Merge 6d07bcde93 into 2cae3f0b36

.github/workflows/rust_tests.yml

@@ -53,14 +53,14 @@ jobs:
 
     # If glibc, compile and test all
     - uses: actions-rs/cargo@v1
-      name: "Build"
+      name: "Build glibc"
       if: matrix.target == 'x86_64-unknown-linux-gnu'
       with:
         command: build
         toolchain: ${{ matrix.toolchain }}
         args: --target ${{ matrix.target }} --all-features
     - uses: actions-rs/cargo@v1
-      name: "Test"
+      name: "Test glibc"
       if: matrix.target == 'x86_64-unknown-linux-gnu'
       with:
         command: test
@@ -129,3 +129,31 @@ jobs:
         command: build
         toolchain: ${{ matrix.toolchain }}
         args: --target ${{ matrix.target }} --manifest-path ./example-projects/warp-example/Cargo.toml
+
+  check_no_std:
+    name: Check no_std
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+      # Caching stuff
+      - uses: actions/cache@v2
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+          key: ${{ runner.os }}-cargo-no-std-deps-${{ hashFiles('**/Cargo.toml') }}
+      - uses: actions/cache@v2
+        with:
+          path: |
+            target/
+          key: ${{ runner.os }}-cargo-no-std-build-${{ hashFiles('**/Cargo.toml') }}
+      - name: Download cargo-nono
+        run: curl -LSfs https://japaric.github.io/trust/install.sh | sh -s -- --git hobofan/cargo-nono
+      - name: Run check
+        run: ./cargo-nono check

Cargo.toml

@@ -11,12 +11,17 @@ repository = "https://github.com/cloudevents/sdk-rust"
 exclude = [
     ".github/*"
 ]
-categories = ["web-programming", "encoding", "data-structures"]
+categories = ["web-programming", "encoding", "data-structures", "no_std"]
 
 [lib]
 name = "cloudevents"
 
 [features]
+# Without default features, the package acts as no_std
+default = ["std"]
+
+std = ["snafu/std", "url"]
+
 actix = ["actix-web", "async-trait", "lazy_static", "bytes", "futures"]
 reqwest = ["reqwest-lib", "async-trait", "lazy_static", "bytes"]
 rdkafka = ["rdkafka-lib", "lazy_static", "bytes", "futures"]
@@ -28,9 +33,9 @@ serde_json = "^1.0"
 chrono = { version = "^0.4", features = ["serde"] }
 delegate-attr = "^0.2"
 base64 = "^0.12"
-url = { version = "^2.1", features = ["serde"] }
+snafu = { version = "^0.6", default-features = false }
-snafu = "^0.6"
 bitflags = "^1.2"
+url = { version = "^2.1", features = ["serde"], optional = true }
 
 # runtime optional deps
 actix-web = { version = "^3", default-features = false, optional = true }
@@ -49,7 +54,7 @@ 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]

example-projects/no-std-example/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "no-std-example"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+cloudevents-sdk = { path = "../..", default-features = false }
+
+[profile.dev]
+panic = "abort"
+
+[profile.release]
+panic = "abort"

example-projects/no-std-example/src/main.rs

@@ -0,0 +1,25 @@
+#![no_std]
+#![no_main]
+
+use core::panic::PanicInfo;
+
+use cloudevents;
+use cloudevents::EventBuilder;
+
+#[panic_handler]
+fn panic(_info: &PanicInfo) -> ! {
+    loop {}
+}
+
+#[no_mangle]
+pub extern "C" fn _start() -> ! {
+    loop {
+        #[allow(dead_code)]
+        let event = cloudevents::EventBuilderV10::new()
+            .id("my_id")
+            .source("my_source")
+            .subject("some_subject")
+            .build()
+            .unwrap();
+    }
+}

src/event/attributes.rs

@@ -1,11 +1,10 @@
 use super::{
-    AttributesIntoIteratorV03, AttributesIntoIteratorV10, AttributesV03, AttributesV10,
+    types::*, AttributesIntoIteratorV03, AttributesIntoIteratorV10, AttributesV03, AttributesV10,
-    ExtensionValue, SpecVersion, UriReference,
+    ExtensionValue, SpecVersion,
 };
 use chrono::{DateTime, Utc};
 use serde::Serializer;
 use std::fmt;
-use url::Url;
 
