bugfix: jsonfile log should be compatible with moby

[fuweid]

Signed-off-by: Wei Fu fuweid89@gmail.com

Ⅰ. Describe what this PR did

source in jsonfile log should be marshaled to stream

Ⅱ. Does this pull request fix one issue?

NONE

Ⅲ. Why don't you add test cases (unit test/integration test)? (你真的觉得不需要加测试吗？)

no need

Ⅳ. Describe how to verify it

The stream will replace the source in the json.

# vagrant @ ubuntu-xenial in ~/go/src/github.com/alibaba/pouch on git:bugfix_jsonfile_marshal_field o [16:35:48]
$ sudo pouch run -it registry.hub.docker.com/library/busybox:latest echo hello
hello

# vagrant @ ubuntu-xenial in ~/go/src/github.com/alibaba/pouch on git:bugfix_jsonfile_marshal_field o [16:36:33]
$ sudo cat /var/lib/pouch/containers/9a420911f1371f9abce896fa3d21b1c4f879e151b1d96f01a64a35232579804c/json.log
{"stream":"stdout","log":"hello\n","time":"2018-10-08T13:15:29.603009864Z"}

Ⅴ. Special notes for reviews

For the existing container, the jsonfile will contain two types json formats, like:

# vagrant @ ubuntu-xenial in ~/go/src/github.com/alibaba/pouch on git:master x [16:46:56]
$ sudo cat /var/lib/pouch/containers/9a420911f1371f9abce896fa3d21b1c4f879e151b1d96f01a64a35232579804c/json.log
{"stream":"stdout","log":"hello\n","time":"2018-10-08T13:15:29.603009864Z"}
{"source":"stdout","line":"hello\n","timestamp":"2018-10-08T08:46:06.605697918Z"}

it will impact the pouch log command and pouch log api to fetch the logs. The log API will not parse the existing data so that it will show empty to the user.

[codecov]

Codecov Report

Merging #2297 into master will increase coverage by 43.37%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           master    #2297       +/-   ##
===========================================
+ Coverage   23.47%   66.84%   +43.37%     
===========================================
  Files         180      211       +31     
  Lines       15860    17195     +1335     
===========================================
+ Hits         3723    11494     +7771     
+ Misses      11860     4310     -7550     
- Partials      277     1391     +1114

Flag	Coverage Δ
#criv1alpha1test	32.01% <60%> (?)
#criv1alpha2test	35.67% <60%> (?)
#integrationtest	39.74% <100%> (?)
#nodee2etest	33.12% <60%> (?)
#unittest	23.47% <100%> (ø)	⬆️

Impacted Files	Coverage Δ
daemon/logger/jsonfile/encode.go	80.45% <100%> (+25.28%)	⬆️
cri/stream/httpstream/spdy/upgrade.go	54.28% <0%> (ø)
cri/stream/remotecommand/httpstream.go	46.63% <0%> (ø)
cri/criservice.go	55.95% <0%> (ø)
lxcfs/lxcfs.go	55.55% <0%> (ø)
cri/v1alpha2/service/cri.go	85.71% <0%> (ø)
cri/stream/remotecommand/websocket.go	81.53% <0%> (ø)
cri/stream/remotecommand/attach.go	66.66% <0%> (ø)
cri/stream/portforward/portforward.go	50% <0%> (ø)
pkg/jsonstream/image_progress.go	0% <0%> (ø)
... and 151 more

[allencloud]

I found that in Moby's API, the log is like the following

{"log":"alecthomas/gometalinter info found version: 2.0.11 for v2.0.11/linux/amd64\r\n","stream":"stdout","time":"2018-09-29T09:44:06.296939861Z"}

The struct has a field of log, stream and time.

While in your commit, there are line, timestamp and stream.

Incompatibility happens. @fuweid

[Ace-Tang]

Checkd in docker 1.12.6,

// JSONLog represents a log message, typically a single entry from a given log stream.
// JSONLogs can be easily serialized to and from JSON and support custom formatting.
type JSONLog struct {
    // Log is the log message
    Log string `json:"log,omitempty"`
    // Stream is the log source
    Stream string `json:"stream,omitempty"`
    // Created is the created timestamp of log
    Created time.Time `json:"time"`
    // Attrs is the list of extra attributes provided by the user
    Attrs map[string]string `json:"attrs,omitempty"`
}