From bdecba1a676a0441c08f01a4162dcdac008b1ec1 Mon Sep 17 00:00:00 2001
From: kyzooghost <jeffersonzjtang@gmail.com>
Date: Sat, 28 Sep 2024 20:15:27 +1000
Subject: [PATCH] refactor path struct out of graph.rs, add request_handler
 module

---
 Cargo.lock                                    | 2750 ++---------------
 Cargo.toml                                    |    3 +-
 README.md                                     |   22 +-
 app/src/main.rs                               |    9 +-
 arbitrage_engine/src/graph.rs                 |  155 +-
 arbitrage_engine/src/lib.rs                   |    3 +-
 arbitrage_engine/src/path.rs                  |  143 +
 petgraph-tute.md                              |   17 +
 request_handler/request_handler/Cargo.toml    |    8 +
 .../request_handler/src/interface.rs          |   23 +
 request_handler/request_handler/src/lib.rs    |   14 +
 11 files changed, 422 insertions(+), 2725 deletions(-)
 create mode 100644 arbitrage_engine/src/path.rs
 create mode 100644 petgraph-tute.md
 create mode 100644 request_handler/request_handler/Cargo.toml
 create mode 100644 request_handler/request_handler/src/interface.rs
 create mode 100644 request_handler/request_handler/src/lib.rs

diff --git a/Cargo.lock b/Cargo.lock
index a8f4baa..787a96b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,2661 +2,336 @@
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-checksum = "a45526d29728d135c2900b0d30573fe3ee79fceb12ef534c7bb30e810a91b601"
+checksum = "10a35a97730320ffe8e2d410b5d3b69279b98d2c14bdb8b70ea89ecf7888d41e"
 dependencies = [
- "byteorder",
- "crunchy",
- "hex",
- "static_assertions",
+ "autocfg",
+ "hashbrown",
 ]
 
 [[package]]
-name = "unicode-bidi"
-version = "0.3.8"
+name = "lazy_static"
+version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "099b7128301d285f79ddd55b9a83d5e6b9e97c92e0ea0daebee7263e932de992"
+checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
-name = "unicode-ident"
-version = "1.0.5"
+name = "libc"
+version = "0.2.137"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6ceab39d59e4c9499d4e5a8ee0e2735b891bb7308ac83dfb4e80cad195c9f6f3"
+checksum = "fc7fcc620a3bff7cdd7a365be3376c97191aeaccc2a603e600951e452615bf89"
 
 [[package]]
-name = "unicode-normalization"
-version = "0.1.22"
+name = "lock_api"
+version = "0.4.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5c5713f0fc4b5db668a2ac63cdb7bb4469d8c9fed047b1d0292cc7b0ce2ba921"
+checksum = "435011366fe56583b16cf956f9df0095b405b82d76425bc8981c0e22e60ec4df"
 dependencies = [
- "tinyvec",
+ "autocfg",
+ "scopeguard",
 ]
 
 [[package]]
-name = "unicode-segmentation"
-version = "1.10.0"
+name = "log"
+version = "0.4.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0fdbf052a0783de01e944a6ce7a8cb939e295b1e7be835a1112c3b9a7f047a5a"
+checksum = "abb12e687cfb44aa40f41fc3978ef76448f9b6038cad6aef4259d3c095a2382e"
+dependencies = [
+ "cfg-if",
+]
 
 [[package]]
-name = "unicode-xid"
-version = "0.2.4"
+name = "memchr"
+version = "2.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f962df74c8c05a667b5ee8bcf162993134c104e96440b663c8daa176dc772d8c"
+checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
 
 [[package]]
-name = "untrusted"
-version = "0.7.1"
+name = "mio"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a156c684c91ea7d62626509bce3cb4e1d9ed5c4d978f7b4352658f96a4c26b4a"
+checksum = "e5d732bc30207a6423068df043e3d02e0735b155ad7ce1a6f76fe2baa5b158de"
+dependencies = [
+ "libc",
+ "log",
+ "wasi",
+ "windows-sys",
+]
 
 [[package]]
-name = "url"
-version = "2.3.1"
+name = "num_cpus"
+version = "1.13.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0d68c799ae75762b8c3fe375feb6600ef5602c883c5d21eb51c09f22b83c4643"
+checksum = "19e64526ebdee182341572e50e9ad03965aa510cd94427a4549448f285e957a1"
 dependencies = [
- "form_urlencoded",
- "idna",
- "percent-encoding",
+ "hermit-abi",
+ "libc",
 ]
 