 /// Enum representing a borrowed value of a CloudEvent attribute.
 /// This represents the types defined in the [CloudEvent spec type system](https://github.com/cloudevents/spec/blob/v1.0/spec.md#type-system)
@@ -13,7 +12,7 @@ use url::Url;
 pub enum AttributeValue<'a> {
     SpecVersion(SpecVersion),
     String(&'a str),
-    URI(&'a Url),
+    URI(&'a Uri),
     URIRef(&'a UriReference),
     Boolean(&'a bool),
     Integer(&'a i64),
@@ -57,7 +56,7 @@ pub trait AttributesReader {
     /// Get the [datacontenttype](https://github.com/cloudevents/spec/blob/master/spec.md#datacontenttype).
     fn datacontenttype(&self) -> Option<&str>;
     /// Get the [dataschema](https://github.com/cloudevents/spec/blob/master/spec.md#dataschema).
-    fn dataschema(&self) -> Option<&Url>;
+    fn dataschema(&self) -> Option<&Uri>;
     /// Get the [subject](https://github.com/cloudevents/spec/blob/master/spec.md#subject).
     fn subject(&self) -> Option<&str>;
     /// Get the [time](https://github.com/cloudevents/spec/blob/master/spec.md#time).
@@ -87,7 +86,7 @@ pub trait AttributesWriter {
         -> Option<String>;
     /// Set the [dataschema](https://github.com/cloudevents/spec/blob/master/spec.md#dataschema).
     /// Returns the previous value.
-    fn set_dataschema(&mut self, dataschema: Option<impl Into<Url>>) -> Option<Url>;
+    fn set_dataschema(&mut self, dataschema: Option<impl Into<Uri>>) -> Option<Uri>;
 }
 
 pub(crate) trait AttributesConverter {
@@ -154,7 +153,7 @@ impl AttributesReader for Attributes {
         }
     }
 
-    fn dataschema(&self) -> Option<&Url> {
+    fn dataschema(&self) -> Option<&Uri> {
         match self {
             Attributes::V03(a) => a.dataschema(),
             Attributes::V10(a) => a.dataschema(),
@@ -222,7 +221,7 @@ impl AttributesWriter for Attributes {
         }
     }
 
-    fn set_dataschema(&mut self, dataschema: Option<impl Into<Url>>) -> Option<Url> {
+    fn set_dataschema(&mut self, dataschema: Option<impl Into<Uri>>) -> Option<Uri> {
         match self {
             Attributes::V03(a) => a.set_dataschema(dataschema),
             Attributes::V10(a) => a.set_dataschema(dataschema),
@@ -253,8 +252,7 @@ impl Attributes {
 }
 
 #[cfg(not(target_arch = "wasm32"))]
-pub(crate) fn default_hostname() -> Url {
+pub(crate) fn default_hostname() -> Uri {
-    Url::parse(
     format!(
         "http://{}",
         hostname::get()
@@ -263,21 +261,18 @@ pub(crate) fn default_hostname() -> Url {
             .flatten()
             .unwrap_or_else(|| "localhost".to_string())
     )
-        .as_ref(),
+    .into_uri()
-    )
     .unwrap()
 }
 
 #[cfg(target_arch = "wasm32")]
-pub(crate) fn default_hostname() -> Url {
+pub(crate) fn default_hostname() -> Uri {
     use std::str::FromStr;
 
-    Url::from_str(
     web_sys::window()
         .map(|w| w.location().host().ok())
         .flatten()
         .unwrap_or(String::from("http://localhost"))
-            .as_str(),
+        .into_uri()
-    )
         .unwrap()
 }

src/event/builder.rs

@@ -1,3 +1,4 @@
+use super::types;
 use super::Event;
 use snafu::Snafu;
 
