gRPC implementation of mock2 collector

plugin/collector/snap-plugin-collector-mock2-grpc/README.md

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+<!--
+http://www.apache.org/licenses/LICENSE-2.0.txt
+
+
+Copyright 2015 Intel Corporation
+
+Licensed 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.
+-->
+#PLEASE NOTE: These are not example plugins
+
+The contents of `plugin/` are used as part of our testing framework. If you are looking for examples of how to write a plugin for Snap, review the [Plugin Authoring documentation](/docs/PLUGIN_AUTHORING.md).
+
+Curious what plugins are under development? See the `plugin-wishlist` label in [our issue backlog](https://github.com/intelsdi-x/snap/labels/plugin-wishlist).

plugin/collector/snap-plugin-collector-mock2-grpc/main.go

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+/*
+http://www.apache.org/licenses/LICENSE-2.0.txt
+
+
+Copyright 2015 Intel Corporation
+
+Licensed 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 main
+
+import (
+	"time"
+
+	// Import the snap plugin library
+	"github.com/intelsdi-x/snap-plugin-lib-go/v1/plugin"
+	// Import our collector plugin implementation
+	"github.com/intelsdi-x/snap/plugin/collector/snap-plugin-collector-mock2-grpc/mock"
+)
+
+const (
+	pluginName    = "mock-grpc"
+	pluginVersion = 1
+)
+
+func main() {
+	// Provided:
+	//   the definition of the plugin metadata
+	//   the implementation satisfying plugin.CollectorPlugin
+
+	// Start a collector
+	plugin.StartCollector(
+		new(mock.Mock),
+		pluginName,
+		pluginVersion,
+		plugin.CacheTTL(100*time.Millisecond),
+		plugin.RoutingStrategy(plugin.StickyRouter),
+	)
+}

plugin/collector/snap-plugin-collector-mock2-grpc/main_small_test.go

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+// +build small
+
+/*
+http://www.apache.org/licenses/LICENSE-2.0.txt
+
+
+Copyright 2015 Intel Corporation
+
+Licensed 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 main
+
+import (
+	"testing"
+
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+func TestMain(t *testing.T) {
+	Convey("ensure plugin loads and responds", t, func() {
+		So(func() { main() }, ShouldNotPanic)
+	})
+}

plugin/collector/snap-plugin-collector-mock2-grpc/main_test.go

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+// +build legacy
+
+/*
+http://www.apache.org/licenses/LICENSE-2.0.txt
+
+
+Copyright 2015 Intel Corporation
+
+Licensed 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 main
+
+import (
+	"os"
+	"path"
+	"testing"
+
+	"github.com/intelsdi-x/snap/control"
+	"github.com/intelsdi-x/snap/core"
+	"github.com/intelsdi-x/snap/plugin/helper"
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+var (
+	PluginName = "snap-plugin-collector-mock2-grpc"
+	PluginType = "collector"
+	SnapPath   = os.ExpandEnv(os.Getenv("SNAP_PATH"))
+	PluginPath = path.Join(SnapPath, "plugin", PluginName)
+)
+
+func TestMockPluginLoad(t *testing.T) {
+	// These tests only work if SNAP_PATH is known.
+	// It is the responsibility of the testing framework to
+	// build the plugins first into the build dir.
+	Convey("make sure plugin has been built", t, func() {
+		err := helper.CheckPluginBuilt(SnapPath, PluginName)
+		So(err, ShouldBeNil)
+
+		Convey("ensure plugin loads and responds", func() {
+			c := control.New(control.GetDefaultConfig())
+			c.Start()
+			rp, _ := core.NewRequestedPlugin(PluginPath)
+			_, err := c.Load(rp)
+
+			So(err, ShouldBeNil)
+		})
+
+	})
+}

plugin/collector/snap-plugin-collector-mock2-grpc/mock/README.md

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+<!--
+http://www.apache.org/licenses/LICENSE-2.0.txt
+
+
+Copyright 2015 Intel Corporation
+
+Licensed 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.
+-->
+#PLEASE NOTE: These are not example plugins
+
+The contents of `plugin/` are used as part of our testing framework. If you are looking for examples of how to write a plugin for Snap, review the [Plugin Authoring documentation](/docs/PLUGIN_AUTHORING.md).
+
+Curious what plugins are under development? See the `plugin-wishlist` label in [our issue backlog](https://github.com/intelsdi-x/snap/labels/plugin-wishlist).

