Support consul service meta data

.envrc

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+# ^ added for shellcheck and file-type detection
+
+# Watch & reload direnv on change
+cd devshell || exit
+watch_file devshell.toml
+
+if [[ $(type -t use_flake) != function ]]; then
+  echo "ERROR: use_flake function missing."
+  echo "Please update direnv to v2.30.0 or later."
+  exit 1
+fi
+use flake

.gitignore

@@ -41,3 +41,6 @@ cover.html
 # IDE files
 .idea
 *.iml
+
+# Nix files
+.direnv

Dockerfile

@@ -1,13 +1,13 @@
-FROM golang:1.18
+FROM golang:1.19
 
-ENV CONSUL_VERSION=1.11.4
+ENV CONSUL_VERSION=1.13.3
 
 RUN  apt-get update \
      && apt-get install -y unzip \
      && go install honnef.co/go/tools/cmd/staticcheck@latest
 
 
-RUN export CONSUL_CHECKSUM=5155f6a3b7ff14d3671b0516f6b7310530b509a2b882b95b4fdf25f4219342c8 \
+RUN export CONSUL_CHECKSUM=5370b0b5bf765530e28cb80f90dcb47bd7d6ba78176c1ab2430f56e460ed279c \
     && export archive=consul_${CONSUL_VERSION}_linux_amd64.zip \
     && curl -Lso /tmp/${archive} https://releases.hashicorp.com/consul/${CONSUL_VERSION}/${archive} \
     && echo "${CONSUL_CHECKSUM}  /tmp/${archive}" | sha256sum -c \

config/config.go

@@ -6,7 +6,7 @@ import (
 	"bytes"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"os"
 	"strings"
 
 	"github.com/flynn/json5"
@@ -79,7 +79,7 @@ func RenderConfig(configFlag, renderFlag string) error {
 		fmt.Printf("%s", renderedConfig)
 	} else {
 		var err error
-		if err = ioutil.WriteFile(renderFlag, renderedConfig, 0644); err != nil {
+		if err = os.WriteFile(renderFlag, renderedConfig, 0644); err != nil {
 			return fmt.Errorf("could not write config file: %s", err)
 		}
 	}
@@ -108,7 +108,7 @@ func loadConfigFile(configFlag string) ([]byte, error) {
 	if configFlag == "" {
 		return nil, errors.New("-config flag is required")
 	}
-	data, err := ioutil.ReadFile(configFlag)
+	data, err := os.ReadFile(configFlag)
 	if err != nil {
 		return nil, fmt.Errorf("could not read config file: %s", err)
 	}

config/config_test.go

@@ -1,7 +1,6 @@
 package config
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
@@ -33,6 +32,7 @@ func TestValidConfigJobs(t *testing.T) {
 	assert.Equal(job0.Port, 8080, "config for job0.Port")
 	assert.Equal(job0.Exec, "/bin/serviceA", "config for job0.Exec")
 	assert.Equal(job0.Tags, []string{"tag1", "tag2"}, "config for job0.Tags")
+	assert.Equal(job0.Meta, map[string]string{"keyA": "A"}, "config for job0.Meta")
 	assert.Equal(job0.Restarts, nil, "config for job1.Restarts")
 
 	job1 := cfg.Jobs[1]
@@ -184,8 +184,8 @@ func TestRenderConfigFileStdout(t *testing.T) {
 	temp.Close()
 	os.Stdout = old
 
-	renderedOut, _ := ioutil.ReadFile(fname)
-	renderedFile, _ := ioutil.ReadFile("testJSON.json")
+	renderedOut, _ := os.ReadFile(fname)
+	renderedFile, _ := os.ReadFile("testJSON.json")
 	if string(renderedOut) != string(renderedFile) {
 		t.Fatalf("expected the rendered file and stdout to be identical")
 	}

config/logger/logging_test.go

@@ -1,7 +1,6 @@
 package logger
 
 import (
-	"io/ioutil"
 	"os"
 	"reflect"
 	"strings"
@@ -84,7 +83,7 @@ func TestFileLogger(t *testing.T) {
 	// write a log message
 	logMsg := "this is a test"
 	logrus.Info(logMsg)
-	content, err := ioutil.ReadFile(filename)
+	content, err := os.ReadFile(filename)
 	if err != nil {
 		t.Errorf("Did not expect error: %v", err)
 	}

config/testdata/test.json5

@@ -18,7 +18,10 @@
         interval: 19,
         ttl: 30,
       },
-      tags: ["tag1","tag2"]
+      tags: ["tag1","tag2"],
+      meta: {
+        keyA: "A",
+      }
     },
     {
       name: "serviceB",

control/endpoints.go

@@ -5,7 +5,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"os"
 	"strconv"
@@ -56,7 +55,7 @@ func (pw PostHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 // process. Returns empty response or HTTP422.
 func (e Endpoints) PutEnviron(r *http.Request) (interface{}, int) {
 	var postEnv map[string]string
-	jsonBlob, err := ioutil.ReadAll(r.Body)
+	jsonBlob, err := io.ReadAll(r.Body)
 	defer r.Body.Close()
 	if err != nil {
 		return nil, http.StatusUnprocessableEntity
@@ -110,7 +109,7 @@ func (e Endpoints) PostDisableMaintenanceMode(r *http.Request) (interface{}, int
 // Returns empty response or HTTP422.
 func (e Endpoints) PostMetric(r *http.Request) (interface{}, int) {
 	var postMetrics map[string]interface{}
-	jsonBlob, err := ioutil.ReadAll(r.Body)
+	jsonBlob, err := io.ReadAll(r.Body)
 