@@ -5,7 +6,6 @@ use snafu::Snafu;
 /// ```
 /// use cloudevents::event::{EventBuilderV10, EventBuilder};
 /// use chrono::Utc;
-/// use url::Url;
 ///
 /// let event = EventBuilderV10::new()
 ///     .id("my_event.my_application")
@@ -48,9 +48,9 @@ pub enum Error {
         attribute_name,
         source
     ))]
-    ParseUrlError {
+    ParseUriError {
         attribute_name: &'static str,
-        source: url::ParseError,
+        source: types::ParseUriError,
     },
     #[snafu(display(
         "Invalid value setting attribute '{}' with uriref type",

src/event/mod.rs

@@ -8,7 +8,7 @@ mod extensions;
 mod format;
 mod message;
 mod spec_version;
-mod types;
+pub mod types;
 
 pub use attributes::Attributes;
 pub use attributes::{AttributeValue, AttributesReader, AttributesWriter};
@@ -20,7 +20,6 @@ pub(crate) use message::EventBinarySerializer;
 pub(crate) use message::EventStructuredSerializer;
 pub use spec_version::SpecVersion;
 pub use spec_version::UnknownSpecVersion;
-pub use types::{TryIntoTime, TryIntoUrl, UriReference};
 
 mod v03;
 
@@ -38,11 +37,10 @@ pub use v10::EventBuilder as EventBuilderV10;
 pub(crate) use v10::EventFormatDeserializer as EventFormatDeserializerV10;
 pub(crate) use v10::EventFormatSerializer as EventFormatSerializerV10;
 
-use chrono::{DateTime, Utc};
 use delegate_attr::delegate;
 use std::collections::HashMap;
 use std::fmt;
-use url::Url;
+use types::*;
 
 /// Data structure that represents a [CloudEvent](https://github.com/cloudevents/spec/blob/master/spec.md).
 /// It provides methods to get the attributes through [`AttributesReader`]
@@ -89,7 +87,7 @@ impl AttributesReader for Event {
     fn specversion(&self) -> SpecVersion;
     fn ty(&self) -> &str;
     fn datacontenttype(&self) -> Option<&str>;
-    fn dataschema(&self) -> Option<&Url>;
+    fn dataschema(&self) -> Option<&Uri>;
     fn subject(&self) -> Option<&str>;
     fn time(&self) -> Option<&DateTime<Utc>>;
 }
@@ -103,7 +101,7 @@ impl AttributesWriter for Event {
     fn set_time(&mut self, time: Option<impl Into<DateTime<Utc>>>) -> Option<DateTime<Utc>>;
     fn set_datacontenttype(&mut self, datacontenttype: Option<impl Into<String>>)
         -> Option<String>;
-    fn set_dataschema(&mut self, dataschema: Option<impl Into<Url>>) -> Option<Url>;
+    fn set_dataschema(&mut self, dataschema: Option<impl Into<Uri>>) -> Option<Uri>;
 }
 
 impl Default for Event {
@@ -165,10 +163,10 @@ impl Event {
     ///
     /// let (datacontenttype, dataschema, data) = e.take_data();
     /// ```
-    pub fn take_data(&mut self) -> (Option<String>, Option<Url>, Option<Data>) {
+    pub fn take_data(&mut self) -> (Option<String>, Option<Uri>, Option<Data>) {
         (
             self.attributes.set_datacontenttype(None as Option<String>),
-            self.attributes.set_dataschema(None as Option<Url>),
+            self.attributes.set_dataschema(None as Option<Uri>),
             self.data.take(),
         )
     }

src/event/types.rs

@@ -1,29 +1,88 @@
-use chrono::{DateTime, Utc};
+pub use self::uri::ParseUriError;
-use url::Url;
+pub use self::uri::TryIntoUri;
+pub use self::uri::Uri;
 