 [[package]]
-name = "uuid"
-version = "0.8.2"
+name = "once_cell"
+version = "1.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bc5cf98d8186244414c848017f0e2676b3fcb46807f6668a97dfe67359a3c4b7"
-dependencies = [
- "getrandom",
- "serde",
-]
+checksum = "86f0b0d4bf799edbc74508c1e8bf170ff5f41238e5f8225603ca7caaae2b7860"
 
 [[package]]
-name = "version_check"
-version = "0.9.4"
+name = "parking_lot"
+version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
+checksum = "3742b2c103b9f06bc9fff0a37ff4912935851bee6d36f3c02bcc755bcfec228f"
+dependencies = [
+ "lock_api",
+ "parking_lot_core",
+]
 
 [[package]]
-name = "walkdir"
-version = "2.3.2"
+name = "parking_lot_core"
+version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "808cf2735cd4b6866113f648b791c6adc5714537bc222d9347bb203386ffda56"
+checksum = "4dc9e0dc2adc1c69d09143aff38d3d30c5c3f0df0dad82e6d25547af174ebec0"
 dependencies = [
- "same-file",
- "winapi",
- "winapi-util",
+ "cfg-if",
+ "libc",
+ "redox_syscall",
+ "smallvec",
+ "windows-sys",
 ]
 
 [[package]]
-name = "want"
-version = "0.3.0"
+name = "petgraph"
+version = "0.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1ce8a968cb1cd110d136ff8b819a556d6fb6d919363c61534f6860c7eb172ba0"
+checksum = "e6d5014253a1331579ce62aa67443b4a658c5e7dd03d4bc6d302b94474888143"
 dependencies = [
- "log",
- "try-lock",
+ "fixedbitset",
+ "indexmap",
 ]
 
 [[package]]
-name = "wasi"
-version = "0.11.0+wasi-snapshot-preview1"
+name = "pin-project-lite"
+version = "0.2.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
+checksum = "e0a7ae3ac2f1173085d398531c705756c94a4c56843785df85a60c1a0afac116"
 
 [[package]]
-name = "wasm-bindgen"
-version = "0.2.83"
+name = "proc-macro2"
+version = "1.0.47"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eaf9f5aceeec8be17c128b2e93e031fb8a4d469bb9c4ae2d7dc1888b26887268"
+checksum = "5ea3d908b0e36316caf9e9e2c4625cdde190a7e6f440d794667ed17a1855e725"
 dependencies = [
- "cfg-if",
- "wasm-bindgen-macro",
+ "unicode-ident",
 ]
 
 [[package]]
-name = "wasm-bindgen-backend"
-version = "0.2.83"
+name = "quote"
+version = "1.0.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4c8ffb332579b0557b52d268b91feab8df3615f265d5270fec2a8c95b17c1142"
+checksum = "bbe448f377a7d6961e30f5955f9b8d106c3f5e449d493ee1b125c1d43c2b5179"
 dependencies = [
- "bumpalo",
- "log",
- "once_cell",
  "proc-macro2",
- "quote",
- "syn",
- "wasm-bindgen-shared",
 ]
 
 [[package]]
-name = "wasm-bindgen-futures"
-version = "0.4.33"
+name = "redox_syscall"
+version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "23639446165ca5a5de86ae1d8896b737ae80319560fbaa4c2887b7da6e7ebd7d"
+checksum = "fb5a58c1855b4b6819d59012155603f0b22ad30cad752600aadfcb695265519a"
 dependencies = [
- "cfg-if",
- "js-sys",
- "wasm-bindgen",
- "web-sys",
+ "bitflags",
 ]
 
 [[package]]
-name = "wasm-bindgen-macro"
-version = "0.2.83"
+name = "request_handler"
+version = "0.1.0"
+
+[[package]]
+name = "scopeguard"
+version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "052be0f94026e6cbc75cdefc9bae13fd6052cdcaf532fa6c45e7ae33a1e6c810"
-dependencies = [
- "quote",
- "wasm-bindgen-macro-support",
-]
+checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
 
