|
| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "fmt" |
| 6 | + "io/ioutil" |
| 7 | + "log" |
| 8 | + "net/http" |
| 9 | + "os" |
| 10 | + "os/signal" |
| 11 | + "sort" |
| 12 | + "sync" |
| 13 | + |
| 14 | + "github.com/aws/aws-sdk-go-v2/aws" |
| 15 | + "github.com/aws/aws-sdk-go-v2/config" |
| 16 | + "github.com/aws/aws-sdk-go-v2/service/lambda" |
| 17 | + "github.com/aws/aws-sdk-go-v2/service/lambda/types" |
| 18 | + "golang.org/x/sync/errgroup" |
| 19 | +) |
| 20 | + |
| 21 | +type LayerInfo struct { |
| 22 | + Name string |
| 23 | + Description string |
| 24 | + Architecture types.Architecture |
| 25 | + |
| 26 | + LayerContentOnce sync.Once |
| 27 | + LayerContent []byte |
| 28 | +} |
| 29 | + |
| 30 | +// canonicalLayers are the layers that we want to keep in sync across all regions |
| 31 | +var canonicalLayers = []LayerInfo{ |
| 32 | + { |
| 33 | + Name: "AWSLambdaPowertoolsPythonV2", |
| 34 | + Description: "Lambda Powertools for Python [x86_64] with extra dependencies version bump", |
| 35 | + Architecture: types.ArchitectureX8664, |
| 36 | + }, |
| 37 | + { |
| 38 | + Name: "AWSLambdaPowertoolsPythonV2-Arm64", |
| 39 | + Description: "Lambda Powertools for Python [arm64] with extra dependencies version bump", |
| 40 | + Architecture: types.ArchitectureArm64, |
| 41 | + }, |
| 42 | +} |
| 43 | + |
| 44 | +// regions are the regions that we want to keep in sync |
| 45 | +var regions = []string{ |
| 46 | + "af-south-1", |
| 47 | + "eu-central-1", |
| 48 | + "us-east-1", |
| 49 | + "us-east-2", |
| 50 | + "us-west-1", |
| 51 | + "us-west-2", |
| 52 | + "ap-east-1", |
| 53 | + "ap-south-1", |
| 54 | + "ap-northeast-1", |
| 55 | + "ap-northeast-2", |
| 56 | + "ap-southeast-1", |
| 57 | + "ap-southeast-2", |
| 58 | + "ca-central-1", |
| 59 | + "eu-west-1", |
| 60 | + "eu-west-2", |
| 61 | + "eu-west-3", |
| 62 | + "eu-south-1", |
| 63 | + "eu-north-1", |
| 64 | + "sa-east-1", |
| 65 | + "ap-southeast-3", |
| 66 | + "ap-northeast-3", |
| 67 | + "me-south-1", |
| 68 | +} |
| 69 | + |
| 70 | +// getLayerVersion returns the latest version of a layer in a region |
| 71 | +func getLayerVersion(ctx context.Context, layerName string, region string) (int64, error) { |
| 72 | + cfg, err := config.LoadDefaultConfig(ctx, config.WithRegion(region)) |
| 73 | + if err != nil { |
| 74 | + return 0, err |
| 75 | + } |
| 76 | + |
| 77 | + lambdaSvc := lambda.NewFromConfig(cfg) |
| 78 | + |
| 79 | + layerVersionsResult, err := lambdaSvc.ListLayerVersions(ctx, &lambda.ListLayerVersionsInput{ |
| 80 | + LayerName: aws.String(layerName), |
| 81 | + MaxItems: aws.Int32(1), |
| 82 | + }) |
| 83 | + if err != nil { |
| 84 | + return 0, err |
| 85 | + } |
| 86 | + |
| 87 | + if len(layerVersionsResult.LayerVersions) == 0 { |
| 88 | + return 0, fmt.Errorf("no layer meets the search criteria %s - %s", layerName, region) |
| 89 | + } |
| 90 | + return layerVersionsResult.LayerVersions[0].Version, nil |
| 91 | +} |
| 92 | + |
| 93 | +// getGreatestVersion returns the greatest version of a layer across all regions |
| 94 | +func getGreatestVersion(ctx context.Context) (int64, error) { |
| 95 | + var versions []int64 |
| 96 | + |
| 97 | + g, ctx := errgroup.WithContext(ctx) |
| 98 | + |
| 99 | + for idx := range canonicalLayers { |
| 100 | + layer := &canonicalLayers[idx] |
| 101 | + |
| 102 | + for _, region := range regions { |
| 103 | + layerName := layer.Name |
| 104 | + ctx := ctx |
| 105 | + region := region |
| 106 | + |
| 107 | + g.Go(func() error { |
