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Code Issues Projects Releases Wiki Activity

Better error handling

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FliegendeWurst 2020-04-25 09:33:21 +02:00
parent 137c1ff113
commit e8e81eeb0f
1 changed files with 126 additions and 112 deletions
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222
src/main.rs
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@ -137,93 +137,92 @@ impl Object {
}
}
fn from_link(item: ElementRef, link: ElementRef) -> Self {
fn from_link(item: ElementRef, link: ElementRef) -> Result<Self> {
let mut name = link.text().collect::<String>().replace('/', "-").trim().to_owned();
let mut url = URL::from_href(link.value().attr("href").unwrap());
let mut url = URL::from_href(link.value().attr("href").ok_or::<Error>("link missing href".into())?);
if url.thr_pk.is_some() {
return Thread {
return Ok(Thread {
url
};
});
}
if url.url.starts_with("https://ilias.studium.kit.edu/goto.php") {
if url.target.as_ref().map(|x| x.starts_with("wiki_")).unwrap_or(false) {
return Wiki {
return Ok(Wiki {
name,
url // TODO: insert ref_id here
};
});
}
if url.target.as_ref().map(|x| x.starts_with("root_")).unwrap_or(false) {
// magazine link
return Generic {
return Ok(Generic {
name,
url
};
});
}
if url.target.as_ref().map(|x| x.starts_with("crs_")).unwrap_or(false) {
let ref_id = url.target.as_ref().unwrap().split('_').nth(1).unwrap();
url.ref_id = ref_id.to_owned();
return Course {
return Ok(Course {
name,
url
};
});
}
if url.target.as_ref().map(|x| x.starts_with("frm_")).unwrap_or(false) {
// TODO: extract post link? (however, this codepath should only be hit when parsing the content tree)
// TODO: extract post link? (this codepath should only be hit when parsing the content tree)
let ref_id = url.target.as_ref().unwrap().split('_').nth(1).unwrap();
url.ref_id = ref_id.to_owned();
return Forum {
return Ok(Forum {
name,
url
};
});
}
if url.target.as_ref().map(|x| x.starts_with("lm_")).unwrap_or(false) {
// fancy interactive task
return Generic {
return Ok(Generic {
name,
url
};
});
}
if url.target.as_ref().map(|x| x.starts_with("fold_")).unwrap_or(false) {
let ref_id = url.target.as_ref().unwrap().split('_').nth(1).unwrap();
url.ref_id = ref_id.to_owned();
return Folder {
return Ok(Folder {
name,
url
};
});
}
if url.target.as_ref().map(|x| x.starts_with("file_")).unwrap_or(false) {
let target = url.target.as_ref().unwrap();
let target = url.target.as_ref().ok_or("no download target")?;
if !target.ends_with("download") {
// download page containing metadata
// TODO: perhaps process that? not really needed since it'll be in a folder anyway
return Generic {
return Ok(Generic {
name,
url
};
});
} else {
let item_prop = Selector::parse("span.il_ItemProperty").unwrap();
let mut item_props = item.select(&item_prop);
let ext = item_props.next().unwrap();
let version = item_props.nth(1).unwrap().text().collect::<String>();
let ext = item_props.next().ok_or("cannot find file extension")?;
let version = item_props.nth(1).ok_or("cannot find 3rd file metadata")?.text().collect::<String>();
let version = version.trim();
if version.starts_with("Version: ") {
name.push_str("_v");
name.push_str(&version[9..]);
}
return File { name: format!("{}.{}", name, ext.text().collect::<String>().trim()), url };
return Ok(File { name: format!("{}.{}", name, ext.text().collect::<String>().trim()), url });
}
}
return Generic { name, url };
return Ok(Generic { name, url });
}
if url.cmd.as_ref().map(|x| &**x) == Some("showThreads") {
return Forum { name, url };
return Ok(Forum { name, url });
}
// class name is *sometimes* in CamelCase
match &*url.baseClass.to_ascii_lowercase() {
Ok(match &*url.baseClass.to_ascii_lowercase() {
"ilexercisehandlergui" => ExerciseHandler { name, url },
"ililwikihandlergui" => Wiki { name, url },
"ilrepositorygui" => match url.cmd.as_deref() {
@ -233,7 +232,7 @@ impl Object {
},
"ilobjplugindispatchgui" => PluginDispatch { name, url },
