update changelog

Reviewed-on: #2
Co-authored-by: Ryan D McGuire <ryand_mcguire@sweetwater.com>
Co-committed-by: Ryan D McGuire <ryand_mcguire@sweetwater.com>

CHANGELOG.md

@@ -0,0 +1,24 @@
+# v0.12.1
+* feat: Implement custom OpenTelemetry span name formatting for HTTP requests.
+* refactor: Streamline OpenTelemetry handler integration by removing custom wrapper.
+
+# v0.12.0
+* feat: Add support for excluding HTTP request paths from logging using configurable regular expressions.
+
+# v0.11.1:
+* docs: Add comprehensive package-level documentation for the `http` package.
+* docs: Improve documentation for the `InitHTTPServer` function.
+* feat: Introduce specific logging for HTTP 204 (No Content) responses, omitting body logging.
+* fix: Enhance error handling and logging for empty or unreadable HTTP response bodies.
+* chore: Refine HTTP response log messages for improved clarity and consistency.
+* docs: Update documentation for the `Flush` method in `LoggingResponseWriter`
+
+# v0.11.0:
+*   Updated `github.com/prometheus/client_golang` dependency to v1.23.0.
+*   Updated `google.golang.org/grpc` dependency to v1.74.2.
+*   Added a `replace` directive for `github.com/prometheus/otlptranslator`.
+*   Renamed `initOTEL` function to `InitOTEL` and added a check to prevent re-initialization.
+*   Improved `dummyHealthCheck` to ensure a positive random duration.
+*   Added comprehensive package, struct, and function comments across `pkg/app`, `pkg/config`, `pkg/logging`, `pkg/otel`, `pkg/srv/grpc`, and `pkg/srv/http` for improved clarity.
+*   Corrected typos in `TODO.md` for "implementing" and "support".
+*   Added a new item to `TODO.md` for early OpenTelemetry initialization.

TODO.md

@@ -1,14 +1,15 @@
 # TODO
 
+- [ ] Add ability to initialize OTEL early (before app runs)
 - [ ] Spruce up the README
-- [ ] Create generic interface for implenting a service
+- [ ] Create generic interface for implementing a service
 - [ ] Create config sample not called demo, so it is more easily reused
 - [ ] Expand config test case to cover GRPC config
 - [ ] Expand tracing
 
 ## Done
 
-- [x] Test and troubleshoot GRPC Gateway supprot
+- [x] Test and troubleshoot GRPC Gateway support
 - [x] Finish implementing GRPC service support
 - [x] Unit tests
 - [x] Pattern for extending config

go.mod

@@ -2,6 +2,8 @@ module gitea.libretechconsulting.com/rmcguire/go-app
 
 go 1.24.2
 
+replace github.com/prometheus/otlptranslator => github.com/prometheus/otlptranslator v0.0.0-20250717125610-8549f4ab4f8f
+
 require (
 	buf.build/go/protovalidate v0.14.0
 	github.com/caarlos0/env/v11 v11.3.1
@@ -27,7 +29,7 @@ require (
 )
 
 require (
-	buf.build/gen/go/bufbuild/protovalidate/protocolbuffers/go v1.36.6-20250717185734-6c6e0d3c608e.1 // indirect
+	buf.build/gen/go/bufbuild/protovalidate/protocolbuffers/go v1.36.7-20250717185734-6c6e0d3c608e.1 // indirect
 	cel.dev/expr v0.24.0 // indirect
 	github.com/antlr4-go/antlr/v4 v4.13.1 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
@@ -51,11 +53,11 @@ require (
 	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.37.0 // indirect
 	go.opentelemetry.io/proto/otlp v1.7.1 // indirect
-	golang.org/x/exp v0.0.0-20250718183923-645b1fa84792 // indirect
-	golang.org/x/net v0.42.0 // indirect
-	golang.org/x/sys v0.34.0 // indirect
-	golang.org/x/text v0.27.0 // indirect
-	google.golang.org/genproto/googleapis/api v0.0.0-20250728155136-f173205681a0 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20250728155136-f173205681a0 // indirect
-	google.golang.org/protobuf v1.36.6 // indirect
+	golang.org/x/exp v0.0.0-20250813145105-42675adae3e6 // indirect
+	golang.org/x/net v0.43.0 // indirect
+	golang.org/x/sys v0.35.0 // indirect
+	golang.org/x/text v0.28.0 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20250811230008-5f3141c8851a // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20250811230008-5f3141c8851a // indirect
+	google.golang.org/protobuf v1.36.7 // indirect
 )

