update gateway compare

src/inventory.ts

@@ -174,20 +174,39 @@ class InventoryBuilder {
     };
   }
 
+  // frps还是frpc的积分，NAT越有利分越高
+  gatewayCompareScore(gateway: any): number { 
+    let score: number = 0xff - gateway.id;
+    const ipv4Score = ({
+      "static": 2,
+      "dynamic": 1
+    })[gateway.ipv4] || 0;
+    score |= ipv4Score << 12;
+    const ipv4NatScore = ({
+      "ports": 0,
+      "dmz": 1
+    })[gateway.ipv4_nat] || 2;
+    score |= ipv4NatScore << 10;
+    const globalSSHScore = ({
+      "globalssh": 1
+    })[gateway.ssh] || 0;
+    score |= globalSSHScore << 13;
+    return score;
+  }
+
   // true: 本地做 server，false: 远端做server
   // 如果都不能做，抛异常
   // 两个参数对调返回的结果必须相反
   gatewayCompare(localGateway: any, remoteGateway: any): boolean {
     // 两边至少一个有IPv4地址才能连
     assert(localGateway.ipv4 !== '' || remoteGateway.ipv4 !== '');
-    // 如果都static，就让列表中更靠前的做s
-    if (localGateway.ipv4 == remoteGateway.ipv4) {
-      return localGateway.id < remoteGateway.id;
-    } else if (localGateway.ipv4 === 'static' || remoteGateway.ipv4 === 'static') {
-      return localGateway.ipv4 === 'static';
-    } else { 
-      return localGateway.ipv4 === 'dynamic';
-    }
+    // 两边必须相反
+    assert(this.gatewayCompareScore(localGateway) !== this.gatewayCompareScore(remoteGateway));
+    // 两边只有一边是GlobalSSH的，GlobalSSH做s
+    // 只有一边有static的，就static做s
+    // 如果都static，那么没有NAT的或者dmz的做s
+    // 如果都还相同，就让列表中更靠前的做s
+    return this.gatewayCompareScore(localGateway) > this.gatewayCompareScore(remoteGateway);
   }
 
   async wgPublickey(privateKey) {