Fix #22: Fix 'unknown variant' failures

Only keep used GitHub enums and set a default value for unused ones.

Use tip from documentation:
https://serde.rs/attr-default.html

This tip has been given by @dtolnay in this issue:
serde-rs/serde#1353

src/github_events/mod.rs

@@ -5,6 +5,7 @@ extern crate serde_json;
 use self::reqwest::StatusCode;
 use chrono::{DateTime, Utc};
 use regex::Regex;
+use serde::{Deserialize, Deserializer};
 use std::io::{Error, ErrorKind};
 use std::str;
 
@@ -112,7 +113,9 @@ fn last_page_from_link_header(link_header: &str) -> Option<u32> {
 pub struct RawEvent {
     pub actor: Actor,
     pub payload: Payload,
-    #[serde(rename = "type")]
+    #[serde(
+        rename = "type", deserialize_with = "deserialize_field_type", default = "Type::default"
+    )]
     pub event_type: Type,
     pub created_at: DateTime<Utc>,
 }
@@ -124,7 +127,8 @@ pub struct Actor {
 
 #[derive(Debug, Deserialize, Eq, PartialEq)]
 pub struct Payload {
-    pub action: Option<Action>,
+    #[serde(deserialize_with = "deserialize_field_action", default = "Action::default")]
+    pub action: Action,
 }
 
 #[derive(Debug, Deserialize, Eq, PartialEq)]
@@ -134,52 +138,42 @@ pub enum Action {
     #[allow(non_camel_case_types)]
     closed,
     #[allow(non_camel_case_types)]
-    edited,
-    #[allow(non_camel_case_types)]
     opened,
-    #[allow(non_camel_case_types)]
-    started,
+    #[serde(skip_deserializing)]
+    Unknown,
+}
+impl Action {
+    fn default() -> Self {
+        Action::Unknown
+    }
+}
+
+fn deserialize_field_action<'de, D>(deserializer: D) -> Result<Action, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    Ok(Action::deserialize(deserializer).unwrap_or(Action::Unknown))
 }
 
 #[derive(Debug, Deserialize, Eq, PartialEq)]
 pub enum Type {
-    CommitCommentEvent,
-    CreateEvent,
-    DeleteEvent,
-    DeploymentEvent,
-    DeploymentStatusEvent,
-    DownloadEvent,
-    FollowEvent,
-    ForkEvent,
-    ForkApplyEvent,
-    GistEvent,
-    GollumEvent,
-    InstallationEvent,
-    InstallationRepositoriesEvent,
     IssueCommentEvent,
-    IssuesEvent,
-    LabelEvent,
-    MarketplacePurchaseEvent,
-    MemberEvent,
-    MembershipEvent,
-    MilestoneEvent,
-    OrganizationEvent,
-    OrgBlockEvent,
-    PageBuildEvent,
-    ProjectCardEvent,
-    ProjectColumnEvent,
-    ProjectEvent,
-    PublicEvent,
     PullRequestEvent,
-    PullRequestReviewEvent,
     PullRequestReviewCommentEvent,
-    PushEvent,
-    ReleaseEvent,
-    RepositoryEvent,
-    StatusEvent,
-    TeamEvent,
-    TeamAddEvent,
-    WatchEvent,
+    #[serde(skip_deserializing)]
+    Unknown,
+}
+impl Type {
+    fn default() -> Self {
+        Type::Unknown
+    }
+}
+
+fn deserialize_field_type<'de, D>(deserializer: D) -> Result<Type, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    Ok(Type::deserialize(deserializer).unwrap_or(Type::Unknown))
 }
 
 mod tests {
@@ -200,14 +194,33 @@ mod tests {
                     login: "alice".to_string(),
                 },
                 payload: Payload {
-                    action: Some(Action::opened),
+                    action: Action::opened,
                 },
                 event_type: Type::PullRequestEvent,
                 created_at: Utc.ymd(2016, 12, 1).and_hms(16, 26, 43),
             }
         );
     }
 
