use std::{    collections::{HashMap, VecDeque},    hash::{DefaultHasher, Hasher},    sync::{        OnceLock, RwLock,        atomic::{AtomicU8, Ordering},    },    usize,}; use crate::{SCOPE_DEPTH_MAX, SCOPE_STRING_SEP_STR, Scope, ScopeAlloc, env_config}; use log; static ENV_FILTER: OnceLock<env_config::EnvFilter> = OnceLock::new();static SCOPE_MAP: RwLock<Option<GlobalScopeMap>> = RwLock::new(None);struct GlobalScopeMap {    map: ScopeMap,    hash: u64,} const LEVEL_ENABLED_MAX_DEFAULT: log::LevelFilter = log::LevelFilter::Info;/// The maximum log level of verbosity that is enabled by default./// All messages more verbose than this level will be discarded/// by default unless specially configured.////// This is used instead of the `log::max_level` as we need to tell the `log`/// crate that the max level is everything, so that we can dynamically enable/// logs that are more verbose than this level without the `log` crate throwing/// them away before we see themstatic mut LEVEL_ENABLED_MAX_STATIC: log::LevelFilter = LEVEL_ENABLED_MAX_DEFAULT; /// A cache of the true maximum log level that _could_ be printed. This is based/// on the maximally verbose level that is configured by the user, and is used/// to filter out logs more verbose than any configured level.////// E.g. if `LEVEL_ENABLED_MAX_STATIC `is 'info' but a user has configured some/// scope to print at a `debug` level, then this will be `debug`, and all/// `trace` logs will be discarded./// Therefore, it should always be `>= LEVEL_ENABLED_MAX_STATIC`// PERF: this doesn't need to be an atomic, we don't actually care about race conditions herestatic LEVEL_ENABLED_MAX_CONFIG: AtomicU8 = AtomicU8::new(LEVEL_ENABLED_MAX_DEFAULT as u8); pub fn init_env_filter(filter: env_config::EnvFilter) {    if let Some(level_max) = filter.level_global {        unsafe { LEVEL_ENABLED_MAX_STATIC = level_max }    }    if ENV_FILTER.set(filter).is_err() {        panic!("Environment filter cannot be initialized twice");    }} pub fn is_possibly_enabled_level(level: log::Level) -> bool {    return LEVEL_ENABLED_MAX_CONFIG.load(Ordering::Relaxed) <= level as u8;} pub fn is_scope_enabled(scope: &Scope, level: log::Level) -> bool {    if level <= unsafe { LEVEL_ENABLED_MAX_STATIC } {        // [FAST PATH]        // if the message is at or below the minimum printed log level        // (where error < warn < info etc) then always enable        return true;    }    if !is_possibly_enabled_level(level) {        // [FAST PATH PT. 2]        // if the message is above the maximum enabled log level        // (where error < warn < info etc) then disable without checking        // scope map        return false;    }    let global_scope_map = SCOPE_MAP.read().unwrap_or_else(|err| {        SCOPE_MAP.clear_poison();        return err.into_inner();    });     let Some(GlobalScopeMap { map, .. }) = global_scope_map.as_ref() else {        // on failure, return false because it's not <= LEVEL_ENABLED_MAX_STATIC        return false;    };     if map.is_empty() {        // if no scopes are enabled, return false because it's not <= LEVEL_ENABLED_MAX_STATIC        return false;    }    let enabled_status = map.is_enabled(&scope, level);    return match enabled_status {        // if it isn't configured, then it it's disabled because it's not <= LEVEL_ENABLED_MAX_STATIC        EnabledStatus::NotConfigured => false,        EnabledStatus::Enabled => true,        EnabledStatus::Disabled => false,    };} fn hash_scope_map_settings(map: &HashMap<String, String>) -> u64 {    let mut hasher = DefaultHasher::new();    let mut items = map.iter().collect::<Vec<_>>();    items.sort();    for (key, value) in items {        Hasher::write(&mut hasher, key.as_bytes());        Hasher::write(&mut hasher, value.as_bytes());    }    return hasher.finish();} pub(crate) fn refresh() {    refresh_from_settings(&HashMap::default());} pub fn refresh_from_settings(settings: &HashMap<String, String>) {    let hash_old = {        SCOPE_MAP            .read()            .unwrap_or_else(|err| {                SCOPE_MAP.clear_poison();                err.into_inner()            })            .as_ref()            .map(|scope_map| scope_map.hash)    };    let hash_new = hash_scope_map_settings(settings);    if hash_old == Some(hash_new) {        return;    }    let env_config = ENV_FILTER.get();    let map_new = ScopeMap::new_from_settings_and_env(settings, env_config);    let mut level_enabled_max = unsafe { LEVEL_ENABLED_MAX_STATIC };    for entry in &map_new.entries {        if let Some(level) = entry.enabled {            level_enabled_max = level_enabled_max.max(level.to_level_filter());        }    }    LEVEL_ENABLED_MAX_CONFIG.store(level_enabled_max as u8, Ordering::Release);     let mut global_map = SCOPE_MAP.write().unwrap_or_else(|err| {        SCOPE_MAP.clear_poison();        err.into_inner()    });    global_map.replace(GlobalScopeMap {        map: map_new,        hash: hash_new,    });} fn level_from_level_str(level_str: &String) -> Option<log::Level> {    let level = match level_str.to_ascii_lowercase().as_str() {        "" => log::Level::Trace,        "trace" => log::Level::Trace,        "debug" => log::Level::Debug,        "info" => log::Level::Info,        "warn" => log::Level::Warn,        "error" => log::Level::Error,        "off" | "disable" | "no" | "none" | "disabled" => {            crate::warn!(                "Invalid log level \"{level_str}\", set to error to disable non-error logging. Defaulting to error"            );            log::Level::Error        }        _ => {            crate::warn!("Invalid log level \"{level_str}\", ignoring");            return None;        }    };    return Some(level);} fn scope_alloc_from_scope_str(scope_str: &String) -> Option<ScopeAlloc> {    let mut scope_buf = [""; SCOPE_DEPTH_MAX];    let mut index = 0;    let mut scope_iter = scope_str.split(SCOPE_STRING_SEP_STR);    while index < SCOPE_DEPTH_MAX {        let Some(scope) = scope_iter.next() else {            break;        };        if scope == "" {            continue;        }        scope_buf[index] = scope;        index += 1;    }    if index == 0 {        return None;    }    if let Some(_) = scope_iter.next() {        crate::warn!(            "Invalid scope key, too many nested scopes: '{scope_str}'. Max depth is {SCOPE_DEPTH_MAX}",        );        return None;    }    let scope = scope_buf.map(|s| s.to_string());    return Some(scope);} pub struct ScopeMap {    entries: Vec<ScopeMapEntry>,    root_count: usize,} pub struct ScopeMapEntry {    scope: String,    enabled: Option<log::Level>,    descendants: std::ops::Range<usize>,} #[derive(Debug, Clone, Copy, PartialEq, Eq)]pub enum EnabledStatus {    Enabled,    Disabled,    NotConfigured,} impl ScopeMap {    pub fn new_from_settings_and_env(        items_input_map: &HashMap<String, String>,        env_config: Option<&env_config::EnvFilter>,    ) -> Self {        let mut items = Vec::with_capacity(            items_input_map.len() + env_config.map_or(0, |c| c.directive_names.len()),        );        if let Some(env_filter) = env_config {            // TODO: parse on load instead of every reload            items.extend(                env_filter                    .directive_names                    .iter()                    .zip(env_filter.directive_levels.iter())                    .filter_map(|(scope, level_filter)| {                        if items_input_map.get(scope).is_some() {                            return None;                        }                        let scope = scope_alloc_from_scope_str(scope)?;                        // TODO: use level filters instead of scopes in scope map                        let level = level_filter.to_level()?;                         Some((scope, level))                    }),            );        }        items.extend(            items_input_map                .into_iter()                .filter_map(|(scope_str, level_str)| {                    let scope = scope_alloc_from_scope_str(&scope_str)?;                    let level = level_from_level_str(&level_str)?;                    return Some((scope, level));                }),        );         items.sort_by(|a, b| a.0.cmp(&b.0));         let mut