Making core no_std compatible

.history/src/lib_20201107132414.rs

@@ -0,0 +1,60 @@
+//! This crate implements the [CloudEvents](https://cloudevents.io/) Spec for Rust.
+//!
+//! ```
+//! # use std::error::Error;
+//! # fn main() -> Result<(), Box<dyn Error>> {
+//! use cloudevents::{EventBuilder, AttributesReader, EventBuilderV10};
+//! use chrono::{Utc, DateTime};
+//! use url::Url;
+//!
+//! let event = EventBuilderV10::new()
+//!     .id("my_event.my_application")
+//!     .source("http://localhost:8080")
+//!     .ty("example.demo")
+//!     .time(Utc::now())
+//!     .build()?;
+//!
+//! println!("CloudEvent Id: {}", event.id());
+//! match event.time() {
+//!     Some(t) => println!("CloudEvent Time: {}", t),
+//!     None => println!("CloudEvent Time: None")
+//! }
+//! # Ok(())
+//! # }
+//! ```
+//!
+//! This crate includes:
+//!
+//! * The [`Event`] data structure, to represent CloudEvent (version 1.0 and 0.3)
+//! * The [`EventBuilder`] trait and implementations, to create [`Event`] instances
+//! * The implementation of [`serde::Serialize`] and [`serde::Deserialize`] for [`Event`] to serialize/deserialize CloudEvents to/from JSON
+//! * Traits and utilities in [`message`] to implement Protocol Bindings
+//!
+//! If you're looking for Protocol Binding implementations, look at crates:
+//!
+//! * [cloudevents-sdk-actix-web](https://docs.rs/cloudevents-sdk-actix-web): Integration with [Actix Web](https://github.com/actix/actix-web)
+//! * [cloudevents-sdk-reqwest](https://docs.rs/cloudevents-sdk-reqwest): Integration with [reqwest](https://github.com/seanmonstar/reqwest)
+//! * [cloudevents-sdk-rdkafka](https://docs.rs/cloudevents-sdk-rdkafka): Integration with [rdkafka](https://fede1024.github.io/rust-rdkafka)
+//!
+
+<<<<<<< master
+#![doc(html_root_url = "https://docs.rs/cloudevents-sdk/0.3.0")]
+#![deny(broken_intra_doc_links)]
+=======
+#![no_std]
+
+extern crate no_std_compat as std;
+
+extern crate serde;
+extern crate serde_json;
+extern crate serde_value;
+extern crate snafu;
+>>>>>>> no_std #1
+
+pub mod event;
+pub mod message;
+
+pub use event::Data;
+pub use event::Event;
+pub use event::{AttributesReader, AttributesWriter};
+pub use event::{EventBuilder, EventBuilderV03, EventBuilderV10};

.history/src/lib_20201107132439.rs

@@ -0,0 +1,57 @@
+//! This crate implements the [CloudEvents](https://cloudevents.io/) Spec for Rust.
+//!
+//! ```
+//! # use std::error::Error;
+//! # fn main() -> Result<(), Box<dyn Error>> {
+//! use cloudevents::{EventBuilder, AttributesReader, EventBuilderV10};
+//! use chrono::{Utc, DateTime};
+//! use url::Url;
+//!
+//! let event = EventBuilderV10::new()
+//!     .id("my_event.my_application")
+//!     .source("http://localhost:8080")
+//!     .ty("example.demo")
+//!     .time(Utc::now())
+//!     .build()?;
+//!
+//! println!("CloudEvent Id: {}", event.id());
+//! match event.time() {
+//!     Some(t) => println!("CloudEvent Time: {}", t),
+//!     None => println!("CloudEvent Time: None")
+//! }
+//! # Ok(())
+//! # }
+//! ```
+//!
+//! This crate includes:
+//!
+//! * The [`Event`] data structure, to represent CloudEvent (version 1.0 and 0.3)
+//! * The [`EventBuilder`] trait and implementations, to create [`Event`] instances
+//! * The implementation of [`serde::Serialize`] and [`serde::Deserialize`] for [`Event`] to serialize/deserialize CloudEvents to/from JSON
+//! * Traits and utilities in [`message`] to implement Protocol Bindings
+//!
+//! If you're looking for Protocol Binding implementations, look at crates:
+//!
+//! * [cloudevents-sdk-actix-web](https://docs.rs/cloudevents-sdk-actix-web): Integration with [Actix Web](https://github.com/actix/actix-web)
+//! * [cloudevents-sdk-reqwest](https://docs.rs/cloudevents-sdk-reqwest): Integration with [reqwest](https://github.com/seanmonstar/reqwest)
+//! * [cloudevents-sdk-rdkafka](https://docs.rs/cloudevents-sdk-rdkafka): Integration with [rdkafka](https://fede1024.github.io/rust-rdkafka)
+//!
+
+#![doc(html_root_url = "https://docs.rs/cloudevents-sdk/0.3.0")]
+#![deny(broken_intra_doc_links)]
+#![no_std]
+
+extern crate no_std_compat as std;
+
+extern crate serde;
+extern crate serde_json;
+extern crate serde_value;
+extern crate snafu;
+
+pub mod event;
+pub mod message;
+
+pub use event::Data;
+pub use event::Event;
+pub use event::{AttributesReader, AttributesWriter};
+pub use event::{EventBuilder, EventBuilderV03, EventBuilderV10};

