Use nonmax::NonMax* types in Options wherever possible (#2681)

This swaps fields that store `Option<Int>` for `Option<NonMaxInt>` where the
maximum value would be ludicrous. Since `nonmax` uses `NonZero` internally,
this gives us niche optimisations, so model sizes can drop some more.

I have had to include a workaround for [#17] in `optional_string` by making my
own `TryFrom<u64>`, so that should be removable once that issue is fixed.

[#17]: LPGhatguy/nonmax#17

Cargo.toml

@@ -33,6 +33,7 @@ arrayvec = { version = "0.7.4", features = ["serde"] }
 serde_cow = { version = "0.1.0" }
 small-fixed-array = { git = "https://github.com/GnomedDev/small-fixed-array", features = ["serde", "log_using_tracing"] }
 bool_to_bitflags = { git = "https://github.com/GnomedDev/bool-to-bitflags", version = "0.1.0" }
+nonmax = { version = "0.5.5", features = ["serde"] }
 # Optional dependencies
 fxhash = { version = "0.2.1", optional = true }
 simd-json = { version = "0.13.4", optional = true }
@@ -51,7 +52,7 @@ mime_guess = { version = "2.0.4", optional = true }
 dashmap = { version = "5.5.3", features = ["serde"], optional = true }
 parking_lot = { version = "0.12.1", optional = true }
 ed25519-dalek = { version = "2.0.0", optional = true }
-typesize = { version = "0.1.4", optional = true, features = ["url", "time", "serde_json", "secrecy", "dashmap", "parking_lot", "details"] }
+typesize = { version = "0.1.5", optional = true, features = ["url", "time", "serde_json", "secrecy", "dashmap", "parking_lot", "nonmax", "details"] }
 # serde feature only allows for serialisation,
 # Serenity workspace crates
 command_attr = { version = "0.5.1", path = "./command_attr", optional = true }

examples/e05_command_framework/src/main.rs

@@ -555,8 +555,11 @@ async fn slow_mode(ctx: &Context, msg: &Message, mut args: Args) -> CommandResul
             format!("Successfully set slow mode rate to `{slow_mode_rate_seconds}` seconds.")
         }
     } else if let Some(channel) = msg.channel_id.to_channel_cached(&ctx.cache) {
-        let slow_mode_rate = channel.rate_limit_per_user.unwrap_or(0);
-        format!("Current slow mode rate is `{slow_mode_rate}` seconds.")
+        if let Some(slow_mode_rate) = channel.rate_limit_per_user {
+            format!("Current slow mode rate is `{slow_mode_rate}` seconds.")
+        } else {
+            "There is no current slow mode rate for this channel.".to_string()
+        }
     } else {
         "Failed to find channel in cache.".to_string()
     };

src/model/channel/attachment.rs

@@ -1,3 +1,4 @@
+use nonmax::NonMaxU32;
 #[cfg(feature = "model")]
 use reqwest::Client as ReqwestClient;
 use serde_cow::CowStr;
@@ -40,15 +41,15 @@ pub struct Attachment {
     /// Sescription for the file (max 1024 characters).
     pub description: Option<FixedString<u16>>,
     /// If the attachment is an image, then the height of the image is provided.
-    pub height: Option<u32>,
+    pub height: Option<NonMaxU32>,
+    /// If the attachment is an image, then the width of the image is provided.
+    pub width: Option<NonMaxU32>,
     /// The proxy URL.
     pub proxy_url: FixedString,
     /// The size of the file in bytes.
     pub size: u32,
     /// The URL of the uploaded attachment.
     pub url: FixedString,
-    /// If the attachment is an image, then the width of the image is provided.
-    pub width: Option<u32>,
     /// The attachment's [media type].
     ///
     /// [media type]: https://en.wikipedia.org/wiki/Media_type
@@ -80,7 +81,7 @@ pub struct Attachment {
 impl Attachment {
     /// If this attachment is an image, then a tuple of the width and height in pixels is returned.
     #[must_use]
-    pub fn dimensions(&self) -> Option<(u32, u32)> {
+    pub fn dimensions(&self) -> Option<(NonMaxU32, NonMaxU32)> {
         self.width.and_then(|width| self.height.map(|height| (width, height)))
     }
 

src/model/channel/embed.rs

@@ -1,3 +1,5 @@
+use nonmax::NonMaxU32;
+
 use crate::internal::prelude::*;
 use crate::model::{Colour, Timestamp};
 
