Crate hydroflow

Hydroflow is a low-level dataflow-based runtime system for the Hydro Project.

The primary item in this crate is the Hydroflow struct, representing a Hydroflow dataflow graph. Although this graph can be manually constructed, the easiest way to instantiate a Hydroflow instance is with the hydroflow_syntax! macro using Hydroflow’s custom “surface syntax.”

let mut hf = hydroflow::hydroflow_syntax! {
    source_iter(["hello", "world"]) -> for_each(|s| println!("{}", s));
};
hf.run_available();

For more examples, check out the examples folder on Github.

Re-exports

• pub use hydroflow_lang as lang;
• pub use variadics;
• pub use bincode;
• pub use bytes;
• pub use futures;
• pub use itertools;
• pub use lattices;
• pub use pusherator;
• pub use rustc_hash;
• pub use serde;
• pub use serde_json;
• pub use tokio;
• pub use tokio_stream;
• pub use tokio_util;
• pub use tracing;
• pub use web_time;

Modules

• compiled
  Hydroflow’s inner (intra-subgraph) compiled layer.
• scheduled
  Hydroflow’s outer scheduled layer. Deals with inter-subgraph runtime data-passing and scheduling.
• util
  Helper utilities for the Hydroflow surface syntax.

Macros

• assert_var_impl
  Asserts that the variable’s type implements the given traits.
• datalog
  Generate a Hydroflow instance from Datalog code.
• hydroflow_expect_warnings
  Tests that the given warnings are emitted by the hydroflow macro invocation.
• hydroflow_parser
  Parse Hydroflow “surface syntax” without emitting code.
• hydroflow_syntax
  Create a Hydroflow instance using Hydroflow’s custom “surface syntax.”
• hydroflow_syntax_noemit
  hydroflow_syntax! but will not emit any diagnostics (errors, warnings, etc.).
• launch
• monotonic_fn
  Checks that the given closure is a monotonic function. For now does nothing.
• morphism
  Checks that the given closure is a morphism. For now does nothing.
• rassert
  assert! but returns a [Result<(), String>] instead of panicking.
• rassert_eq
  assert_eq! but returns a [Result<(), String>] instead of panicking.
• var_args
  Variadic patterns macro.
• var_expr
  Variadic expressions (values) macro.
• var_type
  Variadic types macro.

Type Aliases

• Never
  Stand-in for the nightly “never” type !

Attribute Macros

• main
• test

Derive Macros

• DemuxEnum