Use one error_chain definition

src/app.rs

@@ -11,7 +11,7 @@ use std::time::Duration;
 use daemon::Network;
 use {daemon, index, query, rpc, store};
 
-error_chain!{}
+use errors::*;
 
 #[derive(Debug)]
 struct Config {
@@ -83,7 +83,7 @@ impl App {
         &self.daemon
     }
     fn update_index(&self, mut tip: Sha256dHash) -> Result<Sha256dHash> {
-        if tip != self.daemon.getbestblockhash().chain_err(|| "daemon error")? {
+        if tip != self.daemon.getbestblockhash()? {
             tip = self.index.update(&self.store, &self.daemon);
         }
         Ok(tip)
@@ -92,7 +92,7 @@ impl App {
 
 fn run_server(config: &Config) -> Result<()> {
     let index = index::Index::new();
-    let daemon = daemon::Daemon::new(config.network_type).chain_err(|| "cannot connect to daemon")?;
+    let daemon = daemon::Daemon::new(config.network_type)?;
 
     let store = store::DBStore::open(
         config.db_path,
@@ -117,9 +117,7 @@ fn run_server(config: &Config) -> Result<()> {
     rpc::start(&config.rpc_addr, query.clone());
     loop {
         thread::sleep(poll_delay);
-        query
-            .update_mempool()
-            .chain_err(|| "mempool update failed")?;
+        query.update_mempool()?;
         tip = app.update_index(tip)?;
     }
 }

src/daemon.rs

@@ -13,7 +13,7 @@ use std::net::TcpStream;
 
 use util::{HeaderList, HeaderMap};
 
-error_chain!{}
+use errors::*;
 
 #[derive(Debug, Copy, Clone)]
 pub enum Network {

src/errors.rs

+error_chain!{
+    types {
+        Error, ErrorKind, ResultExt, Result;
+    }
+}

src/lib.rs

@@ -27,6 +27,7 @@ extern crate serde_json;
 
 pub mod app;
 mod daemon;
+mod errors;
 mod index;
 mod mempool;
 mod query;

src/mempool.rs

@@ -12,7 +12,7 @@ use index::index_transaction;
 use store::{ReadStore, Row};
 use util::Bytes;
 
-error_chain!{}
+use errors::*;
 
 const VSIZE_BIN_WIDTH: u32 = 100_000; // in vbytes
 

src/query.rs

@@ -13,7 +13,7 @@ use mempool::Tracker;
 use store::ReadStore;
 use util::{FullHash, HashPrefix, HeaderEntry};
 
-error_chain!{}
+use errors::*;
 
 struct FundingOutput {
     txn_id: Sha256dHash,
@@ -308,11 +308,7 @@ impl Query {
     }
 
     pub fn update_mempool(&self) -> Result<()> {
-        self.tracker
-            .write()
-            .unwrap()
-            .update(self.app.daemon())
-            .chain_err(|| "failed to update mempool")
+        self.tracker.write().unwrap().update(self.app.daemon())
     }
 
     /// Returns [vsize, fee_rate] pairs (measured in vbytes and satoshis).

src/rpc.rs

@@ -16,7 +16,7 @@ use std::time::Duration;
 use query::Query;
 use util::HeaderEntry;
 
-error_chain!{}
+use errors::*;
 
 // TODO: Sha256dHash should be a generic hash-container (since script hash is single SHA256)
 fn hash_from_value(val: Option<&Value>) -> Result<Sha256dHash> {