Remove Option from Array values (fixes #57)

As mandated by the spec change in open-telemetry/opentelemetry-specification#1214.

opentelemetry-otlp/src/transform/common.rs

@@ -57,16 +57,13 @@ impl From<Value> for AnyValue {
     }
 }
 
-fn array_into_proto<T>(vals: Vec<Option<T>>) -> ArrayValue
+fn array_into_proto<T>(vals: Vec<T>) -> ArrayValue
 where
     Value: From<T>,
 {
     let values = RepeatedField::from_vec(
         vals.into_iter()
-            .map(|val| match val {
-                Some(v) => AnyValue::from(Value::from(v)),
-                None => AnyValue::new(),
-            })
+            .map(|val| AnyValue::from(Value::from(val)))
             .collect(),
     );
 

opentelemetry/src/api/core.rs

@@ -98,13 +98,13 @@ impl fmt::Display for Key {
 #[derive(Clone, Debug, PartialEq)]
 pub enum Array {
     /// Array of bools
-    Bool(Vec<Option<bool>>),
+    Bool(Vec<bool>),
     /// Array of integers
-    I64(Vec<Option<i64>>),
+    I64(Vec<i64>),
     /// Array of floats
-    F64(Vec<Option<f64>>),
+    F64(Vec<f64>),
     /// Array of strings
-    String(Vec<Option<Cow<'static, str>>>),
+    String(Vec<Cow<'static, str>>),
 }
 
 impl fmt::Display for Array {
@@ -119,55 +119,42 @@ impl fmt::Display for Array {
                     if i > 0 {
                         write!(fmt, ",")?;
                     }
-                    match t {
-                        Some(t) => write!(fmt, "{:?}", t)?,
-                        None => write!(fmt, "null")?,
-                    }
+                    write!(fmt, "{:?}", t)?;
                 }
                 write!(fmt, "]")
             }
         }
     }
 }
 
-fn display_array_str<T: fmt::Display>(
-    slice: &[Option<T>],
-    fmt: &mut fmt::Formatter<'_>,
-) -> fmt::Result {
+fn display_array_str<T: fmt::Display>(slice: &[T], fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
     write!(fmt, "[")?;
     for (i, t) in slice.iter().enumerate() {
         if i > 0 {
             write!(fmt, ",")?;
         }
-        match t {
-            Some(t) => write!(fmt, "{}", t)?,
-            None => write!(fmt, "null")?,
-        }
+        write!(fmt, "{}", t)?;
     }
     write!(fmt, "]")
 }
 
 macro_rules! into_array {
-    ($(($t:ty, $val:expr, $src:ident, $convert:expr),)+) => {
+    ($(($t:ty, $val:expr),)+) => {
         $(
             impl From<$t> for Array {
-                fn from($src: $t) -> Self {
-                    $val($convert)
+                fn from(t: $t) -> Self {
+                    $val(t)
                 }
             }
         )+
     }
 }
 
 into_array!(
-    (Vec<Option<bool>>, Array::Bool, t, t),
-    (Vec<Option<i64>>, Array::I64, t, t),
-    (Vec<Option<f64>>, Array::F64, t, t),
-    (Vec<Option<Cow<'static, str>>>, Array::String, t, t),
-    (Vec<bool>, Array::Bool, t, t.into_iter().map(Some).collect()),
-    (Vec<i64>, Array::I64, t, t.into_iter().map(Some).collect()),
-    (Vec<f64>, Array::F64, t, t.into_iter().map(Some).collect()),
-    (Vec<Cow<'static, str>>, Array::String, t, t.into_iter().map(Some).collect()),
+    (Vec<bool>, Array::Bool),
+    (Vec<i64>, Array::I64),
+    (Vec<f64>, Array::F64),
+    (Vec<Cow<'static, str>>, Array::String),
 );
 
 /// Value types for use in `KeyValue` pairs.

opentelemetry/src/api/labels/mod.rs

@@ -86,9 +86,7 @@ fn hash_value<H: Hasher>(state: &mut H, value: &Value) {
             // recursively hash array values
             Array::Bool(values) => values.iter().for_each(|v| v.hash(state)),
             Array::I64(values) => values.iter().for_each(|v| v.hash(state)),
-            Array::F64(values) => values
-                .iter()
-                .for_each(|v| v.map(|f| f.to_bits()).hash(state)),
+            Array::F64(values) => values.iter().for_each(|v| v.to_bits().hash(state)),
             Array::String(values) => values.iter().for_each(|v| v.hash(state)),
         },
     }