go.sum

@@ -1,5 +1,5 @@
-buf.build/gen/go/bufbuild/protovalidate/protocolbuffers/go v1.36.6-20250717185734-6c6e0d3c608e.1 h1:Lg6klmCi3v7VvpqeeLEER9/m5S8y9e9DjhqQnSCNy4k=
-buf.build/gen/go/bufbuild/protovalidate/protocolbuffers/go v1.36.6-20250717185734-6c6e0d3c608e.1/go.mod h1:avRlCjnFzl98VPaeCtJ24RrV/wwHFzB8sWXhj26+n/U=
+buf.build/gen/go/bufbuild/protovalidate/protocolbuffers/go v1.36.7-20250717185734-6c6e0d3c608e.1 h1:/AZH8sVB6LHv8G+hZlAMCP31NevnesHwYgnlgS5Vt14=
+buf.build/gen/go/bufbuild/protovalidate/protocolbuffers/go v1.36.7-20250717185734-6c6e0d3c608e.1/go.mod h1:eva/VCrd8X7xuJw+JtwCEyrCKiRRASukFqmirnWBvFU=
 buf.build/go/protovalidate v0.14.0 h1:kr/rC/no+DtRyYX+8KXLDxNnI1rINz0imk5K44ZpZ3A=
 buf.build/go/protovalidate v0.14.0/go.mod h1:+F/oISho9MO7gJQNYC2VWLzcO1fTPmaTA08SDYJZncA=
 cel.dev/expr v0.24.0 h1:56OvJKSH3hDGL0ml5uSxZmz3/3Pq4tJ+fb1unVLAFcY=
@@ -135,25 +135,25 @@ go.opentelemetry.io/proto/otlp v1.7.1 h1:gTOMpGDb0WTBOP8JaO72iL3auEZhVmAQg4ipjOV
 go.opentelemetry.io/proto/otlp v1.7.1/go.mod h1:b2rVh6rfI/s2pHWNlB7ILJcRALpcNDzKhACevjI+ZnE=
 go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
 go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
-golang.org/x/exp v0.0.0-20250718183923-645b1fa84792 h1:R9PFI6EUdfVKgwKjZef7QIwGcBKu86OEFpJ9nUEP2l4=
-golang.org/x/exp v0.0.0-20250718183923-645b1fa84792/go.mod h1:A+z0yzpGtvnG90cToK5n2tu8UJVP2XUATh+r+sfOOOc=
-golang.org/x/net v0.42.0 h1:jzkYrhi3YQWD6MLBJcsklgQsoAcw89EcZbJw8Z614hs=
-golang.org/x/net v0.42.0/go.mod h1:FF1RA5d3u7nAYA4z2TkclSCKh68eSXtiFwcWQpPXdt8=
+golang.org/x/exp v0.0.0-20250813145105-42675adae3e6 h1:SbTAbRFnd5kjQXbczszQ0hdk3ctwYf3qBNH9jIsGclE=
+golang.org/x/exp v0.0.0-20250813145105-42675adae3e6/go.mod h1:4QTo5u+SEIbbKW1RacMZq1YEfOBqeXa19JeshGi+zc4=
+golang.org/x/net v0.43.0 h1:lat02VYK2j4aLzMzecihNvTlJNQUq316m2Mr9rnM6YE=
+golang.org/x/net v0.43.0/go.mod h1:vhO1fvI4dGsIjh73sWfUVjj3N7CA9WkKJNQm2svM6Jg=
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.34.0 h1:H5Y5sJ2L2JRdyv7ROF1he/lPdvFsd0mJHFw2ThKHxLA=
-golang.org/x/sys v0.34.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
-golang.org/x/text v0.27.0 h1:4fGWRpyh641NLlecmyl4LOe6yDdfaYNrGb2zdfo4JV4=
-golang.org/x/text v0.27.0/go.mod h1:1D28KMCvyooCX9hBiosv5Tz/+YLxj0j7XhWjpSUF7CU=
-google.golang.org/genproto/googleapis/api v0.0.0-20250728155136-f173205681a0 h1:0UOBWO4dC+e51ui0NFKSPbkHHiQ4TmrEfEZMLDyRmY8=
-google.golang.org/genproto/googleapis/api v0.0.0-20250728155136-f173205681a0/go.mod h1:8ytArBbtOy2xfht+y2fqKd5DRDJRUQhqbyEnQ4bDChs=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20250728155136-f173205681a0 h1:MAKi5q709QWfnkkpNQ0M12hYJ1+e8qYVDyowc4U1XZM=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20250728155136-f173205681a0/go.mod h1:qQ0YXyHHx3XkvlzUtpXDkS29lDSafHMZBAZDc03LQ3A=
+golang.org/x/sys v0.35.0 h1:vz1N37gP5bs89s7He8XuIYXpyY0+QlsKmzipCbUtyxI=
+golang.org/x/sys v0.35.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
+golang.org/x/text v0.28.0 h1:rhazDwis8INMIwQ4tpjLDzUhx6RlXqZNPEM0huQojng=
+golang.org/x/text v0.28.0/go.mod h1:U8nCwOR8jO/marOQ0QbDiOngZVEBB7MAiitBuMjXiNU=
+google.golang.org/genproto/googleapis/api v0.0.0-20250811230008-5f3141c8851a h1:DMCgtIAIQGZqJXMVzJF4MV8BlWoJh2ZuFiRdAleyr58=
+google.golang.org/genproto/googleapis/api v0.0.0-20250811230008-5f3141c8851a/go.mod h1:y2yVLIE/CSMCPXaHnSKXxu1spLPnglFLegmgdY23uuE=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20250811230008-5f3141c8851a h1:tPE/Kp+x9dMSwUm/uM0JKK0IfdiJkwAbSMSeZBXXJXc=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20250811230008-5f3141c8851a/go.mod h1:gw1tLEfykwDz2ET4a12jcXt4couGAm7IwsVaTy0Sflo=
 google.golang.org/grpc v1.74.2 h1:WoosgB65DlWVC9FqI82dGsZhWFNBSLjQ84bjROOpMu4=
 google.golang.org/grpc v1.74.2/go.mod h1:CtQ+BGjaAIXHs/5YS3i473GqwBBa1zGQNevxdeBEXrM=
-google.golang.org/protobuf v1.36.6 h1:z1NpPI8ku2WgiWnf+t9wTPsn6eP1L7ksHUlkfLvd9xY=
-google.golang.org/protobuf v1.36.6/go.mod h1:jduwjTPXsFjZGTmRluh+L6NjiWu7pchiJ2/5YcXBHnY=
+google.golang.org/protobuf v1.36.7 h1:IgrO7UwFQGJdRNXH/sQux4R1Dj1WAKcLElzeeRaXV2A=
+google.golang.org/protobuf v1.36.7/go.mod h1:jduwjTPXsFjZGTmRluh+L6NjiWu7pchiJ2/5YcXBHnY=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=

