Start using failure for error management

server/Cargo.lock

@@ -292,6 +292,26 @@ dependencies = [
  "backtrace 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "failure"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "backtrace 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure_derive 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "failure_derive"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 0.4.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "filetime"
 version = "0.2.4"
@@ -905,6 +925,7 @@ version = "0.5.0"
 dependencies = [
  "clap 2.32.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.5.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "notify 4.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1084,6 +1105,17 @@ dependencies = [
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "synstructure"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 0.4.24 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "tempdir"
 version = "0.3.7"
@@ -1414,6 +1446,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum encoding_index_tests 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "a246d82be1c9d791c5dfde9a2bd045fc3cbba3fa2b11ad558f27d01712f00569"
 "checksum env_logger 0.5.13 (registry+https://github.com/rust-lang/crates.io-index)" = "15b0a4d2e39f8420210be8b27eeda28029729e2fd4291019455016c348240c38"
 "checksum error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ff511d5dc435d703f4971bc399647c9bc38e20cb41452e3b9feb4765419ed3f3"
+"checksum failure 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "6dd377bcc1b1b7ce911967e3ec24fa19c3224394ec05b54aa7b083d498341ac7"
+"checksum failure_derive 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "64c2d913fe8ed3b6c6518eedf4538255b989945c14c2a7d5cbff62a5e2120596"
 "checksum filetime 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "a2df5c1a8c4be27e7707789dc42ae65976e60b394afd293d1419ab915833e646"
 "checksum fsevent 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)" = "c4bbbf71584aeed076100b5665ac14e3d85eeb31fdbb45fbd41ef9a682b5ec05"
 "checksum fsevent-sys 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "1a772d36c338d07a032d5375a36f15f9a7043bf0cb8ce7cee658e037c6032874"
@@ -1504,6 +1538,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum stable_deref_trait 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "dba1a27d3efae4351c8051072d619e3ade2820635c3958d826bfea39d59b54c8"
 "checksum strsim 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bb4f380125926a99e52bc279241539c018323fab05ad6368b56f93d9369ff550"
 "checksum syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)" = "ae8b29eb5210bc5cf63ed6149cbf9adfc82ac0be023d8735c176ee74a2db4da7"
+"checksum synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)" = "73687139bf99285483c96ac0add482c3776528beac1d97d444f6e91f203a2015"
 "checksum tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)" = "15f2b5fb00ccdf689e0149d1b1b3c03fead81c2b37735d812fa8bddbbf41b6d8"
 "checksum tempfile 3.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "7e91405c14320e5c79b3d148e1c86f40749a36e490642202a31689cb1a3452b2"
 "checksum term 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "5e6b677dd1e8214ea1ef4297f85dbcbed8e8cdddb561040cc998ca2551c37561"

server/Cargo.toml

@@ -30,10 +30,11 @@ rand = "0.4"
 regex = "1.0"
 log = "0.4"
 env_logger = "0.5"
+uuid = { version = "0.7", features = ["v4", "serde"] }
+failure = "0.1.3"
 rbx-tree = { git = "https://github.com/LPGhatguy/rbx-tree.git" }
 rbxmx = { git = "https://github.com/LPGhatguy/rbx-tree.git" }
 rbxm = { git = "https://github.com/LPGhatguy/rbx-tree.git" }
-uuid = { version = "0.7", features = ["v4", "serde"] }
 
 [dev-dependencies]
 tempfile = "3.0"

server/src/commands/build.rs

@@ -2,9 +2,10 @@ use std::{
     path::PathBuf,
     fs::File,
     io,
-    fmt,
 };
 
+use failure::Fail;
+
 use crate::{
     rbx_session::construct_oneoff_tree,
     project::{Project, ProjectLoadFuzzyError},
@@ -38,22 +39,16 @@ pub struct BuildOptions {
     pub output_kind: Option<OutputKind>,
 }
 
+#[derive(Debug, Fail)]
 pub enum BuildError {
+    #[fail(display = "Could not detect what kind of file to create")]
     UnknownOutputKind,
-    ProjectLoadError(ProjectLoadFuzzyError),
-    IoError(io::Error),
-}
 