_ => Generic { name, url }
}
})
}
}
@ -270,7 +269,11 @@ impl URL {
}
fn from_href(href: &str) -> Self {
let url = Url::parse(&format!("http://domain/{}", href)).unwrap();
let url = if !href.starts_with(ILIAS_URL) {
Url::parse(&format!("http://domain/{}", href)).unwrap()
} else {
Url::parse(href).unwrap()
};
let mut baseClass = String::new();
let mut cmdClass = None;
let mut cmdNode = None;
@ -320,7 +323,10 @@ impl ILIAS {
.build()?;
// load .iliasignore file
opt.output.push(".iliasignore");
let ignore = Gitignore::new(&opt.output).0; // ignore errors
let (ignore, error) = Gitignore::new(&opt.output);
if let Some(err) = error {
println!("Warning: .iliasignore error: {}", err);
}
opt.output.pop();
let this = ILIAS {
opt, client, user, pass, ignore
@ -356,39 +362,30 @@ impl ILIAS {
login_soup = BeautifulSoup(otp_response.text, 'lxml')
*/
let saml = Selector::parse(r#"input[name="SAMLResponse"]"#).unwrap();
let saml = dom.select(&saml).next().ok_or::<ErrorKind>("no SAML response, incorrect password?".into())?;
let saml = dom.select(&saml).next().ok_or::<Error>("no SAML response, incorrect password?".into())?;
let relay_state = Selector::parse(r#"input[name="RelayState"]"#).unwrap();
let relay_state = dom.select(&relay_state).next().ok_or::<ErrorKind>("no relay state".into())?;
let relay_state = dom.select(&relay_state).next().ok_or::<Error>("no relay state".into())?;
println!("Logging into ILIAS..");
this.client
.post("https://ilias.studium.kit.edu/Shibboleth.sso/SAML2/POST")
.form(&json!({
"SAMLResponse": saml.value().attr("value").unwrap(),
"RelayState": relay_state.value().attr("value").unwrap()
"SAMLResponse": saml.value().attr("value").ok_or("no SAML value")?,
"RelayState": relay_state.value().attr("value").ok_or("no RelayState value")?
}))
.send().await?;
println!("Logged in!");
Ok(this)
}
async fn personal_desktop(&self) -> Result<Dashboard> {
let html = self.get_html("https://ilias.studium.kit.edu/ilias.php?baseClass=ilPersonalDesktopGUI&cmd=jumpToSelectedItems").await?;
let items = ILIAS::get_items(&html).into_iter().flat_map(Result::ok).collect();
Ok(Dashboard {
items
})
async fn download(&self, url: &str) -> Result<reqwest::Response> {
if self.opt.verbose > 1 {
println!("Downloading {}", url);
}
if url.starts_with("http") || url.starts_with("ilias.studium.kit.edu") {
Ok(self.client.get(url).send().await?)
} else {
Ok(self.client.get(&format!("{}{}", ILIAS_URL, url)).send().await?)
}
fn get_items(html: &Html) -> Vec<Result<Object>> {
let container_items = Selector::parse("div.il_ContainerListItem").unwrap();
let container_item_title = Selector::parse("a.il_ContainerItemTitle").unwrap();
html.select(&container_items).map(|item| {
item
.select(&container_item_title)
.next()
.map(|link| Object::from_link(item, link))
.ok_or::<Error>("can't find link".into())
}).collect()
}
async fn get_html(&self, url: &str) -> Result<Html> {
@ -411,11 +408,31 @@ impl ILIAS {
}
}
fn get_items(html: &Html) -> Vec<Result<Object>> {
let container_items = Selector::parse("div.il_ContainerListItem").unwrap();
let container_item_title = Selector::parse("a.il_ContainerItemTitle").unwrap();
html.select(&container_items).map(|item| {
item
.select(&container_item_title)
.next()
.map(|link| Object::from_link(item, link))
.unwrap_or_else(|| Err("can't find link".into()))
}).collect()
}
async fn get_course_content(&self, url: &URL) -> Result<Vec<Result<Object>>> {
let html = self.get_html(&url.url).await?;
Ok(ILIAS::get_items(&html))
}
async fn personal_desktop(&self) -> Result<Dashboard> {
let html = self.get_html("https://ilias.studium.kit.edu/ilias.php?baseClass=ilPersonalDesktopGUI&cmd=jumpToSelectedItems").await?;
let items = ILIAS::get_items(&html).into_iter().flat_map(Result::ok).collect();
Ok(Dashboard {
items
})
}
async fn get_course_content_tree(&self, ref_id: &str, cmd_node: &str) -> Result<Vec<Object>> {
// TODO: this magically does not return sub-folders
// opening the same url in browser does show sub-folders?!
