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This commit is contained in:
Lucas Molas 2020-07-31 09:56:09 -03:00
parent 97b37474f9
commit 755772e12d
1 changed files with 25 additions and 26 deletions
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51
chain/blocksync/client.go
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@ -23,7 +23,7 @@ import (
// Protocol client.
// FIXME: Rename to just `Client`. Not done at the moment to avoid
// disrupt too much of the consumer code, should be done along
// disrupting too much of the consumer code, should be done along
// https://github.com/filecoin-project/lotus/issues/2612.
type BlockSync struct {
// Connection manager used to contact the server.
@ -53,7 +53,7 @@ func NewClient(
// either a response error status, a failed validation or an internal
// error.
//
// This is the internal single-point-of-entry for all external-facing
// This is the internal single point of entry for all external-facing
// APIs, currently we have 3 very heterogeneous services exposed:
// * GetBlocks: Headers
// * GetFullTipSet: Headers | Messages
@ -67,21 +67,21 @@ func (client *BlockSync) doRequest(
req *Request,
singlePeer *peer.ID,
) (*validatedResponse, error) {
// Validate request.
if req.Length == 0 {
return nil, xerrors.Errorf("invalid request of length 0")
}
if req.Length > MaxRequestLength {
return nil, xerrors.Errorf("request length (%d) above maximum (%d)",
req.Length, MaxRequestLength)
}
if req.Options == 0 {
return nil, xerrors.Errorf("request with no options set")
}
// Validate request.
if req.Length == 0 {
return nil, xerrors.Errorf("invalid request of length 0")
}
if req.Length > MaxRequestLength {
return nil, xerrors.Errorf("request length (%d) above maximum (%d)",
req.Length, MaxRequestLength)
}
if req.Options == 0 {
return nil, xerrors.Errorf("request with no options set")
}
// Generate the list of peers to be queried, either the
// `singlePeer` indicated or all peers available (sorted
// by an internal peer tracker with some randomness injected).
// Generate the list of peers to be queried, either the
// `singlePeer` indicated or all peers available (sorted
// by an internal peer tracker with some randomness injected).
var peers []peer.ID
if singlePeer != nil {
peers = []peer.ID{*singlePeer}
@ -130,16 +130,15 @@ func (client *BlockSync) doRequest(
errString := "doRequest failed for all peers"
if singlePeer != nil {
errString = "doRequest failed for single peer"
// (The peer has already been logged before, don't print it again.)
errString = fmt.Sprintf("doRequest failed for single peer %s", *singlePeer)
}
return nil, xerrors.Errorf(errString)
}
// Process and validate response. Check the status and that the information
// returned matches the request (and its integrity). Extract the information
// Process and validate response. Check the status, the integrity of the
// information returned, and that it matches the request. Extract the information
// into a `validatedResponse` for the external-facing APIs to select what they
// want.
// need.
//
// We are conflating in the single error returned both status and validation
// errors. Peer penalization should happen here then, before returning, so
@ -156,8 +155,8 @@ func (client *BlockSync) processResponse(
options := parseOptions(req.Options)
if options.noOptionsSet() {
// Safety check, this shouldn't happen, and even if it did
// it should be caught by the peer in its error status.
// Safety check: this shouldn't have been sent, and even if it did
// it should have been caught by the peer in its error status.
return nil, xerrors.Errorf("nothing was requested")
}
@ -191,7 +190,7 @@ func (client *BlockSync) processResponse(
return nil, xerrors.Errorf("returned chain head does not match request")
}
// Check `TipSet` are connected (valid chain).
// Check `TipSet`s are connected (valid chain).
for i := 0; i < len(validRes.tipsets) - 1; i++ {
if validRes.tipsets[i].IsChildOf(validRes.tipsets[i+1]) == false {
return nil, fmt.Errorf("tipsets are not connected at height (head - %d)/(head - %d)",
@ -382,6 +381,7 @@ func (client *BlockSync) sendRequestToPeer(
// FIXME: What's the point of setting a blank deadline that won't time out?
// Is this our way of clearing the old one?
client.peerTracker.logFailure(peer, build.Clock.Since(connectionStart))
// FIXME: Should we also remove peer here?
return nil, err
}
// FIXME: Same, why are we doing this again here?
@ -390,7 +390,6 @@ func (client *BlockSync) sendRequestToPeer(
// Read response.
var res Response
err = cborutil.ReadCborRPC(
// FIXME: Extract constants.
bufio.NewReader(incrt.New(stream, READ_RES_MIN_SPEED, READ_RES_DEADLINE)),
&res)
if err != nil {
@ -423,7 +422,7 @@ func (client *BlockSync) RemovePeer(p peer.ID) {
// getShuffledPeers returns a preference-sorted set of peers (by latency
// and failure counting), shuffling the first few peers so we don't always
// pick the same peer.
// FIXME: Merge with the shuffle if we *always* do it.
// FIXME: Consider merging with `shufflePrefix()s`.
func (client *BlockSync) getShuffledPeers() []peer.ID {
peers := client.peerTracker.prefSortedPeers()
shufflePrefix(peers)