pkg/app/app_types.go

@@ -1,3 +1,5 @@
+// Package app provides methods to configure, run, and stop
+// a go-app.
 package app
 
 import (
@@ -11,6 +13,8 @@ import (
 	httpopts "gitea.libretechconsulting.com/rmcguire/go-app/pkg/srv/http/opts"
 )
 
+// App is the main application struct, holding its context, configurations,
+// and various services like HTTP and gRPC.
 type App struct {
 	AppContext    context.Context
 	HTTP          *httpopts.AppHTTP

pkg/app/init.go

@@ -62,7 +62,12 @@ func (a *App) initHTTP(ctx context.Context) error {
 	return err
 }
 
-func (a *App) initOTEL() {
+func (a *App) InitOTEL() {
+	if a.tracer != nil {
+		a.l.Debug().Msg("superfluous call of already configured app otel")
+		return
+	}
+
 	var otelShutdown shutdownFunc
 	a.AppContext, otelShutdown = otel.Init(a.AppContext)
 	a.shutdownFuncs = append(a.shutdownFuncs, otelShutdown)

pkg/app/monitor.go

@@ -27,7 +27,7 @@ func (a *App) monitor() {
 	a.appDone <- nil // Notify app
 }
 
-// Typically invoked when AppContext is done
+// Shutdown is typically invoked when AppContext is done
 // or Server has exited. Not intended to be called
 // manually
 func (a *App) Shutdown() {

pkg/app/run.go

@@ -35,7 +35,7 @@ func (a *App) MustRun() {
 
 	// Start OTEL
 	// Registers a NO-OP provider if not enabled
-	a.initOTEL()
+	a.InitOTEL()
 
