/
workflow.go
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/
workflow.go
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package model
import (
"fmt"
"io"
"reflect"
"regexp"
"strconv"
"strings"
"github.com/nektos/act/pkg/common"
log "github.com/sirupsen/logrus"
"gopkg.in/yaml.v3"
)
// Workflow is the structure of the files in .github/workflows
type Workflow struct {
File string
Name string `yaml:"name"`
RawOn yaml.Node `yaml:"on"`
Env map[string]string `yaml:"env"`
Jobs map[string]*Job `yaml:"jobs"`
Defaults Defaults `yaml:"defaults"`
}
// On events for the workflow
func (w *Workflow) On() []string {
switch w.RawOn.Kind {
case yaml.ScalarNode:
var val string
err := w.RawOn.Decode(&val)
if err != nil {
log.Fatal(err)
}
return []string{val}
case yaml.SequenceNode:
var val []string
err := w.RawOn.Decode(&val)
if err != nil {
log.Fatal(err)
}
return val
case yaml.MappingNode:
var val map[string]interface{}
err := w.RawOn.Decode(&val)
if err != nil {
log.Fatal(err)
}
var keys []string
for k := range val {
keys = append(keys, k)
}
return keys
}
return nil
}
// Job is the structure of one job in a workflow
type Job struct {
Name string `yaml:"name"`
RawNeeds yaml.Node `yaml:"needs"`
RawRunsOn yaml.Node `yaml:"runs-on"`
Env yaml.Node `yaml:"env"`
If yaml.Node `yaml:"if"`
Steps []*Step `yaml:"steps"`
TimeoutMinutes int64 `yaml:"timeout-minutes"`
Services map[string]*ContainerSpec `yaml:"services"`
Strategy *Strategy `yaml:"strategy"`
RawContainer yaml.Node `yaml:"container"`
Defaults Defaults `yaml:"defaults"`
Outputs map[string]string `yaml:"outputs"`
}
// Strategy for the job
type Strategy struct {
FailFast bool
MaxParallel int
FailFastString string `yaml:"fail-fast"`
MaxParallelString string `yaml:"max-parallel"`
RawMatrix yaml.Node `yaml:"matrix"`
}
// Default settings that will apply to all steps in the job or workflow
type Defaults struct {
Run RunDefaults `yaml:"run"`
}
// Defaults for all run steps in the job or workflow
type RunDefaults struct {
Shell string `yaml:"shell"`
WorkingDirectory string `yaml:"working-directory"`
}
// GetMaxParallel sets default and returns value for `max-parallel`
func (s Strategy) GetMaxParallel() int {
// MaxParallel default value is `GitHub will maximize the number of jobs run in parallel depending on the available runners on GitHub-hosted virtual machines`
// So I take the liberty to hardcode default limit to 4 and this is because:
// 1: tl;dr: self-hosted does only 1 parallel job - https://github.com/actions/runner/issues/639#issuecomment-825212735
// 2: GH has 20 parallel job limit (for free tier) - https://github.com/github/docs/blob/3ae84420bd10997bb5f35f629ebb7160fe776eae/content/actions/reference/usage-limits-billing-and-administration.md?plain=1#L45
// 3: I want to add support for MaxParallel to act and 20! parallel jobs is a bit overkill IMHO
maxParallel := 4
if s.MaxParallelString != "" {
var err error
if maxParallel, err = strconv.Atoi(s.MaxParallelString); err != nil {
log.Errorf("Failed to parse 'max-parallel' option: %v", err)
}
}
return maxParallel
}
// GetFailFast sets default and returns value for `fail-fast`
func (s Strategy) GetFailFast() bool {
// FailFast option is true by default: https://github.com/github/docs/blob/3ae84420bd10997bb5f35f629ebb7160fe776eae/content/actions/reference/workflow-syntax-for-github-actions.md?plain=1#L1107
failFast := true
log.Debug(s.FailFastString)
if s.FailFastString != "" {
var err error
if failFast, err = strconv.ParseBool(s.FailFastString); err != nil {
log.Errorf("Failed to parse 'fail-fast' option: %v", err)
}
}
return failFast
}
// Container details for the job
func (j *Job) Container() *ContainerSpec {
var val *ContainerSpec
switch j.RawContainer.Kind {
