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telemetry: Record TLS ClientHellos by hash of key of structured data

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Also improve handling of disabled metrics, and record TLS ClientHello
in association with User-Agent
This commit is contained in:
Matthew Holt
2018-05-07 16:09:39 -06:00
parent 518edd3cd4
commit 078770a5a6
7 changed files with 211 additions and 77 deletions
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8
caddyhttp/httpserver/server.go
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@@ -349,8 +349,12 @@ func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
}
}()
// TODO: Somehow report UA string in conjunction with TLS handshake, if any (and just once per connection)
go telemetry.AppendUnique("http_user_agent", r.Header.Get("User-Agent"))
// record the User-Agent string (with a cap on its length to mitigate attacks)
ua := r.Header.Get("User-Agent")
if len(ua) > 512 {
ua = ua[:512]
}
go telemetry.AppendUnique("http_user_agent", ua)
go telemetry.Increment("http_request_count")
// copy the original, unchanged URL into the context