Add timestamp header for New Relic request queue #1672
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| /** | ||
| * Returns the target service requested based on the supplied [[Path]]. |
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looks like Scalariform modified this and I committed it by mistake. will fix.
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| val downstream = Downstream.mk("dog") { | ||
| req => | ||
| req.headerMap.keys must contain ("x-request-start") |
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maybe also check that the value can be parsed as a long?
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I originally had wanted to test using Time.withCurrentTimeAt but that wasn't practical in the e2e test; that seems like a good compromise.
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| val DefaultHeader: String = "X-Request-Start" | ||
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| case class Param(header: String) { |
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I think this param should contain an Option[String] so that this filter can be disabled. (and it should be disabled by default)
| */ | ||
| object TimestampHeaderFilter { | ||
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| val DefaultHeader: String = "X-Request-Start" |
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I don't think we need this since this should be disabled by default
| next: ServiceFactory[Request, Response] | ||
| ): ServiceFactory[Request, Response] = { | ||
| val Param(header) = param | ||
| filter(header) andThen next |
| } | ||
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| def filter(header: String): Filter[Request, Response, Request, Response] = | ||
| (req: Request, svc: Service[Request, Response]) => { |
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| val c = upstream(s) | ||
| try { | ||
| val resp = await(c(req)) |
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to ensure that this request was even routed to the downstream correctly, should assert the status code is ok
| val resp = await(c(req)) | ||
| } finally { | ||
| await(c.close()) | ||
| await(s.close()) |
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close the downstream server too
| def filter(header: String): Filter[Request, Response, Request, Response] = | ||
| (req: Request, svc: Service[Request, Response]) => { | ||
| val reqT = Time.now | ||
| svc(req).map { rsp => |
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it looks like this puts the header on the response, not the request?
| } | ||
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| test("timestampHeader adds header") { | ||
| var headers: Option[HeaderMap] = None |
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I think this might have to be @volatile since it's shared across threads
| /** | ||
| * Adds a timestamp header to a message. | ||
| * | ||
| * This is intended to be used for the New Relic request queue's |
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I think we can remove lines 10-11
| import com.twitter.util.{Future, Time} | ||
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| /** | ||
| * Adds a timestamp header to a message. |
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@adleong I think I've addressed all requested changes? |
## 1.3.1 2017-10-24 * Kubernetes * Fixed a failure to update routing data after restarting watches (#1674). * Ensured that Kubernetes API watch events earlier than the current state are ignored (#1681). * Added support for Istio Mixer precondition checks (#1606). * Removed spurious error message logging from Consul namer (#1682). * Changed DNS SRV record namer to use system DNS resolver configuration (#1679). * Added `timestampHeader` configuration to support New Relic request queue (#1672).
As discussed in #1664 (comment), the New Relic request queue uses a
X-Request-Startheader with a timestamp to measure latency. I've added a filter that allows Linkerd to add such a header to outbound requests. I've added unit and end-to-end tests for this feature, and added the header configuration to the config docs.