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/
main.go
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/
main.go
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package main
import (
"encoding/json"
"errors"
"fmt"
"os"
"strings"
"time"
"github.com/ngmiller/fabrik/lambda"
"github.com/ngmiller/fabrik/repo"
"github.com/ngmiller/fabrik/secure"
"github.com/ngmiller/fabrik/stack"
"github.com/ngmiller/fabrik/types"
"github.com/aws/aws-lambda-go/events"
awsLambda "github.com/aws/aws-lambda-go/lambda"
"github.com/aws/aws-lambda-go/lambdacontext"
"github.com/aws/aws-sdk-go/aws/session"
log "github.com/sirupsen/logrus"
)
const (
// Execution timeout in seconds
ExecutionTimeout = 300
)
func init() {
log.SetFormatter(&log.JSONFormatter{DisableTimestamp: true})
}
func main() {
awsLambda.Start(Handler)
}
// Handler serves as the integration point between the AWS event and business logic by
// preparing conrete types to satisfy the Handler's interface.
func Handler(dynamoEvent events.DynamoDBEvent) error {
defer func() {
if r := recover(); r != nil {
log.Errorln("recovered from panic:", r)
}
}()
// AWS session
sess := session.Must(session.NewSession())
for _, record := range dynamoEvent.Records {
// skip modify and remove events from dynamo
if record.EventName != types.DynamoDBEventInsert {
log.Warnln("received non INSERT event from dynamo - no action")
return nil
}
// parse github event
item := record.Change.NewImage
eventType := item["type"].String()
rawEvent := []byte(item["payload"].String())
if eventType != types.EventTypePush {
log.Warnln("received non-push event:", eventType, "- no action")
return nil
}
var event types.GitHubEvent
if err := json.Unmarshal(rawEvent, &event); err != nil {
log.Errorln("json.Unmarshal", err.Error())
return nil
}
log := log.WithFields(log.Fields{
"ref": parseRef(event.Ref),
"commit": shortHash(event.After),
"repo": event.Repository.Name,
})
// do nothing if branch contains NOBUILD
if strings.Contains(event.Ref, "NOBUILD") {
log.Warnln("received event ref requests no build - no action")
return nil
}
// fetch secure repo token
secureStore := secure.NewAWSSecureStore(sess)
token, err := secureStore.Get(types.KeyToken)
if err != nil {
log.Errorln("parameter.Get", err.Error())
return nil
}
// prepare processing dependencies
stackManager := stack.NewAWSStackManager(log, sess)
lambdaManager := lambda.NewAWSLambdaManager(sess)
repo := repo.NewGitHubRepository(log, event.Repository.Owner.Name, event.Repository.Name, token)
shortHash := shortHash(event.After)
// status - pending
repo.Status(event.After, prepStatus(types.GitStatePending, shortHash))
// wait until we get a concrete stack status
// or 90% of the execution timeout has been used, in which case, restart
stop := make(chan struct{})
status := Process(log, stop, event, repo, stackManager, token)
select {
case err = <-status:
if err != nil {
log.Errorln("error processing event:", err.Error())
repo.Status(event.After, prepStatus(types.GitStateFailure, shortHash))
return nil
}
case <-time.After(0.9 * ExecutionTimeout * time.Second):
log.Infoln("execution timeout reached, restarting function!")
close(stop)
return lambdaManager.Invoke(lambdacontext.FunctionName, dynamoEvent)
}
// status - ok
repo.Status(event.After, prepStatus(types.GitStateSuccess, shortHash))
}
return nil
}
// Process reacts to GitHub push event writes from the DynamoDB table stream
// and processes them for building. Each incoming event structure is the exact JSON from GitHub.
// We assume we are _only_ receiving push events at this time.
// Incoming refs are of the form 'ref/{heads|tag}/{value}'
//
// A repository's 'stack' in this context means an infrastructure template (i.e. CloudFormation)
// defining the CI pipeline, build and deployment resources.
//
// Each pipeline is parameterized via a parameters.json file in the repo. Each parameter set
// is keyed by 'development', 'staging', and 'production' - corresponding to the CodePipeline instance
// by the same name ('development' parameters are applied to all non master/tag refs)
//
// if ref is tag:
// stack = {repo}-production
// if ref = 'master':
// stack = {repo}-staging
// else:
// stack = {repo}-{ref}
//
// if event.deleted:
// if not exists(stack): warn and skip
// else: delete stack
// return
//
// prepare context and set parameters
//
// create or update stack with parameters
// if tag: call UpdatePipeline with tag
//
// monitor stack progress
// if stack was updated:
// start pipeline
//
func Process(log *log.Entry, stop <-chan struct{}, event types.GitHubEvent, repo types.Repository, manager types.StackManager, repoToken string) <-chan error {
result := make(chan error)
go func() {
// Get stack state, delete if necessary
stack := stackName(event.Repository.Name, event.Ref)
exists, status, err := manager.Status(stack)
if err != nil {
result <- err
return
}
if event.Deleted {
if !exists {
log.Warnln("received push/deleted event for non-existant stack")
result <- nil
return
}
result <- manager.Delete(stack)
return
}
// fetch stack and parameter files from repoistory
// pipeline.json - CI/CD pipeline stack spec
// parameters.json - stack parameters
context, err := buildContext(event, repo, "pipeline.json", "parameters.json")
if err != nil {
result <- err
return
}
// ammend parameter list with required parameters
context.Parameters = append(
context.Parameters, requiredParameters(event, repoToken, os.Getenv("ARTIFACT_STORE"))...)