 	// With OTEL ready, create an init span to track startup
 	ctx, initSpan := a.tracer.Start(a.AppContext, "init")

pkg/app/schema.go

@@ -6,11 +6,11 @@ import (
 	js "github.com/swaggest/jsonschema-go"
 )
 
-// Generates json schema for app's config.AppConfig
-func (app *App) Schema() ([]byte, error) {
+// Schema generates json schema for app's config.AppConfig
+func (a *App) Schema() ([]byte, error) {
 	r := js.Reflector{}
 
-	s, err := r.Reflect(*app.cfg)
+	s, err := r.Reflect(*a.cfg)
 	if err != nil {
 		return nil, err
 	}
@@ -18,7 +18,7 @@ func (app *App) Schema() ([]byte, error) {
 	return json.MarshalIndent(s, "", "  ")
 }
 
-// Generates json schema for custom config
+// CustomSchema generates json schema for custom config
 // which embeds *config.AppConfig into it
 // Panics if no *config.AppConfig is embedded into custom
 // config type

pkg/app/setup.go

@@ -9,7 +9,7 @@ import (
 	"gitea.libretechconsulting.com/rmcguire/go-app/pkg/logging"
 )
 
-// Helper function to return a context loaded up with
+// MustSetupConfigAndLogging is a helper function to return a context loaded up with
 // config.AppConfig and a logger
 func MustSetupConfigAndLogging(ctx context.Context) context.Context {
 	ctx, err := config.LoadConfig(ctx)
@@ -24,7 +24,7 @@ func MustSetupConfigAndLogging(ctx context.Context) context.Context {
 	return ctx
 }
 
-// Unmarshal config into a custom type
+// MustSetupConfigAndLoggingInto will unmarshal config into a custom type
 // Type MUST include *config.AppConfig
 // Stored in context as *config.AppConfig but can be asserted back
 func MustSetupConfigAndLoggingInto[T any](ctx context.Context, into T) (context.Context, T) {

pkg/app/setup_custom.go

@@ -13,7 +13,7 @@ import (
 	"gitea.libretechconsulting.com/rmcguire/go-app/pkg/config"
 )
 
-// Used to unmarshal config and environment into a custom type
+// MustLoadConfigInto is used to unmarshal config and environment into a custom type
 // that overloads *config.AppConfig. Will perform normal env
 // substitutions for AppConfig, but env overrides for custom type
 // are up to the caller.

pkg/config/config.go

@@ -10,6 +10,7 @@ import (
 	"flag"
 	"fmt"
 	"os"
+	"regexp"
 	"runtime/debug"
 	"time"
 
@@ -17,15 +18,15 @@ import (
 	"gopkg.in/yaml.v3"
 )
 
-// To be set by ldflags in go build command or
-// retrieved from build meta below
+// Version is to be set by ldflags in go build command or
+// retrieved from build meta below.
 var Version = "(devel)"
 
-// Calling this will try to load from config if -config is
+// LoadConfig will try to load from config if -config is
 // provided as a file, and will apply any environment overrides
 // on-top of configuration defaults.
 // Config is stored in returned context, and can be retrieved
-// using config.FromCtx(ctx)
+// using config.FromCtx(ctx).
 func LoadConfig(ctx context.Context) (context.Context, error) {
 	configPath := flag.String("config", "", "Path to the configuration file")
 	flag.Parse()
@@ -44,6 +45,8 @@ func LoadConfig(ctx context.Context) (context.Context, error) {
 	return ctx, nil
 }
 
+// loadConfig loads the application configuration from the specified path,
+// applying environment variable overrides.
 func loadConfig(configPath string) (*AppConfig, error) {
 	cfg := *DefaultConfig
 
@@ -73,6 +76,8 @@ func loadConfig(configPath string) (*AppConfig, error) {
 	return &cfg, nil
 }
 
+// prepareConfig enriches and validates the AppConfig, parsing duration strings
+// for HTTP timeouts.
 func prepareConfig(cfg *AppConfig) error {
 	var errs error
 