-/// Trait to define conversion to [`Url`]
+pub use urireference::UriReference;
-pub trait TryIntoUrl {
+
-    fn into_url(self) -> Result<Url, url::ParseError>;
+pub use chrono::{DateTime, Utc};
+pub use time::TryIntoTime;
+
+mod uri {
+    #[cfg(feature = "std")]
+    pub use url::Url as Uri;
+    #[cfg(not(feature = "std"))]
+    pub use String as Uri;
+
+    #[cfg(feature = "std")]
+    pub use url::ParseError as ParseUriError;
+    #[cfg(not(feature = "std"))]
+    pub use None as ParseUriError;
+
+    /// Trait to define conversion to [`Uri`]
+    pub trait TryIntoUri {
+        fn into_uri(self) -> Result<Uri, ParseUriError>;
     }
 
-impl TryIntoUrl for Url {
+    #[cfg(feature = "std")]
-    fn into_url(self) -> Result<Url, url::ParseError> {
+    impl TryIntoUri for Uri {
+        fn into_uri(self) -> Result<Uri, ParseUriError> {
             Ok(self)
         }
     }
 
-impl TryIntoUrl for &str {
+    #[cfg(feature = "std")]
-    fn into_url(self) -> Result<Url, url::ParseError> {
+    impl TryIntoUri for &str {
-        Url::parse(self)
+        fn into_uri(self) -> Result<Uri, ParseUriError> {
+            url::Url::parse(self)
         }
     }
 
-impl TryIntoUrl for String {
+    #[cfg(feature = "std")]
-    fn into_url(self) -> Result<Url, url::ParseError> {
+    impl TryIntoUri for String {
-        self.as_str().into_url()
+        fn into_uri(self) -> Result<Uri, ParseUriError> {
+            self.as_str().into_uri()
         }
     }
 
+    #[cfg(not(feature = "std"))]
+    impl TryIntoUri for Uri {
+        fn into_uri(self) -> Result<Uri, ParseUriError> {
+            Ok(self)
+        }
+    }
+
+    #[cfg(not(feature = "std"))]
+    impl TryIntoUri for &str {
+        fn into_uri(self) -> Result<Uri, ParseUriError> {
+            Ok(String::from(self))
+        }
+    }
+
+    #[cfg(not(feature = "std"))]
+    impl TryIntoUri for String {
+        fn into_uri(self) -> Result<Uri, ParseUriError> {
+            Ok(self)
+        }
+    }
+}
+
+mod urireference {
+    /// The URI-reference type.
+    ///
+    /// The URI reference can be a URI, or just a relative path.
+    ///
+    /// As the [`types::Url`] type can only represent an absolute URL, we are falling back to a string
+    /// here.
+    ///
+    /// Also see:
+    /// * <https://github.com/cloudevents/spec/blob/v1.0.1/spec.md#type-system>
+    /// * <https://tools.ietf.org/html/rfc3986#section-4.1>
+    pub type UriReference = String;
+}
+
+mod time {
+    use chrono::{DateTime, Utc};
+
     /// Trait to define conversion to [`DateTime`]
     pub trait TryIntoTime {
         fn into_time(self) -> Result<DateTime<Utc>, chrono::ParseError>;
@@ -46,15 +105,4 @@ impl TryIntoTime for String {
             self.as_str().into_time()
         }
     }
-
+}
-/// The URI-reference type.
-///
-/// The URI reference can be a URI, or just a relative path.
-///
-/// As the [`url::Url`] type can only represent an absolute URL, we are falling back to a string
-/// here.
-///
-/// Also see:
-/// * <https://github.com/cloudevents/spec/blob/v1.0.1/spec.md#type-system>
-/// * <https://tools.ietf.org/html/rfc3986#section-4.1>
-pub type UriReference = String;

src/event/v03/attributes.rs

@@ -1,8 +1,7 @@
 use crate::event::attributes::{default_hostname, AttributeValue, AttributesConverter};
-use crate::event::{AttributesReader, AttributesV10, AttributesWriter, SpecVersion, UriReference};
+use crate::event::types::*;
+use crate::event::{AttributesReader, AttributesV10, AttributesWriter, SpecVersion};
 use crate::message::{BinarySerializer, MessageAttributeValue};
-use chrono::{DateTime, Utc};
-use url::Url;
 use uuid::Uuid;
 
