Document and test supported versions of Go

.github/workflows/ci.yaml

@@ -0,0 +1,53 @@
+name: CI
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+env:
+  DEFAULT_GO_VERSION: "~1.23.0"
+jobs:
+  generate-and-check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: ${{ env.DEFAULT_GO_VERSION }}
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          submodules: true
+      - name: Generate
+        run: make clean protobuf
+      - name: Check Clean Work Tree
+        run: make check-clean-work-tree
+  compatibility-test:
+    strategy:
+      matrix:
+        go-version: ["~1.23.0", "~1.22.4"]
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+      with:
+        submodules: true
+    - name: Install Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: ${{ matrix.go-version }}
+        check-latest: true
+        cache-dependency-path: "**/go.sum"
+    - name: Generate
+      run: make clean protobuf go-mod-tidy
+    - name: Run tests
+      run: make test
+  test-compatibility:
+    runs-on: ubuntu-latest
+    needs: [compatibility-test]
+    if: always()
+    steps:
+      - name: Test if compatibility-test workflow passed
+        run: |
+          echo ${{ needs.compatibility-test.result }}
+          test ${{ needs.compatibility-test.result }} == "success"

Makefile

@@ -39,6 +39,10 @@ endif
 GO                := go
 GO_VERSION        := 1.17
 GO_MOD_ROOT       := go.opentelemetry.io/proto
+ALL_GO_MOD_DIRS := $(shell find . -type f -name 'go.mod' -exec dirname {} \; | sort)
+OTEL_GO_MOD_DIRS := $(filter-out $(TOOLS_MOD_DIR), $(ALL_GO_MOD_DIRS))
+TIMEOUT = 60
+
 PROTOBUF_GEN_DIR  := opentelemetry-proto-gen
 PROTOBUF_TEMP_DIR := $(GEN_TEMP_DIR)/go
 
@@ -145,6 +149,21 @@ copy-otlp-protobuf-slim:
 clean:
 	rm -rf $(GEN_TEMP_DIR) $(OTLP_OUTPUT_DIR)/*/ $(OTLPSLIM_OUTPUT_DIR)/*/
 
+.PHONY: go-mod-tidy
+go-mod-tidy: $(ALL_GO_MOD_DIRS:%=go-mod-tidy/%)
+go-mod-tidy/%: DIR=$*
+go-mod-tidy/%:
+	@echo "$(GO) mod tidy in $(DIR)" \
+		&& cd $(DIR) \
+		&& $(GO) mod tidy -compat=1.21
+
+test: $(OTEL_GO_MOD_DIRS:%=test/%)
+test/%: DIR=$*
+test/%:
+	@echo "$(GO) test -timeout $(TIMEOUT)s $(ARGS) $(DIR)/..." \
+		&& cd $(DIR) \
+		&& $(GO) test -timeout $(TIMEOUT)s $(ARGS) ./...
+
 .PHONY: check-clean-work-tree
 check-clean-work-tree:
 	@if ! git diff --quiet; then \

