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Eliza Weisman 8bd4d90e78 meta: consolidate & clean up crates (#323 )

## Motivation

`tracing` currently consists of a large number of crates. The number of
crates has the potential to be quite intimidating to users. 

## Solution

This branch makes the following changes:

 - Delete `tracing-fmt`. This crate's functionality has already been
   moved into `tracing-subscriber`, and a final version has been
   published to deprecate the crate & link to the code's new home.
 - Delete `tracing-tower-http`, as this functionality is now subsumed
   by `tracing-tower`. Since the crate was never published, we do not 
   need to deprecate it.
 - Delete `tracing-slog`. This crate was never implemented, so we can
   just remove it from the repository. It can be re-created if we ever
   implement `slog` integration.
 - Move `tracing-env-logger` into a `tracing-log` module, and feature 
   flag it. I updated some of the APIs as well.
 - Remove deleted crates from documentation.

This makes most of the changes discussed in #308.

Closes #308

Signed-off-by: Eliza Weisman <eliza@buoyant.io>

2019-09-04 13:20:35 -07:00

examples

meta: consolidate & clean up crates (#323 )

2019-09-04 13:20:35 -07:00

Cargo.toml

meta: consolidate & clean up crates (#323 )

2019-09-04 13:20:35 -07:00

README.md

chore: move examples to a central crate (#316 )

2019-09-03 13:35:29 -07:00

README.md

Tracing Examples

This directory contains a collection of examples that demonstrate the use of the tracing ecosystem:

tracing:
- counters: Implements a very simple metrics system to demonstrate how subscribers can consume field values as typed data.
- sloggish: A demo Subscriber implementation that mimics the output of slog-term's Compact formatter.
tracing-attributes:
- attrs-basic: A simple example of the #[instrument] attribute.
- attrs-args: An example implementing a simple recursive calculation of Fibbonacci numbers, to demonstrate how the #[instrument] attribute can record function arguments.
tracing-subscriber:
- fmt: Demonstrates the use of the fmt module in tracing-subscriber, which provides a subscriber implementation that logs traces to the console.
- fmt-stderr: Demonstrates overriding the output stream used by the fmt subscriber.
- subscriber-filter: Demonstrates the tracing-subscriber::filter module, which provides a layer which adds configurable filtering to a subscriber implementation.
- tower-load: Demonstrates how dynamically reloadable filters can be used to debug a server under load in production.
tracing-futures:
- futures-proxy-server: Demonstrates the use of tracing-futures by implementing a simple proxy server, based on this example from tokio.
- futures-spawn: A simple demonstration of the relationship between the spans representing spawned futures.
tracing-tower:
- tower-h2-client: Demonstrates the use of tracing-tower to instrument a simple tower-h2 HTTP/2 client (based on this example from tower-h2).
- tower-h2-server: Demonstrates the use of tracing-tower to instrument a simple tower-h2 HTTP/2 server (based on this example from tower-h2).
tracing-serde:
- serde-yak-shave: Demonstrates the use of tracing-serde by implementing a subscriber that emits trace output as JSON.
tracing-log:
- hyper-echo: Demonstrates how tracing-log can be used to record unstructured logs from dependencies as tracing events, by instrumenting this example from hyper, and using tracing-log to record logs emitted by hyper.

The nightly-examples directory contains examples of how tracing can be used with async/await. These are kept separate as async/await is currently only available on nightly Rust toolchains.