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api: add follow param to file stream endpoint #6049

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merged 1 commit into from
Aug 1, 2019
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@tgross tgross commented Jul 31, 2019

The /v1/client/fs/stream endpoint supports tailing a file by writing chunks out as they come in. But not all browsers support streams (ex IE11) so we need to be able to tail a file without streaming.

The fs stream and logs endpoint use the same implementation for filesystem streaming under the hood, but the fs stream always passes the follow parameter set to true. This adds the same toggle to the fs stream endpoint that we have for logs. It defaults to true for backwards compatibility.

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hashicorp-cla commented Jul 31, 2019

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Yay - first PR! Found a minor style nit-picking and test condition, but not blockers. Merge away if you feel you've addressed them.

command/agent/fs_endpoint.go Outdated Show resolved Hide resolved
command/agent/fs_endpoint_test.go Outdated Show resolved Hide resolved
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very minor nitpick, looks good to me 🎉

you can update the documentation /api/client.html#stream-file and changelog in this PR or a follow-up PR.

@@ -210,10 +213,15 @@ func (s *HTTPServer) Stream(resp http.ResponseWriter, req *http.Request) (interf
return nil, fileNameNotPresentErr
}

if followStr := q.Get("follow"); followStr != "" {
if follow, err = strconv.ParseBool(followStr); err != nil {
return nil, fmt.Errorf("Failed to parse follow field to boolean: %v", err)
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we strive (but sometimes fail) to start error messages with lower-case

@tgross tgross force-pushed the b-fs-stream-folllow branch from 293d212 to 8c95660 Compare July 31, 2019 19:48
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tgross commented Jul 31, 2019

@notnoop @cgbaker I've addressed your comments, but I just wanted to have y'all take a second look before merging as this is my first PR (including the doc & changelog changes).

@tgross tgross added this to the 0.10.0 milestone Jul 31, 2019
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LGTM

CHANGELOG.md Outdated
@@ -2,6 +2,7 @@

IMPROVEMENTS:
* agent: allow the job GC interval to be configured [[GH-5978](https://github.com/hashicorp/nomad/issues/5978)]
* api: add follow parameter to file streaming endpoint to support older browsers [[GH-6049](https://github.com/hashicorp/nomad/pull/6049]
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i think this is missing a closing parenthesis
these are easy to mess up by copy-pasting. we tend to use [GH-####] and then run make changelogfmt

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Ah, thanks for catching that. Done.

I'll merge this once CI gives the 👍 again.

The `/v1/client/fs/stream endpoint` supports tailing a file by writing
chunks out as they come in. But not all browsers support streams
(ex IE11) so we need to be able to tail a file without streaming.

The fs stream and logs endpoint use the same implementation for
filesystem streaming under the hood, but the fs stream always passes
the `follow` parameter set to true. This adds the same toggle to the
fs stream endpoint that we have for logs. It defaults to true for
backwards compatibility.
@tgross tgross force-pushed the b-fs-stream-folllow branch from 8c95660 to 41dc6ba Compare July 31, 2019 20:50
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lgtm. Merge away :).

@tgross tgross merged commit 6c2392c into master Aug 1, 2019
@tgross tgross deleted the b-fs-stream-folllow branch August 1, 2019 12:35
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4 participants