fix(tools.custom_builder): Handle multiple instance of the same plugin correctly

tools/custom_builder/config.go

@@ -18,7 +18,7 @@ type instance struct {
 	category   string
 	name       string
 	enabled    bool
-	dataformat string
+	dataformat []string
 }
 
 type selection struct {
@@ -81,27 +81,27 @@ func (s *selection) Filter(p packageCollection) (*packageCollection, error) {
 			// case this plugin supports a data-format setting but the user
 			// didn't set it.
 			for _, instance := range instances {
-				parser := pkg.DefaultParser
-				serializer := pkg.DefaultSerializer
-				if instance.dataformat != "" {
+				for _, dataformat := range instance.dataformat {
 					switch category {
 					case "inputs":
-						parser = instance.dataformat
+						implicitlyConfigured["parsers."+dataformat] = true
 					case "processors":
-						parser = instance.dataformat
+						implicitlyConfigured["parsers."+dataformat] = true
 						// The execd processor requires both a parser and serializer
 						if pkg.Plugin == "execd" {
-							serializer = instance.dataformat
+							implicitlyConfigured["serializers."+dataformat] = true
 						}
 					case "outputs":
-						serializer = instance.dataformat
+						implicitlyConfigured["serializers."+dataformat] = true
 					}
 				}
-				if parser != "" {
-					implicitlyConfigured["parsers."+parser] = true
-				}
-				if serializer != "" {
-					implicitlyConfigured["serializers."+serializer] = true
+				if len(instance.dataformat) == 0 {
+					if pkg.DefaultParser != "" {
+						implicitlyConfigured["parsers."+pkg.DefaultParser] = true
+					}
+					if pkg.DefaultSerializer != "" {
+						implicitlyConfigured["serializers."+pkg.DefaultSerializer] = true
+					}
 				}
 			}
 		}
@@ -215,7 +215,9 @@ func (s *selection) extractPluginsFromConfig(buf []byte) error {
 						option := kv.Value.(*ast.String)
 						dataformat = option.Value
 					}
-					cfg.dataformat = dataformat
+					if dataformat != "" {
+						cfg.dataformat = append(cfg.dataformat, dataformat)
+					}
 				}
 			}
 			s.plugins[key] = append(s.plugins[key], cfg)

tools/custom_builder/main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"bytes"
+	"errors"
 	"flag"
 	"fmt"
 	"log"
@@ -62,101 +63,116 @@ func usage() {
 	fmt.Fprintln(flag.CommandLine.Output(), "")
 }
 
-func main() {
-	var dryrun, showtags, migrations, quiet bool
-	var configFiles, configDirs []string
+type cmdConfig struct {
+	dryrun      bool
+	showtags    bool
+	migrations  bool
+	quiet       bool
+	root        string
+	configFiles []string
+	configDirs  []string
+}
 
+func main() {
+	var cfg cmdConfig
 	flag.Func("config",
 		"Import plugins from configuration file (can be used multiple times)",
 		func(s string) error {
-			configFiles = append(configFiles, s)
+			cfg.configFiles = append(cfg.configFiles, s)
 			return nil
 		},
 	)
 	flag.Func("config-dir",
 		"Import plugins from configs in the given directory (can be used multiple times)",
 		func(s string) error {
-			configDirs = append(configDirs, s)
+			cfg.configDirs = append(cfg.configDirs, s)
 			return nil
 		},
 	)
-	flag.BoolVar(&dryrun, "dry-run", false, "Skip the actual building step")
-	flag.BoolVar(&quiet, "quiet", false, "Print fewer log messages")
-	flag.BoolVar(&migrations, "migrations", false, "Include configuration migrations")
-	flag.BoolVar(&showtags, "tags", false, "Show build-tags used")
+	flag.BoolVar(&cfg.dryrun, "dry-run", false, "Skip the actual building step")
+	flag.BoolVar(&cfg.quiet, "quiet", false, "Print fewer log messages")
+	flag.BoolVar(&cfg.migrations, "migrations", false, "Include configuration migrations")
+	flag.BoolVar(&cfg.showtags, "tags", false, "Show build-tags used")
 
 	flag.Usage = usage
 	flag.Parse()
 