-impl fmt::Display for BuildError {
+    #[fail(display = "Project load error: {}", _0)]
-    fn fmt(&self, output: &mut fmt::Formatter) -> fmt::Result {
+    ProjectLoadError(#[fail(cause)] ProjectLoadFuzzyError),
-        match self {
+
-            BuildError::UnknownOutputKind => {
+    #[fail(display = "IO error: {}", _0)]
-                write!(output, "Could not detect what kind of output file to create")
+    IoError(#[fail(cause)] io::Error),
-            },
-            BuildError::ProjectLoadError(inner) => write!(output, "{}", inner),
-            BuildError::IoError(inner) => write!(output, "{}", inner),
-        }
-    }
 }
 
 impl From<ProjectLoadFuzzyError> for BuildError {

server/src/project.rs

@@ -1,17 +1,16 @@
 use std::{
     collections::HashMap,
-    fmt,
     fs,
     io,
     path::{Path, PathBuf},
 };
 
-use serde_json;
+use failure::Fail;
 use rbx_tree::RbxValue;
 
 pub static PROJECT_FILENAME: &'static str = "roblox-project.json";
 
-// Serde is silly,
+// Serde is silly.
 const fn yeah() -> bool {
     true
 }
@@ -89,35 +88,25 @@ impl SourceProject {
     }
 }
 
-#[derive(Debug)]
+#[derive(Debug, Fail)]
 pub enum ProjectLoadExactError {
-    IoError(io::Error),
+    #[fail(display = "IO error: {}", _0)]
-    JsonError(serde_json::Error),
+    IoError(#[fail(cause)] io::Error),
+
+    #[fail(display = "JSON error: {}", _0)]
+    JsonError(#[fail(cause)] serde_json::Error),
 }
 
-impl fmt::Display for ProjectLoadExactError {
+#[derive(Debug, Fail)]
-    fn fmt(&self, output: &mut fmt::Formatter) -> fmt::Result {
-        match self {
-            ProjectLoadExactError::IoError(inner) => write!(output, "{}", inner),
-            ProjectLoadExactError::JsonError(inner) => write!(output, "{}", inner),
-        }
-    }
-}
-
-#[derive(Debug)]
-pub enum ProjectInitError {}
-
-impl fmt::Display for ProjectInitError {
-    fn fmt(&self, output: &mut fmt::Formatter) -> fmt::Result {
-        write!(output, "ProjectInitError")
-    }
-}
-
-#[derive(Debug)]
 pub enum ProjectLoadFuzzyError {
+    #[fail(display = "Project not found")]
     NotFound,
-    IoError(io::Error),
+
-    JsonError(serde_json::Error),
+    #[fail(display = "IO error: {}", _0)]
+    IoError(#[fail(cause)] io::Error),
+
+    #[fail(display = "JSON error: {}", _0)]
+    JsonError(#[fail(cause)] serde_json::Error),
 }
 
 impl From<ProjectLoadExactError> for ProjectLoadFuzzyError {
@@ -129,24 +118,13 @@ impl From<ProjectLoadExactError> for ProjectLoadFuzzyError {
     }
 }
 
-impl fmt::Display for ProjectLoadFuzzyError {
+#[derive(Debug, Fail)]
-    fn fmt(&self, output: &mut fmt::Formatter) -> fmt::Result {
+#[fail(display = "Project init error")]
-        match self {
+pub struct ProjectInitError;
-            ProjectLoadFuzzyError::NotFound => write!(output, "Project not found."),
-            ProjectLoadFuzzyError::IoError(inner) => write!(output, "{}", inner),
-            ProjectLoadFuzzyError::JsonError(inner) => write!(output, "{}", inner),
-        }
-    }
-}
 
-#[derive(Debug)]
+#[derive(Debug, Fail)]
-pub enum ProjectSaveError {}
+#[fail(display = "Project save error")]
-
+pub struct ProjectSaveError;
-impl fmt::Display for ProjectSaveError {
-    fn fmt(&self, output: &mut fmt::Formatter) -> fmt::Result {
-        write!(output, "ProjectSaveError")
-    }
-}
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(tag = "type")]