hf: add checkout to container image workflow

Reviewed-on: #2

.air.toml

@@ -0,0 +1,80 @@
+# .air.toml
+#
+# A configuration file for the 'air' live-reloading tool.
+# This configuration is tailored for a Go project that needs to be run with specific command-line flags
+# and requires graceful handling of system signals like SIGINT and SIGTERM.
+#
+# To use:
+# 1. Install air: `go install github.com/cosmtrek/air@latest`
+# 2. Place this file, renamed to `.air.toml`, in the root of your project.
+# 3. Run `air` from your terminal in the project root.
+
+# The root directory of your project to watch for changes.
+# '.' indicates the current directory where air is run.
+root = "."
+
+# A temporary directory for air to store its build artifacts.
+# You should add this directory to your .gitignore file.
+tmp_dir = "tmp"
+
+[build]
+# Step 1: Build the Go binary and place it in the tmp directory.
+# Step 2: Copy the configuration file into the tmp directory as well.
+# This ensures all runtime assets are in one place.
+cmd = "go build -o ./tmp/main . && cp config.yaml ./tmp/"
+
+# The 'full_bin' command gives us complete control over how the app is run.
+# We first change the directory to 'tmp' so that the application's working
+# directory is where the binary and its config file are located.
+# Then, we execute the binary, pointing it to the config file in the same directory.
+full_bin = "cd ./tmp && ./main -config config.yaml"
+
+# A list of directories to watch for file changes.
+# Air will recursively watch these directories.
+include_dir = ["."]
+
+# A list of file extensions to watch.
+# Air will restart when any of these files change.
+include_ext = ["go", "toml", "yaml", "yml"]
+
+# A list of directories to ignore.
+# It's good practice to ignore temporary directories, vendor folders, and git history.
+exclude_dir = ["tmp", "vendor", ".git"]
+
+# A list of specific files to ignore.
+exclude_file = []
+
+# A list of regular expressions to exclude files or directories.
+exclude_regex = ["_test.go"]
+
+# A list of files or directories to watch that are not in the 'include_dir'.
+# Useful for watching template files if they are outside your main source directories.
+include_file = []
+
+# This setting is crucial for graceful shutdowns.
+# It stops the running process on a file change before building and restarting.
+# This ensures that your application's shutdown logic is triggered.
+stop_on_error = true
+
+# Send SIGINT (Ctrl+C) to the running process before killing it.
+# This is essential for allowing your application to handle the signal and shut down gracefully.
+send_interrupt = true
+
+# The delay in milliseconds to wait for the process to shut down gracefully after sending SIGINT.
+# If your app needs more time for cleanup, you can increase this value.
+kill_delay = 500 # ms
+
+[log]
+# Show timestamps in the log output.
+time = true
+
+[color]
+# Customize colors for different parts of the air output.
+main = "magenta"
+watcher = "cyan"
+build = "yellow"
+runner = "green"
+
+[misc]
+# Delete the temporary binary file on exit.
+clean_on_exit = true

.gitea/workflows/ci.yml

@@ -20,7 +20,7 @@ env:
   CHART_DIR: helm/
 
 jobs:
-  release:
+  go-binaries:
     runs-on: ubuntu-latest
     if: startsWith(github.ref, 'refs/tags/v')  # Only run on tag push
     steps:
@@ -67,6 +67,13 @@ jobs:
             exit 1
           fi
 
+  container-images:
+    runs-on: ubuntu-latest
+    if: startsWith(github.ref, 'refs/tags/v')  # Only run on tag push
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v4
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
@@ -119,6 +126,12 @@ jobs:
         run: |
           curl -fsSL https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3 | bash
 
+      - name: Fetch Dependencies
+        run: |
+          cd ${CHART_DIR} && \
+          helm repo add hull https://vidispine.github.io/hull && \
+          helm dep build
+
       - name: Package Chart
         run: |
           helm package --app-version ${VERSION} ${CHART_DIR}

Makefile

@@ -79,6 +79,9 @@ rename:
 	@sed -i "s|otelServiceName: .*|otelServiceName: $(APP)|g" helm/values.yaml
 	@sed -i "s|app=.*|app=$(APP)|g" helm/values.yaml
 	@sed -i "s|$(CMD_NAME)|$(APP)|g" README.md
+	@sed -i "s|$(CMD_NAME)|$(APP)|g" .gitea/workflows/ci.yml
+	@sed -i "s|$(GIT_REPO)|$(NAME)|g" .gitea/workflows/ci.yml
+	@rm contrib/$(CMD_NAME).swagger.json
 	@find . -type f -a \
 	\( -name '*.go' -o -name 'go.mod' \
 		-o -name 'go.sum' -o -name '*.proto' \
@@ -87,4 +90,6 @@ rename:
 	\) \
 	-not -path './.git' -not -path './.git/*' \
 	-exec sed -i "s|$(GIT_REPO)|$(NAME)|g" {} +
-	@echo "Project renamed to $(NAME)"
+	@echo "\n* Project renamed to $(NAME)"
+	@echo "* NOTE: You will have to update .gitea/workflows/ci.yml"
+	@echo "* NOTE: You will have to run buf generate"

README.md

@@ -10,6 +10,7 @@ Check out the [go-app framework](https://gitea.libretechconsulting.com/rmcguire/
 
 - **📈 OpenTelemetry (OTEL) Metrics & Traces** – Comprehensive observability with built-in support for metrics and traces.
 - 📝 Logging with Zerolog – High-performance structured logging with zerolog for ultra-fast, leveled logging.
+- 💻 Local dev with air pre-configured (just run `air`)
 - **💬 GRPC + GRPC-Gateway** – Supports RESTful JSON APIs alongside gRPC with auto-generated Swagger (OpenAPI2) specs.
 - 🌐 HTTP and GRPC Middleware – Flexible middleware support for HTTP and GRPC to enhance request handling, authentication, and observability.
 - **📦 Multi-Arch Builds** – Robust Makefile that supports building for multiple architectures (amd64, arm64, etc.).