-	// Check configuration options
-	if len(configFiles) == 0 && len(configDirs) == 0 {
-		log.Fatalln("No configuration specified!")
-	}
-
-	// Collect all available plugins
-	packages := packageCollection{}
-	if err := packages.CollectAvailable(); err != nil {
-		log.Fatalf("Collecting plugins failed: %v", err)
-	}
-
-	// Import the plugin list from Telegraf configuration files
-	log.Println("Importing configuration file(s)...")
-	cfg, nfiles, err := ImportConfigurations(configFiles, configDirs)
+	tagset, err := process(&cfg)
 	if err != nil {
-		log.Fatalf("Importing configuration(s) failed: %v", err)
+		log.Fatalln(err)
 	}
-	if !quiet {
-		log.Printf("Found %d configuration files...", nfiles)
-	}
-
-	// Check if we do have a config
-	if nfiles == 0 {
-		log.Fatalln("No configuration files loaded!")
-	}
-
-	// Process the plugin list with the given config. This will
-	// only keep the plugins that adhere to the filtering criteria.
-	enabled, err := cfg.Filter(packages)
-	if err != nil {
-		log.Fatalf("Filtering packages failed: %v", err)
-	}
-	if !quiet {
-		enabled.Print()
-	}
-
-	// Extract the build-tags
-	tagset := enabled.ExtractTags()
 	if len(tagset) == 0 {
 		log.Fatalln("Nothing selected!")
 	}
 	tags := "custom,"
-	if migrations {
+	if cfg.migrations {
 		tags += "migrations,"
 	}
 	tags += strings.Join(tagset, ",")
-	if showtags {
+	if cfg.showtags {
 		fmt.Printf("Build tags: %s\n", tags)
 	}
 
-	if !dryrun {
+	if !cfg.dryrun {
 		// Perform the build
 		var out bytes.Buffer
 		makeCmd := exec.Command("make", buildTargets...)
 		makeCmd.Env = append(os.Environ(), "BUILDTAGS="+tags)
 		makeCmd.Stdout = &out
 		makeCmd.Stderr = &out
 
-		if !quiet {
+		if !cfg.quiet {
 			log.Println("Running build...")
 		}
 		if err := makeCmd.Run(); err != nil {
 			fmt.Println(out.String())
 			log.Fatalf("Running make failed: %v", err)
 		}
-		if !quiet {
+		if !cfg.quiet {
 			fmt.Println(out.String())
 		}
-	} else if !quiet {
+	} else if !cfg.quiet {
 		log.Println("DRY-RUN: Skipping build.")
 	}
 }
+
+func process(cmdcfg *cmdConfig) ([]string, error) {
+	// Check configuration options
+	if len(cmdcfg.configFiles) == 0 && len(cmdcfg.configDirs) == 0 {
+		return nil, errors.New("no configuration specified")
+	}
+
+	// Collect all available plugins
+	packages := packageCollection{root: cmdcfg.root}
+	if err := packages.CollectAvailable(); err != nil {
+		return nil, fmt.Errorf("collecting plugins failed: %w", err)
+	}
+
+	// Import the plugin list from Telegraf configuration files
+	log.Println("Importing configuration file(s)...")
+	cfg, nfiles, err := ImportConfigurations(cmdcfg.configFiles, cmdcfg.configDirs)
+	if err != nil {
+		return nil, fmt.Errorf("importing configuration(s) failed: %w", err)
+	}
+	if !cmdcfg.quiet {
+		log.Printf("Found %d configuration files...", nfiles)
+	}
+
+	// Check if we do have a config
+	if nfiles == 0 {
+		return nil, errors.New("no configuration files loaded")
+	}
+
+	// Process the plugin list with the given config. This will
+	// only keep the plugins that adhere to the filtering criteria.
+	enabled, err := cfg.Filter(packages)
+	if err != nil {
+		return nil, fmt.Errorf("filtering packages failed: %w", err)
+	}
+	if !cmdcfg.quiet {
+		enabled.Print()
+	}
+
+	// Extract the build-tags
+	return enabled.ExtractTags(), nil
+}

