post metric command

.gitignore

@@ -19,3 +19,6 @@
 
 # Go workspace file
 go.work
+
+# config file for otlc
+otlc.yaml

LICENSE

@@ -0,0 +1,7 @@
+Copyright 2023 ASAKURA Kazuki
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

@@ -0,0 +1,15 @@
+# otlc
+
+"otlc" is a command line tool that allows you to easily post metrics by OTLP. It acts as a simple exporter and helps you validate the OTLP endpoint.
+
+## installation
+
+WIP
+
+## run
+
+### post metrics
+
+```sh
+otlc metrics post --conf ./otlc.yaml --name awesome_gauge --attributes hoge=poyo,fuga=1 --value 123.45
+```

cmd/metrics.go

@@ -0,0 +1,15 @@
+package cmd
+
+import (
+	"github.com/spf13/cobra"
+)
+
+func NewMetricsCmd() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "metrics",
+		Short: "Command for OpenTelemetry Metrics",
+	}
+	cmd.AddCommand(NewMetricsPostCmd())
+
+	return cmd
+}

cmd/metrics_post.go

@@ -0,0 +1,54 @@
+package cmd
+
+import (
+	"log"
+
+	"github.com/Arthur1/otlc/metrics"
+	"github.com/spf13/cobra"
+)
+
+func NewMetricsPostCmd() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "post",
+		Short: "Post a metric",
+		Long:  `Post a metric using OTLP. Currently, only gauge is supported.`,
+		Run: func(cmd *cobra.Command, args []string) {
+			name, err := cmd.Flags().GetString("name")
+			if err != nil {
+				log.Fatalln(err)
+			}
+			value, err := cmd.Flags().GetFloat64("value")
+			if err != nil {
+				log.Fatalln(err)
+			}
+			description, err := cmd.Flags().GetString("description")
+			if err != nil {
+				log.Fatalln(err)
+			}
+			attributes, err := cmd.Flags().GetStringToString("attributes")
+			if err != nil {
+				log.Fatalln(err)
+			}
+
+			p := metrics.NewPoster(config.Endpoint, config.Headers)
+			if err := p.Post(&metrics.PostParams{
+				Name:           name,
+				Description:    description,
+				DataPointAttrs: attributes,
+				DataPointValue: value,
+			}); err != nil {
+				log.Fatalln(err)
+			}
+		},
+	}
+
+	cmd.Flags().Float64P("value", "v", 0, "metric value")
+	cmd.Flags().StringP("type", "t", "gauge", "metric value type")
+	cmd.Flags().StringP("name", "n", "", "metric name")
+	cmd.Flags().StringP("description", "d", "", "metric description")
+	cmd.Flags().StringToStringP("attributes", "a", nil, "metric datapoint attributes. format: key1=value1,key2=value2")
+	cmd.MarkFlagRequired("value")
+	cmd.MarkFlagRequired("name")
+
+	return cmd
+}

cmd/root.go

@@ -1,51 +1,51 @@
-/*
-Copyright © 2023 NAME HERE <EMAIL ADDRESS>
-
-*/
 package cmd
 
 import (
+	"log"
 	"os"
 
 	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
 )
 
+type Config struct {
+	Endpoint string            `yaml:"endpoint"`
+	Headers  map[string]string `yaml:"headers"`
+}
 
+var configFile string
+var config Config
 
-// rootCmd represents the base command when called without any subcommands
-var rootCmd = &cobra.Command{
-	Use:   "otlc",
-	Short: "A brief description of your application",
-	Long: `A longer description that spans multiple lines and likely contains
-examples and usage of using your application. For example:
+func NewRootCmd() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "otlc",
+		Short: "otlc: Command Line Tool of OpenTelemetry Protocol",
+		Long: `"otlc" is a command line tool that allows you to easily post metrics by OTLP.
+It acts as a simple exporter and helps you validate the OTLP endpoint.`,
+	}
 
-Cobra is a CLI library for Go that empowers applications.
-This application is a tool to generate the needed files
-to quickly create a Cobra application.`,
-	// Uncomment the following line if your bare application
-	// has an action associated with it:
-	// Run: func(cmd *cobra.Command, args []string) { },
+	cmd.PersistentFlags().StringVar(&configFile, "conf", "otlc.yaml", "config file path")
+	cobra.OnInitialize(initConfig)
+
+	cmd.AddCommand(NewMetricsCmd())
+	return cmd
 }
 
 // Execute adds all child commands to the root command and sets flags appropriately.
 // This is called by main.main(). It only needs to happen once to the rootCmd.
 func Execute() {
-	err := rootCmd.Execute()
+	err := NewRootCmd().Execute()
 	if err != nil {
 		os.Exit(1)
 	}
 }
 
-func init() {
-	// Here you will define your flags and configuration settings.
-	// Cobra supports persistent flags, which, if defined here,
-	// will be global for your application.
-
-	// rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.otlc.yaml)")
-
-	// Cobra also supports local flags, which will only run
-	// when this action is called directly.
-	rootCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
+func initConfig() {
+	viper.SetConfigFile(configFile)
+	if err := viper.ReadInConfig(); err != nil {
+		log.Fatalln(err)
+	}
+	if err := viper.Unmarshal(&config); err != nil {
+		log.Fatalln(err)
+	}
 }
-
-

go.mod

@@ -3,7 +3,42 @@ module github.com/Arthur1/otlc
 go 1.20
 
 require (
+	github.com/spf13/cobra v1.7.0
+	github.com/spf13/viper v1.16.0
+	go.opentelemetry.io/otel v1.16.0
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v0.39.0
+	go.opentelemetry.io/otel/metric v1.16.0
+	go.opentelemetry.io/otel/sdk/metric v0.39.0
+	google.golang.org/grpc v1.55.0
+)
+
+require (
+	github.com/cenkalti/backoff/v4 v4.2.1 // indirect
+	github.com/fsnotify/fsnotify v1.6.0 // indirect
+	github.com/go-logr/logr v1.2.4 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.7.0 // indirect
+	github.com/hashicorp/hcl v1.0.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
-	github.com/spf13/cobra v1.7.0 // indirect
+	github.com/magiconair/properties v1.8.7 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/pelletier/go-toml/v2 v2.0.8 // indirect
+	github.com/spf13/afero v1.9.5 // indirect
+	github.com/spf13/cast v1.5.1 // indirect
+	github.com/spf13/jwalterweatherman v1.1.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/subosito/gotenv v1.4.2 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/internal/retry v1.16.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric v0.39.0 // indirect
+	go.opentelemetry.io/otel/sdk v1.16.0 // indirect
+	go.opentelemetry.io/otel/trace v1.16.0 // indirect
+	go.opentelemetry.io/proto/otlp v0.19.0 // indirect
+	golang.org/x/net v0.10.0 // indirect
+	golang.org/x/sys v0.8.0 // indirect
+	golang.org/x/text v0.9.0 // indirect
+	google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1 // indirect
+	google.golang.org/protobuf v1.30.0 // indirect
+	gopkg.in/ini.v1 v1.67.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )