Changes on function/metric loggers (#343)

* initial fix logger

* dix DefaultFuncLogger

* fix runner and tests

* reverting: sending async task stdout to func logger

api/runner/metric_logger.go

@@ -0,0 +1,53 @@
+package runner
+
+import (
+	"context"
+	"time"
+
+	"github.com/Sirupsen/logrus"
+	"github.com/iron-io/runner/common"
+)
+
+type MetricLogger interface {
+	Log(context.Context, map[string]interface{})
+	LogCount(context.Context, string, int)
+	LogGauge(context.Context, string, int)
+	LogTime(context.Context, string, time.Duration)
+}
+
+type Metric map[string]interface{}
+
+func NewMetricLogger() MetricLogger {
+	return &DefaultMetricLogger{}
+}
+
+type DefaultMetricLogger struct{}
+
+func (l *DefaultMetricLogger) Log(ctx context.Context, metric map[string]interface{}) {
+	log := common.Logger(ctx)
+	log.WithFields(logrus.Fields(metric)).Info()
+}
+
+func (l *DefaultMetricLogger) LogCount(ctx context.Context, name string, value int) {
+	l.Log(ctx, Metric{
+		"name":  name,
+		"value": value,
+		"type":  "count",
+	})
+}
+
+func (l *DefaultMetricLogger) LogTime(ctx context.Context, name string, value time.Duration) {
+	l.Log(ctx, Metric{
+		"name":  name,
+		"value": value,
+		"type":  "time",
+	})
+}
+
+func (l *DefaultMetricLogger) LogGauge(ctx context.Context, name string, value int) {
+	l.Log(ctx, Metric{
+		"name":  name,
+		"value": value,
+		"type":  "gauge",
+	})
+}