feat: added base repo scaffolding

.editorconfig

@@ -0,0 +1,23 @@
+; https://editorconfig.org/
+
+root = true
+
+[*]
+charset = utf-8
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[{Makefile,go.mod,go.sum,*.go,.gitmodules}]
+indent_size = 4
+indent_style = tab
+
+[*.md]
+indent_size = 4
+trim_trailing_whitespace = false
+
+eclint_indent_style = unset
+
+[Dockerfile]
+indent_size = 4

.golangci.yml

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+run:
+  # Timeout for analysis, e.g. 30s, 5m.
+  timeout: 5m
+
+  # Include test files.
+  tests: true
+
+issues:
+  # Set to 0 to not skip any issues.
+  max-issues-per-linter: 0
+
+  # Set to 0 to not skip any issues.
+  max-same-issues: 0
+
+output:
+  # Sort results by: filepath, then line, then column.
+  sort-results: true
+
+  # Make issues output unique by line.
+  uniq-by-line: false
+
+linters:
+  # Enable specific linter
+  enable:
+    # Detect context.Context contained in structs.
+    - containedctx
+    # Check whether a function uses a non-inherited context.
+    - contextcheck
+    # Find declarations and assignments with too many blank identifiers.
+    - dogsled
+    # Check for unchecked errors.
+    - errcheck
+    # Find code that will cause problems with the error wrapping scheme.
+    - errorlint
+    # Find exporting pointers for loop variables.
+    - exportloopref
+    # Inspects source code for security problems.
+    - gosec
+    # Check that compiler directives are valid.
+    - gocheckcompilerdirectives
+    # Calculate cognitive complexities of functions.
+    - gocognit
+    # Find repeated strings that could be replaced by a constant.
+    - goconst
+    # Provides functionalities missing from other linters.
+    - gocritic
+    # Calculates cyclomatic complexity of a function.
+    - gocyclo
+    # Check if comments end with a dot.
+    - godot
+    # A stricter replacement for gofmt.
+    - gofumpt
+    # GO Magic Number Detector.
+    - gomnd
+    # Simplify the code.
+    - gosimple
+    # Check for correctness of programs.
+    - govet
+    # Detect ineffectual assignments.
+    - ineffassign
+    # Correct commonly misspelled English words in source files.
+    - misspell
+    # Finds the code that returns nil even if it checks that the error is not nil.
+    - nilerr
+    # Checks that there is no simultaneous return of nil error and an invalid value.
+    - nilnil
+    # Find incorrect usages of t.Parallel().
+    - paralleltest
+    # Reports direct reads from proto message fields when getters should be used.
+    - protogetter
+    # Drop-in replacement of golint.
+    - revive
+    # Ensure consistent code style when using log/slog.
+    - sloglint
+    # Find bugs and performance issues statically.
+    - staticcheck
+    # Checks Go code for unused constants, variables, functions and types.
+    - unused
+    # Empty lines linter.
+    - wsl
+
+# Setting of specific linters.
+linters-settings:
+  paralleltest:
+    # Ignore missing calls to `t.Parallel()` and only report incorrect uses of it.
+    ignore-missing: false
+
+  sloglint:
+    # Enforce using key-value pairs only (incompatible with attr-only).
+    kv-only: true
+    # Enforce a single key naming convention.
+    key-naming-case: snake

Makefile

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+# Copyright 2023 Linode, LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+SHELL := /usr/bin/env bash -o errexit -o pipefail -o nounset
+.DEFAULT_GOAL := help
+
+GO ?= go
+ENGINE ?= docker
+
+VERSION ?= $(shell git rev-parse HEAD)
+TOOLCHAIN_VERSION := $(shell sed -En 's/^go (.*)$$/\1/p' go.mod)
+
+REGISTRY := docker.io
+IMAGE := linode/linode-cosi-driver
+
+CONTAINERFILE ?= Dockerfile
+OCI_TAGS += --tag=${REGISTRY}/${IMAGE}:${VERSION}
+OCI_BUILDARGS += --build-arg=VERSION=${VERSION}
+
+LDFLAGS ?=
+GOFLAGS ?=
+GO_SETTINGS += CGO_ENABLED=0
+
+.PHONY: all
+all: test build image # Run all targets.
+
+.PHONY: build
+build: clean # Build the binary.
+	${GO_SETTINGS} ${GO} build \
+		${GOFLAGS} \
+		-ldflags="${LDFLAGS}" \
+		-o ./bin/${NAME} \
+		./cmd/linode-cosi-driver
+
+.PHONY: image
+image: clean-image # Build container image.
+	${ENGINE} build \
+		${OCI_TAGS} ${OCI_BUILDARGS} \
+		--file=${CONTAINERFILE} \
+		--target=runtime \
+		.
+
+.PHONY: test
+test: # Run unit tests.
+	${GO} test ${GOFLAGS} \
+		-race \
+		-cover -covermode=atomic -coverprofile=coverage.out \
+		./...
+
+.PHONY: e2e
+e2e: # Run end to end tests. (FIXME: this is placeholder)
+	@-echo "this is placeholder"
+
+.PHONY: clean
+clean: # Clean the previous build files.
+	@rm -rf ./bin
+
+.PHONY: clean-image
+clean-image: # Attempt to remove the old container image builds.
+	@-${ENGINE} image rm -f $(shell ${ENGINE} image ls -aq ${REGISTRY}/${REPOSITORY}/${NAME}:${VERSION} | xargs -n1 | sort -u | xargs)
+
+.PHONY: help
+help: # Show help for each of the Makefile recipes.
+	@grep -E '^[a-zA-Z0-9 -]+:.*#'  Makefile | while read -r l; do printf "\033[1;32m$$(echo $$l | cut -f 1 -d':')\033[00m:$$(echo $$l | cut -f 2- -d'#')\n"; done

