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