The `http.Client.Transport` created in `newWebClient` wraps a
chain of `http.RoundTripper` over an underlying `http.Transport`.
Since we cannot guarantee that each `http.RoundTipper` has a
`CloseIdleConnections` method the usage of
`defer clt.CloseIdleConnections()` does not guarantee that the http
connections created during Find/Ping/etc are closed.
To prevent leaking connections implementations of `http.RoundTripper`
have added a `CloseIdleConnections` method added that forwards the
request on to the wrapped interface. The `otelhttp.Transport` does
not implement this method either so care has been taken to wrap it
in a `http.RoundTripper` which will call the root transport in
`enforceCloseIdleConnections`. An upstream issue has been filed
with otelhttp: https://github.com/open-telemetry/opentelemetry-go-contrib/issues/3543
to get the method added to their `Transport` implementation.
This wasn't noticed prior to upgrading to go1.20 becuase prior to
[this](https://github.com/golang/go/commit/4e7e7ae1406c70d9cc0809ec11105a55a60a0b70)
commit the `ReadHeaderTimeout` set on the Proxy web api http.Server
would cause the connection to appear idle and get terminated by the
server.
`TestWebClientClosesIdleConnections` was added to capture the leak
in connections as reported in #22757 and prevent any regressions.
* Enable nolintlint linter
* Fix nolint comments in the api package
* Fix RDP client comment
* Address review comment
Co-authored-by: Alan Parra <alan.parra@goteleport.com>
* Allow unused for nolintlint linter
* Remove redundant casting
* Add comment on why allowed unused is enabled
Co-authored-by: Alan Parra <alan.parra@goteleport.com>
Co-authored-by: Alan Parra <alan.parra@goteleport.com>
* Add Yubikey PrivateKey implementation for use by Teleport clients.
- Add yubikey login logic, reusing previously stored private keys.
- Fix identity file decoding with PIV keys, which sign ecdsa certificates.
- Add libpcsclite-dev pre-req for building on linux.
- Remove unnecessary keys.Signer interface and move its functionality to keys.PrivateKey.
- Move retry and jitter utils to new api/utils/retryutils package.
Update metalinter, fix a few lint warnings and replace deprecated linters.
`deadcode`, `structcheck` and `varcheck` are abandoned and now replaced by [`unused`][1].
Since 1.19, `go fmt` reformats godocs according to https://go.dev/doc/comment. I've done a bulk-reformatting of the codebase to keep the linter happy. Backporting is mostly harmless (the exception being `lib/services/role_test.go`, that for some reason breaks the _old_ linter using the new format).
[1]: https://golangci-lint.run/usage/linters/
* Bump golangci-lint version
* Replace abandoned linters
* Fix bodyclose on lib/auth/github.com
* Fix bodyclose on lib/kube/proxy/streamproto/proto_test.go
* Fix bodyclose on lib/srv/alpnproxy/proxy_test.go
* Fix bodyclose on lib/web/conn_upgrade_test.go
* Silence staticcheck on lib/kube/proxy/forwarder_test.go
* Silence staticcheck on lib/utils/certs_test.go
* Address BuildNameToCertificate deprecation warnings
* Run `go fmt ./...`
* Run `go fmt ./...` on api/
* Ignore formatting in role_test.go
* Remove redundant initializers in lib/srv/uacc/
* Update e/
* Add client side circuit breaker to auth clients
In order to apply back pressure we can utilize a circuit breaker that
monitors error responses from auth server. When tripped it will prevent
all outbound requests to auth for a period of time. This can also help
prevent a potential thundering heard when auth is in an unhealthy state.
By default the circuit breaker will only be tripped if 90% of the
requests made in the monitoring interval fail.
rosstimothy