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Brings back `read_buf` from 0.2. This will be stabilized as part of 1.0.
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This changes `ReadBuf::add_filled` to `ReadBuf::advance` and
`ReadBuf::append` to `ReadBuf::put_slice`. This is just a
mechanical change.
Closes #2769
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Works towards #2716. Changes the argument to `AsyncRead::poll_read` to
take a `ReadBuf` struct that safely manages writes to uninitialized memory.
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`AsyncRead` is safe to implement but can be implemented so that it
reports that it read more bytes than it actually did. `poll_read_buf` on
the other head implicitly trusts that the returned length is actually
correct which makes it possible to advance the buffer past what has
actually been initialized.
An alternative fix could be to avoid the panic and instead advance by
`n.min(b.len())`
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Changes the set of `default` feature flags to `[]`. By default, only
core traits are included without specifying feature flags. This makes it
easier for users to pick the components they need.
For convenience, a `full` feature flag is included that includes all
components.
Tests are configured to require the `full` feature. Testing individual
feature flags will need to be moved to a separate crate.
Closes #1791
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A step towards collapsing Tokio sub crates into a single `tokio`
crate (#1318).
The `io` implementation is now provided by the main `tokio` crate.
Functionality can be opted out of by using the various net related
feature flags.
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Utilities are made optional with a feature flag.
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This simplifies the test
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Refs: #1203
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