 [[package]]
-name = "wasm-bindgen-macro-support"
-version = "0.2.83"
+name = "signal-hook-registry"
+version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "07bc0c051dc5f23e307b13285f9d75df86bfdf816c5721e573dec1f9b8aa193c"
+checksum = "e51e73328dc4ac0c7ccbda3a494dfa03df1de2f46018127f60c693f2648455b0"
 dependencies = [
- "proc-macro2",
- "quote",
- "syn",
- "wasm-bindgen-backend",
- "wasm-bindgen-shared",
+ "libc",
 ]
 
 [[package]]
-name = "wasm-bindgen-shared"
-version = "0.2.83"
+name = "smallvec"
+version = "1.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1c38c045535d93ec4f0b4defec448e4291638ee608530863b1e2ba115d4fff7f"
+checksum = "a507befe795404456341dfab10cef66ead4c041f62b8b11bbb92bffe5d0953e0"
 
 [[package]]
-name = "wasm-timer"
-version = "0.2.5"
+name = "socket2"
+version = "0.4.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "be0ecb0db480561e9a7642b5d3e4187c128914e58aa84330b9493e3eb68c5e7f"
+checksum = "02e2d2db9033d13a1567121ddd7a095ee144db4e1ca1b1bda3419bc0da294ebd"
 dependencies = [
- "futures",
- "js-sys",
- "parking_lot 0.11.2",
- "pin-utils",
- "wasm-bindgen",
- "wasm-bindgen-futures",
- "web-sys",
+ "libc",
+ "winapi",
 ]
 
 [[package]]
-name = "web-sys"
-version = "0.3.60"
+name = "syn"
+version = "1.0.103"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bcda906d8be16e728fd5adc5b729afad4e444e106ab28cd1c7256e54fa61510f"
+checksum = "a864042229133ada95abf3b54fdc62ef5ccabe9515b64717bcb9a1919e59445d"
 dependencies = [
- "js-sys",
- "wasm-bindgen",
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
 ]
 
 [[package]]
-name = "webpki"
-version = "0.22.0"
+name = "tokio"
+version = "1.21.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f095d78192e208183081cc07bc5515ef55216397af48b873e5edcd72637fa1bd"
+checksum = "a9e03c497dc955702ba729190dc4aac6f2a0ce97f913e5b1b5912fc5039d9099"
 dependencies = [
- "ring",
- "untrusted",
+ "autocfg",
+ "bytes",
+ "libc",
+ "memchr",
+ "mio",
+ "num_cpus",
+ "parking_lot",
+ "pin-project-lite",
+ "signal-hook-registry",
+ "socket2",
+ "tokio-macros",
+ "winapi",
 ]
 
 [[package]]
-name = "webpki-roots"
-version = "0.22.5"
+name = "tokio-macros"
+version = "1.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "368bfe657969fb01238bb756d351dcade285e0f6fcbd36dcb23359a5169975be"
+checksum = "9724f9a975fb987ef7a3cd9be0350edcbe130698af5b8f7a631e23d42d052484"
 dependencies = [
- "webpki",
+ "proc-macro2",
+ "quote",
+ "syn",
 ]
 
+[[package]]
+name = "unicode-ident"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6ceab39d59e4c9499d4e5a8ee0e2735b891bb7308ac83dfb4e80cad195c9f6f3"
+
+[[package]]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
+
 [[package]]
 name = "winapi"
 version = "0.3.9"
@@ -2673,15 +348,6 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
 
-[[package]]
-name = "winapi-util"
-version = "0.1.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
-dependencies = [
- "winapi",
-]
-
 [[package]]
 name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
@@ -2744,45 +410,3 @@ name = "windows_x86_64_msvc"
 version = "0.42.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f40009d85759725a34da6d89a94e63d7bdc50a862acf0dbc7c8e488f1edcb6f5"
-
-[[package]]
-name = "winreg"
-version = "0.10.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "80d0f4e272c85def139476380b12f9ac60926689dd2e01d4923222f40580869d"
-dependencies = [
- "winapi",
-]
-
-[[package]]
-name = "ws_stream_wasm"
-version = "0.7.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "47ca1ab42f5afed7fc332b22b6e932ca5414b209465412c8cdf0ad23bc0de645"
-dependencies = [
- "async_io_stream",
- "futures",
- "js-sys",
- "pharos",
- "rustc_version",
- "send_wrapper",
- "thiserror",
- "wasm-bindgen",
- "wasm-bindgen-futures",
- "web-sys",
-]
-
-[[package]]
-name = "wyz"
-version = "0.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "30b31594f29d27036c383b53b59ed3476874d518f0efb151b27a4c275141390e"
-dependencies = [
- "tap",
-]
-
-[[package]]
-name = "zeroize"
-version = "1.5.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c394b5bd0c6f669e7275d9c20aa90ae064cb22e75a1cad54e1b34088034b149f"
diff --git a/Cargo.toml b/Cargo.toml
index 0874844..f0ed5e9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,5 @@
 [workspace]
 members = [
-    "adaptors",
     "app",
     "arbitrage_engine"
-]
\ No newline at end of file
+, "request_handler/request_handler"]
diff --git a/README.md b/README.md
index 5a76364..61ead30 100644
--- a/README.md
+++ b/README.md
@@ -4,10 +4,28 @@ WIP.
 
