[ref] network: create SyncError

lib/core/network/Cargo.toml

@@ -14,6 +14,7 @@ dup-crypto = { path = "../../tools/crypto" }
 dubp-documents= { path = "../../tools/documents" }
 durs-module = { path = "../module" }
 durs-network-documents = { path = "../../tools/network-documents" }
+failure = "0.1.5"
 serde = "1.0.*"
 serde_derive = "1.0.*"
 serde_json = "1.0.*"

lib/core/network/lib.rs

@@ -35,6 +35,7 @@ use durs_module::*;
 use durs_network_documents::network_endpoint::ApiFeatures;
 use durs_network_documents::network_head::NetworkHead;
 use durs_network_documents::*;
+use failure::Fail;
 use std::fmt::Debug;
 use std::sync::mpsc;
 
@@ -60,7 +61,7 @@ pub trait NetworkModule<DC: DursConfTrait, M: ModuleMessage>: ApiModule<DC, M> {
         module_conf: <Self as DursModule<DC, M>>::ModuleConf,
         main_sender: mpsc::Sender<RouterThreadMessage<M>>,
         sync_params: SyncOpt,
-    ) -> Result<(), ModuleInitError>;
+    ) -> Result<(), SyncError>;
 }
 
 /// Trait to be implemented by the configuration object of the module managing the inter-node network.
@@ -74,3 +75,20 @@ pub enum NetworkConsensusError {
     /// The network module does not determine consensus, there is most likely a fork
     Fork(),
 }
+
+#[derive(Debug, Clone, Fail, PartialEq, Eq, Hash)]
+/// Synchronization error
+pub enum SyncError {
+    /// Invalid source
+    #[fail(display = "invalid source: {}", source)]
+    InvalidSource {
+        /// Source
+        source: String,
+    },
+    /// Unreachable source
+    #[fail(display = "unreachable source: {}", source)]
+    UnreachableSource {
+        /// Source
+        source: String,
+    },
+}

lib/modules/ws2p/ws2p/src/lib.rs

@@ -130,7 +130,7 @@ impl NetworkModule<DuRsConf, DursMsg> for WS2PModule {
         _conf: WS2PConf,
         _main_sender: mpsc::Sender<RouterThreadMessage<DursMsg>>,
         _sync_params: SyncOpt,
-    ) -> Result<(), ModuleInitError> {
+    ) -> Result<(), SyncError> {
         unimplemented!()
     }
 }