On Jul 21, 2015, at 4:06 PM, Simon Johansson <simon(a)simonjohansson.com> wrote:

Howdie!

We have some devs who want to be able to trace a request troughout their applications.

user -> a -> b -> c
|
|-> d -> e

When a user makes a request to "a" uuid is generated inside the app, and the request to "b" from "a" will set a header(call it WAKAWAKA to uuid), "b"'s call will passthrough WAKAWAKA to "c" and "d", "d" will passthrough WAKAWAKA to "e". Etc.

We aggregate all RTR logs into ELK so it would be super helpful to them to be able to filter on WAKAWAKA and get all the access logs(and app logs aswell, they mostly use GELF so its easy for them to add whatewher field they want) from the services involved.

I had a quick peek at the gorouter(https://github.com/cloudfoundry/gorouter/blob/76668f5818ea8c089ff52a14fcdfbf703c8e8767/access_log/access_log_record.go#L40 <https://github.com/cloudfoundry/gorouter/blob/76668f5818ea8c089ff52a14fcdfbf703c8e8767/access_log/access_log_record.go#L40>) and it seems like this should be a simple PR.

1. To gorouter.yml add
passthrough_headers:
- WAKAWAKA
- X-Random-Header

2. In makeRecord at the bottom add something like(in psuedo)

data = {}
for header in passthrough_headers:
header_val = r.FormatRequestHeader("X-Forwarded-For")
if header_val:
passthrough_headers[header] = header_val

if data:
fmt.Fprintf(b, data.to_stringified_json())

That would yield a log line like
blurgh.dev.cf.private.domain.com <http://blurgh.dev.cf.private.domain.com/> - [21/07/2015:10:17:05 +0000] "GET /statements?ascending=true&since=2015-06-30T14%3A10%3A03.078Z&skipStatementId=30a88204-0779-4385-9859-e4aabd30baf0 HTTP/1.1" 200 0 17 "-" "NING/1.0" 10.230.31.2:46204 <http://10.230.31.2:46204/> x_forwarded_for:"-" vcap_request_id:1e58195a-cde6-4afd-7f03-43061c9ea91c response_time:0.004927106 app_id:9784cd03-050d-4b74-9e90-5f17134a3f08 {"WAKAWAKA": "Space is the place", "X-Random-Header": "Once upon a midnight dreary, while I pondered weak and weary"}

The reason for a stringified JSON is to make it easy to parse with logstash or other loganalysis tools.

Before I spend time implementing, is this something you would merge?
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