 	defer r.Body.Close()
 	if err != nil {

control/endpoints_test.go

@@ -3,7 +3,7 @@ package control
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"net/http/httptest"
 	"os"
@@ -65,7 +65,7 @@ func TestPostHandler(t *testing.T) {
 		ph.ServeHTTP(w, req)
 		resp := w.Result()
 		defer resp.Body.Close()
-		body, _ := ioutil.ReadAll(resp.Body)
+		body, _ := io.ReadAll(resp.Body)
 		status := resp.StatusCode
 		return status, string(body)
 	}

core/app_test.go

@@ -2,7 +2,6 @@ package core
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"strings"
 	"testing"
@@ -152,7 +151,7 @@ func TestReloadConfig(t *testing.T) {
 // write the configuration to a tempfile. caller is responsible
 // for calling 'defer os.Remove(f.Name())' when done
 func testCfgToTempFile(t *testing.T, text string) *os.File {
-	f, err := ioutil.TempFile(".", "test-")
+	f, err := os.CreateTemp(".", "test-")
 	if err != nil {
 		t.Fatal(err)
 	}

devshell/.gitignore

@@ -0,0 +1 @@
+/.direnv/

devshell/devshell.toml

@@ -0,0 +1,4 @@
+# https://numtide.github.io/devshell
+[[commands]]
+package = "devshell.cli"
+help = "Per project developer environments"

devshell/flake.nix

@@ -0,0 +1,24 @@
+{
+  description = "virtual environments";
+
+  inputs.devshell.url = "github:numtide/devshell";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+
+  outputs = { self, flake-utils, devshell, nixpkgs }:
+    flake-utils.lib.eachDefaultSystem (system: {
+      devShell =
+        let pkgs = import nixpkgs {
+          inherit system;
+
+          overlays = [ devshell.overlay ];
+        };
+        in
+        pkgs.devshell.mkShell {
+          imports = [ (pkgs.devshell.importTOML ./devshell.toml) ];
+          devshell.packages = with pkgs; [
+            go
+            gnumake
+          ];
+        };
+    });
+}

discovery/consul_test.go

@@ -84,6 +84,7 @@ func TestWithConsul(t *testing.T) {
 	t.Run("TestConsulReregister", testConsulReregister(testServer))
 	t.Run("TestConsulCheckForChanges", testConsulCheckForChanges(testServer))
 	t.Run("TestConsulEnableTagOverride", testConsulEnableTagOverride(testServer))
+	t.Run("testConsulTagsMeta", testConsulTagsMeta(testServer))
 }
 
 func testConsulTTLPass(testServer *TestServer) func(*testing.T) {
@@ -146,6 +147,39 @@ func testConsulReregister(testServer *TestServer) func(*testing.T) {
 	}
 }
 
+func contains(s []string, str string) bool {
+	for _, v := range s {
+		if v == str {
+			return true
+		}
+	}
+
+	return false
+}
+
+func testConsulTagsMeta(testServer *TestServer) func(*testing.T) {
+	return func(t *testing.T) {
+		consul, _ := NewConsul(testServer.HTTPAddr)
+		name := "TestConsulReregister"
+		service := generateServiceDefinition(name, consul)
+		id := service.ID
+
+		service.SendHeartbeat() // force registration and 1st heartbeat
+		services, _ := consul.Agent().Services()
+		svc := services[id]
+		if !contains(svc.Tags, "a") || !contains(svc.Tags, "b") {
+			t.Fatalf("first tag must containt a & b but is %s", svc.Tags)
+		}
+		if svc.Meta["keyA"] != "A" {
+			t.Fatalf("first meta must containt keyA:A but is %s", svc.Meta["keyA"])
+		}
+		if svc.Meta["keyB"] != "B" {
+			t.Fatalf("first meta must containt keyB:B but is %s", svc.Meta["keyB"])
+		}
+
+	}
+}
+
 func testConsulCheckForChanges(testServer *TestServer) func(*testing.T) {
 	return func(t *testing.T) {
 		backend := "TestConsulCheckForChanges"
@@ -211,5 +245,10 @@ func generateServiceDefinition(serviceName string, consul *Consul) *ServiceDefin
 		TTL:           5,
 		Port:          9000,
 		Consul:        consul,
+		Tags:          []string{"a", "b"},
+		Meta: map[string]string{
+			"keyA": "A",
+			"keyB": "B",
+		},
 	}
 }

discovery/service.go

@@ -15,6 +15,7 @@ type ServiceDefinition struct {
 	Port                           int
 	TTL                            int
 	Tags                           []string
+	Meta                           map[string]string
 	InitialStatus                  string
 	IPAddress                      string
 	EnableTagOverride              bool
@@ -93,6 +94,7 @@ func (service *ServiceDefinition) registerService(status string) error {
 			ID:                service.ID,
 			Name:              service.Name,
 			Tags:              service.Tags,
+			Meta:              service.Meta,
 			Port:              service.Port,
 			Address:           service.IPAddress,
 			EnableTagOverride: service.EnableTagOverride,

docs/30-configuration/32-configuration-file.md

@@ -60,6 +60,10 @@ The following is a completed example of the JSON5 file configuration schema, wit
         "app",
         "prod"
       ],
+      meta: {
+        keyA: "A",
+        keyB: "B",
+      },
       interfaces: [
         "eth0",
         "eth1[1]",