// create or update stack with ref specific parameters
if !exists {
// create - pipeline is started automatically when created
log.Infoln("stack create", stack)
if err := manager.Create(stack, context.Parameters, context.PipelineTemplate); err != nil {
result <- err
return
}
} else {
// only do an update if we aren't already in progress, otherwise, continue monitoring
if statusComplete(status) || statusFailed(status) {
log.Infoln("stack update", stack)
if err := manager.Update(stack, context.Parameters, context.PipelineTemplate); err != nil {
result <- err
return
}
}
}
if err := Watch(log, stop, manager, stack); err != nil {
result <- err
return
}
if exists {
log.Infoln("start build")
if err := manager.StartBuild(stack); err != nil {
result <- err
return
}
}
result <- nil
}()
return result
}
// Watch monitors the state of stack operation, returning an error if there
// was an error in that operation. This function will continue to monitor the stack in
// a loop until it receives a signal to stop from the given channel.
func Watch(log *log.Entry, stop <-chan struct{}, manager types.StackManager, stack string) error {
for {
select {
case <-stop:
log.Infoln("stack monitor received stop signal")
return errors.New("received stop signal")
default:
_, status, err := manager.Status(stack)
if err != nil {
return err
}
// fail if status comes back as 'rollback' or 'failed' - something failed
if statusRollback(status) || statusFailed(status) {
log.Infoln("stack status", status)
return errors.New("stack rollback or failure")
}
// continue waiting if stack status isn't complete
if !statusComplete(status) {
log.Infoln("stack status", status)
time.Sleep(time.Second)
continue
}
log.Infoln("stack status", status)
return nil
}
}
}
//
// Helpers
//
func stackName(repo, ref string) string {
if refType(ref) == types.GitRefMaster {
return fmt.Sprintf("%s-staging", repo)
}
if refType(ref) == types.GitRefTag {
return fmt.Sprintf("%s-production", repo)
}
return fmt.Sprintf("%s-%s", repo, parseRef(ref))
}
func shortHash(hash string) string {
if len(hash) < 6 {
return hash
}
return hash[:6]
}
func statusUrl(logGroup, logStream, shortHash string) string {
base := fmt.Sprintf("https://%s.console.aws.amazon.com", os.Getenv("AWS_REGION"))
path := fmt.Sprintf("/cloudwatch/home?region=%s#logEventViewer:group=%s;stream=%s;filter=%s",
os.Getenv("AWS_REGION"),
logGroup,
logStream,
shortHash,
)
return base + path
}
func statusComplete(status string) bool {
return types.RegexCompleted.MatchString(status)
}
func statusRollback(status string) bool {
return types.RegexRollback.MatchString(status)
}
func statusFailed(status string) bool {
return types.RegexFailed.MatchString(status)
}
func parseRef(ref string) string {
components := strings.Split(ref, "/")
return components[len(components)-1]
}
func parseParameters(parameters []byte) (types.ParameterManifest, error) {
var parsed types.ParameterManifest
if err := json.Unmarshal(parameters, &parsed); err != nil {
return parsed, err
}
return parsed, nil
}
func prepStatus(state, shortHash string) types.GitHubStatus {
return types.GitHubStatus{
State: state,
Context: types.GitContextPrep,
TargetUrl: statusUrl(lambdacontext.LogGroupName, lambdacontext.LogStreamName, shortHash),
}
}
func requiredParameters(event types.GitHubEvent, repoToken, artifactStore string) []types.Parameter {
stage := "development"
branch := parseRef(event.Ref)
if refType(event.Ref) == types.GitRefMaster {
stage = "staging"
}
if refType(event.Ref) == types.GitRefTag {
stage = "production"
branch = "master"
}
return []types.Parameter{
types.Parameter{ParameterKey: "ArtifactStore", ParameterValue: artifactStore},
types.Parameter{ParameterKey: "RepoOwner", ParameterValue: event.Repository.Owner.Name},
types.Parameter{ParameterKey: "RepoName", ParameterValue: event.Repository.Name},
types.Parameter{ParameterKey: "RepoBranch", ParameterValue: branch},
types.Parameter{ParameterKey: "RepoToken", ParameterValue: repoToken},
types.Parameter{ParameterKey: "Stage", ParameterValue: stage},
}
}
func refType(ref string) string {
parsed := parseRef(ref)
if parsed == types.GitRefMaster {
return types.GitRefMaster
} else if types.RegexTagRef.MatchString(parsed) {
return types.GitRefTag
}
return types.GitRefBranch
}
func buildContext(event types.GitHubEvent, repo types.Repository, pipelinePath, parameterPath string) (types.BuildContext, error) {
// pipeline template (required)
pipelineTemplate, err := repo.Get(event.Ref, pipelinePath)
if err != nil {
return types.BuildContext{}, err
}
// parameter manifest (required)
parameterSpec, err := repo.Get(event.Ref, parameterPath)
if err != nil {
return types.BuildContext{}, err
}
parameterManifest, err := parseParameters(parameterSpec)
if err != nil {
return types.BuildContext{}, err
}
// Default to development parameters, set staging or production accordingly
parameters := parameterManifest.Development
if refType(event.Ref) == types.GitRefMaster {
parameters = parameterManifest.Staging
}
if refType(event.Ref) == types.GitRefTag {
parameters = parameterManifest.Production
}
context := types.BuildContext{
PipelineTemplate: pipelineTemplate,
Parameters: parameters,
}
return context, nil
}