+    #[test]
+    fn parse_github_event_with_unknown_enums() {
+        assert_eq!(
+            raw_github_events(include_str!(
+                "../../test/github_event_with_unknown_enums.json"
+            )).unwrap()[0],
+            RawEvent {
+                actor: Actor {
+                    login: "alice".to_string(),
+                },
+                payload: Payload {
+                    action: Action::Unknown,
+                },
+                event_type: Type::Unknown,
+                created_at: Utc.ymd(2016, 12, 1).and_hms(16, 26, 43),
+            }
+        );
+    }
+
     #[test]
     fn parse_real_github_events_from_nicokosi_pullpito() {
         let events = raw_github_events(include_str!("../../test/pullpito_github_events.json"));

src/lib.rs

@@ -20,6 +20,7 @@ use std::thread;
 use structopt::StructOpt;
 
 pub mod github_events;
+extern crate serde;
 
 #[derive(Debug, Deserialize, PartialEq, Serialize)]
 pub struct Config {
@@ -102,7 +103,8 @@ fn events_per_author(events: Vec<RawEvent>) -> HashMap<String, Vec<RawEvent>> {
                 || e.event_type == Type::IssueCommentEvent
         })
         .fold(HashMap::new(), |mut acc, event: RawEvent| {
-            (*acc.entry(event.actor.login.clone())
+            (*acc
+                .entry(event.actor.login.clone())
                 .or_insert_with(Vec::new))
                 .push(event);
             acc
@@ -116,7 +118,7 @@ fn printable(repo: &str, events_per_author: &HashMap<String, Vec<RawEvent>>) ->
         let opened_pull_requests = events
             .into_iter()
             .filter(|e| {
-                e.event_type == Type::PullRequestEvent && e.payload.action == Some(Action::opened)
+                e.event_type == Type::PullRequestEvent && e.payload.action == Action::opened
             })
             .count();
         if opened_pull_requests > 0 {
@@ -128,7 +130,7 @@ fn printable(repo: &str, events_per_author: &HashMap<String, Vec<RawEvent>>) ->
         let commented_pull_requests = events
             .into_iter()
             .filter(|e| {
-                e.event_type == Type::IssueCommentEvent && e.payload.action == Some(Action::created)
+                e.event_type == Type::IssueCommentEvent && e.payload.action == Action::created
             })
             .count();
         if commented_pull_requests > 0 {
@@ -140,7 +142,7 @@ fn printable(repo: &str, events_per_author: &HashMap<String, Vec<RawEvent>>) ->
         let closed_pull_requests = events
             .into_iter()
             .filter(|e| {
-                e.event_type == Type::PullRequestEvent && e.payload.action == Some(Action::closed)
+                e.event_type == Type::PullRequestEvent && e.payload.action == Action::closed
             })
             .count();
         if closed_pull_requests > 0 {
@@ -241,7 +243,7 @@ mod test {
                     login: "alice".to_string(),
                 },
                 payload: Payload {
-                    action: Some(Action::opened),
+                    action: Action::opened,
                 },
                 event_type: Type::PullRequestEvent,
                 created_at: Utc.ymd(2016, 12, 1).and_hms(16, 26, 43),
@@ -263,7 +265,7 @@ mod test {
                 login: "alice".to_string(),
             },
             payload: Payload {
-                action: Some(Action::opened),
+                action: Action::opened,
             },
             event_type: Type::PullRequestEvent,
             created_at: Utc.ymd(2016, 12, 1).and_hms(16, 26, 43),

test/github_event_with_unknown_enums.json

@@ -0,0 +1,19 @@
+[
+   {
+      "id": "1",
+      "type": "ThisTypeDoesNotExist",
+      "actor": {
+         "login": "alice",
+         "display_login": "Alice"
+      },
+      "repo": {
+         "id": 2,
+         "name": "softwarevidal/fake-repo"
+      },
+      "payload": {
+         "action": "ThisActionDoesNotExist"
+      },
+      "public": false,
+      "created_at": "2016-12-01T16:26:43Z"
+   }
+]