@ -423,9 +440,6 @@ impl ILIAS {
"{}ilias.php?ref_id={}&cmdClass=ilobjcoursegui&cmd=showRepTree&cmdNode={}&baseClass=ilRepositoryGUI&cmdMode=asynch&exp_cmd=getNodeAsync&node_id=exp_node_rep_exp_{}&exp_cont=il_expl2_jstree_cont_rep_exp&searchterm=",
ILIAS_URL, ref_id, cmd_node, ref_id
);
if self.opt.verbose > 0 {
println!("Loading {:?}..", url);
}
let html = self.get_html_fragment(&url).await?;
let mut items = Vec::new();
for link in html.select(&a) {
@ -434,27 +448,17 @@ impl ILIAS {
// disabled course
continue;
}
items.push(Object::from_link(link, link));
items.push(Object::from_link(link, link)?);
}
Ok(items)
}
async fn download(&self, url: &str) -> Result<reqwest::Response> {
if self.opt.verbose > 1 {
println!("Downloading {}", url);
}
if url.starts_with("http") || url.starts_with("ilias.studium.kit.edu") {
Ok(self.client.get(url).send().await?)
} else {
Ok(self.client.get(&format!("{}{}", ILIAS_URL, url)).send().await?)
}
}
}
#[tokio::main]
async fn main() {
let opt = Opt::from_args();
// need this because error handling is WIP
// need this because task scheduling is WIP
// (would wait forever on paniced task)
*PANIC_HOOK.lock() = panic::take_hook();
panic::set_hook(Box::new(|info| {
*TASKS_RUNNING.lock() -= 1;
@ -462,9 +466,9 @@ async fn main() {
PANIC_HOOK.lock()(info);
}));
let user = rprompt::prompt_reply_stdout("Username: ").unwrap();
let pass = rpassword::read_password_from_tty(Some("Password: ")).unwrap();
let ilias = match ILIAS::login::<_, String>(opt, user, pass).await {
let user = rprompt::prompt_reply_stdout("Username: ").expect("username prompt");
let pass = rpassword::read_password_from_tty(Some("Password: ")).expect("password prompt");
let ilias = match ILIAS::login(opt, user, pass).await {
Ok(ilias) => ilias,
Err(e) => {
print!("{}", e.display_chain());
@ -473,11 +477,14 @@ async fn main() {
};
if ilias.opt.content_tree {
// need this to get the content tree
// TODO error handling
let _ = ilias.client.get("https://ilias.studium.kit.edu/ilias.php?baseClass=ilRepositoryGUI&cmd=frameset&set_mode=tree&ref_id=1").send().await;
if let Err(e) = ilias.client.get("https://ilias.studium.kit.edu/ilias.php?baseClass=ilRepositoryGUI&cmd=frameset&set_mode=tree&ref_id=1").send().await {
println!("Warning: could not enable content tree: {}", e);
}
}
let ilias = Arc::new(ilias);
let desktop = ilias.personal_desktop().await.unwrap();
let desktop = ilias.personal_desktop().await;
match desktop {
Ok(desktop) => {
for item in desktop.items {
let mut path = ilias.opt.output.clone();
path.push(item.name());
@ -486,6 +493,9 @@ async fn main() {
process_gracefully(ilias, path, item).await;
});
}
},
Err(e) => println!("Error getting personal desktop: {}", e.display_chain())
}
// TODO: do this with tokio
// https://github.com/tokio-rs/tokio/issues/2039
while *TASKS_QUEUED.lock() > 0 {
@ -493,8 +503,9 @@ async fn main() {
}
if ilias.opt.content_tree {
// restore fast page loading times
// TODO error handling
let _ = ilias.client.get("https://ilias.studium.kit.edu/ilias.php?baseClass=ilRepositoryGUI&cmd=frameset&set_mode=flat&ref_id=1").send().await;
if let Err(e) = ilias.client.get("https://ilias.studium.kit.edu/ilias.php?baseClass=ilRepositoryGUI&cmd=frameset&set_mode=flat&ref_id=1").send().await {
println!("Warning: could not disable content tree: {}", e);
}
}
}
@ -529,6 +540,7 @@ mod selectors {
pub static ref a: Selector = Selector::parse("a").unwrap();
pub static ref a_target_blank: Selector = Selector::parse(r#"a[target="_blank"]"#).unwrap();
pub static ref table: Selector = Selector::parse("table").unwrap();
pub static ref video_tr: Selector = Selector::parse(".ilTableOuter > div > table > tbody > tr").unwrap();