@@ -171,9 +173,9 @@ pub struct EmbedImage {
     /// A proxied URL of the image.
     pub proxy_url: Option<FixedString>,
     /// The height of the image.
-    pub height: Option<u32>,
+    pub height: Option<NonMaxU32>,
     /// The width of the image.
-    pub width: Option<u32>,
+    pub width: Option<NonMaxU32>,
 }
 
 /// The provider of an embed.
@@ -203,9 +205,9 @@ pub struct EmbedThumbnail {
     /// A proxied URL of the thumbnail.
     pub proxy_url: Option<FixedString>,
     /// The height of the thumbnail in pixels.
-    pub height: Option<u32>,
+    pub height: Option<NonMaxU32>,
     /// The width of the thumbnail in pixels.
-    pub width: Option<u32>,
+    pub width: Option<NonMaxU32>,
 }
 
 /// Video information for an embed.
@@ -220,7 +222,7 @@ pub struct EmbedVideo {
     /// A proxied URL of the thumbnail.
     pub proxy_url: Option<FixedString>,
     /// The height of the video in pixels.
-    pub height: Option<u32>,
+    pub height: Option<NonMaxU32>,
     /// The width of the video in pixels.
-    pub width: Option<u32>,
+    pub width: Option<NonMaxU32>,
 }

src/model/channel/guild_channel.rs

@@ -2,6 +2,8 @@ use std::fmt;
 #[cfg(feature = "model")]
 use std::sync::Arc;
 
+use nonmax::{NonMaxU16, NonMaxU32, NonMaxU8};
+
 #[cfg(feature = "model")]
 use crate::builder::{
     Builder,
@@ -44,7 +46,7 @@ pub struct GuildChannel {
     /// The bitrate of the channel.
     ///
     /// **Note**: This is only available for voice and stage channels.
-    pub bitrate: Option<u32>,
+    pub bitrate: Option<NonMaxU32>,
     /// The Id of the parent category for a channel, or of the parent text channel for a thread.
     ///
     /// **Note**: This is only available for channels in a category and thread channels.
@@ -88,7 +90,7 @@ pub struct GuildChannel {
     /// The maximum number of members allowed in the channel.
     ///
     /// **Note**: This is only available for voice channels.
-    pub user_limit: Option<u32>,
+    pub user_limit: Option<NonMaxU8>,
     /// Used to tell if the channel is not safe for work.
     // This field can or can not be present sometimes, but if it isn't default to `false`.
     #[serde(default)]
@@ -98,7 +100,7 @@ pub struct GuildChannel {
     /// **Note**: This is only available for text channels excluding news channels.
     #[doc(alias = "slowmode")]
     #[serde(default)]
-    pub rate_limit_per_user: Option<u16>,
+    pub rate_limit_per_user: Option<NonMaxU16>,
     /// The region override.
     ///
     /// **Note**: This is only available for voice and stage channels. [`None`] for voice and stage
@@ -108,14 +110,12 @@ pub struct GuildChannel {
     pub video_quality_mode: Option<VideoQualityMode>,
     /// An approximate count of messages in the thread.
     ///
-    /// This is currently saturated at 255 to prevent breaking.
-    ///
     /// **Note**: This is only available on thread channels.
-    pub message_count: Option<u32>,
+    pub message_count: Option<NonMaxU32>,
     /// An approximate count of users in a thread, stops counting at 50.
     ///
     /// **Note**: This is only available on thread channels.
-    pub member_count: Option<u8>,
+    pub member_count: Option<NonMaxU8>,
     /// The thread metadata.
     ///
     /// **Note**: This is only available on thread channels.
@@ -137,7 +137,7 @@ pub struct GuildChannel {
     pub flags: ChannelFlags,
     /// The number of messages ever sent in a thread, it's similar to `message_count` on message
     /// creation, but will not decrement the number when a message is deleted.
-    pub total_message_sent: Option<u64>,
+    pub total_message_sent: Option<NonMaxU32>,
     /// The set of available tags.
     ///
     /// **Note**: This is only available in forum channels.
@@ -156,7 +156,7 @@ pub struct GuildChannel {
     /// is copied to the thread at creation time and does not live update.
     ///
     /// **Note**: This is only available in a forum or text channel.
-    pub default_thread_rate_limit_per_user: Option<u16>,
+    pub default_thread_rate_limit_per_user: Option<NonMaxU16>,
     /// The status of a voice channel.
     ///
     /// **Note**: This is only available in voice channels.

