[fix] #1300 Leave membership is stucking the whole blockchain

app/lib/dal/fileDAL.ts

@@ -519,9 +519,19 @@ export class FileDAL {
       .value()
   }
 
-  async findLeavers() {
-    const mss = await this.msDAL.getPendingOUT();
-    return _.chain(mss).sortBy((ms:any) => -ms.sigDate).value();
+  async findLeavers(blockMedianTime = 0) {
+    const pending = await this.msDAL.getPendingOUT();
+    const mss = await Promise.all(pending.map(async (p:any) => {
+      const reduced = await this.mindexDAL.getReducedMS(p.issuer)
+      if (!reduced || !reduced.chainable_on || blockMedianTime >= reduced.chainable_on || blockMedianTime < constants.TIME_TO_TURN_ON_BRG_107) {
+        return p
+      }
+      return null
+    }))
+    return _.chain(mss)
+      .filter((ms:any) => ms)
+      .sortBy((ms:any) => -ms.sigDate)
+      .value();
   }
 
   existsNonReplayableLink(from:string, to:string) {

app/modules/prover/lib/blockGenerator.ts

@@ -151,7 +151,7 @@ export class BlockGenerator {
 
   private async findLeavers(current:DBBlock) {
     const leaveData: { [pub:string]: any } = {};
-    const memberships = await this.dal.findLeavers();
+    const memberships = await this.dal.findLeavers(current && current.medianTime);
     const leavers:string[] = [];
     memberships.forEach((ms:any) => leavers.push(ms.issuer));
     for (const ms of memberships) {