TODO.md

@@ -1,6 +1,8 @@
 # Demo app TODO
 
-- [ ] Update README for tagging/versioning/pipeline info
+- [x] Create generic interface for implenting a service
+- [x] Create config sample not called demo, so it is more easily reused
+- [x] Update README for tagging/versioning/pipeline info
 - [x] Update README for detail on installing protoc tools and make
 - [x] Rename project
 - [x] Finish grpc sample implementation

api/demo/app/v1alpha1/app.pb.go

@@ -7,6 +7,7 @@
 package demo
 
 import (
+	_ "buf.build/gen/go/bufbuild/protovalidate/protocolbuffers/go/buf/validate"
 	_ "google.golang.org/genproto/googleapis/api/annotations"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
@@ -143,15 +144,15 @@ var File_demo_app_v1alpha1_app_proto protoreflect.FileDescriptor
 
 const file_demo_app_v1alpha1_app_proto_rawDesc = "" +
 	"\n" +
-	"\x1bdemo/app/v1alpha1/app.proto\x12\x11demo.app.v1alpha1\x1a\x1cgoogle/api/annotations.proto\x1a\x1fgoogle/protobuf/timestamp.proto\">\n" +
+	"\x1bdemo/app/v1alpha1/app.proto\x12\x11demo.app.v1alpha1\x1a\x1bbuf/validate/validate.proto\x1a\x1cgoogle/api/annotations.proto\x1a\x1fgoogle/protobuf/timestamp.proto\"G\n" +
-	"\x0eGetDemoRequest\x12\x1f\n" +
+	"\x0eGetDemoRequest\x12(\n" +
-	"\blanguage\x18\x01 \x01(\tH\x00R\blanguage\x88\x01\x01B\v\n" +
+	"\blanguage\x18\x01 \x01(\tB\a\xbaH\x04r\x02\x10\x02H\x00R\blanguage\x88\x01\x01B\v\n" +
-	"\t_language\"\x93\x01\n" +
+	"\t_language\"\x9c\x01\n" +
 	"\x0fGetDemoResponse\x128\n" +
 	"\ttimestamp\x18\x01 \x01(\v2\x1a.google.protobuf.TimestampR\ttimestamp\x12\x12\n" +
 	"\x04fact\x18\x02 \x01(\tR\x04fact\x12\x16\n" +
-	"\x06source\x18\x03 \x01(\tR\x06source\x12\x1a\n" +
+	"\x06source\x18\x03 \x01(\tR\x06source\x12#\n" +
-	"\blanguage\x18\x04 \x01(\tR\blanguage2z\n" +
+	"\blanguage\x18\x04 \x01(\tB\a\xbaH\x04r\x02\x10\x02R\blanguage2z\n" +
 	"\x0eDemoAppService\x12h\n" +
 	"\aGetDemo\x12!.demo.app.v1alpha1.GetDemoRequest\x1a\".demo.app.v1alpha1.GetDemoResponse\"\x16\x82\xd3\xe4\x93\x02\x10\x12\x0e/v1alpha1/demoB\xd5\x01\n" +
 	"\x15com.demo.app.v1alpha1B\bAppProtoP\x01ZLgitea.libretechconsulting.com/rmcguire/go-server-with-otel/api/v1alpha1/demo\xa2\x02\x03DAX\xaa\x02\x11Demo.App.V1alpha1\xca\x02\x11Demo\\App\\V1alpha1\xe2\x02\x1dDemo\\App\\V1alpha1\\GPBMetadata\xea\x02\x13Demo::App::V1alpha1b\x06proto3"