 Modules
 - Core arbitrage engine
-- Adaptors for each network and protocol
+- (Deprecated) Adaptors for each network and protocol
 
-Useful CLI commands
+# Goal
 
+Hold graph data structure in memory. Receive messages from another program to
+i.) Update graph data structure
+ii.) Run arbitrage-scan algorithm on in-memory data structure, return discovered arbitrages
+
+Can model as request-response endpoints
+
+API:
+- add_node<T, T>
+- add_edge<T, f64>(T, T, f64)
+- get_negative_cycle_quick
+
+# TODO
+
+Loop in main.rs that waits on messages from another process
+Handler for external process messages
+-> API for arbitrage_engine
+
+# CLI commands
 
 Run unit tests without silencing stdout
 
diff --git a/app/src/main.rs b/app/src/main.rs
index 48804a9..ef5d12c 100644
--- a/app/src/main.rs
+++ b/app/src/main.rs
@@ -6,9 +6,10 @@ use eyre::Result;
 #[tokio::main]
 async fn main() -> Result<()> {
     println!("Hello, world");
-    // let mut a: Vec<Vec<usize>> = Vec::new();
-    // a.push(Vec::new());
-    // println!("{:?}", a[0]);
-    // println!("{:?}", a[1]);
+
+    // TODO - Set up loop that listens for messages from external process
+    // external_request_handler component, with interface and specific implementation
+    // external_request_handler.listen
+
     Ok(())
 }
\ No newline at end of file
diff --git a/arbitrage_engine/src/graph.rs b/arbitrage_engine/src/graph.rs
index eb0f522..a944e0d 100644
--- a/arbitrage_engine/src/graph.rs
+++ b/arbitrage_engine/src/graph.rs
@@ -11,170 +11,19 @@ mod graph_mod {
     };
 