@@ -101,15 +106,23 @@ func prepareConfig(cfg *AppConfig) error {
 		}
 	}
 
+	// Prepare user-provided expressions, panic up-front if invalid
+	cfg.HTTP.excludeRegexps = make([]*regexp.Regexp, len(cfg.HTTP.LogExcludePathRegexps))
+	for i, re := range cfg.HTTP.LogExcludePathRegexps {
+		cfg.HTTP.excludeRegexps[i] = regexp.MustCompile(re)
+	}
+
 	return errs
 }
 
-// Returns read timeout, write timeout, and idle timeout, in that order
-// nil if unset
+// Timeouts returns read timeout, write timeout, and idle timeout, in that order.
+// Returns nil if unset.
 func (h *HTTPConfig) Timeouts() (*time.Duration, *time.Duration, *time.Duration) {
 	return h.rT, h.wT, h.iT
 }
 
+// getVersion returns the application version, preferring the build info version
+// over the compile-time set Version variable.
 func getVersion() string {
 	if info, ok := debug.ReadBuildInfo(); ok && info.Main.Version != "(devel)" {
 		return info.Main.Version

pkg/config/ctx.go

@@ -9,10 +9,12 @@ type appConfigKey uint8
 
 const appConfigCtxKey appConfigKey = iota
 
-func (a *AppConfig) AddToCtx(ctx context.Context) context.Context {
-	return context.WithValue(ctx, appConfigCtxKey, a)
+// AddToCtx adds the AppConfig to the provided context.
+func (ac *AppConfig) AddToCtx(ctx context.Context) context.Context {
+	return context.WithValue(ctx, appConfigCtxKey, ac)
 }
 
+// MustFromCtx retrieves the AppConfig from the context, or panics if not found.
 func MustFromCtx(ctx context.Context) *AppConfig {
 	cfg, err := FromCtx(ctx)
 	if err != nil {
@@ -21,6 +23,7 @@ func MustFromCtx(ctx context.Context) *AppConfig {
 	return cfg
 }
 
+// FromCtx retrieves the AppConfig from the context.
 func FromCtx(ctx context.Context) (*AppConfig, error) {
 	ctxData := ctx.Value(appConfigCtxKey)
 	if ctxData == nil {

pkg/config/types.go

@@ -1,6 +1,6 @@
 package config
 
-// Default Settings
+// DefaultConfig provides a default application configuration.
 var DefaultConfig = &AppConfig{
 	Environment: "development",
 	Version:     getVersion(),
@@ -23,6 +23,7 @@ type AppConfig struct {
 	GRPC    *GRPCConfig `yaml:"grpc,omitempty" json:"grpc,omitempty"`
 }
 
+// HTTPEnabled returns true if HTTP is enabled in the AppConfig.
 func (ac *AppConfig) HTTPEnabled() bool {
 	if ac.HTTP != nil && ac.HTTP.Enabled {
 		return true
@@ -30,6 +31,7 @@ func (ac *AppConfig) HTTPEnabled() bool {
 	return false
 }
 
+// GRPCEnabled returns true if gRPC is enabled in the AppConfig.
 func (ac *AppConfig) GRPCEnabled() bool {
 	if ac.GRPC != nil && ac.GRPC.Enabled {
 		return true
@@ -37,6 +39,7 @@ func (ac *AppConfig) GRPCEnabled() bool {
 	return false
 }
 
+// OTELEnabled returns true if OpenTelemetry is enabled in the AppConfig.
 func (ac *AppConfig) OTELEnabled() bool {
 	if ac.OTEL != nil && ac.OTEL.Enabled {
 		return true

pkg/config/types_http.go

@@ -1,6 +1,10 @@
 package config
 
-import "time"
+import (
+	"regexp"
+	"sync"
+	"time"
+)
 
 var defaultHTTPConfig = &HTTPConfig{
 	Enabled: true,
@@ -12,15 +16,25 @@ var defaultHTTPConfig = &HTTPConfig{
 	IdleTimeout:  "1m",
 }
 