 pub(crate) const ATTRIBUTE_NAMES: [&str; 8] = [
@@ -23,7 +22,7 @@ pub struct Attributes {
     pub(crate) ty: String,
     pub(crate) source: UriReference,
     pub(crate) datacontenttype: Option<String>,
-    pub(crate) schemaurl: Option<Url>,
+    pub(crate) schemaurl: Option<Uri>,
     pub(crate) subject: Option<String>,
     pub(crate) time: Option<DateTime<Utc>>,
 }
@@ -105,7 +104,7 @@ impl AttributesReader for Attributes {
         self.datacontenttype.as_deref()
     }
 
-    fn dataschema(&self) -> Option<&Url> {
+    fn dataschema(&self) -> Option<&Uri> {
         self.schemaurl.as_ref()
     }
 
@@ -146,7 +145,7 @@ impl AttributesWriter for Attributes {
         std::mem::replace(&mut self.datacontenttype, datacontenttype.map(Into::into))
     }
 
-    fn set_dataschema(&mut self, dataschema: Option<impl Into<Url>>) -> Option<Url> {
+    fn set_dataschema(&mut self, dataschema: Option<impl Into<Uri>>) -> Option<Uri> {
         std::mem::replace(&mut self.schemaurl, dataschema.map(Into::into))
     }
 }

src/event/v03/builder.rs

@@ -1,13 +1,9 @@
 use super::Attributes as AttributesV03;
-use crate::event::{
+use crate::event::types::*;
-    Attributes, Data, Event, EventBuilderError, ExtensionValue, TryIntoTime, TryIntoUrl,
+use crate::event::{Attributes, Data, Event, EventBuilderError, ExtensionValue};
-    UriReference,
-};
 use crate::message::MessageAttributeValue;
-use chrono::{DateTime, Utc};
 use std::collections::HashMap;
 use std::convert::TryInto;
-use url::Url;
 
 /// Builder to create a CloudEvent V0.3
 #[derive(Clone, Debug)]
@@ -16,7 +12,7 @@ pub struct EventBuilder {
     ty: Option<String>,
     source: Option<UriReference>,
     datacontenttype: Option<String>,
-    schemaurl: Option<Url>,
+    schemaurl: Option<Uri>,
     subject: Option<String>,
     time: Option<DateTime<Utc>>,
     data: Option<Data>,
@@ -89,14 +85,14 @@ impl EventBuilder {
     pub fn data_with_schema(
         mut self,
         datacontenttype: impl Into<String>,
-        schemaurl: impl TryIntoUrl,
+        schemaurl: impl TryIntoUri,
         data: impl Into<Data>,
     ) -> Self {
         self.datacontenttype = Some(datacontenttype.into());
-        match schemaurl.into_url() {
+        match schemaurl.into_uri() {
             Ok(u) => self.schemaurl = Some(u),
             Err(e) => {
-                self.error = Some(EventBuilderError::ParseUrlError {
+                self.error = Some(EventBuilderError::ParseUriError {
                     attribute_name: "schemaurl",
                     source: e,
                 })

src/event/v03/format.rs

@@ -1,13 +1,12 @@
 use super::Attributes;
 use crate::event::data::is_json_content_type;
+use crate::event::types::*;
 use crate::event::{Data, ExtensionValue};
-use chrono::{DateTime, Utc};
 use serde::de::IntoDeserializer;
 use serde::ser::SerializeMap;
 use serde::{Deserialize, Serializer};
 use serde_json::{Map, Value};
 use std::collections::HashMap;
-use url::Url;
 
 pub(crate) struct EventFormatDeserializer {}
 
@@ -21,7 +20,7 @@ impl crate::event::format::EventFormatDeserializer for EventFormatDeserializer {
             source: extract_field!(map, "source", String, E)?,
             datacontenttype: extract_optional_field!(map, "datacontenttype", String, E)?,
             schemaurl: extract_optional_field!(map, "schemaurl", String, E, |s: String| {
-                Url::parse(&s)
+                s.into_uri()
             })?,
             subject: extract_optional_field!(map, "subject", String, E)?,
             time: extract_optional_field!(map, "time", String, E, |s: String| {

