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use std::collections::BTreeMap;
use std::path::{PathBuf, Path};
use std::io::{self, Read, Write};
use std::fs::{self, File};
use handlebars::Handlebars;
use walkdir::WalkDir;
use mime_guess::{Mime, guess_mime_type};
use cargo_shim::{
TargetKind,
CargoPackage,
CargoTarget,
CargoResult
};
use error::Error;
use utils::read_bytes;
const DEFAULT_INDEX_HTML_TEMPLATE: &'static str = r#"<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=1" name="viewport" />
<script>
var Module = {};
var __cargo_web = {};
Object.defineProperty( Module, 'canvas', {
get: function() {
if( __cargo_web.canvas ) {
return __cargo_web.canvas;
}
var canvas = document.createElement( 'canvas' );
document.querySelector( 'body' ).appendChild( canvas );
__cargo_web.canvas = canvas;
return canvas;
}
});
</script>
</head>
<body>
<script src="{{{js_url}}}"></script>
</body>
</html>"#;
fn generate_index_html( filename: &str ) -> String {
let handlebars = Handlebars::new();
let mut template_data = BTreeMap::new();
template_data.insert( "js_url", filename.to_owned() );
handlebars.render_template( DEFAULT_INDEX_HTML_TEMPLATE, &template_data ).unwrap()
}
enum RouteKind {
Blob( Vec< u8 > ),
StaticDirectory( PathBuf )
}
struct Route {
key: String,
kind: RouteKind,
can_be_deployed: bool
}
pub struct Deployment {
routes: Vec< Route >
}
pub enum ArtifactKind {
Data( Vec< u8 > ),
File( File )
}
pub struct Artifact {
pub mime_type: Mime,
pub kind: ArtifactKind
}
impl Artifact {
pub fn map_text< F: FnOnce( String ) -> String >( self, callback: F ) -> io::Result< Self > {
let mime_type = self.mime_type;
let data = match self.kind {
ArtifactKind::Data( data ) => data,
ArtifactKind::File( mut fp ) => {
let mut data = Vec::new();
fp.read_to_end( &mut data )?;
data
}
};
let mut text = String::from_utf8_lossy( &data ).into_owned();
text = callback( text );
let data = text.into();
Ok( Artifact {
mime_type,
kind: ArtifactKind::Data( data )
})
}
}
impl Deployment {
pub fn new( package: &CargoPackage, target: &CargoTarget, result: &CargoResult ) -> Result< Self, Error > {
let crate_static_path = package.crate_root.join( "static" );
let target_static_path = match target.kind {
TargetKind::Example => Some( target.source_directory.join( format!( "{}-static", target.name ) ) ),
TargetKind::Bin => Some( target.source_directory.join( "static" ) ),
_ => None
};
let js_name = format!( "{}.js", target.name );
let mut routes = Vec::new();
for path in result.artifacts() {
let (is_js, key) = match path.extension() {
Some( ext ) if ext == "js" => (true, js_name.clone()),
Some( ext ) if ext == "wasm" => (false, path.file_name().unwrap().to_string_lossy().into_owned()),
_ => continue
};
let contents = match read_bytes( &path ) {
Ok( contents ) => contents,
Err( error ) => return Err( Error::CannotLoadFile( path.clone(), error ) )
};
if is_js {
routes.push( Route {
key: "js/app.js".to_owned(),
kind: RouteKind::Blob( contents.clone() ),
can_be_deployed: false
});
}
routes.push( Route {
key,
kind: RouteKind::Blob( contents ),
can_be_deployed: true
});
}
if let Some( target_static_path ) = target_static_path {
routes.push( Route {
key: "".to_owned(),
kind: RouteKind::StaticDirectory( target_static_path.to_owned() ),
can_be_deployed: true
});
}
routes.push( Route {
key: "".to_owned(),
kind: RouteKind::StaticDirectory( crate_static_path.to_owned() ),
can_be_deployed: true
});
routes.push( Route {
key: "index.html".to_owned(),
kind: RouteKind::Blob( generate_index_html( &js_name ).into() ),
can_be_deployed: true
});
Ok( Deployment {
routes
})
}
pub fn js_url( &self ) -> &str {
let route = self.routes.iter().find( |route| route.can_be_deployed && route.key.ends_with( ".js" ) ).unwrap();
&route.key
}
pub fn get_by_url( &self, mut url: &str ) -> Option< Artifact > {
if url.starts_with( "/" ) {
url = &url[ 1.. ];
}
if url == "" {
url = "index.html";
}
let mime_type = guess_mime_type(url);
for route in &self.routes {
match route.kind {
RouteKind::Blob( ref bytes ) => {
if url != route.key {
continue;
}
trace!( "Get by URL of {:?}: found blob", url );
return Some( Artifact {
mime_type,
kind: ArtifactKind::Data( bytes.clone() )
});
},
RouteKind::StaticDirectory( ref path ) => {
let mut target_path = path.clone();
for chunk in url.split( "/" ) {
target_path = target_path.join( chunk );
}
trace!( "Get by URL of {:?}: path {:?} exists: {}", url, target_path, target_path.exists() );
if target_path.exists() {
match File::open( &target_path ) {
Ok( fp ) => {
return Some( Artifact {
mime_type,
kind: ArtifactKind::File( fp )
});
},
Err( error ) => {
warn!( "Cannot open {:?}: {:?}", target_path, error );
return None;
}
}
}
}
}
}
trace!( "Get by URL of {:?}: not found", url );
None
}
pub fn deploy_to( &self, root_directory: &Path ) -> Result< (), Error > {
for route in &self.routes {
if !route.can_be_deployed {
continue;
}
match route.kind {
RouteKind::Blob( ref bytes ) => {
let mut target_path = root_directory.to_owned();
for chunk in route.key.split( "/" ) {
target_path = target_path.join( chunk );
}
if target_path.exists() {
continue;
}
let target_dir = target_path.parent().unwrap();
fs::create_dir_all( target_dir )
.map_err( |err| Error::CannotCreateFile( target_dir.to_owned(), err ) )?;
let mut fp = File::create( &target_path ).map_err( |err| Error::CannotCreateFile( target_path.to_owned(), err ) )?;
fp.write_all( &bytes ).map_err( |err| Error::CannotWriteToFile( target_path.to_owned(), err ) )?;
},
RouteKind::StaticDirectory( ref source_dir ) => {
if !source_dir.exists() {
continue;
}
for entry in WalkDir::new( source_dir ) {
let entry = entry.map_err( |err| {
let err_path = err.path().map( |path| path.to_owned() ).unwrap_or_else( || source_dir.clone() );
let err: io::Error = err.into();
Error::CannotLoadFile( err_path, err )
})?;
let source_path = entry.path();
let relative_path = source_path.strip_prefix( source_dir ).unwrap();
let target_path = root_directory.join( relative_path );
if target_path.exists() {
continue;
}
if source_path.is_dir() {
fs::create_dir_all( &target_path )
.map_err( |err| Error::CannotCreateFile( target_path.to_owned(), err ) )?;
continue;
}
let target_dir = target_path.parent().unwrap();
fs::create_dir_all( target_dir )
.map_err( |err| Error::CannotCreateFile( target_dir.to_owned(), err ) )?;
fs::copy( &source_path, &target_path )
.map_err( |err| Error::CannotCopyFile( source_path.to_owned(), target_path.to_owned(), err ) )?;
}
}
}
}
Ok(())
}
}