-// HTTP Configuration
+// HTTPConfig provides HTTP server Configuration
 type HTTPConfig struct {
 	Enabled               bool     `yaml:"enabled" env:"APP_HTTP_ENABLED" json:"enabled,omitempty"`
 	Listen                string   `yaml:"listen,omitempty" env:"APP_HTTP_LISTEN" json:"listen,omitempty"`
 	LogRequests           bool     `yaml:"logRequests" env:"APP_HTTP_LOG_REQUESTS" json:"logRequests,omitempty"`
+	LogExcludePathRegexps []string `yaml:"logExcludePathRegexps" env:"APP_HTTP_LOG_EXCLUDE_PATH_REGEXPS" json:"logExcludePathRegexps,omitempty"`
 	ReadTimeout           string   `yaml:"readTimeout" env:"APP_HTTP_READ_TIMEOUT" json:"readTimeout,omitempty"`    // Go duration (e.g. 10s)
 	WriteTimeout          string   `yaml:"writeTimeout" env:"APP_HTTP_WRITE_TIMEOUT" json:"writeTimeout,omitempty"` // Go duration (e.g. 10s)
 	IdleTimeout           string   `yaml:"idleTimeout" env:"APP_HTTP_IDLE_TIMEOUT" json:"idleTimeout,omitempty"`    // Go duration (e.g. 10s)
+	excludeRegexps        []*regexp.Regexp
 	rT                    *time.Duration
 	wT                    *time.Duration
 	iT                    *time.Duration
+	lock                  sync.RWMutex
+}
+
+func (h *HTTPConfig) GetExcludeRegexps() []*regexp.Regexp {
+	h.lock.RLock()
+	defer h.lock.RUnlock()
+
+	return h.excludeRegexps
 }

pkg/config/types_logging.go

@@ -8,7 +8,7 @@ var defaultLoggingConfig = &LogConfig{
 	TimeFormat: TimeFormatLong,
 }
 
-// Logging Configuration
+// LogConfig provides Logging Configuration
 type LogConfig struct {
 	Enabled    bool       `yaml:"enabled,omitempty" env:"APP_LOG_ENABLED" json:"enabled,omitempty"`
 	Level      string     `yaml:"level,omitempty" env:"APP_LOG_LEVEL" json:"level,omitempty"`

pkg/config/types_otel.go

@@ -8,7 +8,7 @@ var defaultOTELConfig = &OTELConfig{
 	MetricIntervalSecs: 30,
 }
 
-// OTEL Configuration
+// OtelConfig provides OTEL Configuration
 type OTELConfig struct {
 	Enabled            bool   `yaml:"enabled,omitempty" env:"APP_OTEL_ENABLED" json:"enabled,omitempty"`
 	PrometheusEnabled  bool   `yaml:"prometheusEnabled,omitempty" env:"APP_OTEL_PROMETHEUS_ENABLED" json:"prometheusEnabled,omitempty"`

pkg/logging/logging.go

@@ -1,3 +1,5 @@
+// Package logging provides a centralized logging utility using zerolog,
+// with configurable output formats and log levels.
 package logging
 
 import (

pkg/otel/otel.go

@@ -1,3 +1,4 @@
+// Package otel provides OpenTelemetry initialization and configuration for tracing and metrics.
 package otel
 
 import (
@@ -39,6 +40,7 @@ var (
 
 const defMetricInterval = 15 * time.Second
 
+// Init prepares otel, loading a tracer and meter stored in appp context.
 // Context must carry config.AppConfig
 func Init(ctx context.Context) (context.Context, func(context.Context) error) {
 	cfg := config.MustFromCtx(ctx)
@@ -232,7 +234,7 @@ func (s *settings) newMeterProvider(ctx context.Context) (*metric.MeterProvider,
 	return meterProvider, nil
 }
 
-// Creates a new tracer from the global opentelemetry provider
+// NewTracer creates a new tracer from the global opentelemetry provider
 func NewTracer(options ...trace.TracerOption) trace.Tracer {
 	return opentelemetry.GetTracerProvider().Tracer(
 		os.Getenv("OTEL_SERVICE_NAME"),

pkg/srv/grpc/grpc.go

@@ -1,3 +1,5 @@
+// Package grpc provides a gRPC server implementation with OpenTelemetry integration
+// and gRPC Gateway for RESTful API exposure.
 package grpc
 
 import (
@@ -29,8 +31,9 @@ type appGRPCServer struct {
 	doneChan     chan error
 }
 
