main.go

package main

import (
	"log"
	"os"
	"strconv"
	"time"

	"braces.dev/errtrace"
	"github.com/joho/godotenv"
	_ "github.com/joho/godotenv/autoload"
	"github.com/urfave/cli/v2"
)

// Version set at compile-time
var (
	Version string
)

func main() {
	// Load env-file if it exists first
	if filename, found := os.LookupEnv("PLUGIN_ENV_FILE"); found {
		_ = godotenv.Load(filename)
	}

	app := cli.NewApp()
	app.Name = "Drone Lambda"
	app.Usage = "Deploying Lambda code with drone CI to an existing function"
	app.Copyright = "Copyright (c) " + strconv.Itoa(time.Now().Year()) + " Bo-Yi Wu"
	app.Authors = []*cli.Author{
		{
			Name:  "Bo-Yi Wu",
			Email: "appleboy.tw@gmail.com",
		},
	}
	app.Action = run
	app.Version = Version
	app.Flags = []cli.Flag{
		&cli.StringFlag{
			Name:    "region",
			Usage:   "AWS Region",
			EnvVars: []string{"PLUGIN_REGION", "PLUGIN_AWS_REGION", "INPUT_AWS_REGION"},
		},
		&cli.StringFlag{
			Name:    "access-key",
			Usage:   "AWS ACCESS KEY",
			EnvVars: []string{"PLUGIN_ACCESS_KEY", "PLUGIN_AWS_ACCESS_KEY_ID", "INPUT_AWS_ACCESS_KEY_ID"},
		},
		&cli.StringFlag{
			Name:    "secret-key",
			Usage:   "AWS SECRET KEY",
			EnvVars: []string{"PLUGIN_SECRET_KEY", "PLUGIN_AWS_SECRET_ACCESS_KEY", "INPUT_AWS_SECRET_ACCESS_KEY"},
		},
		&cli.StringFlag{
			Name:    "session-token",
			Usage:   "AWS Session token",
			EnvVars: []string{"PLUGIN_SESSION_TOKEN", "PLUGIN_AWS_SESSION_TOKEN", "INPUT_AWS_SESSION_TOKEN"},
		},
		&cli.StringFlag{
			Name:    "aws-profile",
			Usage:   "AWS profile",
			EnvVars: []string{"PLUGIN_PROFILE", "PLUGIN_AWS_PROFILE", "INPUT_AWS_PROFILE"},
		},
		&cli.StringFlag{
			Name:    "function-name",
			Usage:   "AWS lambda function name",
			EnvVars: []string{"PLUGIN_FUNCTION_NAME", "FUNCTION_NAME", "INPUT_FUNCTION_NAME"},
		},
		&cli.StringFlag{
			Name:    "reversion-id",
			Usage:   "Only update the function if the revision ID matches the ID that's specified.",
			EnvVars: []string{"PLUGIN_REVERSION_ID", "REVERSION_ID", "INPUT_REVERSION_ID"},
		},
		&cli.StringFlag{
			Name:    "s3-bucket",
			Usage:   "An Amazon S3 bucket in the same AWS Region as your function. The bucket can be in a different AWS account.",
			EnvVars: []string{"PLUGIN_S3_BUCKET", "S3_BUCKET", "INPUT_S3_BUCKET"},
		},
		&cli.StringFlag{
			Name:    "s3-key",
			Usage:   "The Amazon S3 key of the deployment package.",
			EnvVars: []string{"PLUGIN_S3_KEY", "S3_KEY", "INPUT_S3_KEY"},
		},
		&cli.StringFlag{
			Name:    "s3-object-version",
			Usage:   "AWS lambda s3 object version",
			EnvVars: []string{"PLUGIN_S3_OBJECT_VERSION", "S3_OBJECT_VERSION", "INPUT_S3_OBJECT_VERSION"},
		},
		&cli.StringFlag{
			Name:    "zip-file",
			Usage:   "AWS lambda zip file",
			EnvVars: []string{"PLUGIN_ZIP_FILE", "ZIP_FILE", "INPUT_ZIP_FILE"},
		},
		&cli.StringSliceFlag{
			Name:    "source",
			Usage:   "zip file list",
			EnvVars: []string{"PLUGIN_SOURCE", "SOURCE", "INPUT_SOURCE"},
		},
		&cli.BoolFlag{
			Name:    "dry-run",
			Usage:   "Set to true to validate the request parameters and access permissions without modifying the function code.",
			EnvVars: []string{"PLUGIN_DRY_RUN", "DRY_RUN", "INPUT_DRY_RUN"},
		},
		&cli.BoolFlag{
			Name:    "debug",
			Usage:   "Show debug message after upload the lambda successfully.",
			EnvVars: []string{"PLUGIN_DEBUG", "DEBUG", "INPUT_DEBUG"},
		},
		&cli.BoolFlag{
			Name:    "publish",
			Usage:   "Set to true to publish a new version of the function after updating the code.",
			EnvVars: []string{"PLUGIN_PUBLISH", "PUBLISH", "INPUT_PUBLISH"},
		},
		&cli.Int64Flag{
			Name:    "memory-size",
			Usage:   "The amount of memory that your function has access to. Increasing the function's memory also increases its CPU allocation. The default value is 128 MB. The value must be a multiple of 64 MB.",
			EnvVars: []string{"PLUGIN_MEMORY_SIZE", "MEMORY_SIZE", "INPUT_MEMORY_SIZE"},
		},
		&cli.Int64Flag{
			Name:    "timeout",
			Usage:   "The amount of time that Lambda allows a function to run before stopping it. The default is 3 seconds. The maximum allowed value is 900 seconds.",
			EnvVars: []string{"PLUGIN_TIMEOUT", "TIMEOUT", "INPUT_TIMEOUT"},
		},
		&cli.StringFlag{
			Name:    "handler",
			Usage:   "The name of the method within your code that Lambda calls to execute your function.",
			EnvVars: []string{"PLUGIN_HANDLER", "HANDLER", "INPUT_HANDLER"},
		},
		&cli.StringFlag{
			Name:    "role",
			Usage:   "The Amazon Resource Name (ARN) of the function's execution role.",
			EnvVars: []string{"PLUGIN_ROLE", "ROLE", "INPUT_ROLE"},
		},
		&cli.StringFlag{
			Name:    "runtime",
			Usage:   "The identifier of the function's runtime.",
			EnvVars: []string{"PLUGIN_RUNTIME", "RUNTIME", "INPUT_RUNTIME"},
		},
		&cli.StringSliceFlag{
			Name:    "environment",
			Usage:   "Lambda Environment variables",
			EnvVars: []string{"PLUGIN_ENVIRONMENT", "ENVIRONMENT", "INPUT_ENVIRONMENT"},
		},
		&cli.StringSliceFlag{
			Name:    "layers",
			Usage:   "A list of function layers",
			EnvVars: []string{"PLUGIN_LAYERS", "LAYERS", "INPUT_LAYERS"},
		},
		&cli.StringFlag{
			Name:    "commit.sha",
			Usage:   "git commit sha",
			EnvVars: []string{"DRONE_COMMIT_SHA", "GITHUB_SHA"},
		},
		&cli.StringFlag{
			Name:    "commit.author",
			Usage:   "git author name",
			EnvVars: []string{"DRONE_COMMIT_AUTHOR"},
		},
		&cli.StringFlag{
			Name:    "image-uri",
			Usage:   "URI of a container image in the Amazon ECR registry.",
			EnvVars: []string{"PLUGIN_IMAGE_URI", "IMAGE_URI", "INPUT_IMAGE_URI"},
		},
		&cli.StringSliceFlag{
			Name:    "subnets",
			Usage:   "Select the VPC subnets for Lambda to use to set up your VPC configuration.",
			EnvVars: []string{"PLUGIN_SUBNETS", "SUBNETS", "INPUT_SUBNETS"},
		},
		&cli.StringSliceFlag{
			Name:    "securitygroups",
			Usage:   "Choose the VPC security groups for Lambda to use to set up your VPC configuration.",
			EnvVars: []string{"PLUGIN_SECURITY_GROUPS", "SECURITY_GROUPS", "INPUT_SECURITY_GROUPS"},
		},
		&cli.StringFlag{
			Name:    "description",
			Usage:   "A description of the function.",
			EnvVars: []string{"PLUGIN_DESCRIPTION", "DESCRIPTION", "INPUT_DESCRIPTION"},
		},
		&cli.StringFlag{
			Name:    "tracing-mode",
			Usage:   "The function's X-Ray tracing configuration.",
			EnvVars: []string{"PLUGIN_TRACING_MODE", "TRACING_MODE", "INPUT_TRACING_MODE"},
		},
		&cli.IntFlag{
			Name:    "max-attempts",
			Usage:   "the maximum number of times the waiter should attempt to check the resource for the target state",
			EnvVars: []string{"PLUGIN_MAX_ATTEMPTS", "MAX_ATTEMPTS", "INPUT_MAX_ATTEMPTS"},
			Value:   200,
		},
	}

