wu-sheng commented on a change in pull request #6: [Feature] Set GraphQL client 
and add service ls command
URL: https://github.com/apache/skywalking-cli/pull/6#discussion_r344433721
 
 

 ##########
 File path: commands/interceptor/duration.go
 ##########
 @@ -0,0 +1,121 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package interceptor
+
+import (
+       "github.com/apache/skywalking-cli/graphql/schema"
+       "github.com/apache/skywalking-cli/logger"
+       "github.com/urfave/cli"
+       "time"
+)
+
+var stepFormats = map[schema.Step]string{
+       schema.StepSecond: "2006-01-02 1504",
+       schema.StepMinute: "2006-01-02 1504",
+       schema.StepHour:   "2006-01-02 15",
+       schema.StepDay:    "2006-01-02",
+       schema.StepMonth:  "2006-01-02",
+}
+
+var supportedTimeLayouts = []string{
+       "2006-01-02 150400",
+       "2006-01-02 1504",
+       "2006-01-02 15",
+       "2006-01-02",
+       "2006-01",
+}
+
+func tryParseTime(unparsed string, parsed *time.Time) error {
+       var possibleError error = nil
+       for _, layout := range supportedTimeLayouts {
+               t, err := time.Parse(layout, unparsed)
+               if err == nil {
+                       *parsed = t
+                       return nil
+               }
+               possibleError = err
+       }
+       return possibleError
+}
+
+// DurationInterceptor sets the duration if absent, and formats it accordingly,
+// see ParseDuration
+func DurationInterceptor(ctx *cli.Context) error {
+       start := ctx.String("start")
+       end := ctx.String("end")
+
+       startTime, endTime, step := ParseDuration(start, end)
+
+       if err := ctx.Set("start", startTime.Format(stepFormats[step])); err != 
nil {
+               return err
+       } else if err := ctx.Set("end", endTime.Format(stepFormats[step])); err 
!= nil {
+               return err
+       } else if err := ctx.Set("step", step.String()); err != nil {
+               return err
+       }
+       return nil
+}
+
+// ParseDuration parses the `start` and `end` to a triplet, (startTime, 
endTime, step)
+// if --start and --end are both absent, then: start := now - 30min; end := now
+// if --start is given, --end is absent, then: end := now
+// if --start is absent, --end is given, then: start := end - 30min
+// NOTE that when either(both) `start` or `end` is(are) given, there is no 
timezone info
+// in the format, (e.g. 2019-11-09 1001), so they'll be considered as 
UTC-based,
+// and generate the missing `start`(`end`) based on the same timezone, UTC
 
 Review comment:
   `TZ` should be considered later, maybe we submit an issue to track?

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