this = Self {            entries: Vec::with_capacity(items.len() * SCOPE_DEPTH_MAX),            root_count: 0,        };         let items_count = items.len();         struct ProcessQueueEntry {            parent_index: usize,            depth: usize,            items_range: std::ops::Range<usize>,        }        let mut process_queue = VecDeque::new();        process_queue.push_back(ProcessQueueEntry {            parent_index: usize::MAX,            depth: 0,            items_range: 0..items_count,        });         let empty_range = 0..0;         while let Some(process_entry) = process_queue.pop_front() {            let ProcessQueueEntry {                items_range,                depth,                parent_index,            } = process_entry;            let mut cursor = items_range.start;            let res_entries_start = this.entries.len();            while cursor < items_range.end {                let sub_items_start = cursor;                cursor += 1;                let scope_name = &items[sub_items_start].0[depth];                while cursor < items_range.end && &items[cursor].0[depth] == scope_name {                    cursor += 1;                }                let sub_items_end = cursor;                if scope_name == "" {                    assert_eq!(sub_items_start + 1, sub_items_end);                    assert_ne!(depth, 0);                    assert_ne!(parent_index, usize::MAX);                    assert!(this.entries[parent_index].enabled.is_none());                    this.entries[parent_index].enabled = Some(items[sub_items_start].1);                    continue;                }                let is_valid_scope = scope_name != "";                let is_last = depth + 1 == SCOPE_DEPTH_MAX || !is_valid_scope;                let mut enabled = None;                if is_last {                    assert_eq!(                        sub_items_start + 1,                        sub_items_end,                        "Expected one item: got: {:?}",                        &items[items_range.clone()]                    );                    enabled = Some(items[sub_items_start].1);                } else {                    let entry_index = this.entries.len();                    process_queue.push_back(ProcessQueueEntry {                        items_range: sub_items_start..sub_items_end,                        parent_index: entry_index,                        depth: depth + 1,                    });                }                this.entries.push(ScopeMapEntry {                    scope: scope_name.to_owned(),                    enabled,                    descendants: empty_range.clone(),                });            }            let res_entries_end = this.entries.len();            if parent_index != usize::MAX {                this.entries[parent_index].descendants = res_entries_start..res_entries_end;            } else {                this.root_count = res_entries_end;            }        }         return this;    }     pub fn is_empty(&self) -> bool {        self.entries.is_empty()    }     pub fn is_enabled<S>(&self, scope: &[S; SCOPE_DEPTH_MAX], level: log::Level) -> EnabledStatus    where        S: AsRef<str>,    {        let mut enabled = None;        let mut cur_range = &self.entries[0..self.root_count];        let mut depth = 0;         'search: while !cur_range.is_empty()            && depth < SCOPE_DEPTH_MAX            && scope[depth].as_ref() != ""        {            for entry in cur_range {                if entry.scope == scope[depth].as_ref() {                    // note:                    enabled = entry.enabled.or(enabled);                    cur_range = &self.entries[entry.descendants.clone()];                    depth += 1;                    continue 'search;                }            }            break 'search;        }         return enabled.map_or(EnabledStatus::NotConfigured, |level_enabled| {            if level <= level_enabled {                EnabledStatus::Enabled            } else {                EnabledStatus::Disabled            }        });    }} #[cfg(test)]mod tests {    use crate::private::scope_new;     use super::*;     fn scope_map_from_keys(kv: &[(&str, &str)]) -> ScopeMap {        let hash_map: HashMap<String, String> = kv            .iter()            .map(|(k, v)| (k.to_string(), v.to_string()))            .collect();        ScopeMap::new_from_settings_and_env(&hash_map, None)    }     #[test]    fn test_initialization() {        let map = scope_map_from_keys(&[("a.b.c.d", "trace")]);        assert_eq!