plugin/collector/snap-plugin-collector-mock2-grpc/mock/mock.go

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+/*
+http://www.apache.org/licenses/LICENSE-2.0.txt
+
+
+Copyright 2015 Intel Corporation
+
+Licensed 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 mock
+
+import (
+	"fmt"
+	"log"
+	"math/rand"
+	"time"
+
+	"github.com/intelsdi-x/snap-plugin-lib-go/v1/plugin"
+)
+
+// Mock collector implementation used for testing
+type Mock struct {
+}
+
+// list of available hosts
+var availableHosts = getAllHostnames()
+
+// CollectMetrics collects metrics for testing
+func (f *Mock) CollectMetrics(mts []plugin.Metric) ([]plugin.Metric, error) {
+	for _, p := range mts {
+		log.Printf("collecting %+v\n", p)
+	}
+
+	rand.Seed(time.Now().UTC().UnixNano())
+	metrics := []plugin.Metric{}
+	for i := range mts {
+		if _, err := mts[i].Config.GetBool("long_print"); err == nil {
+			letterBytes := "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+			longLine := []byte{}
+			for i := 0; i < 8193; i++ {
+				longLine = append(longLine, letterBytes[rand.Intn(len(letterBytes))])
+			}
+			fmt.Println(string(longLine))
+		}
+		if _, err := mts[i].Config.GetBool("panic"); err == nil {
+			panic("Oops!")
+		}
+
+		if isDynamic, _ := mts[i].Namespace.IsDynamic(); isDynamic {
+			requestedHosts := []string{}
+
+			if mts[i].Namespace[2].Value == "*" {
+				// when dynamic element is not specified (equals an asterisk)
+				// then consider all available hosts as requested hosts
+				requestedHosts = append(requestedHosts, availableHosts...)
+			} else {
+				// when the dynamic element is specified
+				// then consider this specified host as requested hosts
+				host := mts[i].Namespace[2].Value
+
+				// check if specified host is available in system
+				if contains(availableHosts, host) {
+					requestedHosts = append(requestedHosts, host)
+				} else {
+					return nil, fmt.Errorf("requested hostname `%s` is not available (list of available hosts: %s)", host, availableHosts)
+				}
+
+			}
+			// collect data for each of requested hosts
+			for _, host := range requestedHosts {
+				//generate random data
+				data := randInt(65, 90) + 1000
+				// prepare namespace as a copy of incoming dynamic namespace,
+				// but with the set value of dynamic element
+				ns := plugin.NewNamespace()
+				for j, ne := range mts[i].Namespace {
+					if ne.IsDynamic() {
+						ns = ns.AddDynamicElement(ne.Name, ne.Description)
+						ns[j].Value = host
+					} else {
+						ns = ns.AddStaticElement(ne.Value)
+					}
+				}
+				// metric with set data, ns, timestamp and the version of the plugin
+				mt := plugin.Metric{
+					Data:      data,
+					Namespace: ns,
+					Timestamp: time.Now(),
+					Unit:      mts[i].Unit,
+					Version:   mts[i].Version,
+				}
+				metrics = append(metrics, mt)
+			}
+
+		} else {
+			data := randInt(65, 90) + 1000
+			mts[i].Data = data
+			mts[i].Timestamp = time.Now()
+			metrics = append(metrics, mts[i])
+		}
+	}
+	return metrics, nil
+}
+
+// GetMetricTypes returns metric types for testing
+func (f *Mock) GetMetricTypes(cfg plugin.Config) ([]plugin.Metric, error) {
+	mts := []plugin.Metric{}
+	if _, err := cfg.GetBool("test-fail"); err == nil {
+		return mts, fmt.Errorf("testing")
+	}
+	if _, err := cfg.GetBool("test"); err == nil {
+		mts = append(mts, plugin.Metric{
+			Namespace:   plugin.NewNamespace("intel", "mock", "test"),
+			Description: "mock description",
+			Unit:        "mock unit",
+		})
+	}
+	if _, err := cfg.GetBool("test-less"); err != nil {
+		mts = append(mts, plugin.Metric{
+			Namespace:   plugin.NewNamespace("intel", "mock", "foo"),
+			Description: "mock description",
+			Unit:        "mock unit",
+		})
+	}
+	mts = append(mts, plugin.Metric{
+		Namespace:   plugin.NewNamespace("intel", "mock", "bar"),
+		Description: "mock description",
+		Unit:        "mock unit",
+	})
+	mts = append(mts, plugin.Metric{
+		Namespace: plugin.NewNamespace("intel", "mock").
+			AddDynamicElement("host", "name of the host").
+			AddStaticElement("baz"),
+		Description: "mock description",
+		Unit:        "mock unit",
+	})
+	return mts, nil
+}
+
+// GetConfigPolicy returns a ConfigPolicy for testing
+func (f *Mock) GetConfigPolicy() (plugin.ConfigPolicy, error) {
+	p := plugin.NewConfigPolicy()
+
+	rule1, err := plugin.NewStringRule("name", false, plugin.SetDefaultString("bob"))
+	if err != nil {
+		return *p, err
+	}
+
+	rule2, err := plugin.NewStringRule("password", true)
+	if err != nil {
+		return *p, err
+	}
+
+	p.AddStringRule([]string{"intel", "mock", "foo"}, rule1)
+	p.AddStringRule([]string{"intel", "mock", "foo"}, rule2)
+
+	return *p, nil
+}
+
+// contains reports whether a given item is found in a slice
+func contains(slice []string, item string) bool {
+	for _, s := range slice {
+		if s == item {
+			return true
+		}
+	}
+	return false
+}
+
+// getAllHostnames returns all available hostnames ('host0', 'host1', ..., 'host9')
+func getAllHostnames() []string {
+	res := []string{}
+	for j := 0; j < 10; j++ {
+		res = append(res, fmt.Sprintf("host%d", j))
+	}
+	return res
+}
+
+// random number generator
+func randInt(min int, max int) int {
+	return min + rand.Intn(max-min)
+}