Cargo.toml

@@ -16,22 +16,33 @@ categories = ["web-programming", "encoding", "data-structures"]
 [lib]
 name = "cloudevents"
 
+[features]
+default = ["no_std"]
+std = ["no_std_compat_bypass","snafu/std", "snafu/guide", "serde/std", "serde_json/std", "chrono/std", "base64/std", "url"]
+no_std = ["no_std_compat_bypass", "serde_no_std", "chrono_no_std", "base64/alloc"]
+
+no_std_compat_bypass=["no-std-compat/std"]
+no_std_compat_layer=["no-std-compat/alloc", "no-std-compat/compat_hash", "no-std-compat/compat_sync"]
+chrono_no_std = ["chrono/serde", "chrono/alloc", "chrono/clock"]
+serde_no_std = ["serde/derive", "serde/alloc", "serde_json/alloc"]
+
 [dependencies]
-serde = { version = "^1.0", features = ["derive"] }
-serde_json = "^1.0"
-chrono = { version = "^0.4", features = ["serde"] }
+base64 = { version = "^0.12", default-features = false }
+chrono = { version = "^0.4", default-features = false , features = ["serde", "clock"]}
 delegate-attr = "^0.2"
-base64 = "^0.12"
-url = { version = "^2.1", features = ["serde"] }
-snafu = "^0.6"
-bitflags = "^1.2"
+serde = { version = "^1.0", default-features=false }
+serde_json = { version = "^1.0", default-features = false, features = ["alloc"] }
+snafu = { version = "^0.6", default-features = false }
+url = { version = "^2.1", features = ["serde"], optional=true }
+
+no-std-compat = { version = "^0.4.1", features = ["alloc", "compat_hash", "compat_sync"], optional=true }
 
 [target."cfg(not(target_arch = \"wasm32\"))".dependencies]
 hostname = "^0.3"
 uuid = { version = "^0.8", features = ["v4"] }
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
-web-sys = { version = "^0.3", features = ["Window", "Location"] }
+web-sys = { version = "^0.3", default-features = false,features = ["Window", "Location"] }
 uuid = { version = "^0.8", features = ["v4", "wasm-bindgen"] }
 
 [dev-dependencies]

src/event/attributes.rs

@@ -5,6 +5,11 @@ use super::{
 use chrono::{DateTime, Utc};
 use serde::Serializer;
 use std::fmt;
+use std::prelude::v1::*;
+
+#[cfg(not(feature = "std"))]
+use std::string::String as Url;
+#[cfg(feature = "std")]
 use url::Url;
 
 /// Enum representing a borrowed value of a CloudEvent attribute.
@@ -252,6 +257,7 @@ impl Attributes {
     }
 }
 
+#[cfg(feature = "std")]
 #[cfg(not(target_arch = "wasm32"))]
 pub(crate) fn default_hostname() -> Url {
     Url::parse(
@@ -268,6 +274,7 @@ pub(crate) fn default_hostname() -> Url {
     .unwrap()
 }
 
+#[cfg(feature = "std")]
 #[cfg(target_arch = "wasm32")]
 pub(crate) fn default_hostname() -> Url {
     use std::str::FromStr;
@@ -281,3 +288,8 @@ pub(crate) fn default_hostname() -> Url {
     )
     .unwrap()
 }
+
+#[cfg(not(feature = "std"))]
+pub(crate) fn default_hostname() -> Url {
+    String::from("http://localhost")
+}

src/event/builder.rs

@@ -1,4 +1,4 @@
-use super::Event;
+use super::{url, DisplayError, Event};
 use snafu::Snafu;
 
 /// Trait to implement a builder for [`Event`]:
@@ -41,7 +41,8 @@ pub enum Error {
     ))]
     ParseTimeError {
         attribute_name: &'static str,
-        source: chrono::ParseError,
+        #[snafu(source(from(chrono::ParseError, DisplayError)))]
+        source: DisplayError<chrono::ParseError>,
     },
     #[snafu(display(
         "Error while setting attribute '{}' with uri/uriref type: {}",
@@ -50,6 +51,7 @@ pub enum Error {
     ))]
     ParseUrlError {
         attribute_name: &'static str,
-        source: url::ParseError,
+        #[snafu(source(from(url::ParseError, DisplayError)))]
+        source: DisplayError<url::ParseError>,
     },
 }

src/event/data.rs

@@ -2,6 +2,7 @@ use serde_json::Value;
 use std::convert::TryFrom;
 use std::fmt;
 use std::fmt::Formatter;
+use std::prelude::v1::*;
 
 /// Event [data attribute](https://github.com/cloudevents/spec/blob/master/spec.md#event-data) representation
 #[derive(PartialEq, Eq, Debug, Clone)]