case yaml.ScalarNode:
val = new(ContainerSpec)
err := j.RawContainer.Decode(&val.Image)
if err != nil {
log.Fatal(err)
}
case yaml.MappingNode:
val = new(ContainerSpec)
err := j.RawContainer.Decode(val)
if err != nil {
log.Fatal(err)
}
}
return val
}
// Needs list for Job
func (j *Job) Needs() []string {
switch j.RawNeeds.Kind {
case yaml.ScalarNode:
var val string
err := j.RawNeeds.Decode(&val)
if err != nil {
log.Fatal(err)
}
return []string{val}
case yaml.SequenceNode:
var val []string
err := j.RawNeeds.Decode(&val)
if err != nil {
log.Fatal(err)
}
return val
}
return nil
}
// RunsOn list for Job
func (j *Job) RunsOn() []string {
switch j.RawRunsOn.Kind {
case yaml.ScalarNode:
var val string
err := j.RawRunsOn.Decode(&val)
if err != nil {
log.Fatal(err)
}
return []string{val}
case yaml.SequenceNode:
var val []string
err := j.RawRunsOn.Decode(&val)
if err != nil {
log.Fatal(err)
}
return val
}
return nil
}
func environment(yml yaml.Node) map[string]string {
env := make(map[string]string)
if yml.Kind == yaml.MappingNode {
if err := yml.Decode(&env); err != nil {
log.Fatal(err)
}
}
return env
}
// Environments returns string-based key=value map for a job
func (j *Job) Environment() map[string]string {
return environment(j.Env)
}
// Matrix decodes RawMatrix YAML node
func (j *Job) Matrix() map[string][]interface{} {
if j.Strategy.RawMatrix.Kind == yaml.MappingNode {
var val map[string][]interface{}
if err := j.Strategy.RawMatrix.Decode(&val); err != nil {
log.Fatal(err)
}
return val
}
return nil
}
// GetMatrixes returns the matrix cross product
// It skips includes and hard fails excludes for non-existing keys
// nolint:gocyclo
func (j *Job) GetMatrixes() []map[string]interface{} {
matrixes := make([]map[string]interface{}, 0)
if j.Strategy != nil {
j.Strategy.FailFast = j.Strategy.GetFailFast()
j.Strategy.MaxParallel = j.Strategy.GetMaxParallel()
if m := j.Matrix(); m != nil {
includes := make([]map[string]interface{}, 0)
for _, v := range m["include"] {
switch t := v.(type) {
case []interface{}:
for _, i := range t {
i := i.(map[string]interface{})
for k := range i {
if _, ok := m[k]; ok {
includes = append(includes, i)
break
}
}
}
case interface{}:
v := v.(map[string]interface{})
for k := range v {
if _, ok := m[k]; ok {
includes = append(includes, v)
break
}
}
}
}
delete(m, "include")
excludes := make([]map[string]interface{}, 0)
for _, e := range m["exclude"] {
e := e.(map[string]interface{})
for k := range e {
if _, ok := m[k]; ok {
excludes = append(excludes, e)
} else {
// We fail completely here because that's what GitHub does for non-existing matrix keys, fail on exclude, silent skip on include
log.Fatalf("The workflow is not valid. Matrix exclude key '%s' does not match any key within the matrix", k)
}
}
}
delete(m, "exclude")
matrixProduct := common.CartesianProduct(m)
MATRIX:
for _, matrix := range matrixProduct {
for _, exclude := range excludes {
if commonKeysMatch(matrix, exclude) {
log.Debugf("Skipping matrix '%v' due to exclude '%v'", matrix, exclude)
continue MATRIX
}
}
matrixes = append(matrixes, matrix)
}
for _, include := range includes {
log.Debugf("Adding include '%v'", include)
matrixes = append(matrixes, include)
}
} else {
matrixes = append(matrixes, make(map[string]interface{}))
}
} else {
matrixes = append(matrixes, make(map[string]interface{}))
}
return matrixes
}
func commonKeysMatch(a map[string]interface{}, b map[string]interface{}) bool {
for aKey, aVal := range a {
if bVal, ok := b[aKey]; ok && !reflect.DeepEqual(aVal, bVal) {
return false
}
}
return true
}
// ContainerSpec is the specification of the container to use for the job
type ContainerSpec struct {
Image string `yaml:"image"`
Env map[string]string `yaml:"env"`