     use super::super::utils::logger::{logObject, logText};
-
-    #[test]
-    fn petgraph_basic_methods() {
-        let mut graph: Graph<&str, f64> = Graph::new();
-        let origin = graph.add_node("Denver");
-        let destination_1 = graph.add_node("San Diego");
-        let destination_2 = graph.add_node("New York");
-        let cost_1 = graph.add_edge(origin, destination_1, 250.0);
-        let cost_2 = graph.add_edge(origin, destination_2, 1099.0);
-        assert_eq!(graph.node_weight(origin).unwrap(), &"Denver");
-        assert_eq!(graph[destination_1], "San Diego");
-        assert_eq!(graph.edge_weight(cost_1).unwrap(), &250.0);
-        assert_eq!(graph.edge_weight(cost_2).unwrap(), &1099.0);
-        *graph.edge_weight_mut(cost_1).unwrap() = 249.0;
-        assert_eq!(graph.edge_weight(cost_1).unwrap(), &249.0);
-    }
-
-    pub mod path {
-        use super::{EdgeIndex, Graph, NodeIndex};
-        use std::{
-            marker::PhantomData,
-            cmp::Ordering
-        };
-
-        // Choosing to store vector of indexes, rather than using a recursive type as we did in Java. Should be ok if the vectors don't grow too large.
-        #[derive(Debug)]
-        pub struct Path<N: Clone> {
-            weight: f64,
-            edges: Vec<EdgeIndex>,
-            nodes: Vec<NodeIndex>,
-            node_type: PhantomData<N>,
-        }
-
-        impl<N: Clone> Path<N> {
-            pub fn new(source_node: NodeIndex) -> Self {
-                Path {
-                    weight: 0.0_f64,
-                    edges: Vec::new(),
-                    nodes: vec![source_node],
-                    node_type: PhantomData,
-                }
-            }
-
-            pub fn add_to_path(&mut self, graph: &Graph<N, f64>, edge: EdgeIndex) {
-                assert_eq!(
-                    &graph.edge_endpoints(edge).unwrap().0,
-                    self.nodes.last().unwrap(),
-                    "Edge does not extend from existing path"
-                );
-                self.weight += graph.edge_weight(edge).unwrap();
-                self.edges.push(edge);
-                self.nodes.push(graph.edge_endpoints(edge).unwrap().1);
-            }
-
-            pub fn weight(&self) -> f64 {
-                self.weight
-            }
-
-            pub fn edges(&self) -> Vec<EdgeIndex> {
-                let mut vec: Vec<EdgeIndex> = Vec::new();
-                for edge in self.edges.iter() {
-                    vec.push(*edge);
-                }
-                vec
-            }
-
-            pub fn nodes(&self) -> Vec<NodeIndex> {
-                let mut vec: Vec<NodeIndex> = Vec::new();
-                for node in self.nodes.iter() {
-                    vec.push(*node);
-                }
-                vec
-            }
-
-            pub fn length(&self) -> usize {
-                self.nodes.len()
-            }
-        }
-
-        impl<N: Clone> PartialEq for Path<N> {
-            fn eq(&self, other: &Self) -> bool {
-                self.weight.to_bits() == other.weight.to_bits()
-            }
-        }
-
-        impl<N: Clone> Eq for Path<N> {}
-
-        impl<N: Clone> PartialOrd for Path<N> {
-            fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
-                Some(self.cmp(other))
-            }
-        }
-
-        impl<N: Clone> Ord for Path<N> {
-            fn cmp(&self, other: &Self) -> Ordering {
-                if self.weight < other.weight {
-                    Ordering::Less
-                } else if self.weight > other.weight {
-                    Ordering::Greater
-                } else {
-                    Ordering::Equal
-                }
-            }
-        }
-
-        #[test]
-        fn path_basic_methods() {
-            // Build graph
-            let mut graph: Graph<&str, f64> = Graph::new();
-            let origin = graph.add_node("Denver");
-            let destination_1 = graph.add_node("San Diego");
-            let destination_2 = graph.add_node("New York");
-            let cost_1 = graph.add_edge(origin, destination_1, 250.0);
-            let cost_2 = graph.add_edge(origin, destination_2, 1099.0);
-
-            // Create path
-            let mut path: Path<&str> = Path::new(origin);
-            assert_eq!(path.weight(), 0.0);
-            assert_eq!(path.length(), 1);
-            assert_eq!(path.edges().len(), 0);
-            assert_eq!(path.nodes().len(), 1);
-            assert_eq!(path.nodes()[0], origin);
-
-            // Add to path
-            path.add_to_path(&graph, cost_1);
-            assert_eq!(path.weight(), 250.0);
-            assert_eq!(path.length(), 2);
-            assert_eq!(path.edges().len(), 1);
-            assert_eq!(path.nodes().len(), 2);
-            assert_eq!(path.nodes()[0], origin);
-            assert_eq!(path.nodes()[1], destination_1);
-            assert_eq!(path.edges()[0], cost_1);
-
-            // Create another path
-            let mut path1: Path<&str> = Path::new(origin);
-            assert_eq!(path1.weight(), 0.0);
-            assert_eq!(path1.length(), 1);
-            assert_eq!(path1.edges().len(), 0);
-            assert_eq!(path1.nodes().len(), 1);
-            assert_eq!(path1.nodes()[0], origin);
-
-            // Add to another path
-            path1.add_to_path(&graph, cost_2);
-            assert_eq!(path1.weight(), 1099.0);
-            assert_eq!(path1.length(), 2);
-            assert_eq!(path1.edges().len(), 1);
-            assert_eq!(path1.nodes().len(), 2);
-            assert_eq!(path1.nodes()[0], origin);
-            assert_eq!(path1.nodes()[1], destination_2);
-            assert_eq!(path1.edges()[0], cost_2);
-        }
-    }
+    use super::super::path::path::Path;
 
     pub mod cycle {
         use super::{
             logObject, 
             logText, 
-            path::Path, 
             EdgeIndex, 
             EdgeRef, 
             EdgeReference,
             Graph, 
             NodeIndex, 
             Outgoing,
+            Path
         };
 
