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swarm/network: Keep span across roundtrip #1210
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nonsense
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Feb 8, 2019
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zelig
reviewed
Feb 12, 2019
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Looks way better than before. Now we can see which |
skylenet
approved these changes
Feb 15, 2019
This corrects the previous change which broke the build and was pushed by accident.
This changes default location of the data directory to use the LOCALAPPDATA environment variable, resolving issues with remote home directories an improving compatibility with Cygwin. Fixes #2239 Fixes #2237 Fixes #16437
Package crypto works with or without cgo, which is great. However, to make it work without cgo required setting the build tag `nocgo`. It's common to disable cgo by instead just setting the environment variable `CGO_ENABLED=0`. Setting this environment variable does _not_ implicitly set the build tag `nocgo`. So projects that try to build the crypto package with `CGO_ENABLED=0` will fail. I have done this myself several times. Until today, I had just assumed that this meant that this package requires cgo. But a small build tag change will make this case work. Instead of using `nocgo` and `!nocgo`, we can use `!cgo` and `cgo`, respectively. The `cgo` build tag is automatically set if cgo is enabled, and unset if it is disabled.
Simplifies the transaction presense check to use a function to determine if the transaction is present in the block provided to trace, which originally had a redundant parenthesis and used a `exist` flag to dictate control flow.
acud
approved these changes
Feb 20, 2019
swarm/network/stream/peer.go
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| @@ -83,16 +84,11 @@ func NewPeer(peer *protocols.Peer, streamer *Registry) *Peer { | |||
| clients: make(map[Stream]*client), | |||
| clientParams: make(map[Stream]*clientParams), | |||
| quit: make(chan struct{}), | |||
| spans: sync.Map{}, | |||
| //spans: sync.Map{}, | |||
swarm/network/stream/stream.go
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| @@ -884,6 +887,10 @@ func (r *Registry) Start(server *p2p.Server) error { | |||
| } | |||
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| func (r *Registry) Stop() error { | |||
| r.spans.Range(func(k, v interface{}) bool { | |||
swarm/storage/netstore.go
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| @@ -1,4 +1,4 @@ | |||
| // Copyright 2016 The go-ethereum Authors | |||
| //// Copyright 2016 The go-ethereum Authors | |||
swarm/tracing/tracing.go
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| // FinishSpans calls `Finish()` on all stored spans | ||
| // It should be called on instance shutdown | ||
| func FinishSpans() { | ||
| store.spans.Range(func(k, v interface{}) bool { |
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submitted upstream ethereum/go-ethereum#19140 |
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This PR addresses #1209 (see copy of description below) which is an incremental part of #1181
Until now, the spans are only valid within internal peer contexts, but we may want to trace durations from node makes request to node received delivery.
According to
opentracingsupport, if aSpanis to persist across asynchronous operations, it's the requester's responsibility to remember theSpanandFinish()it accordingly. In other words, aSpancannot be recalled after passing through thetracer.Inject()/tracer.Extract()serialization, only new spans (ChildOf(),FollowFrom()) can be created from theSpanContextthat's passed on.To this end, I've introduced a "store" for spans to be remembered. This "store" is a singleton per swarm instance. It seems to me to belong in the
swarm/tracingpackage, so I put it there.Unlike
LazyChunkReader.Read, we don't know how long a singleRetrieve Requesttook. We should update the spans to record the full duration of a retrieve request, until it is actually delivered on the requestor node.Good
Bad
