refactor actions to improve testability

actions/model.go

@@ -0,0 +1,129 @@
+package actions
+
+import (
+	"fmt"
+	"log"
+	"os"
+
+	"github.com/howeyc/gopass"
+)
+
+type workflowModel struct {
+	On       string
+	Resolves []string
+}
+
+type actionModel struct {
+	Needs   []string
+	Uses    string
+	Runs    []string
+	Args    []string
+	Env     map[string]string
+	Secrets []string
+}
+
+type workflowsFile struct {
+	Workflow map[string]workflowModel
+	Action   map[string]actionModel
+}
+
+func (wFile *workflowsFile) getWorkflow(eventName string) (*workflowModel, string, error) {
+	var rtn workflowModel
+	for wName, w := range wFile.Workflow {
+		if w.On == eventName {
+			rtn = w
+			return &rtn, wName, nil
+		}
+	}
+	return nil, "", fmt.Errorf("unsupported event: %v", eventName)
+}
+
+func (wFile *workflowsFile) getAction(actionName string) (*actionModel, error) {
+	if a, ok := wFile.Action[actionName]; ok {
+		return &a, nil
+	}
+	return nil, fmt.Errorf("unsupported action: %v", actionName)
+}
+
+// return a pipeline that is run in series.  pipeline is a list of steps to run in parallel
+func (wFile *workflowsFile) newExecutionGraph(actionNames ...string) [][]string {
+	// first, build a list of all the necessary actions to run, and their dependencies
+	actionDependencies := make(map[string][]string)
+	for len(actionNames) > 0 {
+		newActionNames := make([]string, 0)
+		for _, aName := range actionNames {
+			// make sure we haven't visited this action yet
+			if _, ok := actionDependencies[aName]; !ok {
+				actionDependencies[aName] = wFile.Action[aName].Needs
+				newActionNames = append(newActionNames, wFile.Action[aName].Needs...)
+			}
+		}
+		actionNames = newActionNames
+	}
+
+	// next, build an execution graph
+	graph := make([][]string, 0)
+	for len(actionDependencies) > 0 {
+		stage := make([]string, 0)
+		for aName, aDeps := range actionDependencies {
+			// make sure all deps are in the graph already
+			if listInLists(aDeps, graph...) {
+				stage = append(stage, aName)
+				delete(actionDependencies, aName)
+			}
+		}
+		if len(stage) == 0 {
+			log.Fatalf("Unable to build dependency graph!")
+		}
+		graph = append(graph, stage)
+	}
+
+	return graph
+}
+
+// return true iff all strings in srcList exist in at least one of the searchLists
+func listInLists(srcList []string, searchLists ...[]string) bool {
+	for _, src := range srcList {
+		found := false
+		for _, searchList := range searchLists {
+			for _, search := range searchList {
+				if src == search {
+					found = true
+				}
+			}
+		}
+		if !found {
+			return false
+		}
+	}
+	return true
+}
+
+var secretCache map[string]string
+
+func (action *actionModel) applyEnvironment(env map[string]string) {
+	for envKey, envValue := range action.Env {
+		env[envKey] = envValue
+	}
+
+	for _, secret := range action.Secrets {
+		if secretVal, ok := os.LookupEnv(secret); ok {
+			env[secret] = secretVal
+		} else {
+			if secretCache == nil {
+				secretCache = make(map[string]string)
+			}
+
+			if _, ok := secretCache[secret]; !ok {
+				fmt.Printf("Provide value for '%s': ", secret)
+				val, err := gopass.GetPasswdMasked()
+				if err != nil {
+					log.Fatal("abort")
+				}
+
+				secretCache[secret] = string(val)
+			}
+			env[secret] = secretCache[secret]
+		}
+	}
+}