api/demo/app/v1alpha1/app.pb.validate.go

@@ -1,275 +0,0 @@
-// Code generated by protoc-gen-validate. DO NOT EDIT.
-// source: demo/app/v1alpha1/app.proto
-
-package demo
-
-import (
-	"bytes"
-	"errors"
-	"fmt"
-	"net"
-	"net/mail"
-	"net/url"
-	"regexp"
-	"sort"
-	"strings"
-	"time"
-	"unicode/utf8"
-
-	"google.golang.org/protobuf/types/known/anypb"
-)
-
-// ensure the imports are used
-var (
-	_ = bytes.MinRead
-	_ = errors.New("")
-	_ = fmt.Print
-	_ = utf8.UTFMax
-	_ = (*regexp.Regexp)(nil)
-	_ = (*strings.Reader)(nil)
-	_ = net.IPv4len
-	_ = time.Duration(0)
-	_ = (*url.URL)(nil)
-	_ = (*mail.Address)(nil)
-	_ = anypb.Any{}
-	_ = sort.Sort
-)
-
-// Validate checks the field values on GetDemoRequest with the rules defined in
-// the proto definition for this message. If any rules are violated, the first
-// error encountered is returned, or nil if there are no violations.
-func (m *GetDemoRequest) Validate() error {
-	return m.validate(false)
-}
-
-// ValidateAll checks the field values on GetDemoRequest with the rules defined
-// in the proto definition for this message. If any rules are violated, the
-// result is a list of violation errors wrapped in GetDemoRequestMultiError,
-// or nil if none found.
-func (m *GetDemoRequest) ValidateAll() error {
-	return m.validate(true)
-}
-
-func (m *GetDemoRequest) validate(all bool) error {
-	if m == nil {
-		return nil
-	}
-
-	var errors []error
-
-	if m.Language != nil {
-		// no validation rules for Language
-	}
-
-	if len(errors) > 0 {
-		return GetDemoRequestMultiError(errors)
-	}
-
-	return nil
-}
-
-// GetDemoRequestMultiError is an error wrapping multiple validation errors
-// returned by GetDemoRequest.ValidateAll() if the designated constraints
-// aren't met.
-type GetDemoRequestMultiError []error
-
-// Error returns a concatenation of all the error messages it wraps.
-func (m GetDemoRequestMultiError) Error() string {
-	msgs := make([]string, 0, len(m))
-	for _, err := range m {
-		msgs = append(msgs, err.Error())
-	}
-	return strings.Join(msgs, "; ")
-}
-
-// AllErrors returns a list of validation violation errors.
-func (m GetDemoRequestMultiError) AllErrors() []error { return m }
-
-// GetDemoRequestValidationError is the validation error returned by
-// GetDemoRequest.Validate if the designated constraints aren't met.
-type GetDemoRequestValidationError struct {
-	field  string
-	reason string
-	cause  error
-	key    bool
-}
-
-// Field function returns field value.
-func (e GetDemoRequestValidationError) Field() string { return e.field }
-
-// Reason function returns reason value.
-func (e GetDemoRequestValidationError) Reason() string { return e.reason }
-
-// Cause function returns cause value.
-func (e GetDemoRequestValidationError) Cause() error { return e.cause }
-
-// Key function returns key value.
-func (e GetDemoRequestValidationError) Key() bool { return e.key }
-
-// ErrorName returns error name.
-func (e GetDemoRequestValidationError) ErrorName() string { return "GetDemoRequestValidationError" }
-
-// Error satisfies the builtin error interface
-func (e GetDemoRequestValidationError) Error() string {
-	cause := ""
-	if e.cause != nil {
-		cause = fmt.Sprintf(" | caused by: %v", e.cause)
-	}
-
-	key := ""
-	if e.key {
-		key = "key for "
-	}
-
-	return fmt.Sprintf(
-		"invalid %sGetDemoRequest.%s: %s%s",
-		key,
-		e.field,
-		e.reason,
-		cause)
-}
-
-var _ error = GetDemoRequestValidationError{}
-
-var _ interface {
-	Field() string
-	Reason() string
-	Key() bool
-	Cause() error
-	ErrorName() string
-} = GetDemoRequestValidationError{}
-
-// Validate checks the field values on GetDemoResponse with the rules defined
-// in the proto definition for this message. If any rules are violated, the
-// first error encountered is returned, or nil if there are no violations.
-func (m *GetDemoResponse) Validate() error {
-	return m.validate(false)
-}
-
-// ValidateAll checks the field values on GetDemoResponse with the rules
-// defined in the proto definition for this message. If any rules are
-// violated, the result is a list of violation errors wrapped in
-// GetDemoResponseMultiError, or nil if none found.
-func (m *GetDemoResponse) ValidateAll() error {
-	return m.validate(true)
-}
-
-func (m *GetDemoResponse) validate(all bool) error {
-	if m == nil {
-		return nil
-	}
-
-	var errors []error
-
-	if all {
-		switch v := interface{}(m.GetTimestamp()).(type) {
-		case interface{ ValidateAll() error }:
-			if err := v.ValidateAll(); err != nil {
-				errors = append(errors, GetDemoResponseValidationError{
-					field:  "Timestamp",
-					reason: "embedded message failed validation",
-					cause:  err,
-				})
-			}
-		case interface{ Validate() error }:
-			if err := v.Validate(); err != nil {
-				errors = append(errors, GetDemoResponseValidationError{
-					field:  "Timestamp",
-					reason: "embedded message failed validation",
-					cause:  err,
-				})
-			}
-		}
-	} else if v, ok := interface{}(m.GetTimestamp()).(interface{ Validate() error }); ok {
-		if err := v.Validate(); err != nil {
-			return GetDemoResponseValidationError{
-				field:  "Timestamp",
-				reason: "embedded message failed validation",
-				cause:  err,
-			}
-		}
-	}
-
-	// no validation rules for Fact
-
-	// no validation rules for Source
-
-	// no validation rules for Language
-
-	if len(errors) > 0 {
-		return GetDemoResponseMultiError(errors)
-	}
-
-	return nil
-}
-
-// GetDemoResponseMultiError is an error wrapping multiple validation errors
-// returned by GetDemoResponse.ValidateAll() if the designated constraints
-// aren't met.
-type GetDemoResponseMultiError []error
-
-// Error returns a concatenation of all the error messages it wraps.
-func (m GetDemoResponseMultiError) Error() string {
-	msgs := make([]string, 0, len(m))
-	for _, err := range m {
-		msgs = append(msgs, err.Error())
-	}
-	return strings.Join(msgs, "; ")
-}
-
-// AllErrors returns a list of validation violation errors.
-func (m GetDemoResponseMultiError) AllErrors() []error { return m }
-
-// GetDemoResponseValidationError is the validation error returned by
-// GetDemoResponse.Validate if the designated constraints aren't met.
-type GetDemoResponseValidationError struct {
-	field  string
-	reason string
-	cause  error
-	key    bool
-}
-
-// Field function returns field value.
-func (e GetDemoResponseValidationError) Field() string { return e.field }
-
-// Reason function returns reason value.
-func (e GetDemoResponseValidationError) Reason() string { return e.reason }
-
-// Cause function returns cause value.
-func (e GetDemoResponseValidationError) Cause() error { return e.cause }
-
-// Key function returns key value.
-func (e GetDemoResponseValidationError) Key() bool { return e.key }
-
-// ErrorName returns error name.
-func (e GetDemoResponseValidationError) ErrorName() string { return "GetDemoResponseValidationError" }
-
-// Error satisfies the builtin error interface
-func (e GetDemoResponseValidationError) Error() string {
-	cause := ""
-	if e.cause != nil {
-		cause = fmt.Sprintf(" | caused by: %v", e.cause)
-	}
-
-	key := ""
-	if e.key {
-		key = "key for "
-	}
-
-	return fmt.Sprintf(
-		"invalid %sGetDemoResponse.%s: %s%s",
-		key,
-		e.field,
-		e.reason,
-		cause)
-}
-
-var _ error = GetDemoResponseValidationError{}
-
-var _ interface {
-	Field() string
-	Reason() string
-	Key() bool
-	Cause() error
-	ErrorName() string
-} = GetDemoResponseValidationError{}

buf.gen.yaml

@@ -14,10 +14,6 @@ plugins:
     opt:
       - paths=source_relative
       - require_unimplemented_servers=false
-  - remote: buf.build/bufbuild/validate-go
-    out: api
-    opt:
-      - paths=source_relative
   - remote: buf.build/grpc-ecosystem/gateway
     out: api
     opt:

