Add the sub-command service of command dependency (#113)

Author: JarvisG495

README.md

@@ -564,6 +564,22 @@ You can imitate the content of [the default template file](examples/global.yml)
 
 ### `dependency`
 
+#### `service`
+
+<details>
+
+<summary>dependency service <service-id> [--start=start-time] [--end=end-time]</summary>
+
+`dependency service` shows all the dependencies of given `[service-id]` in the time range of `[start, end]`.
+
+| argument | description | default |
+| :--- | :--- | :--- |
+| `service-id` | The service id whose dependencies are to displayed. |  |
+| `--start` | See [Common options](#common-options) | See [Common options](#common-options) |
+| `--end` | See [Common options](#common-options) | See [Common options](#common-options) |
+
+</details>
+
 #### `endpoint`
 
 <details>

assets/assets.gen.go

@@ -0,0 +1,33 @@
+# Licensed to 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. Apache Software Foundation (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.
+
+query ($serviceId: ID!, $duration: Duration!) {
+    result: getServiceTopology(duration: $duration, serviceId: $serviceId) {
+        nodes {
+            id
+            name
+            type
+            isReal
+        }
+        calls {
+            id
+            source
+            detectPoints
+            target
+        }
+    }
+}

assets/graphqls/dependency/ServiceTopology.graphql

@@ -27,5 +27,6 @@ var Command = cli.Command{
 	Usage:     "Dependency related subcommand",
 	Subcommands: cli.Commands{
 		EndpointCommand,
+		ServiceCommand,
 	},
 }

internal/commands/dependency/dependency.go

@@ -0,0 +1,74 @@
+// Licensed to 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. Apache Software Foundation (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 dependency
+
+import (
+	"fmt"
+
+	"github.com/urfave/cli"
+
+	"github.com/apache/skywalking-cli/internal/commands/interceptor"
+	"github.com/apache/skywalking-cli/internal/flags"
+	"github.com/apache/skywalking-cli/internal/logger"
+	"github.com/apache/skywalking-cli/internal/model"
+
+	"github.com/apache/skywalking-cli/pkg/display"
+	"github.com/apache/skywalking-cli/pkg/display/displayable"
+
+	"github.com/apache/skywalking-cli/pkg/graphql/dependency"
+
+	api "skywalking.apache.org/repo/goapi/query"
+)
+
+var ServiceCommand = cli.Command{
+	Name:      "service",
+	ShortName: "svc",
+	Usage:     "Query the dependencies of given service",
+	ArgsUsage: "<serviceId>",
+	Flags: flags.Flags(
+		flags.DurationFlags,
+	),
+	Before: interceptor.BeforeChain([]cli.BeforeFunc{
+		interceptor.TimezoneInterceptor,
+		interceptor.DurationInterceptor,
+	}),
+
+	Action: func(ctx *cli.Context) error {
+		if ctx.NArg() == 0 {
+			return fmt.Errorf("command service requires serviceId as argument")
+		}
+
+		end := ctx.String("end")
+		start := ctx.String("start")
+		step := ctx.Generic("step")
+
+		duration := api.Duration{
+			Start: start,
+			End:   end,
+			Step:  step.(*model.StepEnumValue).Selected,
+		}
+
+		dependency, err := dependency.ServiceTopology(ctx, ctx.Args().First(), duration)
+
+		if err != nil {
+			logger.Log.Fatalln(err)
+		}
+
+		return display.Display(ctx, &displayable.Displayable{Data: dependency})
+	},
+}

internal/commands/dependency/service.go

@@ -38,3 +38,15 @@ func EndpointDependency(ctx *cli.Context, endpointID string, duration api.Durati
 
 	return response["result"], err
 }
+
+func ServiceTopology(ctx *cli.Context, serviceID string, duration api.Duration) (api.Topology, error) {
+	var response map[string]api.Topology
+
+	request := graphql.NewRequest(assets.Read("graphqls/dependency/ServiceTopology.graphql"))
+	request.Var("serviceId", serviceID)
+	request.Var("duration", duration)
+
+	err := client.ExecuteQuery(ctx, request, &response)
+
+	return response["result"], err
+}

pkg/graphql/dependency/dependency.go

@@ -66,3 +66,8 @@ ${swctl} --display=json trace ls >/dev/null 2>&1
 
 # Test `dashboard global`
 ${swctl} --display=json db g >/dev/null 2>&1
+
+# Test `dependency`
+${swctl} --display=json dependency service "test" > /dev/null 2>&1
+
+${swctl} --display=json dependency endpoint "test" > /dev/null 2>&1