| 108 | + version, err := getLayerVersion(ctx, layerName, region) |
| 109 | + if err != nil { |
| 110 | + return err |
| 111 | + } |
| 112 | + |
| 113 | + log.Printf("[%s] %s -> %d", layerName, region, version) |
| 114 | + |
| 115 | + versions = append(versions, version) |
| 116 | + return nil |
| 117 | + }) |
| 118 | + } |
| 119 | + } |
| 120 | + |
| 121 | + if err := g.Wait(); err != nil { |
| 122 | + return 0, err |
| 123 | + } |
| 124 | + |
| 125 | + // Find the maximum version by reverse sorting the versions array |
| 126 | + sort.Slice(versions, func(i, j int) bool { return versions[i] > versions[j] }) |
| 127 | + return versions[0], nil |
| 128 | +} |
| 129 | + |
| 130 | +// balanceRegionToVersion creates a new layer version in a region with the same contents as the canonical layer, until it matches the maxVersion |
| 131 | +func balanceRegionToVersion(ctx context.Context, region string, layer *LayerInfo, maxVersion int64) error { |
| 132 | + currentLayerVersion, err := getLayerVersion(ctx, layer.Name, region) |
| 133 | + if err != nil { |
| 134 | + return fmt.Errorf("error getting layer version: %w", err) |
| 135 | + } |
| 136 | + |
| 137 | + cfg, err := config.LoadDefaultConfig(ctx, config.WithRegion(region)) |
| 138 | + if err != nil { |
| 139 | + return err |
| 140 | + } |
| 141 | + |
| 142 | + lambdaSvc := lambda.NewFromConfig(cfg) |
| 143 | + |
| 144 | + for i := currentLayerVersion; i < maxVersion; i++ { |
| 145 | + log.Printf("[%s] Bumping %s to version %d (max %d)", layer.Name, region, i, maxVersion) |
| 146 | + |
| 147 | + payload, err := downloadCanonicalLayerZip(ctx, layer) |
| 148 | + if err != nil { |
| 149 | + return fmt.Errorf("error downloading canonical zip: %w", err) |
| 150 | + } |
| 151 | + |
| 152 | + layerVersionResponse, err := lambdaSvc.PublishLayerVersion(ctx, &lambda.PublishLayerVersionInput{ |
| 153 | + Content: &types.LayerVersionContentInput{ |
| 154 | + ZipFile: payload, |
| 155 | + }, |
| 156 | + LayerName: aws.String(layer.Name), |
| 157 | + CompatibleArchitectures: []types.Architecture{layer.Architecture}, |
| 158 | + CompatibleRuntimes: []types.Runtime{types.RuntimePython37, types.RuntimePython38, types.RuntimePython39}, |
| 159 | + Description: aws.String(layer.Description), |
| 160 | + LicenseInfo: aws.String("MIT-0"), |
| 161 | + }) |
| 162 | + if err != nil { |
| 163 | + return fmt.Errorf("error publishing layer version: %w", err) |
| 164 | + } |
| 165 | + |
| 166 | + _, err = lambdaSvc.AddLayerVersionPermission(ctx, &lambda.AddLayerVersionPermissionInput{ |
| 167 | + Action: aws.String("lambda:GetLayerVersion"), |
| 168 | + LayerName: aws.String(layer.Name), |
| 169 | + Principal: aws.String("*"), |
| 170 | + StatementId: aws.String("PublicLayerAccess"), |
| 171 | + VersionNumber: layerVersionResponse.Version, |
| 172 | + }) |
| 173 | + if err != nil { |
| 174 | + return fmt.Errorf("error making layer public: %w", err) |
| 175 | + } |
| 176 | + } |
| 177 | + |
| 178 | + return nil |
| 179 | +} |
| 180 | + |
| 181 | +// balanceRegions creates new layer versions in all regions with the same contents as the canonical layer, until they match the maxVersion |
| 182 | +func balanceRegions(ctx context.Context, maxVersion int64) error { |
| 183 | + g, ctx := errgroup.WithContext(ctx) |
| 184 | + |
| 185 | + for idx := range canonicalLayers { |
| 186 | + layer := &canonicalLayers[idx] |
| 187 | + |
| 188 | + for _, region := range regions { |
| 189 | + ctx := ctx |
| 190 | + region := region |
| 191 | + layer := layer |
| 192 | + version := maxVersion |
