1 files changed, 76 insertions, 0 deletions
diff --git a/libpod/container_log.go b/libpod/container_log.go
new file mode 100644
index 000000000..bfa303e84
--- /dev/null
+++ b/libpod/container_log.go
@@ -0,0 +1,76 @@
+package libpod
+
+import (
+	"os"
+
+	"github.com/containers/libpod/libpod/define"
+	"github.com/containers/libpod/libpod/logs"
+	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
+)
+
+// Log is a runtime function that can read one or more container logs.
+func (r *Runtime) Log(containers []*Container, options *logs.LogOptions, logChannel chan *logs.LogLine) error {
+	for _, ctr := range containers {
+		if err := ctr.ReadLog(options, logChannel); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// ReadLog reads a containers log based on the input options and returns loglines over a channel
+func (c *Container) ReadLog(options *logs.LogOptions, logChannel chan *logs.LogLine) error {
+	// TODO Skip sending logs until journald logs can be read
+	// TODO make this not a magic string
+	if c.LogDriver() == define.JournaldLogging {
+		return c.readFromJournal(options, logChannel)
+	}
+	return c.readFromLogFile(options, logChannel)
+}
+
+func (c *Container) readFromLogFile(options *logs.LogOptions, logChannel chan *logs.LogLine) error {
+	t, tailLog, err := logs.GetLogFile(c.LogPath(), options)
+	if err != nil {
+		// If the log file does not exist, this is not fatal.
+		if os.IsNotExist(errors.Cause(err)) {
+			return nil
+		}
+		return errors.Wrapf(err, "unable to read log file %s for %s ", c.ID(), c.LogPath())
+	}
+	options.WaitGroup.Add(1)
+	if len(tailLog) > 0 {
+		for _, nll := range tailLog {
+			nll.CID = c.ID()
+			nll.CName = c.Name()
+			if nll.Since(options.Since) {
+				logChannel <- nll
+			}
+		}
+	}
+
+	go func() {
+		var partial string
+		for line := range t.Lines {
+			nll, err := logs.NewLogLine(line.Text)
+			if err != nil {
+				logrus.Error(err)
+				continue
+			}
+			if nll.Partial() {
+				partial += nll.Msg
+				continue
+			} else if !nll.Partial() && len(partial) > 1 {
+				nll.Msg = partial
+				partial = ""
+			}
+			nll.CID = c.ID()
+			nll.CName = c.Name()
+			if nll.Since(options.Since) {
+				logChannel <- nll
+			}
+		}
+		options.WaitGroup.Done()
+	}()
+	return nil
+}