config.yaml

@@ -26,4 +26,5 @@ grpc:
   grpcGatewayPath: /api
   enableGRPCGateway: true
   enableInstrumentation: true
+  enableProtovalidate: true
   logRequests: true

contrib/schema.json

@@ -26,6 +26,11 @@
         "enableInstrumentation": {
           "type": "boolean"
         },
+        "enableProtovalidate": {
+          "description": "Add a chain unary and streaming interceptor for buf.build/go/protovalidate",
+          "default": false,
+          "type": "boolean"
+        },
         "enableReflection": {
           "type": "boolean"
         },

go.mod

@@ -5,13 +5,14 @@ go 1.24.2
 toolchain go1.24.5
 
 require (
-	gitea.libretechconsulting.com/rmcguire/go-app v0.9.4
+	buf.build/gen/go/bufbuild/protovalidate/protocolbuffers/go v1.36.6-20250717185734-6c6e0d3c608e.1
+	gitea.libretechconsulting.com/rmcguire/go-app v0.10.0
 	github.com/go-resty/resty/v2 v2.16.5
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.27.1
 	github.com/rs/zerolog v1.34.0
 	go.opentelemetry.io/otel/trace v1.37.0
 	golang.org/x/sys v0.34.0
-	google.golang.org/genproto/googleapis/api v0.0.0-20250715232539-7130f93afb79
+	google.golang.org/genproto/googleapis/api v0.0.0-20250721164621-a45f3dfb1074
 	google.golang.org/grpc v1.73.0
 	google.golang.org/protobuf v1.36.6
 )
@@ -20,7 +21,6 @@ require (
 	github.com/caarlos0/env/v11 v11.3.1 // indirect
 	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/grpc-ecosystem/go-grpc-middleware/v2 v2.3.2 // indirect
-	github.com/klauspost/compress v1.18.0 // indirect
 	github.com/swaggest/jsonschema-go v0.3.78 // indirect
 	github.com/swaggest/refl v1.4.0 // indirect
 	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.62.0 // indirect
@@ -28,7 +28,7 @@ require (
 	go.opentelemetry.io/otel v1.37.0
 	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v1.37.0 // indirect
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.37.0 // indirect
-	go.opentelemetry.io/otel/exporters/prometheus v0.59.0 // indirect
+	go.opentelemetry.io/otel/exporters/prometheus v0.59.1 // indirect
 	go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v1.37.0 // indirect
 	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.37.0 // indirect
 	go.opentelemetry.io/otel/sdk v1.37.0 // indirect
@@ -37,27 +37,34 @@ require (
 )
 
 require (
+	buf.build/go/protovalidate v0.14.0 // 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
-	github.com/cenkalti/backoff/v4 v4.3.0 // indirect
 	github.com/cenkalti/backoff/v5 v5.0.2 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/go-logr/logr v1.4.3 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/google/cel-go v0.26.0 // indirect
 	github.com/google/uuid v1.6.0 // indirect
+	github.com/grafana/regexp v0.0.0-20240518133315-a468a5bfb3bc // indirect
 	github.com/mattn/go-colorable v0.1.14 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/prometheus/client_golang v1.22.0 // indirect
 	github.com/prometheus/client_model v0.6.2 // indirect
 	github.com/prometheus/common v0.65.0 // indirect
+	github.com/prometheus/otlptranslator v0.0.0-20250717125610-8549f4ab4f8f // indirect
 	github.com/prometheus/procfs v0.17.0 // indirect
+	github.com/stoewer/go-strcase v1.3.1 // indirect
 	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.37.0 // indirect
 	go.opentelemetry.io/otel/metric v1.37.0 // indirect
 	go.opentelemetry.io/proto/otlp v1.7.0 // indirect
+	golang.org/x/exp v0.0.0-20250718183923-645b1fa84792 // indirect
 	golang.org/x/net v0.42.0 // indirect
 	golang.org/x/text v0.27.0 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20250715232539-7130f93afb79 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20250721164621-a45f3dfb1074 // indirect
 	google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.5.1 // indirect
 )
 