pub static ref links_in_table: Selector = Selector::parse("tbody tr td a").unwrap();
pub static ref td: Selector = Selector::parse("td").unwrap();
pub static ref tr: Selector = Selector::parse("tr").unwrap();
@ -649,9 +661,10 @@ fn process(ilias: Arc<ILIAS>, path: PathBuf, obj: Object) -> impl std::future::F
let data = ilias.download(&list_url);
let html = data.await?.text().await?;
let html = Html::parse_fragment(&html);
for row in html.select(&tr) {
for row in html.select(&video_tr) {
let link = row.select(&a_target_blank).next();
if link.is_none() {
println!("Warning: table row without link in {}", url.url);
continue;
}
let link = link.unwrap();
@ -668,7 +681,7 @@ fn process(ilias: Arc<ILIAS>, path: PathBuf, obj: Object) -> impl std::future::F
println!("Found video: {}", title);
}
let video = Video {
url: URL::raw(link.value().attr("href").unwrap().to_owned())
url: URL::raw(link.value().attr("href").ok_or("video link without href")?.to_owned())
};
let ilias = Arc::clone(&ilias);
task::spawn(async {
@ -699,17 +712,21 @@ fn process(ilias: Arc<ILIAS>, path: PathBuf, obj: Object) -> impl std::future::F
}
let json: serde_json::Value = {
let mut json_capture = XOCT_REGEX.captures_iter(&html);
let json = &json_capture.next().ok_or::<ErrorKind>("xoct player json not found".into())?[1];
let json = &json_capture.next().ok_or::<Error>("xoct player json not found".into())?[1];
if ilias.opt.verbose > 1 {
println!("{}", json);
}
let json = json.split(",\n").nth(0).ok_or::<ErrorKind>("invalid xoct player json".into())?;
let json = json.split(",\n").nth(0).ok_or::<Error>("invalid xoct player json".into())?;
serde_json::from_str(&json.trim())?
};
if ilias.opt.verbose > 1 {
println!("{}", json);
}
let url = json["streams"][0]["sources"]["mp4"][0]["src"].as_str().unwrap();
let url = json
.pointer("/streams/0/sources/mp4/0/src")
.map(|x| x.as_str())
.ok_or("video src not found")?
.ok_or("video src not string")?;
let resp = ilias.download(&url).await?;
let mut reader = stream_reader(resp.bytes_stream().map_err(|x| {
io::Error::new(io::ErrorKind::Other, x)
@ -735,13 +752,12 @@ fn process(ilias: Arc<ILIAS>, path: PathBuf, obj: Object) -> impl std::future::F
let url = {
let html = Html::parse_document(&html_text);
//https://ilias.studium.kit.edu/ilias.php?ref_id=122&cmdClass=ilobjforumgui&frm_tt_e39_122_trows=800&cmd=showThreads&cmdNode=uf:lg&baseClass=ilrepositorygui
let url = html
html
.select(&a)
.flat_map(|x| x.value().attr("href"))
.filter(|x| x.contains("trows=800"))
.next()
.ok_or::<ErrorKind>("can't find forum thread count selector (empty forum?)".into())?;
format!("{}{}", ILIAS_URL, url)
.ok_or::<Error>("can't find forum thread count selector (empty forum?)".into())?.to_owned()
};
let data = ilias.download(&url);
let html = data.await?.text().await?;
@ -750,13 +766,14 @@ fn process(ilias: Arc<ILIAS>, path: PathBuf, obj: Object) -> impl std::future::F
for row in html.select(&tr) {
let cells = row.select(&td).collect::<Vec<_>>();
if cells.len() != 6 {
println!("Warning: unusual table row ({} cells) in {}", cells.len(), url);
continue;
}
let link = cells[1].select(&a).next().ok_or::<ErrorKind>("thread link not found".into())?;
let object = Object::from_link(link, link);
let link = cells[1].select(&a).next().ok_or::<Error>("thread link not found".into())?;
let object = Object::from_link(link, link)?;
let mut path = path.clone();
let name = format!("{}_{}",
object.url().thr_pk.as_ref().ok_or::<ErrorKind>("thr_pk not found for thread".into())?,
object.url().thr_pk.as_ref().ok_or::<Error>("thr_pk not found for thread".into())?,
