fix linter issues (#184)

.golangci.yml

@@ -52,6 +52,9 @@ issues:
     - text: "ST1003:"
       linters:
         - stylecheck
+    - text: "SA1019:"
+      linters:
+        - staticcheck
   max-issues-per-linter: 10000
   max-same-issues: 10000
 

ethereum/rpc/namespaces/eth/filters/api.go

@@ -22,8 +22,8 @@ import (
 	evmtypes "github.com/tharsis/ethermint/x/evm/types"
 )
 
-// FiltersBackend defines the methods requided by the PublicFilterAPI backend
-type FiltersBackend interface {
+// Backend defines the methods requided by the PublicFilterAPI backend
+type Backend interface {
 	GetBlockByNumber(blockNum types.BlockNumber, fullTx bool) (map[string]interface{}, error)
 	HeaderByNumber(blockNum types.BlockNumber) (*ethtypes.Header, error)
 	HeaderByHash(blockHash common.Hash) (*ethtypes.Header, error)
@@ -51,14 +51,14 @@ type filter struct {
 // PublicFilterAPI offers support to create and manage filters. This will allow external clients to retrieve various
 // information related to the Ethereum protocol such as blocks, transactions and logs.
 type PublicFilterAPI struct {
-	backend   FiltersBackend
+	backend   Backend
 	events    *EventSystem
 	filtersMu sync.Mutex
 	filters   map[rpc.ID]*filter
 }
 
 // NewPublicAPI returns a new PublicFilterAPI instance.
-func NewPublicAPI(tmWSClient *rpcclient.WSClient, backend FiltersBackend) *PublicFilterAPI {
+func NewPublicAPI(tmWSClient *rpcclient.WSClient, backend Backend) *PublicFilterAPI {
 	api := &PublicFilterAPI{
 		backend: backend,
 		filters: make(map[rpc.ID]*filter),

ethereum/rpc/namespaces/eth/filters/filters.go

@@ -18,21 +18,21 @@ import (
 
 // Filter can be used to retrieve and filter logs.
 type Filter struct {
-	backend  FiltersBackend
+	backend  Backend
 	criteria filters.FilterCriteria
 	matcher  *bloombits.Matcher
 }
 
 // NewBlockFilter creates a new filter which directly inspects the contents of
 // a block to figure out whether it is interesting or not.
-func NewBlockFilter(backend FiltersBackend, criteria filters.FilterCriteria) *Filter {
+func NewBlockFilter(backend Backend, criteria filters.FilterCriteria) *Filter {
 	// Create a generic filter and convert it into a block filter
 	return newFilter(backend, criteria, nil)
 }
 
 // NewRangeFilter creates a new filter which uses a bloom filter on blocks to
 // figure out whether a particular block is interesting or not.
-func NewRangeFilter(backend FiltersBackend, begin, end int64, addresses []common.Address, topics [][]common.Hash) *Filter {
+func NewRangeFilter(backend Backend, begin, end int64, addresses []common.Address, topics [][]common.Hash) *Filter {
 	// Flatten the address and topic filter clauses into a single bloombits filter
 	// system. Since the bloombits are not positional, nil topics are permitted,
 	// which get flattened into a nil byte slice.
@@ -67,7 +67,7 @@ func NewRangeFilter(backend FiltersBackend, begin, end int64, addresses []common
 }
 
 // newFilter returns a new Filter
-func newFilter(backend FiltersBackend, criteria filters.FilterCriteria, matcher *bloombits.Matcher) *Filter {
+func newFilter(backend Backend, criteria filters.FilterCriteria, matcher *bloombits.Matcher) *Filter {
 	return &Filter{
 		backend:  backend,
 		criteria: criteria,