cmd/linode-cosi-driver/main.go

@@ -0,0 +1,164 @@
+// Copyright 2023 Linode, LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"log/slog"
+	"net/url"
+	"os"
+	"os/signal"
+	"sync"
+	"syscall"
+	"time"
+
+	"github.com/grpc-ecosystem/go-grpc-middleware/v2/interceptors/logging"
+	"github.com/grpc-ecosystem/go-grpc-middleware/v2/interceptors/recovery"
+	"github.com/linode/linode-cosi-driver/internal/endpoint"
+	"github.com/linode/linode-cosi-driver/internal/envflag"
+	"github.com/linode/linode-cosi-driver/internal/grpc/handlers"
+	"github.com/linode/linode-cosi-driver/internal/grpc/logger"
+	"github.com/linode/linode-cosi-driver/pkg/servers/identity"
+	"github.com/linode/linode-cosi-driver/pkg/servers/provisioner"
+	"google.golang.org/grpc"
+	cosi "sigs.k8s.io/container-object-storage-interface-spec"
+)
+
+var log *slog.Logger
+
+const (
+	driverName  = "objectstorage.cosi.linode.com"
+	gracePeriod = 5 * time.Second
+)
+
+func main() {
+	linodeToken := envflag.String("LINODE_TOKEN", "")
+	linodeURL := envflag.String("LINODE_API_URL", "")
+	cosiEndpoint := envflag.String("COSI_ENDPOINT", "unix:///var/lib/cosi/cosi.sock")
+
+	// TODO: any logger settup must be done here, before first log call.
+	log = slog.Default()
+
+	if err := realMain(context.Background(), cosiEndpoint, linodeToken, linodeURL); err != nil {
+		slog.Error("critical failure", "error", err)
+		os.Exit(1)
+	}
+}
+
+func realMain(ctx context.Context, cosiEndpoint, _, _ string) error {
+	ctx, stop := signal.NotifyContext(ctx, os.Interrupt, syscall.SIGINT, syscall.SIGTERM)
+	defer stop()
+
+	// create identity server
+	idSrv, err := identity.New(driverName)
+	if err != nil {
+		return fmt.Errorf("failed to create identity server: %w", err)
+	}
+
+	// create provisioner server
+	prvSrv, err := provisioner.New(log)
+	if err != nil {
+		return fmt.Errorf("failed to create provisioner server: %w", err)
+	}
+
+	// parse endpoint
+	endpointURL, err := url.Parse(cosiEndpoint)
+	if err != nil {
+		return fmt.Errorf("unable to parse COSI endpoint: %w", err)
+	}
+
+	// create the endpoint handler
+	lis, err := endpoint.New(endpointURL).Listener(ctx)
+	if err != nil {
+		return fmt.Errorf("unable to create new listener: %w", err)
+	}
+	defer lis.Close()
+
+	// create the grpcServer
+	srv, err := grpcServer(ctx, idSrv, prvSrv)
+	if err != nil {
+		return fmt.Errorf("gRPC server creation failed: %w", err)
+	}
+
+	var wg sync.WaitGroup
+
+	wg.Add(1)
+
+	go shutdown(ctx, &wg, srv)
+
+	slog.Info("starting server", "endpoint", endpointURL)
+
+	err = srv.Serve(lis)
+	if err != nil {
+		return fmt.Errorf("gRPC server failed: %w", err)
+	}
+
+	wg.Wait()
+
+	return nil
+}
+
+func grpcServer(ctx context.Context, identity cosi.IdentityServer, provisioner cosi.ProvisionerServer) (*grpc.Server, error) {
+	server := grpc.NewServer(
+		grpc.ChainUnaryInterceptor(
+			logging.UnaryServerInterceptor(logger.Wrap(log)),
+			recovery.UnaryServerInterceptor(recovery.WithRecoveryHandler(handlers.PanicRecovery(ctx, log))),
+		),
+	)
+
+	if identity == nil || provisioner == nil {
+		return nil, errors.New("provisioner and identity servers cannot be nil")
+	}
+
+	cosi.RegisterIdentityServer(server, identity)
+	cosi.RegisterProvisionerServer(server, provisioner)
+
+	return server, nil
+}
+
+// shutdown handles shutdown with grace period consideration.
+func shutdown(ctx context.Context, wg *sync.WaitGroup, g *grpc.Server) {
+	<-ctx.Done()
+	defer wg.Done()
+	defer slog.Info("stopped")
+
+	slog.Info("shutting down")
+
+	dctx, stop := context.WithTimeout(context.Background(), gracePeriod)
+	defer stop()
+
+	c := make(chan struct{})
+
+	if g != nil {
+		go func() {
+			g.GracefulStop()
+			c <- struct{}{}
+		}()
+
+		for {
+			select {
+			case <-dctx.Done():
+				slog.Warn("forcing shutdown")
+				g.Stop()
+
+				return
+			case <-c:
+				return
+			}
+		}
+	}
+}

cmd/linode-cosi-driver/main_test.go

@@ -0,0 +1,31 @@
+// Copyright 2023 Linode, LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main_test
+
+import "testing"
+
+func TestRealMain(t *testing.T) {
+	t.Parallel()
+
+	for _, tc := range []struct {
+		testName string
+	}{} {
+		tc := tc
+
+		t.Run(tc.testName, func(t *testing.T) {
+			t.Parallel()
+		})
+	}
+}