		err = w.cert.Verify(sh)
 	}
 	return res, err
 }