feat: backend native executor implement

internal/backendupdate/intents.go

@@ -0,0 +1,66 @@
+package backendupdate
+
+import (
+	"encoding/json"
+
+	"yms-daemon/internal/hostnginx"
+	"yms-daemon/internal/transaction"
+)
+
+func gatewaySwitchIntent(request persistedRequest, before hostnginx.Snapshot, after hostnginx.Snapshot) transaction.StepIntent {
+	return stepIntent("backend.gateway.switch", "switch host Nginx backend upstream", struct {
+		BeforePort int    `json:"beforePort"`
+		BeforeHash string `json:"beforeHash"`
+		AfterPort  int    `json:"afterPort"`
+		AfterHash  string `json:"afterHash"`
+	}{before.ActivePort, snapshotDigest(before), after.ActivePort, snapshotDigest(after)})
+}
+
+func activeLinkIntent(request persistedRequest, installedPath string) transaction.StepIntent {
+	return stepIntent("backend.native.active-link", "replace backend compatibility link", struct {
+		Path          string    `json:"path"`
+		Before        pathState `json:"before"`
+		InstalledPath string    `json:"installedPath"`
+	}{request.ActiveJARPath, request.ActiveJARBefore, installedPath})
+}
+
+func stopPreviousUnitIntent(request persistedRequest) transaction.StepIntent {
+	return stepIntent("backend.previous-unit.stop", "stop previous backend unit after drain", struct {
+		Unit string `json:"unit"`
+	}{request.PreviousUnit})
+}
+
+func activeLinkRestoreIntent(request persistedRequest) transaction.StepIntent {
+	return stepIntent("backend.native.active-link.restore", "restore backend compatibility path", struct {
+		Path   string    `json:"path"`
+		Before pathState `json:"before"`
+	}{request.ActiveJARPath, request.ActiveJARBefore})
+}
+
+func gatewayRestoreIntent(request persistedRequest) transaction.StepIntent {
+	return stepIntent("backend.gateway.restore", "restore host Nginx backend upstream", struct {
+		Port int `json:"port"`
+	}{request.PreviousGatewayPort})
+}
+
+func stopTargetUnitIntent(request persistedRequest) transaction.StepIntent {
+	return stepIntent("backend.target-unit.stop", "stop compensated backend target unit", struct {
+		Unit string `json:"unit"`
+	}{request.TargetUnit})
+}
+
+func restoreTargetSlotIntent(request persistedRequest, installedPath string) transaction.StepIntent {
+	return stepIntent("backend.target-slot.restore", "restore compensated backend target slot", struct {
+		Path           string `json:"path"`
+		InstalledPath  string `json:"installedPath"`
+		PreviousTarget string `json:"previousTarget"`
+	}{request.TargetSlotJAR, installedPath, request.PreviousSlotTarget})
+}
+
+func stepIntent(key string, name string, value any) transaction.StepIntent {
+	content, err := json.Marshal(value)
+	if err != nil {
+		panic(err)
+	}
+	return transaction.StepIntent{Key: key, Name: name, Intent: content}
+}