Ports []string `yaml:"ports"`
Volumes []string `yaml:"volumes"`
Options string `yaml:"options"`
Credentials map[string]string `yaml:"credentials"`
Entrypoint string
Args string
Name string
Reuse bool
}
// Step is the structure of one step in a job
type Step struct {
ID string `yaml:"id"`
If yaml.Node `yaml:"if"`
Name string `yaml:"name"`
Uses string `yaml:"uses"`
Run string `yaml:"run"`
WorkingDirectory string `yaml:"working-directory"`
Shell string `yaml:"shell"`
Env yaml.Node `yaml:"env"`
With map[string]string `yaml:"with"`
ContinueOnError bool `yaml:"continue-on-error"`
TimeoutMinutes int64 `yaml:"timeout-minutes"`
}
// String gets the name of step
func (s *Step) String() string {
if s.Name != "" {
return s.Name
} else if s.Uses != "" {
return s.Uses
} else if s.Run != "" {
return s.Run
}
return s.ID
}
// Environments returns string-based key=value map for a step
func (s *Step) Environment() map[string]string {
return environment(s.Env)
}
// GetEnv gets the env for a step
func (s *Step) GetEnv() map[string]string {
env := s.Environment()
for k, v := range s.With {
envKey := regexp.MustCompile("[^A-Z0-9-]").ReplaceAllString(strings.ToUpper(k), "_")
envKey = fmt.Sprintf("INPUT_%s", strings.ToUpper(envKey))
env[envKey] = v
}
return env
}
// ShellCommand returns the command for the shell
func (s *Step) ShellCommand() string {
shellCommand := ""
//Reference: https://github.com/actions/runner/blob/8109c962f09d9acc473d92c595ff43afceddb347/src/Runner.Worker/Handlers/ScriptHandlerHelpers.cs#L9-L17
switch s.Shell {
case "", "bash":
shellCommand = "bash --noprofile --norc -e -o pipefail {0}"
case "pwsh":
shellCommand = "pwsh -command . '{0}'"
case "python":
shellCommand = "python {0}"
case "sh":
shellCommand = "sh -e -c {0}"
case "cmd":
shellCommand = "%ComSpec% /D /E:ON /V:OFF /S /C \"CALL \"{0}\"\""
case "powershell":
shellCommand = "powershell -command . '{0}'"
default:
shellCommand = s.Shell
}
return shellCommand
}
// StepType describes what type of step we are about to run
type StepType int
const (
// StepTypeRun is all steps that have a `run` attribute
StepTypeRun StepType = iota
// StepTypeUsesDockerURL is all steps that have a `uses` that is of the form `docker://...`
StepTypeUsesDockerURL
// StepTypeUsesActionLocal is all steps that have a `uses` that is a local action in a subdirectory
StepTypeUsesActionLocal
// StepTypeUsesActionRemote is all steps that have a `uses` that is a reference to a github repo
StepTypeUsesActionRemote
// StepTypeInvalid is for steps that have invalid step action
StepTypeInvalid
)
// Type returns the type of the step
func (s *Step) Type() StepType {
if s.Run != "" {
if s.Uses != "" {
return StepTypeInvalid
}
return StepTypeRun
} else if strings.HasPrefix(s.Uses, "docker://") {
return StepTypeUsesDockerURL
} else if strings.HasPrefix(s.Uses, "./") {
return StepTypeUsesActionLocal
}
return StepTypeUsesActionRemote
}
func (s *Step) Validate() error {
if s.Type() != StepTypeRun {
return fmt.Errorf("(StepID: %s): Unexpected value 'uses'", s.String())
} else if s.Shell == "" {
return fmt.Errorf("(StepID: %s): Required property is missing: 'shell'", s.String())
}
return nil
}
// ReadWorkflow returns a list of jobs for a given workflow file reader
func ReadWorkflow(in io.Reader) (*Workflow, error) {
w := new(Workflow)
err := yaml.NewDecoder(in).Decode(w)
return w, err
}
// GetJob will get a job by name in the workflow
func (w *Workflow) GetJob(jobID string) *Job {
for id, j := range w.Jobs {
if jobID == id {
if j.Name == "" {
j.Name = id
}
return j
}
}
return nil
}
// GetJobIDs will get all the job names in the workflow
func (w *Workflow) GetJobIDs() []string {
ids := make([]string, 0)
for id := range w.Jobs {
ids = append(ids, id)
}
return ids
}