update join

aqua-examples/ts-oracle/aqua/timestamp_getter.aqua

@@ -1,28 +0,0 @@
-import "builtin.aqua"
--- create and identity service to join our results
-service Op2("op"):
-    identity(s: u64)
-     array(a: string, b: u64) -> string
-
--- function to get ten timestamps from our Kademlia
--- neighborhood and return as an array of u64 timestamps
--- the function arguement node is our per id
-func ts_getter(node: string) -> []u64:
-  -- create a streaming variable
-  res: *u64
-  -- execute on the pecified peer
-  on node:
-    -- get the base58 representation of the peer id
-    k <- Op.string_to_b58(node)
-    -- find all (default 20) neighborhood peers from k
-    nodes <- Kademlia.neighborhood(k, nil, nil)
-    -- for each peer in our neighborhood and in parallel
-    for n <- nodes par:
-      on n:
-        -- try and get the peer's timestamp
-        try:
-          res <- Peer.timestamp_ms()
-    -- flatten nine of our joined results
-    Op2.identity(res!9)
-    -- return an array of ten timestamps
-  <- res

aqua-examples/ts-oracle/aqua/ts_getter.aqua

@@ -20,16 +20,16 @@ func ts_getter(node: string) -> []u64:
   on node:
     k <- Op.string_to_b58(node)
     nodes <- Kademlia.neighborhood(k, nil, nil)
-    for n <- nodes par:
-      on n:
-        try:
-          res <- Peer.timestamp_ms()
-    Op2.identity(res!9)
+    if Op.array_length(nodes) > 0:
+      for n <- nodes par:
+        on n:
+          try:
+            res <- Peer.timestamp_ms()
+      join res[9]
   <- res
 
 func ts_oracle(node: string, oracle_service_id: string, min_points:u32) -> Oracle:
   res <- ts_getter(node)
-  
   on node:
     TSOracle oracle_service_id
     oracle <- TSOracle.point_estimate(res, min_points)