platform: modularize api/gui, add docs-tests-web foundation, and refresh root config

selective-vpn-api/app/dns_settings_state_upstreams.go

@@ -0,0 +1,104 @@
+package app
+
+import dnscfgpkg "selective-vpn-api/app/dnscfg"
+
+func dnscfgPoolItemsFromApp(items []DNSUpstreamPoolItem) []dnscfgpkg.UpstreamPoolItem {
+	out := make([]dnscfgpkg.UpstreamPoolItem, 0, len(items))
+	for _, item := range items {
+		out = append(out, dnscfgpkg.UpstreamPoolItem{
+			Addr:    item.Addr,
+			Enabled: item.Enabled,
+		})
+	}
+	return out
+}
+
+func dnscfgPoolItemsToApp(items []dnscfgpkg.UpstreamPoolItem) []DNSUpstreamPoolItem {
+	out := make([]DNSUpstreamPoolItem, 0, len(items))
+	for _, item := range items {
+		out = append(out, DNSUpstreamPoolItem{
+			Addr:    item.Addr,
+			Enabled: item.Enabled,
+		})
+	}
+	return out
+}
+
+func dnscfgUpstreamsFromApp(cfg DNSUpstreams) dnscfgpkg.Upstreams {
+	return dnscfgpkg.Upstreams{
+		Default1: cfg.Default1,
+		Default2: cfg.Default2,
+		Meta1:    cfg.Meta1,
+		Meta2:    cfg.Meta2,
+	}
+}
+
+func dnscfgUpstreamsToApp(cfg dnscfgpkg.Upstreams) DNSUpstreams {
+	return DNSUpstreams{
+		Default1: cfg.Default1,
+		Default2: cfg.Default2,
+		Meta1:    cfg.Meta1,
+		Meta2:    cfg.Meta2,
+	}
+}
+
+func dnscfgLegacyDefaults() dnscfgpkg.Upstreams {
+	return dnscfgpkg.Upstreams{
+		Default1: defaultDNS1,
+		Default2: defaultDNS2,
+		Meta1:    defaultMeta1,
+		Meta2:    defaultMeta2,
+	}
+}
+
+func normalizeDNSUpstreamPoolItems(items []DNSUpstreamPoolItem) []DNSUpstreamPoolItem {
+	return dnscfgPoolItemsToApp(
+		dnscfgpkg.NormalizeUpstreamPoolItems(dnscfgPoolItemsFromApp(items), normalizeDNSUpstream),
+	)
+}
+
+func dnsUpstreamPoolFromLegacy(cfg DNSUpstreams) []DNSUpstreamPoolItem {
+	return dnscfgPoolItemsToApp(
+		dnscfgpkg.UpstreamPoolFromLegacy(dnscfgUpstreamsFromApp(cfg), normalizeDNSUpstream),
+	)
+}
+
+func dnsUpstreamPoolToLegacy(items []DNSUpstreamPoolItem) DNSUpstreams {
+	return dnscfgUpstreamsToApp(
+		dnscfgpkg.UpstreamPoolToLegacy(
+			dnscfgPoolItemsFromApp(items),
+			dnscfgLegacyDefaults(),
+			normalizeDNSUpstream,
+		),
+	)
+}
+
+func loadEnabledDNSUpstreamPool() []string {
+	items := loadDNSUpstreamPoolState()
+	return uniqueStrings(
+		dnscfgpkg.EnabledPool(dnscfgPoolItemsFromApp(items), normalizeDNSUpstream),
+	)
+}
+
+// ---------------------------------------------------------------------
+// EN: `loadDNSUpstreamsConf` loads dns upstreams conf from storage or config.
+// RU: `loadDNSUpstreamsConf` - загружает dns upstreams conf из хранилища или конфига.
+// ---------------------------------------------------------------------
+func loadDNSUpstreamsConf() DNSUpstreams {
+	pool := loadDNSUpstreamPoolState()
+	if len(pool) > 0 {
+		return dnsUpstreamPoolToLegacy(pool)
+	}
+	return loadDNSUpstreamsConfFile()
+}
+
+// ---------------------------------------------------------------------
+// EN: `saveDNSUpstreamsConf` saves dns upstreams conf to persistent storage.
+// RU: `saveDNSUpstreamsConf` - сохраняет dns upstreams conf в постоянное хранилище.
+// ---------------------------------------------------------------------
+func saveDNSUpstreamsConf(cfg DNSUpstreams) error {
+	if err := saveDNSUpstreamsConfFile(cfg); err != nil {
+		return err
+	}
+	return saveDNSUpstreamPoolFile(dnsUpstreamPoolFromLegacy(cfg))
+}