         use std::{
diff --git a/arbitrage_engine/src/lib.rs b/arbitrage_engine/src/lib.rs
index 0fe24b5..abec6e6 100644
--- a/arbitrage_engine/src/lib.rs
+++ b/arbitrage_engine/src/lib.rs
@@ -1,2 +1,3 @@
 pub mod graph;
-pub mod utils;
\ No newline at end of file
+pub mod utils;
+pub mod path;
\ No newline at end of file
diff --git a/arbitrage_engine/src/path.rs b/arbitrage_engine/src/path.rs
new file mode 100644
index 0000000..cdb1916
--- /dev/null
+++ b/arbitrage_engine/src/path.rs
@@ -0,0 +1,143 @@
+pub use path_mod::*;
+
+mod path_mod {
+    pub mod path {
+        use petgraph::{
+            graph::Graph,
+            prelude::{EdgeIndex, NodeIndex},
+        };
+        
+        use std::{
+            marker::PhantomData,
+            cmp::Ordering
+        };
+
+        // Choosing to store vector of indexes, rather than using a recursive type as we did in Java. Should be ok if the vectors don't grow too large.
+        #[derive(Debug)]
+        pub struct Path<N: Clone> {
+            weight: f64,
+            edges: Vec<EdgeIndex>,
+            nodes: Vec<NodeIndex>,
+            node_type: PhantomData<N>,
+        }
+
+        impl<N: Clone> Path<N> {
+            pub fn new(source_node: NodeIndex) -> Self {
+                Path {
+                    weight: 0.0_f64,
+                    edges: Vec::new(),
+                    nodes: vec![source_node],
+                    node_type: PhantomData,
+                }
+            }
+
+            pub fn add_to_path(&mut self, graph: &Graph<N, f64>, edge: EdgeIndex) {
+                assert_eq!(
+                    &graph.edge_endpoints(edge).unwrap().0,
+                    self.nodes.last().unwrap(),
+                    "Edge does not extend from existing path"
+                );
+                self.weight += graph.edge_weight(edge).unwrap();
+                self.edges.push(edge);
+                self.nodes.push(graph.edge_endpoints(edge).unwrap().1);
+            }
+
+            pub fn weight(&self) -> f64 {
+                self.weight
+            }
+
+            pub fn edges(&self) -> Vec<EdgeIndex> {
+                let mut vec: Vec<EdgeIndex> = Vec::new();
+                for edge in self.edges.iter() {
+                    vec.push(*edge);
+                }
+                vec
+            }
+
+            pub fn nodes(&self) -> Vec<NodeIndex> {
+                let mut vec: Vec<NodeIndex> = Vec::new();
+                for node in self.nodes.iter() {
+                    vec.push(*node);
+                }
+                vec
+            }
+
+            pub fn length(&self) -> usize {
+                self.nodes.len()
+            }
+        }
+
+        impl<N: Clone> PartialEq for Path<N> {
+            fn eq(&self, other: &Self) -> bool {
+                self.weight.to_bits() == other.weight.to_bits()
+            }
+        }
+
+        impl<N: Clone> Eq for Path<N> {}
+
+        impl<N: Clone> PartialOrd for Path<N> {
+            fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+                Some(self.cmp(other))
+            }
+        }
+
+        impl<N: Clone> Ord for Path<N> {
+            fn cmp(&self, other: &Self) -> Ordering {
+                if self.weight < other.weight {
+                    Ordering::Less
+                } else if self.weight > other.weight {
+                    Ordering::Greater
+                } else {
+                    Ordering::Equal
+                }
+            }
+        }
+
+        #[test]
+        fn path_basic_methods() {
+            // Build graph
+            let mut graph: Graph<&str, f64> = Graph::new();
+            let origin = graph.add_node("Denver");
+            let destination_1 = graph.add_node("San Diego");
+            let destination_2 = graph.add_node("New York");
+            let cost_1 = graph.add_edge(origin, destination_1, 250.0);
+            let cost_2 = graph.add_edge(origin, destination_2, 1099.0);
+
+            // Create path
+            let mut path: Path<&str> = Path::new(origin);
+            assert_eq!(path.weight(), 0.0);
