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package http
import (
"errors"
"fmt"
"regexp"
"strings"
"github.com/tendermint/tendermint/light/provider"
rpcclient "github.com/tendermint/tendermint/rpc/client"
rpchttp "github.com/tendermint/tendermint/rpc/client/http"
"github.com/tendermint/tendermint/types"
)
// This is very brittle, see: https://github.com/tendermint/tendermint/issues/4740
var regexpMissingHeight = regexp.MustCompile(`height \d+ (must be less than or equal to|is not available)`)
// http provider uses an RPC client to obtain the necessary information.
type http struct {
chainID string
client rpcclient.RemoteClient
}
// New creates a HTTP provider, which is using the rpchttp.HTTP client under
// the hood. If no scheme is provided in the remote URL, http will be used by
// default.
func New(chainID, remote string) (provider.Provider, error) {
// Ensure URL scheme is set (default HTTP) when not provided.
if !strings.Contains(remote, "://") {
remote = "http://" + remote
}
httpClient, err := rpchttp.New(remote, "/websocket")
if err != nil {
return nil, err
}
return NewWithClient(chainID, httpClient), nil
}
// NewWithClient allows you to provide a custom client.
func NewWithClient(chainID string, client rpcclient.RemoteClient) provider.Provider {
return &http{
client: client,
chainID: chainID,
}
}
// ChainID returns a chainID this provider was configured with.
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) {
h, err := validateHeight(height)
if err != nil {
return nil, err
}
commit, err := p.client.Commit(h)
if err != nil {
// TODO: standartise errors on the RPC side
if regexpMissingHeight.MatchString(err.Error()) {
return nil, provider.ErrSignedHeaderNotFound
}
return nil, err
}
if commit.Header == nil {
return nil, errors.New("header is nil")
}
// Verify we're still on the same chain.
if p.chainID != commit.Header.ChainID {
return nil, fmt.Errorf("expected chainID %s, got %s", p.chainID, commit.Header.ChainID)
}
return &commit.SignedHeader, nil
}
// ValidatorSet fetches a ValidatorSet at the given height. Multiple HTTP
// requests might be required if the validator set size is over 100.
func (p *http) ValidatorSet(height int64) (*types.ValidatorSet, error) {
h, err := validateHeight(height)
if err != nil {
return nil, err
}
maxPerPage := 100
res, err := p.client.Validators(h, nil, &maxPerPage)
if err != nil {
// TODO: standartise errors on the RPC side
if regexpMissingHeight.MatchString(err.Error()) {
return nil, provider.ErrValidatorSetNotFound
}
return nil, err
}
var (
vals = res.Validators
page = 1
)
// Check if there are more validators.
for len(res.Validators) == maxPerPage {
res, err = p.client.Validators(h, &page, &maxPerPage)
if err != nil {
return nil, err
}
if len(res.Validators) > 0 {
vals = append(vals, res.Validators...)
}
page++
}
return types.NewValidatorSet(vals), nil
}
// ReportEvidence calls `/broadcast_evidence` endpoint.
func (p *http) ReportEvidence(ev types.Evidence) error {
_, err := p.client.BroadcastEvidence(ev)
return err
}
func validateHeight(height int64) (*int64, error) {
if height < 0 {
return nil, fmt.Errorf("expected height >= 0, got height %d", height)
}
h := &height
if height == 0 {
h = nil
}
return h, nil
}