{"action":"created","comment":{"url":"https://api.github.com/repos/weaveworks/scope/pulls/comments/40280780","id":40280780,"diff_hunk":"@@ -75,11 +81,11 @@ type Conntracker struct {\n }\n \n // NewConntracker creates and starts a new Conntracter\n-func NewConntracker(existingConns bool, args ...string) (*Conntracker, error) {\n+var NewConntracker = func(existingConns bool, args ...string) (Conntracker, error) {","path":"probe/endpoint/conntrack.go","position":21,"original_position":21,"commit_id":"7da599194d6f773e8f48d2a8bc8521abdfb82f6c","original_commit_id":"7da599194d6f773e8f48d2a8bc8521abdfb82f6c","user":{"login":"tomwilkie","id":444037,"avatar_url":"https://avatars.githubusercontent.com/u/444037?v=3","gravatar_id":"","url":"https://api.github.com/users/tomwilkie","html_url":"https://github.com/tomwilkie","followers_url":"https://api.github.com/users/tomwilkie/followers","following_url":"https://api.github.com/users/tomwilkie/following{/other_user}","gists_url":"https://api.github.com/users/tomwilkie/gists{/gist_id}","starred_url":"https://api.github.com/users/tomwilkie/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/tomwilkie/subscriptions","organizations_url":"https://api.github.com/users/tomwilkie/orgs","repos_url":"https://api.github.com/users/tomwilkie/repos","events_url":"https://api.github.com/users/tomwilkie/events{/privacy}","received_events_url":"https://api.github.com/users/tomwilkie/received_events","type":"User","site_admin":false},"body":"Whats the downsides of this approach?  I'm not a huge fan of the factory style, if only because it pollutes potentially clean APIs (it would work better if golang had optional parameters...)\r\n\r\nI guess there are probably cases (this being one) where we would just pass a conntracker to natmapper; that seems clean & obvious, so I'll make that 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