+            assert_eq!(path.length(), 1);
+            assert_eq!(path.edges().len(), 0);
+            assert_eq!(path.nodes().len(), 1);
+            assert_eq!(path.nodes()[0], origin);
+
+            // Add to path
+            path.add_to_path(&graph, cost_1);
+            assert_eq!(path.weight(), 250.0);
+            assert_eq!(path.length(), 2);
+            assert_eq!(path.edges().len(), 1);
+            assert_eq!(path.nodes().len(), 2);
+            assert_eq!(path.nodes()[0], origin);
+            assert_eq!(path.nodes()[1], destination_1);
+            assert_eq!(path.edges()[0], cost_1);
+
+            // Create another path
+            let mut path1: Path<&str> = Path::new(origin);
+            assert_eq!(path1.weight(), 0.0);
+            assert_eq!(path1.length(), 1);
+            assert_eq!(path1.edges().len(), 0);
+            assert_eq!(path1.nodes().len(), 1);
+            assert_eq!(path1.nodes()[0], origin);
+
+            // Add to another path
+            path1.add_to_path(&graph, cost_2);
+            assert_eq!(path1.weight(), 1099.0);
+            assert_eq!(path1.length(), 2);
+            assert_eq!(path1.edges().len(), 1);
+            assert_eq!(path1.nodes().len(), 2);
+            assert_eq!(path1.nodes()[0], origin);
+            assert_eq!(path1.nodes()[1], destination_2);
+            assert_eq!(path1.edges()[0], cost_2);
+        }
+    }
+}
diff --git a/petgraph-tute.md b/petgraph-tute.md
new file mode 100644
index 0000000..ea2fad3
--- /dev/null
+++ b/petgraph-tute.md
@@ -0,0 +1,17 @@
+```rust
+#[test]
+fn petgraph_basic_methods() {
+    let mut graph: Graph<&str, f64> = Graph::new();
+    let origin = graph.add_node("Denver");
+    let destination_1 = graph.add_node("San Diego");
+    let destination_2 = graph.add_node("New York");
+    let cost_1 = graph.add_edge(origin, destination_1, 250.0);
+    let cost_2 = graph.add_edge(origin, destination_2, 1099.0);
+    assert_eq!(graph.node_weight(origin).unwrap(), &"Denver");
+    assert_eq!(graph[destination_1], "San Diego");
+    assert_eq!(graph.edge_weight(cost_1).unwrap(), &250.0);
+    assert_eq!(graph.edge_weight(cost_2).unwrap(), &1099.0);
+    *graph.edge_weight_mut(cost_1).unwrap() = 249.0;
+    assert_eq!(graph.edge_weight(cost_1).unwrap(), &249.0);
+}
+```
\ No newline at end of file
diff --git a/request_handler/request_handler/Cargo.toml b/request_handler/request_handler/Cargo.toml
new file mode 100644
index 0000000..595257a
--- /dev/null
+++ b/request_handler/request_handler/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "request_handler"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/request_handler/request_handler/src/interface.rs b/request_handler/request_handler/src/interface.rs
new file mode 100644
index 0000000..d3ff9e3
--- /dev/null
+++ b/request_handler/request_handler/src/interface.rs
@@ -0,0 +1,23 @@
+// TODO - How to serialize and deserialize message to find appropriate message handler?
+
+// TODO - Need to add metadata to the path, not just exchange rate but protocol + blockchain
+struct ArbitrageResult {
+
+    // time
+    // array of results
+    // 
+}
+
+trait RequestHandler {
+    // Start server to listen for messages from external processes
+    fn listen_and_serve(&self);
+
+    // Update graph data structure
+    // Up to the client to provide unique string ID for nodes
+    // add_node if not present
+    // Will add bidrectional edge between n0 and n1
+    // True if graph updated, False if not (not more 'extreme' than existing edges)
+    fn upsert_path(&self, n0: &str, n1: &str, n0_to_n1_rate: f64) -> bool;
+
+    // fn scan_arbitrages(&self) 
+}
\ No newline at end of file
diff --git a/request_handler/request_handler/src/lib.rs b/request_handler/request_handler/src/lib.rs
new file mode 100644
index 0000000..7d12d9a
--- /dev/null
+++ b/request_handler/request_handler/src/lib.rs
@@ -0,0 +1,14 @@
+pub fn add(left: usize, right: usize) -> usize {
+    left + right
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        let result = add(2, 2);
+        assert_eq!(result, 4);
+    }
+}