lite2: improve string output of all existing providers (#4387)

before:
&http{AFBSD743A...}

after:
http{https://127.0.0.1:26657}

Co-authored-by: Marko <marbar3778@yahoo.com>

lite2/provider/http/http.go

@@ -13,6 +13,8 @@ import (
 type SignStatusClient interface {
 	rpcclient.SignClient
 	rpcclient.StatusClient
+	// Remote returns the remote network address in a string form.
+	Remote() string
 }
 
 // http provider uses an RPC client (or SignStatusClient more generally) to
@@ -45,6 +47,10 @@ func (p *http) ChainID() string {
 	return p.chainID
 }
 
+func (p *http) String() string {
+	return fmt.Sprintf("http{%s}", p.client.Remote())
+}
+
 // SignedHeader fetches a SignedHeader at the given height and checks the
 // chainID matches.
 func (p *http) SignedHeader(height int64) (*types.SignedHeader, error) {

lite2/provider/mock/deadmock.go

@@ -0,0 +1,33 @@
+package mock
+
+import (
+	"errors"
+
+	"github.com/tendermint/tendermint/lite2/provider"
+	"github.com/tendermint/tendermint/types"
+)
+
+type deadMock struct {
+	chainID string
+}
+
+// NewDeadMock creates a mock provider that always errors.
+func NewDeadMock(chainID string) provider.Provider {
+	return &deadMock{chainID: chainID}
+}
+
+func (p *deadMock) ChainID() string {
+	return p.chainID
+}
+
+func (p *deadMock) String() string {
+	return "deadMock"
+}
+
+func (p *deadMock) SignedHeader(height int64) (*types.SignedHeader, error) {
+	return nil, errors.New("no response from provider")
+}
+
+func (p *deadMock) ValidatorSet(height int64) (*types.ValidatorSet, error) {
+	return nil, errors.New("no response from provider")
+}

lite2/provider/mock/mock.go

@@ -1,7 +1,8 @@
 package mock
 
 import (
-	"github.com/pkg/errors"
+	"fmt"
+	"strings"
 
 	"github.com/tendermint/tendermint/lite2/provider"
 	"github.com/tendermint/tendermint/types"
@@ -23,10 +24,25 @@ func New(chainID string, headers map[int64]*types.SignedHeader, vals map[int64]*
 	}
 }
 
+// ChainID returns the blockchain ID.
 func (p *mock) ChainID() string {
 	return p.chainID
 }
 
+func (p *mock) String() string {
+	var headers strings.Builder
+	for _, h := range p.headers {
+		fmt.Fprintf(&headers, " %d:%X", h.Height, h.Hash())
+	}
+
+	var vals strings.Builder
+	for _, v := range p.vals {
+		fmt.Fprintf(&vals, " %X", v.Hash())
+	}
+
+	return fmt.Sprintf("mock{headers: %s, vals: %v}", headers.String(), vals.String())
+}
+
 func (p *mock) SignedHeader(height int64) (*types.SignedHeader, error) {
 	if height == 0 && len(p.headers) > 0 {
 		return p.headers[int64(len(p.headers))], nil
@@ -46,24 +62,3 @@ func (p *mock) ValidatorSet(height int64) (*types.ValidatorSet, error) {
 	}
 	return nil, provider.ErrValidatorSetNotFound
 }
-
-type deadMock struct {
-	chainID string
-}
-
-// NewDeadMock creates a mock provider that always errors.
-func NewDeadMock(chainID string) provider.Provider {
-	return &deadMock{chainID: chainID}
-}
-
-func (p *deadMock) ChainID() string {
-	return p.chainID
-}
-
-func (p *deadMock) SignedHeader(height int64) (*types.SignedHeader, error) {
-	return nil, errors.New("no response from provider")
-}
-
-func (p *deadMock) ValidatorSet(height int64) (*types.ValidatorSet, error) {
-	return nil, errors.New("no response from provider")
-}

lite2/provider/provider.go

@@ -1,6 +1,8 @@
 package provider
 
-import "github.com/tendermint/tendermint/types"
+import (
+	"github.com/tendermint/tendermint/types"
+)
 
 // Provider provides information for the lite client to sync (verification
 // happens in the client).