-// Returns a shutdown func, a channel indicating done / error,
-// and an up-front error if server fails to start
+// InitGRPCServer initializes and starts a gRPC server.
+// It returns a shutdown function, a channel to signal completion or error,
+// and an error if the server fails to start.
 func InitGRPCServer(ctx context.Context, opts *opts.GRPCOpts) (
 	func(context.Context) error, <-chan error, error,
 ) {

pkg/srv/grpc/logger.go

@@ -8,19 +8,19 @@ import (
 	"github.com/rs/zerolog/log"
 )
 
-// A grpc logging middleware compatible logger
+// GRPCLogger is a grpc logging middleware compatible logger
 // implementation using a zerolog logger, either from
-// the global logger or a context logger
+// the global logger or a context logger.
 type GRPCLogger struct {
 	logger zerolog.Logger
 }
 
-// Returns a grpcLogger using the global zerolog Logger
+// NewGRPCLogger returns a grpcLogger using the global zerolog Logger.
 func NewGRPCLogger() *GRPCLogger {
 	return &GRPCLogger{logger: log.Logger}
 }
 
-// Returns a grpcLogger using the zerolog logger in the provided context
+// NewGRPCContextLogger returns a grpcLogger using the zerolog logger in the provided context.
 func NewGRPCContextLogger(ctx context.Context) *GRPCLogger {
 	logger := log.Ctx(ctx)
 	return &GRPCLogger{logger: *logger}

pkg/srv/http/http.go

@@ -1,3 +1,6 @@
+// Package http provides functionality for setting up and managing HTTP servers.
+// It includes features for health checks, Prometheus metrics, OpenTelemetry
+// tracing, and custom middleware integration.
 package http
 
 import (
@@ -7,6 +10,7 @@ import (
 	"net"
 	"net/http"
 	"os"
+	"regexp"
 	"strings"
 	"time"
 
@@ -24,6 +28,7 @@ import (
 var (
 	httpMeter                   metric.Meter
 	httpTracer                  trace.Tracer
+	httpPatternWithMethodRegexp = regexp.MustCompile(`(\w+) .*`)
 	defReadTimeout              = 10 * time.Second
 	defWriteTimeout             = 10 * time.Second
 	defIdleTimeout              = 15 * time.Second
@@ -36,19 +41,12 @@ func prepHTTPServer(opts *opts.AppHTTP) *http.Server {
 		mux = &http.ServeMux{}
 	)
 
-	// NOTE: Wraps handle func with otelhttp handler and
-	// inserts route tag
-	otelHandleFunc := func(pattern string, handlerFunc func(http.ResponseWriter, *http.Request)) {
-		handler := otelhttp.WithRouteTag(pattern, http.HandlerFunc(handlerFunc))
-		mux.Handle(pattern, handler) // Associate pattern with handler
-	}
-
 	healthChecks := handleHealthCheckFunc(opts.Ctx, opts.HealthChecks...)
-	otelHandleFunc("/health", healthChecks)
-	otelHandleFunc("/", healthChecks)
+	mux.HandleFunc("/health", healthChecks)
+	mux.HandleFunc("/", healthChecks)
 
 	for _, f := range opts.Funcs {
-		otelHandleFunc(f.Path, f.HandlerFunc)
+		mux.HandleFunc(f.Path, f.HandlerFunc)
 	}
 
 	// Prometheus metrics endpoint
@@ -71,12 +69,12 @@ func prepHTTPServer(opts *opts.AppHTTP) *http.Server {
 		if h.StripPrefix {
 			h.Handler = http.StripPrefix(h.Prefix[:len(h.Prefix)-1], h.Handler)
 		}
-		mux.Handle(h.Prefix, h.Handler)
+		mux.Handle(h.Prefix, otelhttp.WithRouteTag(h.Prefix, h.Handler))
 	}
 