link.text().collect::<String>().replace('/', "-").trim()
);
path.push(name);
@ -767,7 +784,7 @@ fn process(ilias: Arc<ILIAS>, path: PathBuf, obj: Object) -> impl std::future::F
Err(_) => 0
}
};
let available_posts = cells[3].text().next().unwrap().trim().parse::<usize>().chain_err(|| "parsing post count failed")?;
let available_posts = cells[3].text().next().unwrap_or_default().trim().parse::<usize>().chain_err(|| "parsing post count failed")?;
if available_posts <= saved_posts && !ilias.opt.force {
continue;
}
@ -778,7 +795,7 @@ fn process(ilias: Arc<ILIAS>, path: PathBuf, obj: Object) -> impl std::future::F
});
}
if html.select(&forum_pages).count() > 0 {
println!("Ignoring older threads (801st+) in {:?}..", path);
println!("Ignoring older threads in {:?}..", path);
}
},
Thread { url } => {
@ -790,19 +807,16 @@ fn process(ilias: Arc<ILIAS>, path: PathBuf, obj: Object) -> impl std::future::F
Err(e)?;
}
}
let url = format!("{}{}", ILIAS_URL, url.url);
let data = ilias.download(&url);
let html = data.await?.text().await?;
let html = Html::parse_document(&html);
let html = ilias.get_html(&url.url).await?;
for post in html.select(&post_row) {
let title = post.select(&post_title).next().unwrap().text().collect::<String>().replace('/', "-");
let author = post.select(&span_small).next().unwrap();
let title = post.select(&post_title).next().ok_or("post title not found")?.text().collect::<String>().replace('/', "-");
let author = post.select(&span_small).next().ok_or("post author not found")?;
let author = author.text().collect::<String>();
let author = author.trim().split('|').nth(1).unwrap().trim();
let container = post.select(&post_container).next().unwrap();
let link = container.select(&a).next().unwrap();
let name = format!("{}_{}_{}.html", link.value().attr("name").unwrap(), author, title.trim());
let data = post.select(&post_content).next().unwrap();
let author = author.trim().split('|').nth(1).ok_or("author data in unknown format")?.trim();
let container = post.select(&post_container).next().ok_or("post container not found")?;
let link = container.select(&a).next().ok_or("post link not found")?;
let name = format!("{}_{}_{}.html", link.value().attr("name").ok_or("post name in link not found")?, author, title.trim());
let data = post.select(&post_content).next().ok_or("post content not found")?;
let data = data.inner_html();
let mut path = path.clone();
path.push(name);
@ -818,12 +832,12 @@ fn process(ilias: Arc<ILIAS>, path: PathBuf, obj: Object) -> impl std::future::F
}
let file = AsyncFile::create(&path).await;
if file.is_err() {
println!("Error creating file {:?}: {:?}", path, file.err().unwrap());
println!("Error creating file {:?}: {}", path, file.err().unwrap());
return;
}
let mut file = BufWriter::new(file.unwrap());
if let Err(e) = tokio::io::copy(&mut data.as_bytes(), &mut file).await {
println!("Error writing to {:?}: {:?}", path, e);
println!("Error writing to {:?}: {}", path, e);
}
*TASKS_RUNNING.lock() -= 1;
*TASKS_QUEUED.lock() -= 1;
@ -837,20 +851,20 @@ fn process(ilias: Arc<ILIAS>, path: PathBuf, obj: Object) -> impl std::future::F
// not last page yet
let ilias = Arc::clone(&ilias);
let next_page = Thread {
url: URL::from_href(last.value().attr("href").unwrap())
url: URL::from_href(last.value().attr("href").ok_or("page link not found")?)
};
task::spawn(async move {
process_gracefully(ilias, path, next_page).await;
});
}
} else {
println!("error: unable to find pagination links");
println!("Warning: unable to find pagination links in {}", url.url);
}
}
},
o => {
if ilias.opt.verbose > 0 {
println!("ignoring {:#?}", o)
println!("ignoring {:?}", o)
}
}
}