go.sum

@@ -1,7 +1,13 @@
-gitea.libretechconsulting.com/rmcguire/go-app v0.9.2 h1:DTbGae0TR7O+kKI1ZE8txgFnGb0vsYX/urFUFuoZfQM=
+buf.build/gen/go/bufbuild/protovalidate/protocolbuffers/go v1.36.6-20250717185734-6c6e0d3c608e.1 h1:Lg6klmCi3v7VvpqeeLEER9/m5S8y9e9DjhqQnSCNy4k=
-gitea.libretechconsulting.com/rmcguire/go-app v0.9.2/go.mod h1:W6YHFSGf4nJrgs9DqEaw+3J6ufIARsr1zpOs/V6gRTQ=
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@@ -33,17 +36,16 @@ github.com/go-resty/resty/v2 v2.16.5/go.mod h1:hkJtXbA2iKHzJheXYvQ8snQES5ZLGKMwQ
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@@ -68,20 +70,14 @@ github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8m
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@@ -91,16 +87,20 @@ github.com/rs/zerolog v1.34.0 h1:k43nTLIwcTVQAncfCw4KZ2VY6ukYoZaBPNOE8txlOeY=
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@@ -109,91 +109,53 @@ github.com/yudai/golcs v0.0.0-20170316035057-ecda9a501e82 h1:BHyfKlQyqbsFN5p3Ifn
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 go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.37.0 h1:Ahq7pZmv87yiyn3jeFz/LekZmPLLdKejuO3NcK9MssM=
 go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.37.0/go.mod h1:MJTqhM0im3mRLw1i8uGHnCvUEeS7VwRyxlLC78PA18M=
-go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.35.0 h1:m639+BofXTvcY1q8CGs4ItwQarYtJPOWmVobfM1HpVI=
-go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.35.0/go.mod h1:LjReUci/F4BUyv+y4dwnq3h/26iNOeC3wAIqgvTIZVo=
 go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.37.0 h1:EtFWSnwW9hGObjkIdmlnWSydO+Qs8OwzfzXLUPg4xOc=
 go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.37.0/go.mod h1:QjUEoiGCPkvFZ/MjK6ZZfNOS6mfVEVKYE99dFhuN2LI=
-go.opentelemetry.io/otel/exporters/prometheus v0.57.0 h1:AHh/lAP1BHrY5gBwk8ncc25FXWm/gmmY3BX258z5nuk=
+go.opentelemetry.io/otel/exporters/prometheus v0.59.1 h1:HcpSkTkJbggT8bjYP+BjyqPWlD17BH9C5CYNKeDzmcA=
-go.opentelemetry.io/otel/exporters/prometheus v0.57.0/go.mod h1:QpFWz1QxqevfjwzYdbMb4Y1NnlJvqSGwyuU0B4iuc9c=
+go.opentelemetry.io/otel/exporters/prometheus v0.59.1/go.mod h1:0FJL+gjuUoM07xzik3KPBaN+nz/CoB15kV6WLMiXZag=
-go.opentelemetry.io/otel/exporters/prometheus v0.59.0 h1:HHf+wKS6o5++XZhS98wvILrLVgHxjA/AMjqHKes+uzo=
-go.opentelemetry.io/otel/exporters/prometheus v0.59.0/go.mod h1:R8GpRXTZrqvXHDEGVH5bF6+JqAZcK8PjJcZ5nGhEWiE=
-go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v1.35.0 h1:PB3Zrjs1sG1GBX51SXyTSoOTqcDglmsk7nT6tkKPb/k=
-go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v1.35.0/go.mod h1:U2R3XyVPzn0WX7wOIypPuptulsMcPDPs/oiSVOMVnHY=
 go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v1.37.0 h1:6VjV6Et+1Hd2iLZEPtdV7vie80Yyqf7oikJLjQ/myi0=
 go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v1.37.0/go.mod h1:u8hcp8ji5gaM/RfcOo8z9NMnf1pVLfVY7lBY2VOGuUU=
-go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.35.0 h1:T0Ec2E+3YZf5bgTNQVet8iTDW7oIk03tXHq+wkwIDnE=
-go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.35.0/go.mod h1:30v2gqH+vYGJsesLWFov8u47EpYTcIQcBjKpI6pJThg=
 go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.37.0 h1:SNhVp/9q4Go/XHBkQ1/d5u9P/U+L1yaGPoi0x+mStaI=
 go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.37.0/go.mod h1:tx8OOlGH6R4kLV67YaYO44GFXloEjGPZuMjEkaaqIp4=
-go.opentelemetry.io/otel/metric v1.35.0 h1:0znxYu2SNyuMSQT4Y9WDWej0VpcsxkuklLa4/siN90M=
-go.opentelemetry.io/otel/metric v1.35.0/go.mod h1:nKVFgxBZ2fReX6IlyW28MgZojkoAkJGaE8CpgeAU3oE=
 go.opentelemetry.io/otel/metric v1.37.0 h1:mvwbQS5m0tbmqML4NqK+e3aDiO02vsf/WgbsdpcPoZE=
 go.opentelemetry.io/otel/metric v1.37.0/go.mod h1:04wGrZurHYKOc+RKeye86GwKiTb9FKm1WHtO+4EVr2E=
-go.opentelemetry.io/otel/sdk v1.35.0 h1:iPctf8iprVySXSKJffSS79eOjl9pvxV9ZqOWT0QejKY=
-go.opentelemetry.io/otel/sdk v1.35.0/go.mod h1:+ga1bZliga3DxJ3CQGg3updiaAJoNECOgJREo9KHGQg=
 go.opentelemetry.io/otel/sdk v1.37.0 h1:ItB0QUqnjesGRvNcmAcU0LyvkVyGJ2xftD29bWdDvKI=
 go.opentelemetry.io/otel/sdk v1.37.0/go.mod h1:VredYzxUvuo2q3WRcDnKDjbdvmO0sCzOvVAiY+yUkAg=
-go.opentelemetry.io/otel/sdk/metric v1.35.0 h1:1RriWBmCKgkeHEhM7a2uMjMUfP7MsOF5JpUCaEqEI9o=
-go.opentelemetry.io/otel/sdk/metric v1.35.0/go.mod h1:is6XYCUMpcKi+ZsOvfluY5YstFnhW0BidkR+gL+qN+w=