| 193 | + |
| 194 | + g.Go(func() error { |
| 195 | + return balanceRegionToVersion(ctx, region, layer, version) |
| 196 | + }) |
| 197 | + } |
| 198 | + } |
| 199 | + |
| 200 | + if err := g.Wait(); err != nil { |
| 201 | + return err |
| 202 | + } |
| 203 | + |
| 204 | + return nil |
| 205 | +} |
| 206 | + |
| 207 | +// downloadCanonicalLayerZip downloads the canonical layer zip file that will be used to bump the versions later |
| 208 | +func downloadCanonicalLayerZip(ctx context.Context, layer *LayerInfo) ([]byte, error) { |
| 209 | + var innerErr error |
| 210 | + |
| 211 | + layer.LayerContentOnce.Do(func() { |
| 212 | + // We use eu-central-1 as the canonical region to download the Layer from |
| 213 | + cfg, err := config.LoadDefaultConfig(ctx, config.WithRegion("eu-central-1")) |
| 214 | + if err != nil { |
| 215 | + innerErr = err |
| 216 | + } |
| 217 | + |
| 218 | + lambdaSvc := lambda.NewFromConfig(cfg) |
| 219 | + |
| 220 | + // Gets the latest version of the layer |
| 221 | + version, err := getLayerVersion(ctx, layer.Name, "eu-central-1") |
| 222 | + if err != nil { |
| 223 | + innerErr = fmt.Errorf("error getting eu-central-1 layer version: %w", err) |
| 224 | + } |
| 225 | + |
| 226 | + // Gets the Layer content URL from S3 |
| 227 | + getLayerVersionResult, err := lambdaSvc.GetLayerVersion(ctx, &lambda.GetLayerVersionInput{ |
| 228 | + LayerName: aws.String(layer.Name), |
| 229 | + VersionNumber: version, |
| 230 | + }) |
| 231 | + if err != nil { |
| 232 | + innerErr = fmt.Errorf("error getting eu-central-1 layer download URL: %w", err) |
| 233 | + } |
| 234 | + |
| 235 | + s3LayerUrl := getLayerVersionResult.Content.Location |
| 236 | + log.Printf("[%s] Downloading Layer from %s", layer.Name, *s3LayerUrl) |
| 237 | + |
| 238 | + resp, err := http.Get(*s3LayerUrl) |
| 239 | + if err != nil { |
| 240 | + innerErr = err |
| 241 | + } |
| 242 | + defer resp.Body.Close() |
| 243 | + |
| 244 | + body, err := ioutil.ReadAll(resp.Body) |
| 245 | + if err != nil { |
| 246 | + innerErr = err |
| 247 | + } |
| 248 | + |
| 249 | + layer.LayerContent = body |
| 250 | + }) |
| 251 | + |
| 252 | + return layer.LayerContent, innerErr |
| 253 | +} |
| 254 | + |
| 255 | +func main() { |
| 256 | + ctx := context.Background() |
| 257 | + |
| 258 | + // Cancel everything if interrupted |
| 259 | + ctx, cancel := context.WithCancel(ctx) |
| 260 | + c := make(chan os.Signal, 1) |
| 261 | + signal.Notify(c, os.Interrupt) |
| 262 | + defer func() { |
| 263 | + signal.Stop(c) |
| 264 | + cancel() |
| 265 | + }() |
| 266 | + go func() { |
| 267 | + select { |
| 268 | + case <-c: |
| 269 | + cancel() |
| 270 | + case <-ctx.Done(): |
| 271 | + } |
| 272 | + }() |
| 273 | + |
| 274 | + // Find the greatest layer version across all regions |
| 275 | + greatestVersion, err := getGreatestVersion(ctx) |
| 276 | + if err != nil { |
| 277 | + cancel() |
| 278 | + log.Printf("error getting layer version: %s", err) |
| 279 | + os.Exit(1) |
| 280 | + } |
| 281 | + log.Printf("Greatest version is %d. Bumping all versions...", greatestVersion) |
| 282 | + |
| 283 | + // Elevate all regions to the greatest layer version found |
| 284 | + err = balanceRegions(ctx, greatestVersion) |
| 285 | + if err != nil { |
| 286 | + cancel() |
| 287 | + log.Printf("error balancing regions: %s", err) |
| 288 | + os.Exit(1) |
| 289 | + } |
| 290 | + |
| 291 | + log.Printf("DONE! All layers should be version %d", greatestVersion) |
| 292 | +} |
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