network prune client side approach

Author: saehejkang

Sources/ContainerCommands/Network/NetworkPrune.swift

@@ -30,9 +30,36 @@ extension Application.NetworkCommand {
         var global: Flags.Global
 
         public func run() async throws {
-            let networkNames = try await ClientNetwork.prune()
+            let allContainers = try await ClientContainer.list()
+            let allNetworks = try await ClientNetwork.list()
 
-            for name in networkNames {
+            var networksInUse = Set<String>()
+            for container in allContainers {
+                for network in container.configuration.networks {
+                    networksInUse.insert(network.network)
+                }
+            }
+
+            let networksToPrune = allNetworks.filter { network in
+                network.id != ClientNetwork.defaultNetworkName && !networksInUse.contains(network.id)
+            }
+
+            var prunedNetworks = [String]()
+
+            for network in networksToPrune {
+                do {
+                    try await ClientNetwork.delete(id: network.id)
+                    prunedNetworks.append(network.id)
+                    log.info("Pruned network", metadata: ["name": "\(network.id)"])
+                } catch {
+                    // Note: This failure may occur due to a race condition between the network/
+                    // container collection above and a container run command that attaches to a
+                    // network listed in the networksToPrune collection.
+                    log.error("Failed to prune network \(network.id): \(error)")
+                }
+            }
+
+            for name in prunedNetworks {
                 print(name)
             }
         }