 go.opentelemetry.io/otel/sdk/metric v1.37.0 h1:90lI228XrB9jCMuSdA0673aubgRobVZFhbjxHHspCPc=
 go.opentelemetry.io/otel/sdk/metric v1.37.0/go.mod h1:cNen4ZWfiD37l5NhS+Keb5RXVWZWpRE+9WyVCpbo5ps=
-go.opentelemetry.io/otel/trace v1.35.0 h1:dPpEfJu1sDIqruz7BHFG3c7528f6ddfSWfFDVt/xgMs=
-go.opentelemetry.io/otel/trace v1.35.0/go.mod h1:WUk7DtFp1Aw2MkvqGdwiXYDZZNvA/1J8o6xRXLrIkyc=
 go.opentelemetry.io/otel/trace v1.37.0 h1:HLdcFNbRQBE2imdSEgm/kwqmQj1Or1l/7bW6mxVK7z4=
 go.opentelemetry.io/otel/trace v1.37.0/go.mod h1:TlgrlQ+PtQO5XFerSPUYG0JSgGyryXewPGyayAWSBS0=
-go.opentelemetry.io/proto/otlp v1.5.0 h1:xJvq7gMzB31/d406fB8U5CBdyQGw4P399D1aQWU/3i4=
-go.opentelemetry.io/proto/otlp v1.5.0/go.mod h1:keN8WnHxOy8PG0rQZjJJ5A2ebUoafqWp0eVQ4yIXvJ4=
 go.opentelemetry.io/proto/otlp v1.7.0 h1:jX1VolD6nHuFzOYso2E73H85i92Mv8JQYk0K9vz09os=
 go.opentelemetry.io/proto/otlp v1.7.0/go.mod h1:fSKjH6YJ7HDlwzltzyMj036AJ3ejJLCgCSHGj4efDDo=
 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/net v0.38.0 h1:vRMAPTMaeGqVhG5QyLJHqNDwecKTomGeqbnfZyKlBI8=
+golang.org/x/exp v0.0.0-20250718183923-645b1fa84792 h1:R9PFI6EUdfVKgwKjZef7QIwGcBKu86OEFpJ9nUEP2l4=
-golang.org/x/net v0.38.0/go.mod h1:ivrbrMbzFq5J41QOQh0siUuly180yBYtLp+CKbEaFx8=
+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/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 v0.31.0 h1:ioabZlmFYtWhL+TRYpcnNlLwhyxaM9kWTDEmfnprqik=
-golang.org/x/sys v0.31.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
 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 v0.23.0 h1:D71I7dUrlY+VX0gQShAThNGHFxZ13dGLBHQLVl1mJlY=
-golang.org/x/text v0.23.0/go.mod h1:/BLNzu4aZCJ1+kcD0DNRotWKage4q2rGVAg4o22unh4=
 golang.org/x/text v0.27.0 h1:4fGWRpyh641NLlecmyl4LOe6yDdfaYNrGb2zdfo4JV4=
 golang.org/x/text v0.27.0/go.mod h1:1D28KMCvyooCX9hBiosv5Tz/+YLxj0j7XhWjpSUF7CU=
 golang.org/x/time v0.6.0 h1:eTDhh4ZXt5Qf0augr54TN6suAUudPcawVZeIAPU7D4U=
 golang.org/x/time v0.6.0/go.mod h1:3BpzKBy/shNhVucY/MWOyx10tF3SFh9QdLuxbVysPQM=
-google.golang.org/genproto/googleapis/api v0.0.0-20250324211829-b45e905df463 h1:hE3bRWtU6uceqlh4fhrSnUyjKHMKB9KrTLLG+bc0ddM=
+google.golang.org/genproto/googleapis/api v0.0.0-20250721164621-a45f3dfb1074 h1:mVXdvnmR3S3BQOqHECm9NGMjYiRtEvDYcqAqedTXY6s=
-google.golang.org/genproto/googleapis/api v0.0.0-20250324211829-b45e905df463/go.mod h1:U90ffi8eUL9MwPcrJylN5+Mk2v3vuPDptd5yyNUiRR8=
+google.golang.org/genproto/googleapis/api v0.0.0-20250721164621-a45f3dfb1074/go.mod h1:vYFwMYFbmA8vl6Z/krj/h7+U/AqpHknwJX4Uqgfyc7I=
-google.golang.org/genproto/googleapis/api v0.0.0-20250715232539-7130f93afb79 h1:iOye66xuaAK0WnkPuhQPUFy8eJcmwUXqGGP3om6IxX8=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20250721164621-a45f3dfb1074 h1:qJW29YvkiJmXOYMu5Tf8lyrTp3dOS+K4z6IixtLaCf8=
-google.golang.org/genproto/googleapis/api v0.0.0-20250715232539-7130f93afb79/go.mod h1:HKJDgKsFUnv5VAGeQjz8kxcgDP0HoE0iZNp0OdZNlhE=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20250721164621-a45f3dfb1074/go.mod h1:qQ0YXyHHx3XkvlzUtpXDkS29lDSafHMZBAZDc03LQ3A=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20250324211829-b45e905df463 h1:e0AIkUUhxyBKh6ssZNrAMeqhA7RKUj42346d1y02i2g=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20250324211829-b45e905df463/go.mod h1:qQ0YXyHHx3XkvlzUtpXDkS29lDSafHMZBAZDc03LQ3A=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20250715232539-7130f93afb79 h1:1ZwqphdOdWYXsUHgMpU/101nCtf/kSp9hOrcvFsnl10=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20250715232539-7130f93afb79/go.mod h1:qQ0YXyHHx3XkvlzUtpXDkS29lDSafHMZBAZDc03LQ3A=
-google.golang.org/grpc v1.71.0 h1:kF77BGdPTQ4/JZWMlb9VpJ5pa25aqvVqogsxNHHdeBg=
-google.golang.org/grpc v1.71.0/go.mod h1:H0GRtasmQOh9LkFoCPDu3ZrwUtD1YGE+b2vYBYd/8Ec=
 google.golang.org/grpc v1.73.0 h1:VIWSmpI2MegBtTuFt5/JWy2oXxtjJ/e89Z70ImfD2ok=
 google.golang.org/grpc v1.73.0/go.mod h1:50sbHOUqWoCQGI8V2HQLJM0B+LMlIUjNSZmow7EVBQc=
 google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.5.1 h1:F29+wU6Ee6qgu9TddPgooOdaqsxTMunOoj8KA5yuS5A=
@@ -203,5 +165,6 @@ google.golang.org/protobuf v1.36.6/go.mod h1:jduwjTPXsFjZGTmRluh+L6NjiWu7pchiJ2/
 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=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

