Remove module-based logging

This patch removes the module-based logging mechanism.
This mechanism was introduced so that the configuration file is able to
define which imag module logs what. This was a fine-granular setting,
but most users won't actually touch it. It was more of a
debugging-thing for developers. I rarely used it during development and
it only introduced more headaches. It also was not updated (as in the
configuration file missed a few modules, others where not removed
despite the module did not exist anymore).

All in all, it was rather unmaintained and just "too much".

Thus, remove this thing completely. Developers know how to use grep.

This also automatically fixes bugs where `imag --debug command` did not
output any debugging log, but was expected to.

Signed-off-by: Matthias Beyer <mail@beyermatthias.de>

2 files changed, 18 insertions, 140 deletions

diff --git a/lib/core/libimagrt/src/lib.rs b/lib/core/libimagrt/src/lib.rs
index c5862858..f7c9f579 100644
--- a/lib/core/libimagrt/src/lib.rs
+++ b/lib/core/libimagrt/src/lib.rs
@@ -42,7 +42,6 @@ extern crate itertools;
 extern crate ansi_term;
 extern crate handlebars;
 extern crate serde;
-#[macro_use] extern crate serde_derive;
 #[macro_use] extern crate failure;
 #[macro_use] extern crate toml_query;
 
diff --git a/lib/core/libimagrt/src/logger.rs b/lib/core/libimagrt/src/logger.rs
index c06f9fdc..c79f2ec2 100644
--- a/lib/core/libimagrt/src/logger.rs
+++ b/lib/core/libimagrt/src/logger.rs
@@ -37,8 +37,6 @@ use handlebars::Handlebars;
 
 use libimagerror::errors::ErrorMsg as EM;
 
-type ModuleName = String;
-
 #[derive(Debug)]
 enum LogDestination {
     Stderr,
@@ -51,15 +49,6 @@ impl Default for LogDestination {
     }
 }
 
-#[derive(Debug)]
-struct ModuleSettings {
-    enabled:        bool,
-    level:          Option<Level>,
-
-    #[allow(unused)]
-    destinations:   Option<Vec<LogDestination>>,
-}
-
 /// Logger implementation for `log` crate.
 #[derive(Debug)]
 pub struct ImagLogger {
@@ -67,12 +56,6 @@ pub struct ImagLogger {
 
     #[allow(unused)]
     global_destinations : Vec<LogDestination>,
-    // global_format_trace : ,
-    // global_format_debug : ,
-    // global_format_info  : ,
-    // global_format_warn  : ,
-    // global_format_error : ,
-    module_settings     : BTreeMap<ModuleName, ModuleSettings>,
 
     handlebars: Handlebars,
 }
@@ -100,7 +83,6 @@ impl ImagLogger {
         Ok(ImagLogger {
             global_loglevel     : aggregate_global_loglevel(matches, config)?,
             global_destinations : aggregate_global_destinations(config)?,
-            module_settings     : aggregate_module_settings(matches, config)?,
             handlebars,
         })
     }
@@ -153,45 +135,13 @@ impl Log for ImagLogger {
             }
         };
 
-        // hack to get the right target configuration.
-        // If there is no element here, we use the empty string which automatically drops through
-        // to the unwrap_or_else() case
-        let record_target = record
-            .target()
-            .split("::")
-            .next()
-            .unwrap_or("");
-
-        self.module_settings
-            .get(record_target)
-            .map(|module_setting| {
-                let set = module_setting.enabled &&
-                    (module_setting.level.unwrap_or(self.global_loglevel) >= record.level()
-                     || self.global_loglevel >= record.level());
-
-                if set {
-                    if let Some(destinations) = &module_setting.destinations {
-                        for d in destinations {
-                            // If there's an error, we cannot do anything, can we?
-                            log_to_destination(&d);
-                        }
-                    }
-
-                    for d in self.global_destinations.iter() {
-                        // If there's an error, we cannot do anything, can we?
-                        log_to_destination(&d);
-                    }
-                }
-            })
-        .unwrap_or_else(|| {
-            if self.global_loglevel >= record.level() {
-                // Yes, we log
-                for d in self.global_destinations.iter() {
-                    // If there's an error, we cannot do anything, can we?
-                    log_to_destination(&d);
-                }
+        if self.global_loglevel >= record.level() {
+            // Yes, we log
+            for d in self.global_destinations.iter() {
+                // If there's an error, we cannot do anything, can we?
+                log_to_destination(&d);
             }
-        });
+        }
     }
 }
 