(map.root_count, 1);        assert_eq!(map.entries.len(), 4);         let map = scope_map_from_keys(&[]);        assert_eq!(map.root_count, 0);        assert_eq!(map.entries.len(), 0);         let map = scope_map_from_keys(&[("", "trace")]);        assert_eq!(map.root_count, 0);        assert_eq!(map.entries.len(), 0);         let map = scope_map_from_keys(&[("foo..bar", "trace")]);        assert_eq!(map.root_count, 1);        assert_eq!(map.entries.len(), 2);         let map = scope_map_from_keys(&[            ("a.b.c.d", "trace"),            ("e.f.g.h", "debug"),            ("i.j.k.l", "info"),            ("m.n.o.p", "warn"),            ("q.r.s.t", "error"),        ]);        assert_eq!(map.root_count, 5);        assert_eq!(map.entries.len(), 20);        assert_eq!(map.entries[0].scope, "a");        assert_eq!(map.entries[1].scope, "e");        assert_eq!(map.entries[2].scope, "i");        assert_eq!(map.entries[3].scope, "m");        assert_eq!(map.entries[4].scope, "q");    }     fn scope_from_scope_str(scope_str: &'static str) -> Scope {        let mut scope_buf = [""; SCOPE_DEPTH_MAX];        let mut index = 0;        let mut scope_iter = scope_str.split(SCOPE_STRING_SEP_STR);        while index < SCOPE_DEPTH_MAX {            let Some(scope) = scope_iter.next() else {                break;            };            if scope == "" {                continue;            }            scope_buf[index] = scope;            index += 1;        }        assert_ne!(index, 0);        assert!(scope_iter.next().is_none());        return scope_buf;    }     #[test]    fn test_is_enabled() {        let map = scope_map_from_keys(&[            ("a.b.c.d", "trace"),            ("e.f.g.h", "debug"),            ("i.j.k.l", "info"),            ("m.n.o.p", "warn"),            ("q.r.s.t", "error"),        ]);        use log::Level;        assert_eq!(            map.is_enabled(&scope_from_scope_str("a.b.c.d"), Level::Trace),            EnabledStatus::Enabled        );        assert_eq!(            map.is_enabled(&scope_from_scope_str("a.b.c.d"), Level::Debug),            EnabledStatus::Enabled        );         assert_eq!(            map.is_enabled(&scope_from_scope_str("e.f.g.h"), Level::Debug),            EnabledStatus::Enabled        );        assert_eq!(            map.is_enabled(&scope_from_scope_str("e.f.g.h"), Level::Info),            EnabledStatus::Enabled        );        assert_eq!(            map.is_enabled(&scope_from_scope_str("e.f.g.h"), Level::Trace),            EnabledStatus::Disabled        );         assert_eq!(            map.is_enabled(&scope_from_scope_str("i.j.k.l"), Level::Info),            EnabledStatus::Enabled        );        assert_eq!(            map.is_enabled(&scope_from_scope_str("i.j.k.l"), Level::Warn),            EnabledStatus::Enabled        );        assert_eq!(            map.is_enabled(&scope_from_scope_str("i.j.k.l"), Level::Debug),            EnabledStatus::Disabled        );         assert_eq!(            map.is_enabled(&scope_from_scope_str("m.n.o.p"), Level::Warn),            EnabledStatus::Enabled        );        assert_eq!(            map.is_enabled(&scope_from_scope_str("m.n.o.p"), Level::Error),            EnabledStatus::Enabled        );        assert_eq!(            map.is_enabled(&scope_from_scope_str("m.n.o.p"), Level::Info),            EnabledStatus::Disabled        );         assert_eq!(            map.is_enabled(&scope_from_scope_str("q.r.s.t"), Level::Error),            EnabledStatus::Enabled        );        assert_eq!(            map.is_enabled(&scope_from_scope_str("q.r.s.t"), Level::Warn),            EnabledStatus::Disabled

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