src/model/channel/message.rs

@@ -5,6 +5,8 @@ use std::fmt::Display;
 #[cfg(all(feature = "cache", feature = "model"))]
 use std::fmt::Write;
 
+use nonmax::NonMaxU64;
+
 #[cfg(all(feature = "model", feature = "utils"))]
 use crate::builder::{Builder, CreateAllowedMentions, CreateMessage, EditMessage};
 #[cfg(all(feature = "cache", feature = "model"))]
@@ -129,7 +131,7 @@ pub struct Message {
     /// A generally increasing integer (there may be gaps or duplicates) that represents the
     /// approximate position of the message in a thread, it can be used to estimate the relative
     /// position of the message in a thread in company with total_message_sent on parent thread.
-    pub position: Option<u64>,
+    pub position: Option<NonMaxU64>,
     /// Data of the role subscription purchase or renewal that prompted this
     /// [`MessageType::RoleSubscriptionPurchase`] message.
     pub role_subscription_data: Option<RoleSubscriptionData>,

src/model/event.rs

@@ -6,6 +6,7 @@
 // Just for MessageUpdateEvent (for some reason the #[allow] doesn't work when placed directly)
 #![allow(clippy::option_option)]
 
+use nonmax::NonMaxU64;
 use serde::de::Error as DeError;
 use serde::Serialize;
 
@@ -539,7 +540,7 @@ pub struct MessageUpdateEvent {
     pub thread: Option<Option<Box<GuildChannel>>>,
     pub components: Option<FixedArray<ActionRow>>,
     pub sticker_items: Option<FixedArray<StickerItem>>,
-    pub position: Option<Option<u64>>,
+    pub position: Option<Option<NonMaxU64>>,
     pub role_subscription_data: Option<Option<RoleSubscriptionData>>,
     pub guild_id: Option<GuildId>,
     pub member: Option<Option<Box<PartialMember>>>,

src/model/gateway.rs

@@ -1,6 +1,6 @@
 //! Models pertaining to the gateway.
 
-use std::num::NonZeroU16;
+use std::num::{NonZeroU16, NonZeroU64};
 
 use serde::ser::SerializeSeq;
 use url::Url;
@@ -402,8 +402,8 @@ impl serde::Serialize for ShardInfo {
 #[derive(Clone, Debug, Deserialize, Serialize)]
 #[non_exhaustive]
 pub struct ActivityTimestamps {
-    pub end: Option<u64>,
-    pub start: Option<u64>,
+    pub end: Option<NonZeroU64>,
+    pub start: Option<NonZeroU64>,
 }
 
 bitflags! {

src/model/guild/audit_log/mod.rs

@@ -2,6 +2,7 @@
 
 use std::mem::transmute;
 
+use nonmax::{NonMaxU32, NonMaxU64};
 use serde::ser::{Serialize, Serializer};
 
 mod change;
@@ -369,16 +370,16 @@ pub struct Options {
     pub application_id: Option<ApplicationId>,
     /// Number of days after which inactive members were kicked.
     #[serde(default, with = "optional_string")]
-    pub delete_member_days: Option<u64>,
+    pub delete_member_days: Option<NonMaxU32>,
     /// Number of members removed by the prune
     #[serde(default, with = "optional_string")]
-    pub members_removed: Option<u64>,
+    pub members_removed: Option<NonMaxU64>,
     /// Channel in which the messages were deleted
     #[serde(default)]
     pub channel_id: Option<ChannelId>,
     /// Number of deleted messages.
     #[serde(default, with = "optional_string")]
-    pub count: Option<u64>,
+    pub count: Option<NonMaxU64>,
     /// Id of the overwritten entity
     #[serde(default)]
     pub id: Option<GenericId>,

src/model/guild/audit_log/utils.rs

@@ -41,27 +41,69 @@ pub mod webhooks {
 /// Used with `#[serde(with = "optional_string")]`.
 pub mod optional_string {
     use std::fmt;
+    use std::marker::PhantomData;
+    use std::str::FromStr;
 
     use serde::de::{Deserializer, Error, Visitor};
     use serde::ser::Serializer;
 