main.go

@@ -15,20 +15,32 @@ import (
 	"fmt"
 	"os"
 	"os/signal"
+	"sync"
+	"time"
 
-	"github.com/rs/zerolog/log"
+	"github.com/rs/zerolog"
 	"golang.org/x/sys/unix"
 
 	"gitea.libretechconsulting.com/rmcguire/go-app/pkg/app"
-	optsgrpc "gitea.libretechconsulting.com/rmcguire/go-app/pkg/srv/grpc/opts"
-	optshttp "gitea.libretechconsulting.com/rmcguire/go-app/pkg/srv/http/opts"
 
 	"gitea.libretechconsulting.com/rmcguire/go-server-with-otel/pkg/config"
-	"gitea.libretechconsulting.com/rmcguire/go-server-with-otel/pkg/demogrpc"
+	"gitea.libretechconsulting.com/rmcguire/go-server-with-otel/pkg/demo"
-	"gitea.libretechconsulting.com/rmcguire/go-server-with-otel/pkg/demohttp"
+	"gitea.libretechconsulting.com/rmcguire/go-server-with-otel/pkg/service"
 )
 
-var flagSchema bool
+const terminationGracePeriod = 30 * time.Second
+
+var (
+	// TODO: Register your service.AppService implementers here
+	// This should be the only change necessary here
+	// NOTE: At least one service needs to add a dial option
+	// for transport credentials, otherwise you will have to do it here
+	appServices = []service.AppService{
+		&demo.DemoService{},
+	}
+
+	flagSchema bool
+)
 
 func main() {
 	ctx, cncl := signal.NotifyContext(context.Background(), os.Interrupt, unix.SIGTERM)
@@ -37,7 +49,9 @@ func main() {
 	// Load configuration and setup logging. The go-app framework
 	// will handle loading config and environment into our demo
 	// app config struct which embeds app.AooConfig
-	ctx, demoApp := app.MustLoadConfigInto(ctx, &config.DemoConfig{})
+	ctx, serviceConfig := app.MustLoadConfigInto(ctx, &config.ServiceConfig{})
+
+	log := zerolog.Ctx(ctx)
 
 	// Print schema if that's all we have to do
 	if flagSchema {
@@ -45,32 +59,50 @@ func main() {
 		os.Exit(1)
 	}
 
-	log.Debug().Any("demoAppMergedConfig", demoApp).Msg("demo app config prepared")
+	log.Debug().Any("mergedConfig", serviceConfig).Msg("App configuration prepared")
 
-	// Prepare servers
+	// Prepare services
-	demoHTTP := demohttp.NewDemoHTTPServer(ctx, demoApp)
+	var err error
-	demoGRPC := demogrpc.NewDemoGRPCServer(ctx, demoApp)
+	sdFuncs := make([]service.ShutdownFunc, len(appServices))
+	for i, svc := range appServices {
+		sdFuncs[i], err = svc.Init(ctx, serviceConfig)
+		if err != nil {
+			log.Fatal().Err(err).Send()
+		}
+	}
 
-	// Prepare app
+	// Merge all service implementations for app
+	grpcSvcs, httpSvcs := service.MergeServices(ctx, appServices...)
+
+	// Prepare app with all merged services
 	app := &app.App{
 		AppContext: ctx,
-		GRPC: &optsgrpc.AppGRPC{
+		GRPC:       grpcSvcs,
-			Services:     demoGRPC.GetServices(),
+		HTTP:       httpSvcs,
-			GRPCDialOpts: demoGRPC.GetDialOpts(),
-		},
-		HTTP: &optshttp.AppHTTP{
-			Ctx:          ctx,
-			HealthChecks: demoHTTP.GetHealthCheckFuncs(),
-			Funcs:        demoHTTP.GetHandleFuncs(),
-		},
 	}
 
 	// Launch app
 	app.MustRun()
 
-	// Wait for app to complete
+	// Wait for app to complete and then perform internal shutdown
-	// Perform any extra shutdown here
 	<-app.Done()
+
+	log.Info().Int("numServices", len(appServices)).Msg("shutting down app services")
+
+	sdCtx, cncl := context.WithTimeout(context.Background(), terminationGracePeriod)
+	defer cncl()
+
+	// Call registered shutdown funcs from all services
+	var sdWg sync.WaitGroup
+	for _, sdFunc := range sdFuncs {
+		sdWg.Add(1)
+		go func() {
+			defer sdWg.Done()
+			svcName, err := sdFunc(sdCtx)
+			log.Err(err).Str("service", svcName).Msg("terminated")
+		}()
+	}
+	sdWg.Wait()
 }
 
 // flag.Parse will be called by go-app
@@ -79,7 +111,7 @@ func init() {
 }
 
 func printSchema() {
-	bytes, err := app.CustomSchema(&config.DemoConfig{})
+	bytes, err := app.CustomSchema(&config.ServiceConfig{})
 	if err != nil {
 		panic(err)
 	}

pkg/config/custom.go

@@ -1,13 +1,14 @@
-// This serves as a reference sample configuration
+// Package config contains ServiceConfig, which is intended
-// to show how to merge custom config fields into
+// to extend go-app/pkg/config.AppConfig. Add any custom fields
-// go-app configuration
+// here, and it will automatically be handled by go-app, including
+// overrides by environment, and json schema generation
 package config
 
 import (
 	"gitea.libretechconsulting.com/rmcguire/go-app/pkg/config"
 )
 
-type DemoConfig struct {
+type ServiceConfig struct {
 	Timezone string    `yaml:"timezone" json:"timezone,omitempty" default:"UTC"`
 	Opts     *DemoOpts `yaml:"opts" json:"opts,omitempty"`
 

pkg/demo/demo.go

@@ -0,0 +1,54 @@
+// Package demo provides a reference implementation
+// of service.AppService. It packages out the GRPC and HTTP
+// functionality, for the sake of structure.
+package demo
+
+import (
+	"context"
+
+	optsgrpc "gitea.libretechconsulting.com/rmcguire/go-app/pkg/srv/grpc/opts"
+	optshttp "gitea.libretechconsulting.com/rmcguire/go-app/pkg/srv/http/opts"
+
+	"gitea.libretechconsulting.com/rmcguire/go-server-with-otel/pkg/config"
+	"gitea.libretechconsulting.com/rmcguire/go-server-with-otel/pkg/demo/demogrpc"
+	"gitea.libretechconsulting.com/rmcguire/go-server-with-otel/pkg/demo/demohttp"
+	"gitea.libretechconsulting.com/rmcguire/go-server-with-otel/pkg/service"
+)
+
+type DemoService struct {
+	ctx    context.Context
+	config *config.ServiceConfig
+	http   *demohttp.DemoHTTPServer
+	grpc   *demogrpc.DemoGRPCServer
+}
+
+func (d *DemoService) Init(ctx context.Context, config *config.ServiceConfig,
+) (service.ShutdownFunc, error) {
+	d.config = config
+	d.ctx = ctx
+
+	// These don't HAVE to be split into separate packages
+	// This is, after all, a demo app. Just implement the interface.
+	d.http = demohttp.NewDemoHTTPServer(ctx, config)
+	d.grpc = demogrpc.NewDemoGRPCServer(ctx, config)
+
+	// TODO: This should actually do shutdown stuff
+	return func(_ context.Context) (string, error) {
+		return "DemoService", nil
+	}, nil
+}
+
+func (d *DemoService) GetGRPC() *optsgrpc.AppGRPC {
+	return &optsgrpc.AppGRPC{
+		Services:     d.grpc.GetServices(),
+		GRPCDialOpts: d.grpc.GetDialOpts(),
+	}
+}
+
+func (d *DemoService) GetHTTP() *optshttp.AppHTTP {
+	return &optshttp.AppHTTP{
+		Ctx:          d.ctx,
+		Funcs:        d.http.GetHandleFuncs(),
+		HealthChecks: d.http.GetHealthCheckFuncs(),
+	}
+}