-	// Add OTEL, skip health-check spans
-	// NOTE: Add any other span exclusions here
+	// Add OTEL instrumentation, filter noise, set span names
 	handler := otelhttp.NewHandler(mux, "/",
+		// TODO: Make configurable similar to config.http.LogExcludePathRegexps
 		otelhttp.WithFilter(func(r *http.Request) bool {
 			switch r.URL.Path {
 			case "/health":
@@ -86,6 +84,18 @@ func prepHTTPServer(opts *opts.AppHTTP) *http.Server {
 			default:
 				return true
 			}
+		}),
+		otelhttp.WithSpanNameFormatter(func(operation string, r *http.Request) string {
+			endpoint := r.URL.Path
+			if _, pattern := mux.Handler(r); pattern != "" {
+				endpoint = pattern
+			}
+
+			if httpPatternWithMethodRegexp.MatchString(endpoint) {
+				return endpoint
+			}
+
+			return fmt.Sprintf("%s %s", r.Method, endpoint)
 		}))
 
 	// Set timeouts from defaults, override
@@ -133,8 +143,8 @@ func prepHTTPServer(opts *opts.AppHTTP) *http.Server {
 	}
 }
 
-// Returns a shutdown func and a done channel if the
-// server aborts abnormally. Returns error on failure to start
+// InitHTTPServer returns a shutdown func and a done channel if the
+// server aborts abnormally. Returns error on failure to start.
 func InitHTTPServer(opts *opts.AppHTTP) (
 	func(context.Context) error, <-chan any, error,
 ) {

pkg/srv/http/http_log.go

@@ -3,12 +3,15 @@ package http
 import (
 	"bytes"
 	"context"
-	"errors"
+	"fmt"
+	"io"
 	"net/http"
 	"regexp"
 	"time"
 
 	"github.com/rs/zerolog"
+
+	"gitea.libretechconsulting.com/rmcguire/go-app/pkg/config"
 )
 
 var ExcludeFromLogging = regexp.MustCompile(`\/(ready|live|metrics)$`)
@@ -20,12 +23,22 @@ type LoggingResponseWriter struct {
 }
 
 func loggingMiddleware(appCtx context.Context, next http.Handler) http.Handler {
+	appConfig := config.MustFromCtx(appCtx)
+
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		if ExcludeFromLogging.Match([]byte(r.URL.Path)) {
 			next.ServeHTTP(w, r)
 			return
 		}
 
+		// User-configurable logging exclusions
+		for _, re := range appConfig.HTTP.GetExcludeRegexps() {
+			if re.MatchString(r.URL.Path) {
+				next.ServeHTTP(w, r)
+				return
+			}
+		}
+
 		log := zerolog.Ctx(appCtx)
 
 		start := time.Now()
@@ -41,29 +54,42 @@ func loggingMiddleware(appCtx context.Context, next http.Handler) http.Handler {
 			Dur("duration", time.Since(start)).
 			Msg("http request served")
 
-		// Log response body
+			// Log response with body if not 204
+		if lrr.statusCode == http.StatusNoContent {
+			trcLog := log.Trace().
+				Str("path", r.URL.Path).
+				Int("statusCode", lrr.statusCode)
+			trcLog.Msg("http response (no content)") // Explicitly log 204
+			return                                   // No body to log for 204 No Content
+		}
+
 		trcLog := log.Trace().
 			Str("path", r.URL.Path).
 			Int("statusCode", lrr.statusCode)
 
-		// Check if it's JSON
 		firstByte, err := lrr.body.ReadByte()
 		if err != nil {
-			trcLog.Err(errors.New("invalid response body")).Send()
-			return
+			if err == io.EOF {
+				// Body is empty, which might be valid for some non-204 responses.
+				trcLog.Msg("http response (empty body)")
+			} else {
+				// Other error reading the body. Wrap the original error for context.
+				trcLog.Err(fmt.Errorf("error reading response body: %w", err)).Send()
 			}
-		lrr.body.UnreadByte()
+			return // No further body processing if there was an error or it was empty
+		}
+		lrr.body.UnreadByte() // Put the byte back for Bytes() to read
 
 		if firstByte == '{' {
 			trcLog = trcLog.RawJSON("response", lrr.body.Bytes())
 		} else {
 			trcLog = trcLog.Bytes("response", lrr.body.Bytes())
 		}
-		trcLog.Msg("response payload")
+		trcLog.Msg("http response")
 	})
 }
 
-// Implement Flush to support the http.Flusher interface
+// Flush implements the http.Flusher interface to allow flushing buffered data.
 func (w *LoggingResponseWriter) Flush() {
 	if flusher, ok := w.ResponseWriter.(http.Flusher); ok {
 		flusher.Flush()