-    pub fn deserialize<'de, D: Deserializer<'de>>(
-        deserializer: D,
-    ) -> Result<Option<u64>, D::Error> {
-        deserializer.deserialize_option(OptionalStringVisitor)
+    // Workaround for https://github.com/LPGhatguy/nonmax/issues/17
+    pub(crate) trait TryFromU64
+    where
+        Self: Sized,
+    {
+        type Err: fmt::Display;
+        fn try_from_u64(value: u64) -> Result<Self, Self::Err>;
+    }
+
+    impl TryFromU64 for u64 {
+        type Err = std::convert::Infallible;
+        fn try_from_u64(value: u64) -> Result<Self, Self::Err> {
+            Ok(value)
+        }
+    }
+
+    impl TryFromU64 for nonmax::NonMaxU64 {
+        type Err = nonmax::TryFromIntError;
+        fn try_from_u64(value: u64) -> Result<Self, Self::Err> {
+            Self::try_from(value)
+        }
+    }
+
+    impl TryFromU64 for nonmax::NonMaxU32 {
+        type Err = nonmax::TryFromIntError;
+        fn try_from_u64(value: u64) -> Result<Self, Self::Err> {
+            Self::try_from(u32::try_from(value)?)
+        }
+    }
+
+    pub fn deserialize<'de, D, T>(deserializer: D) -> Result<Option<T>, D::Error>
+    where
+        D: Deserializer<'de>,
+        T: FromStr + TryFromU64,
+        <T as FromStr>::Err: fmt::Display,
+    {
+        deserializer.deserialize_option(OptionalStringVisitor::<T>(PhantomData))
     }
 
-    pub fn serialize<S: Serializer>(value: &Option<u64>, serializer: S) -> Result<S::Ok, S::Error> {
+    pub fn serialize<S: Serializer>(
+        value: &Option<impl ToString>,
+        serializer: S,
+    ) -> Result<S::Ok, S::Error> {
         match value {
             Some(value) => serializer.serialize_some(&value.to_string()),
             None => serializer.serialize_none(),
         }
     }
 
-    struct OptionalStringVisitor;
+    struct OptionalStringVisitor<T>(PhantomData<T>);
 
-    impl<'de> Visitor<'de> for OptionalStringVisitor {
-        type Value = Option<u64>;
+    impl<'de, T> Visitor<'de> for OptionalStringVisitor<T>
+    where
+        T: FromStr + TryFromU64,
+        <T as FromStr>::Err: fmt::Display,
+    {
+        type Value = Option<T>;
 
         fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
             formatter.write_str("an optional integer or a string with a valid number inside")
@@ -71,7 +113,7 @@ pub mod optional_string {
             self,
             deserializer: D,
         ) -> Result<Self::Value, D::Error> {
-            deserializer.deserialize_any(OptionalStringVisitor)
+            deserializer.deserialize_any(OptionalStringVisitor(PhantomData))
         }
 
         fn visit_none<E: Error>(self) -> Result<Self::Value, E> {
@@ -83,11 +125,11 @@ pub mod optional_string {
             Ok(None)
         }
 
-        fn visit_u64<E: Error>(self, val: u64) -> Result<Option<u64>, E> {
-            Ok(Some(val))
+        fn visit_u64<E: Error>(self, val: u64) -> Result<Self::Value, E> {
+            T::try_from_u64(val).map(Some).map_err(Error::custom)
         }
 
-        fn visit_str<E: Error>(self, string: &str) -> Result<Option<u64>, E> {
+        fn visit_str<E: Error>(self, string: &str) -> Result<Self::Value, E> {
             string.parse().map(Some).map_err(Error::custom)
         }
     }

src/model/guild/integration.rs

@@ -1,5 +1,9 @@
 use crate::model::prelude::*;
 
+use nonmax::{NonMaxU32, NonMaxU64};
+
+use super::*;
+
 /// Various information about integrations.
 ///
 /// [Discord docs](https://discord.com/developers/docs/resources/guild#integration-object),
@@ -20,11 +24,11 @@ pub struct Integration {
     pub enable_emoticons: Option<bool>,
     #[serde(rename = "expire_behavior")]
     pub expire_behaviour: Option<IntegrationExpireBehaviour>,
-    pub expire_grace_period: Option<u64>,
+    pub expire_grace_period: Option<NonMaxU32>,
     pub user: Option<User>,
     pub account: IntegrationAccount,
     pub synced_at: Option<Timestamp>,
-    pub subscriber_count: Option<u64>,
+    pub subscriber_count: Option<NonMaxU64>,
     pub revoked: Option<bool>,
     pub application: Option<IntegrationApplication>,
     pub scopes: Option<Vec<Scope>>,