tools/custom_builder/main_test.go

@@ -0,0 +1,56 @@
+package main
+
+import (
+	"bufio"
+	"io"
+	"log"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestCases(t *testing.T) {
+	// Silence the output
+	log.SetOutput(io.Discard)
+
+	// Get all directories in testdata
+	folders, err := os.ReadDir("testcases")
+	require.NoError(t, err)
+
+	for _, f := range folders {
+		// Only handle folders
+		if !f.IsDir() {
+			continue
+		}
+		configFilename := filepath.Join("testcases", f.Name(), "telegraf.conf")
+		expecedFilename := filepath.Join("testcases", f.Name(), "expected.tags")
+
+		t.Run(f.Name(), func(t *testing.T) {
+			// Read the expected output
+			file, err := os.Open(expecedFilename)
+			require.NoError(t, err)
+			defer file.Close()
+
+			var expected []string
+			scanner := bufio.NewScanner(file)
+			for scanner.Scan() {
+				expected = append(expected, scanner.Text())
+			}
+			require.NoError(t, scanner.Err())
+
+			// Configure the command
+			cfg := &cmdConfig{
+				dryrun:      true,
+				quiet:       true,
+				configFiles: []string{configFilename},
+				root:        "../..",
+			}
+
+			actual, err := process(cfg)
+			require.NoError(t, err)
+			require.EqualValues(t, expected, actual)
+		})
+	}
+}

tools/custom_builder/packages.go

@@ -36,6 +36,7 @@ type packageInfo struct {
 }
 
 type packageCollection struct {
+	root     string
 	packages map[string][]packageInfo
 }
 
@@ -53,7 +54,7 @@ var exceptions = map[string][]packageInfo{
 
 func (p *packageCollection) collectPackagesForCategory(category string) error {
 	var entries []packageInfo
-	pluginDir := filepath.Join("plugins", category)
+	pluginDir := filepath.Join(p.root, "plugins", category)
 
 	// Add exceptional packages if any
 	if pkgs, found := exceptions[category]; found {

tools/custom_builder/testcases/issue_13592/expected.tags

@@ -0,0 +1,5 @@
+inputs.disk
+inputs.mem
+inputs.swap
+inputs.system
+outputs.datadog

tools/custom_builder/testcases/issue_13592/telegraf.conf

@@ -0,0 +1,65 @@
+## Telegraf Configuration for ThinClients
+## /etc/telegraf/telegraf.conf
+
+[global_tags]
+  service_name = "thinclient"
+  env = "prod"
+  team = "planetexpress"
+
+## Configuration for telegraf agent
+[agent]
+  ## Data input and output settings
+  interval = "10s"
+  round_interval = true
+  metric_batch_size = 1000
+  metric_buffer_limit = 10000
+  collection_jitter = "0s"
+  flush_interval = "10s"
+  flush_jitter = "5s"
+
+  ## Logging configuration
+  debug = false
+  quiet = false
+  # emtpy string means log to stderr
+  logfile = ""
+
+  ## host configuration
+  # if emtpty use os.hostname()
+  hostname = ""
+
+  omit_hostname = false
+
+# Configuration for sending metrics to Datadog
+[[outputs.datadog]]
+  ## Datadog API key
+  apikey = "${datadog_secret}"
+
+  ## Connection timeout.
+  timeout = "5s"
+
+
+  ## Write URL override; useful for debugging.
+  url = "${datadog_url}"
+
+## Metrics to log
+
+[[inputs.system]]
+  name_prefix = "dg.systemengineering.thinclient."
+  # default configuration; getting uptime values.
+
+[[inputs.mem]]
+  name_prefix = "dg.systemengineering.thinclient."
+  # no configuration
+
+[[inputs.disk]]
+  name_prefix = "dg.systemengineering.thinclient."
+  ## By default stats will be gathered for all mount points.
+  ## Set mount_points will restrict the stats to only the specified mount points.
+  mount_points = ["/"]
+
+[[inputs.swap]]
+  name_prefix = "dg.systemengineering.thinclient."
+  ## Monitoring SWAP (zswap) usage
+
+  ## Ignore mount points by filesystem type.
+  #ignore_fs = ["tmpfs", "devtmpfs", "devfs", "iso9660", "overlay", "aufs", "squashfs"]

tools/custom_builder/testcases/issue_15627/expected.tags

@@ -0,0 +1,4 @@
+inputs.mqtt_consumer
+outputs.influxdb_v2
+parsers.json_v2
+parsers.value