pkg/demo/demogrpc/demo.go

@@ -27,12 +27,12 @@ const (
 type DemoGRPCServer struct {
 	tracer trace.Tracer
 	ctx    context.Context
-	cfg    *config.DemoConfig
+	cfg    *config.ServiceConfig
 	client *resty.Client
 	pb.UnimplementedDemoAppServiceServer
 }
 
-func NewDemoGRPCServer(ctx context.Context, cfg *config.DemoConfig) *DemoGRPCServer {
+func NewDemoGRPCServer(ctx context.Context, cfg *config.ServiceConfig) *DemoGRPCServer {
 	if cfg.Opts == nil {
 		cfg.Opts = &config.DemoOpts{}
 	}

pkg/demo/demohttp/server.go

@@ -11,10 +11,10 @@ import (
 
 type DemoHTTPServer struct {
 	ctx context.Context
-	cfg *config.DemoConfig
+	cfg *config.ServiceConfig
 }
 
-func NewDemoHTTPServer(ctx context.Context, cfg *config.DemoConfig) *DemoHTTPServer {
+func NewDemoHTTPServer(ctx context.Context, cfg *config.ServiceConfig) *DemoHTTPServer {
 	return &DemoHTTPServer{
 		ctx: ctx,
 		cfg: cfg,

pkg/service/service.go

@@ -0,0 +1,63 @@
+// Package service defines generics around implementation of
+// a new service that provides configuration for go-app
+//
+// The interface is meant to make the template more clear to implement
+// without unnecessary changes in main.go
+package service
+
+import (
+	"context"
+
+	"gitea.libretechconsulting.com/rmcguire/go-server-with-otel/pkg/config"
+
+	optsgrpc "gitea.libretechconsulting.com/rmcguire/go-app/pkg/srv/grpc/opts"
+	optshttp "gitea.libretechconsulting.com/rmcguire/go-app/pkg/srv/http/opts"
+)
+
+type ShutdownFunc func(ctx context.Context) (string, error)
+
+type AppService interface {
+	Init(ctx context.Context, config *config.ServiceConfig) (ShutdownFunc, error)
+	GetGRPC() *optsgrpc.AppGRPC
+	GetHTTP() *optshttp.AppHTTP
+}
+
+// MergeServices is used if multiple services are served by this server
+// with their own distinct packages and configuration
+//
+// You should be overriding the done chan, listener, or any other
+// configuration used by the SERVER rather than the individual services.
+func MergeServices(ctx context.Context, appServices ...AppService) (*optsgrpc.AppGRPC, *optshttp.AppHTTP) {
+	mergedGRPC := &optsgrpc.AppGRPC{}
+	for _, svc := range appServices {
+		mergedGRPC = mergeGRPC(mergedGRPC, svc.GetGRPC())
+	}
+
+	mergedHTTP := &optshttp.AppHTTP{}
+	for _, svc := range appServices {
+		mergedHTTP = mergeHTTP(mergedHTTP, svc.GetHTTP())
+	}
+	mergedHTTP.Ctx = ctx
+
+	return mergedGRPC, mergedHTTP
+}
+
+func mergeHTTP(a *optshttp.AppHTTP, b *optshttp.AppHTTP) *optshttp.AppHTTP {
+	return &optshttp.AppHTTP{
+		Funcs:        append(a.Funcs, b.Funcs...),
+		Middleware:   append(a.Middleware, b.Middleware...),
+		Handlers:     append(a.Handlers, b.Handlers...),
+		HealthChecks: append(a.HealthChecks, b.HealthChecks...),
+	}
+}
+
+func mergeGRPC(a *optsgrpc.AppGRPC, b *optsgrpc.AppGRPC) *optsgrpc.AppGRPC {
+	return &optsgrpc.AppGRPC{
+		Services:           append(a.Services, b.Services...),
+		GRPCOpts:           append(a.GRPCOpts, b.GRPCOpts...),
+		UnaryInterceptors:  append(a.UnaryInterceptors, b.UnaryInterceptors...),
+		StreamInterceptors: append(a.StreamInterceptors, b.StreamInterceptors...),
+		GRPCDialOpts:       append(a.GRPCDialOpts, b.GRPCDialOpts...),
+		GRPCGatewayOpts:    append(a.GRPCGatewayOpts, b.GRPCGatewayOpts...),
+	}
+}

proto/demo/app/v1alpha1/app.proto

@@ -1,6 +1,7 @@
 syntax = "proto3";
 package demo.app.v1alpha1;
 
+import "buf/validate/validate.proto";
 import "google/api/annotations.proto";
 import "google/protobuf/timestamp.proto";
 
@@ -9,7 +10,7 @@ option go_package = "gitea.libretechconsulting.com/rmcguire/go-server-with-otel/
 // Options for random fact, in this case
 // just a language
 message GetDemoRequest {
-  optional string language = 1;
+  optional string language = 1 [(buf.validate.field).string.min_len = 2];
 }
 
 // Returns a randome fact, because this is a demo app
@@ -18,7 +19,7 @@ message GetDemoResponse {
   google.protobuf.Timestamp timestamp = 1;
   string fact = 2;
   string source = 3;
-  string language = 4;
+  string language = 4 [(buf.validate.field).string.min_len = 2];
 }
 
 service DemoAppService {