src/event/v10/attributes.rs

@@ -1,9 +1,8 @@
 use crate::event::attributes::{default_hostname, AttributeValue, AttributesConverter};
+use crate::event::types::*;
 use crate::event::{AttributesReader, AttributesV03, AttributesWriter, SpecVersion, UriReference};
 use crate::message::{BinarySerializer, MessageAttributeValue};
-use chrono::{DateTime, Utc};
 use core::fmt::Debug;
-use url::Url;
 use uuid::Uuid;
 
 pub(crate) const ATTRIBUTE_NAMES: [&str; 8] = [
@@ -24,7 +23,7 @@ pub struct Attributes {
     pub(crate) ty: String,
     pub(crate) source: UriReference,
     pub(crate) datacontenttype: Option<String>,
-    pub(crate) dataschema: Option<Url>,
+    pub(crate) dataschema: Option<Uri>,
     pub(crate) subject: Option<String>,
     pub(crate) time: Option<DateTime<Utc>>,
 }
@@ -106,7 +105,7 @@ impl AttributesReader for Attributes {
         self.datacontenttype.as_deref()
     }
 
-    fn dataschema(&self) -> Option<&Url> {
+    fn dataschema(&self) -> Option<&Uri> {
         self.dataschema.as_ref()
     }
 
@@ -147,7 +146,7 @@ impl AttributesWriter for Attributes {
         std::mem::replace(&mut self.datacontenttype, datacontenttype.map(Into::into))
     }
 
-    fn set_dataschema(&mut self, dataschema: Option<impl Into<Url>>) -> Option<Url> {
+    fn set_dataschema(&mut self, dataschema: Option<impl Into<Uri>>) -> Option<Uri> {
         std::mem::replace(&mut self.dataschema, dataschema.map(Into::into))
     }
 }

src/event/v10/builder.rs

@@ -1,13 +1,12 @@
 use super::Attributes as AttributesV10;
+use crate::event::types::*;
 use crate::event::{
-    Attributes, Data, Event, EventBuilderError, ExtensionValue, TryIntoTime, TryIntoUrl,
+    Attributes, Data, Event, EventBuilderError, ExtensionValue, TryIntoTime, TryIntoUri,
     UriReference,
 };
 use crate::message::MessageAttributeValue;
-use chrono::{DateTime, Utc};
 use std::collections::HashMap;
 use std::convert::TryInto;
-use url::Url;
 
 /// Builder to create a CloudEvent V1.0
 #[derive(Clone, Debug)]
@@ -16,7 +15,7 @@ pub struct EventBuilder {
     ty: Option<String>,
     source: Option<UriReference>,
     datacontenttype: Option<String>,
-    dataschema: Option<Url>,
+    dataschema: Option<Uri>,
     subject: Option<String>,
     time: Option<DateTime<Utc>>,
     data: Option<Data>,
@@ -89,14 +88,14 @@ impl EventBuilder {
     pub fn data_with_schema(
         mut self,
         datacontenttype: impl Into<String>,
-        schemaurl: impl TryIntoUrl,
+        schemaurl: impl TryIntoUri,
         data: impl Into<Data>,
     ) -> Self {
         self.datacontenttype = Some(datacontenttype.into());
-        match schemaurl.into_url() {
+        match schemaurl.into_uri() {
             Ok(u) => self.dataschema = Some(u),
             Err(e) => {
-                self.error = Some(EventBuilderError::ParseUrlError {
+                self.error = Some(EventBuilderError::ParseUriError {
                     attribute_name: "dataschema",
                     source: e,
                 })

