Remove itertools dependency

Cargo.toml

@@ -12,7 +12,6 @@ bitcoin = "0.13"
 crossbeam = "0.3.2"
 error-chain = "0.11"
 hex = "0.3"
-itertools = "0.7.8"
 log = "0.4"
 pbr = "1.0.0"
 rocksdb = "0.10.0"

src/lib.rs

@@ -6,7 +6,6 @@ extern crate bitcoin;
 extern crate crossbeam;
 extern crate crypto;
 extern crate hex;
-extern crate itertools;
 extern crate pbr;
 extern crate rocksdb;
 extern crate serde;

src/query.rs

@@ -4,7 +4,6 @@ use bitcoin::network::serialize::deserialize;
 use bitcoin::util::hash::Sha256dHash;
 use crypto::digest::Digest;
 use crypto::sha2::Sha256;
-use itertools::enumerate;
 use std::collections::HashMap;
 use std::sync::RwLock;
 
@@ -155,7 +154,7 @@ impl<'a> Query<'a> {
         ));
         let mut spending_inputs = Vec::new();
         for t in &spending_txns {
-            for (index, input) in enumerate(&t.txn.input) {
+            for (index, input) in t.txn.input.iter().enumerate() {
                 if input.prev_hash == funding.txn_id
                     && input.prev_index == funding.output_index as u32
                 {
@@ -178,7 +177,7 @@ impl<'a> Query<'a> {
     fn find_funding_outputs(&self, t: &TxnHeight, script_hash: &[u8]) -> Vec<FundingOutput> {
         let mut result = Vec::new();
         let txn_id = t.txn.txid();
-        for (index, output) in enumerate(&t.txn.output) {
+        for (index, output) in t.txn.output.iter().enumerate() {
             if compute_script_hash(&output.script_pubkey[..]) == script_hash {
                 result.push(FundingOutput {
                     txn_id: txn_id,

src/rpc.rs

@@ -4,7 +4,6 @@ use bitcoin::network::serialize::{deserialize, serialize};
 use bitcoin::util::hash::Sha256dHash;
 use crossbeam;
 use hex;
-use itertools;
 use serde_json::{from_str, Number, Value};
 use std::collections::HashMap;
 use std::io::{BufRead, BufReader, Write};
@@ -87,14 +86,12 @@ impl<'a> Connection<'a> {
         let index = params.get(0).chain_err(|| "missing index")?;
         let index = index.as_u64().chain_err(|| "non-number index")? as usize;
         let heights: Vec<usize> = (0..CHUNK_SIZE).map(|h| index * CHUNK_SIZE + h).collect();
-        let headers = self.query.get_headers(&heights);
-        let result = itertools::join(
-            headers
-                .into_iter()
-                .map(|x| hex::encode(&serialize(&x).unwrap())),
-            "",
-        );
-        Ok(json!(result))
+        let headers: Vec<String> = self.query
+            .get_headers(&heights)
+            .into_iter()
+            .map(|x| hex::encode(&serialize(&x).unwrap()))
+            .collect();
+        Ok(json!(headers.join("")))
     }
 
     fn blockchain_block_get_header(&self, params: &[Value]) -> Result<Value> {