@@ -264,22 +214,7 @@ fn translate_destination(raw: &str) -> Result<LogDestination> {
     }
 }
 
-
-fn translate_destinations(raw: &[Value]) -> Result<Vec<LogDestination>> {
-    raw.iter()
-        .map(|val| {
-            val.as_str()
-                .ok_or_else(|| "Type error at 'imag.logging.modules.<mod>.destinations', expected Array<String>")
-                .map_err(err_msg)
-                .map_err(Error::from)
-                .and_then(|s| translate_destination(s))
-        })
-        .collect()
-}
-
-fn aggregate_global_destinations(config: Option<&Value>)
-    -> Result<Vec<LogDestination>>
-{
+fn aggregate_global_destinations(config: Option<&Value>) -> Result<Vec<LogDestination>> {
     match config {
         None      => Ok(vec![LogDestination::default()]),
         Some(cfg) => cfg
@@ -292,7 +227,17 @@ fn aggregate_global_destinations(config: Option<&Value>)
                 let msg = "Type error at 'imag.logging.destinations', expected 'Array'";
                 err_msg(msg)
             })
-            .and_then(|val| translate_destinations(val)),
+            .and_then(|raw| {
+                raw.iter()
+                    .map(|val| {
+                        val.as_str()
+                            .ok_or_else(|| "Type error at 'imag.logging.modules.<mod>.destinations', expected Array<String>")
+                            .map_err(err_msg)
+                            .map_err(Error::from)
+                            .and_then(|s| translate_destination(s))
+                    })
+                    .collect::<Result<Vec<LogDestination>>>()
+            }),
     }
 }
 
@@ -347,69 +292,3 @@ mod log_lvl_aggregate {
 
 }
 
-fn aggregate_module_settings(_matches: &ArgMatches, config: Option<&Value>)
-    -> Result<BTreeMap<ModuleName, ModuleSettings>>
-{
-    use std::convert::TryInto;
-
-    //
-    // We define helper types here for deserializing easily using typed toml-query functionality.
-    //
-    // We need the helper types because we cannot deserialize in the target types directly, because
-    // of the `File(Arc<Mutex<::std::fs::File>>)` variant in `LogDestination`, which would
-    // technically possible to deserialize the toml into the type, but it might be a bad idea.
-    //
-    // This code is idomatic enough for the conversions, so it is not a big painpoint.
-    //
-
-    #[derive(Serialize, Deserialize, Debug)]
-    struct LoggingModuleConfig {
-        pub destinations: Option<Vec<String>>,
-        pub level: Option<Level>,
-        pub enabled: bool,
-    }
-
-    #[derive(Partial, Serialize, Deserialize, Debug)]
-    #[location = "imag.logging.modules"]
-    struct LoggingModuleConfigMap(BTreeMap<String, LoggingModuleConfig>);
-
-    impl TryInto<BTreeMap<String, ModuleSettings>> for LoggingModuleConfigMap {
-        type Error = Error;
-
-        fn try_into(self) -> Result<BTreeMap<String, ModuleSettings>> {
-            let mut map = BTreeMap::new();
-
-            for (key, value) in self.0.into_iter() {
-                map.insert(key, ModuleSettings {
-                    enabled:      value.enabled,
-                    level:        value.level.map(Into::into),
-                    destinations: match value.destinations {
-                        None     => None,
-                        Some(ds) => Some(ds
-                            .iter()
-                            .map(Deref::deref)
-                            .map(translate_destination) // This is why we do this whole thing
-                            .collect::<Result<Vec<LogDestination>>>()?)
-                    },
-                });
-            }
-
-            Ok(map)
-        }
-    }
-
-    match config {
-        Some(cfg) => cfg.read_partial::<LoggingModuleConfigMap>()?
-            .ok_or_else(|| err_msg("Logging configuration missing"))?
-            .try_into()
-            .map_err(Error::from),
-        None => {
-            write!(stderr(), "No Configuration.").ok();
-            write!(stderr(), "cannot find module-settings for logging.").ok();
-            write!(stderr(), "Will use global defaults").ok();
-
-            Ok(BTreeMap::new())
-        }
-    }
-}
-