src/event/v10/format.rs

@@ -1,13 +1,12 @@
 use super::Attributes;
 use crate::event::data::is_json_content_type;
+use crate::event::types::*;
 use crate::event::{Data, ExtensionValue};
-use chrono::{DateTime, Utc};
 use serde::de::IntoDeserializer;
 use serde::ser::SerializeMap;
 use serde::{Deserialize, Serializer};
 use serde_json::{Map, Value};
 use std::collections::HashMap;
-use url::Url;
 
 pub(crate) struct EventFormatDeserializer {}
 
@@ -21,7 +20,7 @@ impl crate::event::format::EventFormatDeserializer for EventFormatDeserializer {
             source: extract_field!(map, "source", String, E)?,
             datacontenttype: extract_optional_field!(map, "datacontenttype", String, E)?,
             dataschema: extract_optional_field!(map, "dataschema", String, E, |s: String| {
-                Url::parse(&s)
+                s.into_uri()
             })?,
             subject: extract_optional_field!(map, "subject", String, E)?,
             time: extract_optional_field!(map, "time", String, E, |s: String| {

src/lib.rs

@@ -4,8 +4,7 @@
 //! # use std::error::Error;
 //! # fn main() -> Result<(), Box<dyn Error>> {
 //! use cloudevents::{EventBuilder, AttributesReader, EventBuilderV10};
-//! use chrono::{Utc, DateTime};
+//! use chrono::Utc;
-//! use url::Url;
 //!
 //! let event = EventBuilderV10::new()
 //!     .id("my_event.my_application")
@@ -56,7 +55,18 @@
 #![doc(html_root_url = "https://docs.rs/cloudevents-sdk/0.4.0")]
 #![deny(broken_intra_doc_links)]
 
+#![cfg_attr(not(any(feature = "std", test)), no_std)]
+
+#[cfg(feature = "alloc")]
+extern crate alloc;
+#[cfg(all(feature = "std", not(feature = "alloc")))]
+extern crate std as alloc;
+#[cfg(any(feature = "std", test))]
+extern crate std as core;
+
+#[cfg(feature = "std")]
 pub mod binding;
+
 pub mod event;
 pub mod message;
 

src/message/error.rs

@@ -1,3 +1,4 @@
+use crate::event::types;
 use snafu::Snafu;
 
 /// Represents an error during serialization/deserialization process
@@ -22,7 +23,7 @@ pub enum Error {
     ParseTimeError { source: chrono::ParseError },
     #[snafu(display("Error while parsing a url: {}", source))]
     #[snafu(context(false))]
-    ParseUrlError { source: url::ParseError },
+    ParseUrlError { source: types::ParseUriError },
     #[snafu(display("Error while decoding base64: {}", source))]
     #[snafu(context(false))]
     Base64DecodingError { source: base64::DecodeError },

src/message/types.rs

@@ -1,8 +1,7 @@
-use crate::event::{ExtensionValue, UriReference};
+use crate::event::types::*;
-use chrono::{DateTime, Utc};
+use crate::event::ExtensionValue;
 use std::convert::TryInto;
 use std::fmt;
-use url::Url;
 
 /// Union type representing a [CloudEvent context attribute type](https://github.com/cloudevents/spec/blob/v1.0/spec.md#type-system).
 #[derive(PartialEq, Eq, Debug, Clone)]
@@ -11,7 +10,7 @@ pub enum MessageAttributeValue {
     Integer(i64),
     String(String),
     Binary(Vec<u8>),
-    Uri(Url),
+    Uri(Uri),
     UriRef(UriReference),
     DateTime(DateTime<Utc>),
 }
@@ -29,13 +28,13 @@ impl TryInto<DateTime<Utc>> for MessageAttributeValue {
     }
 }
 
-impl TryInto<Url> for MessageAttributeValue {
+impl TryInto<Uri> for MessageAttributeValue {
     type Error = super::Error;
 
-    fn try_into(self) -> Result<Url, Self::Error> {
+    fn try_into(self) -> Result<Uri, Self::Error> {
         match self {
             MessageAttributeValue::Uri(u) => Ok(u),
-            v => Ok(Url::parse(v.to_string().as_ref())?),
+            v => Ok(v.to_string().into_uri()?),
         }
     }
 }