	if err := app.Run(os.Args); err != nil {
		log.Fatal(err)
	}
}

func run(c *cli.Context) error {
	plugin := Plugin{
		Config: Config{
			Region:          c.String("region"),
			AccessKey:       c.String("access-key"),
			SecretKey:       c.String("secret-key"),
			Profile:         c.String("aws-profile"),
			S3Bucket:        c.String("s3-bucket"),
			S3Key:           c.String("s3-key"),
			S3ObjectVersion: c.String("s3-object-version"),
			ZipFile:         c.String("zip-file"),
			FunctionName:    c.String("function-name"),
			ReversionID:     c.String("reversion-id"),
			Source:          c.StringSlice("source"),
			DryRun:          c.Bool("dry-run"),
			Debug:           c.Bool("debug"),
			Publish:         c.Bool("publish"),
			Timeout:         c.Int64("timeout"),
			MemorySize:      c.Int64("memory-size"),
			Handler:         c.String("handler"),
			Role:            c.String("role"),
			Runtime:         c.String("runtime"),
			Environment:     c.StringSlice("environment"),
			Layers:          c.StringSlice("layers"),
			ImageURI:        c.String("image-uri"),
			Subnets:         c.StringSlice("subnets"),
			SecurityGroups:  c.StringSlice("securitygroups"),
			Description:     c.String("description"),
			SessionToken:    c.String("session-token"),
			TracingMode:     c.String("tracing-mode"),
			MaxAttempts:     c.Int("max-attempts"),
		},
		Commit: Commit{
			Sha:    c.String("commit.sha"),
			Author: c.String("commit.author"),
		},
	}

	return errtrace.Wrap(plugin.Exec())
}