README.md

@@ -43,3 +43,32 @@ import (
 	tracepb "go.opentelemetry.io/proto/otlp/trace/v1"
 )
 ```
+
+### Compatibility
+
+OpenTelemetry Proto Go ensures compatibility with the current supported
+versions of
+the [Go language](https://golang.org/doc/devel/release#policy):
+
+> Each major Go release is supported until there are two newer major releases.
+> For example, Go 1.5 was supported until the Go 1.7 release, and Go 1.6 was supported until the Go 1.8 release.
+
+For versions of Go that are no longer supported upstream, opentelemetry-proto-go will
+stop ensuring compatibility with these versions in the following manner:
+
+- A minor release of opentelemetry-proto-go will be made to add support for the new
+  supported release of Go.
+- The following minor release of opentelemetry-proto-go will remove compatibility
+  testing for the oldest (now archived upstream) version of Go. This, and
+  future, releases of opentelemetry-proto-=go may include features only supported by
+  the currently supported versions of Go.
+
+This project is tested on the following systems.
+
+| OS       | Go Version |
+| -------- | ---------- |
+| Ubuntu   | 1.23       |
+| Ubuntu   | 1.22       |
+
+While this project should work for other systems, no compatibility guarantees
+are made for those systems currently.

go.mod

@@ -1,3 +1,8 @@
 module go.opentelemetry.io/proto
 
-go 1.15
+go 1.22.0
+
+require (
+	go.opentelemetry.io/proto/otlp v1.3.1
+	google.golang.org/protobuf v1.35.2
+)

go.sum

@@ -0,0 +1,8 @@
+github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
+github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+go.opentelemetry.io/proto/otlp v1.3.1 h1:TrMUixzpM0yuc/znrFTP9MMRh8trP93mkCiDVeXrui0=
+go.opentelemetry.io/proto/otlp v1.3.1/go.mod h1:0X1WI4de4ZsLrrJNLAQbFeLCm3T7yBkR0XqQ7niQU+8=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+google.golang.org/protobuf v1.35.2 h1:8Ar7bF+apOIoThw1EdZl0p1oWvMqTHmpA2fRTyZO8io=
+google.golang.org/protobuf v1.35.2/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=

internal/tools/go.mod

@@ -1,5 +1,51 @@
 module go.opentelemetry.io/proto/internal/tools
 
-go 1.16
+go 1.22.0
 
 require go.opentelemetry.io/build-tools/multimod v0.14.0
+
+require (
+	dario.cat/mergo v1.0.0 // indirect
+	github.com/Microsoft/go-winio v0.6.1 // indirect
+	github.com/ProtonMail/go-crypto v1.0.0 // indirect
+	github.com/cloudflare/circl v1.3.7 // indirect
+	github.com/cyphar/filepath-securejoin v0.2.4 // indirect
+	github.com/emirpasic/gods v1.18.1 // indirect
+	github.com/fsnotify/fsnotify v1.7.0 // indirect
+	github.com/go-git/gcfg v1.5.1-0.20230307220236-3a3c6141e376 // indirect
+	github.com/go-git/go-billy/v5 v5.5.0 // indirect
+	github.com/go-git/go-git/v5 v5.12.0 // indirect
+	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
+	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99 // indirect
+	github.com/kevinburke/ssh_config v1.2.0 // indirect
+	github.com/magiconair/properties v1.8.7 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
+	github.com/pjbgf/sha1cd v0.3.0 // indirect
+	github.com/sagikazarmark/locafero v0.4.0 // indirect
+	github.com/sagikazarmark/slog-shim v0.1.0 // indirect
+	github.com/sergi/go-diff v1.3.2-0.20230802210424-5b0b94c5c0d3 // indirect
+	github.com/skeema/knownhosts v1.2.2 // indirect
+	github.com/sourcegraph/conc v0.3.0 // indirect
+	github.com/spf13/afero v1.11.0 // indirect
+	github.com/spf13/cast v1.6.0 // indirect
+	github.com/spf13/cobra v1.8.1 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/spf13/viper v1.19.0 // indirect
+	github.com/subosito/gotenv v1.6.0 // indirect
+	github.com/xanzy/ssh-agent v0.3.3 // indirect
+	go.opentelemetry.io/build-tools v0.14.0 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
+	golang.org/x/crypto v0.21.0 // indirect
+	golang.org/x/exp v0.0.0-20230905200255-921286631fa9 // indirect
+	golang.org/x/mod v0.19.0 // indirect
+	golang.org/x/net v0.23.0 // indirect
+	golang.org/x/sys v0.22.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
+	golang.org/x/tools v0.13.0 // indirect
+	gopkg.in/ini.v1 v1.67.0 // indirect
+	gopkg.in/warnings.v0 v0.1.2 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)