1147: Update logging to use `log`, add command line flag to toggle it r=MarkMcCaskey a=MarkMcCaskey
This PR:
- ports our logging to the [`log`](https://crates.io/crates/log) crate which is the de-facto standard way to do logging in Rust (it defines a trait which logging backends can implement (we can also implement our own at a later date using these traits)). Another benefit of using the standard logging utilities is that we can now allow users of our libraries to filter and display log messages from Wasmer in a more natural way.
- adds a command line flag to enable/disable logging
- updates the `debug` and `trace` features to pass the correct static toggles to the `log` crate; judging by the `log` documentation these features need to only be set once
- copies and slightly modifies our `fern` configuration from wapm
- updates the makefile so that `make release` compiles out all log statements
- TODO: update CI to not print with color (may not be necessary actually)
# Review
- [x] Add a short description of the the change to the CHANGELOG.md file
Here's some example output:
```
[1579035881.809 DEBUG wasmer_wasi::state] wasi::fs::inodes
[1579035881.809 DEBUG wasmer_wasi::state] wasi::fs::preopen_dirs
[1579035881.809 DEBUG wasmer_wasi::state] wasi::fs::mapped_dirs
[1579035881.809 DEBUG wasmer_wasi::state] wasi::fs::end
[1579035881.810 DEBUG wasmer_wasi::syscalls] wasi::fd_prestat_get: fd=3
[1579035881.810 DEBUG wasmer_wasi::state] in prestat_fd Fd { rights: 536870911, rights_inheriting: 536870911, flags: 0, offset: 0, open_flags: 1, inode: Index { index: 3, generation: 0 } }
[1579035881.810 DEBUG wasmer_wasi::syscalls] wasi::fd_prestat_dir_name: fd=3, path_len=2
[1579035881.810 DEBUG wasmer_wasi::syscalls] => result: "/"
[1579035881.810 DEBUG wasmer_wasi::syscalls] wasi::fd_fdstat_get: fd=3, buf_ptr=1048536
[1579035881.810 DEBUG wasmer_wasi::state] fdstat: Fd { rights: 536870911, rights_inheriting: 536870911, flags: 0, offset: 0, open_flags: 1, inode: Index { index: 3, generation: 0 } }
[1579035881.810 DEBUG wasmer_wasi::syscalls] wasi::fd_prestat_get: fd=4
[1579035881.810 DEBUG wasmer_wasi::syscalls] wasi::environ_sizes_get
[1579035881.810 DEBUG wasmer_wasi::syscalls] env_var_count: 0, env_buf_size: 0
[1579035881.810 DEBUG wasmer_wasi::syscalls] wasi::args_sizes_get
[1579035881.810 DEBUG wasmer_wasi::syscalls] => argc=3, argv_buf_size=92
[1579035881.810 DEBUG wasmer_wasi::syscalls] wasi::args_get
[1579035881.810 DEBUG wasmer_wasi::syscalls] => args:
0: /Users/mark/.wasmer/globals/wapm_packages/mark/rust-example@0.1.11/wasi-example.wasm
1: -e
2: HQ+
[1579035881.810 DEBUG wasmer_wasi::syscalls] wasi::args_sizes_get
[1579035881.811 DEBUG wasmer_wasi::syscalls] => argc=3, argv_buf_size=92
[1579035881.811 DEBUG wasmer_wasi::syscalls] wasi::args_get
[1579035881.811 DEBUG wasmer_wasi::syscalls] => args:
0: /Users/mark/.wasmer/globals/wapm_packages/mark/rust-example@0.1.11/wasi-example.wasm
1: -e
2: HQ+
[1579035881.811 DEBUG wasmer_wasi::syscalls] wasi::random_get buf_len: 16
[1579035881.811 DEBUG wasmer_wasi::syscalls] wasi::fd_write: fd=1
Hello, world!
[1579035881.811 DEBUG wasmer_wasi::syscalls] wasi::fd_write: fd=1
HQ+
```
Co-authored-by: Mark McCaskey <mark@wasmer.io>
1099: Remove backend::Backend from runtime-core r=syrusakbary a=syrusakbary
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# Description
This PR removes the dependency of a Backend in runtime-core. So it's agnostic and more backends can be plugged in easily.
Why this is important?
* By removing backends from wasmer-runtime-core we can make the runtime agnostic, so anyone can plug their own backend into Wasmer without needing to touch the main source code (V8, JavascriptCore, wasm3, ...).
* It simplifies the codebase and avoids code leaks from the backend to the runtime API.
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# Review
- [x] Add a short description of the the change to the CHANGELOG.md file
Co-authored-by: Syrus <me@syrusakbary.com>
Co-authored-by: Syrus Akbary <me@syrusakbary.com>
Co-authored-by: Mark McCaskey <mark@wasmer.io>
Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
