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27bd6842f8
Logging plugins use the same HTTP interface as other plugins for basic
command operations meanwhile actual logging operations are handled (on
Unix) via a fifo.
The plugin interface looks like so:
```go
type loggingPlugin interface {
StartLogging(fifoPath string, loggingContext Context) error
StopLogging(fifoPath)
```
This means a plugin must implement `LoggingDriver.StartLogging` and
`LoggingDriver.StopLogging` endpoints and be able to consume the passed
in fifo.
Logs are sent via stream encoder to the fifo encoded with protobuf.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
20 lines
459 B
Go
20 lines
459 B
Go
// +build linux solaris freebsd
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package logger
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import (
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"context"
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"io"
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"github.com/pkg/errors"
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"github.com/tonistiigi/fifo"
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"golang.org/x/sys/unix"
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)
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func openPluginStream(a *pluginAdapter) (io.WriteCloser, error) {
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f, err := fifo.OpenFifo(context.Background(), a.fifoPath, unix.O_WRONLY|unix.O_CREAT|unix.O_NONBLOCK, 0700)
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if err != nil {
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return nil, errors.Wrapf(err, "error creating i/o pipe for log plugin: %s", a.Name())
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}
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return f, nil
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}
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