Better deamon

examples/musicbrainz_api/browse.rs

@@ -3,7 +3,7 @@ use std::{thread, time};
 use musichoard::{
     collection::musicbrainz::Mbid,
     external::musicbrainz::{
-        api::{browse::BrowseReleaseGroupRequest, MusicBrainzClient, NextPage, PageSettings},
+        api::{browse::BrowseReleaseGroupRequest, MusicBrainzClient, PageSettings},
         http::MusicBrainzHttp,
     },
 };
@@ -71,10 +71,10 @@ fn main() {
 
                     println!("Release groups in this response: {count}");
 
-                    match response.page.next_page_offset(count) {
-                        NextPage::Offset(next_offset) => paging.set_offset(next_offset),
-                        NextPage::Complete => break,
-                    }
+                    paging = match response.page.next_page(paging, count) {
+                        Some(paging) => paging,
+                        None => break,
+                    };
 
                     thread::sleep(time::Duration::from_secs(1));
                 }

src/external/musicbrainz/api/browse.rs

@@ -6,7 +6,7 @@ use crate::{
     collection::musicbrainz::Mbid,
     external::musicbrainz::{
         api::{
-            ApiDisplay, Error, MbReleaseGroupMeta, MusicBrainzClient, NextPage, PageSettings,
+            ApiDisplay, Error, MbReleaseGroupMeta, MusicBrainzClient, PageSettings,
             SerdeMbReleaseGroupMeta, MB_BASE_URL,
         },
         IMusicBrainzHttp,
@@ -21,8 +21,8 @@ pub struct BrowseReleaseGroupPage {
 }
 
 impl BrowseReleaseGroupPage {
-    pub fn next_page_offset(&self, page_count: usize) -> NextPage {
-        NextPage::next_page_offset(
+    pub fn next_page(&self, settings: PageSettings, page_count: usize) -> Option<PageSettings> {
+        settings.next_page(
             self.release_group_offset,
             self.release_group_count,
             page_count,
@@ -125,7 +125,7 @@ mod tests {
             release_group_count: 45,
         };
 
-        next_page_test(|val| page.next_page_offset(val));
+        next_page_test(|val| page.next_page(PageSettings::default(), val));
     }
 
     #[test]

src/external/musicbrainz/api/mod.rs

@@ -87,25 +87,13 @@ impl PageSettings {
     pub fn set_offset(&mut self, offset: usize) {
         self.offset = Some(offset);
     }
-}
 
-#[derive(Debug, PartialEq, Eq)]
-pub enum NextPage {
-    Offset(usize),
-    Complete,
-}
-
-impl NextPage {
-    pub fn new() -> NextPage {
-        NextPage::Offset(0)
-    }
-
-    pub fn next_page_offset(offset: usize, total_count: usize, page_count: usize) -> NextPage {
+    pub fn next_page(self, offset: usize, total_count: usize, page_count: usize) -> Option<Self> {
         let next_offset = offset + page_count;
         if next_offset < total_count {
-            NextPage::Offset(next_offset)
+            Some(self.with_offset(next_offset))
         } else {
-            NextPage::Complete
+            None
         }
     }
 }
@@ -370,21 +358,21 @@ mod tests {
 
     pub fn next_page_test<Fn>(mut f: Fn)
     where
-        Fn: FnMut(usize) -> NextPage,
+        Fn: FnMut(usize) -> Option<PageSettings>,
     {
         let next = f(20);
-        assert_eq!(next, NextPage::Offset(25));
+        assert_eq!(next.unwrap().offset, Some(25));
 
         let next = f(40);
-        assert_eq!(next, NextPage::Complete);
+        assert!(next.is_none());
 
         let next = f(100);
-        assert_eq!(next, NextPage::Complete);
+        assert!(next.is_none());
     }
 
     #[test]
     fn next_page() {
-        next_page_test(|val| NextPage::next_page_offset(5, 45, val));
+        next_page_test(|val| PageSettings::default().next_page(5, 45, val));
     }
 
     #[test]

src/external/musicbrainz/api/search/mod.rs

@@ -23,8 +23,6 @@ use crate::external::musicbrainz::{
     IMusicBrainzHttp,
 };
 
-use super::NextPage;
-
 #[derive(Clone, Copy, Debug, Deserialize, PartialEq, Eq)]
 #[serde(rename_all(deserialize = "kebab-case"))]
 pub struct SearchPage {
@@ -33,8 +31,8 @@ pub struct SearchPage {
 }
 
 impl SearchPage {
-    pub fn next_page_offset(&self, page_count: usize) -> NextPage {
-        NextPage::next_page_offset(self.offset, self.count, page_count)
+    pub fn next_page(&self, settings: PageSettings, page_count: usize) -> Option<PageSettings> {
+        settings.next_page(self.offset, self.count, page_count)
     }
 }
 
@@ -78,6 +76,6 @@ mod tests {
             count: 45,
         };
 
-        next_page_test(|val| page.next_page_offset(val));
+        next_page_test(|val| page.next_page(PageSettings::default(), val));
     }
 }

src/tui/lib/external/musicbrainz/api/mod.rs

@@ -25,7 +25,7 @@ use musichoard::{
     },
 };
 
-use crate::tui::lib::interface::musicbrainz::api::{Entity, Error, IMusicBrainz, Paged};
+use crate::tui::lib::interface::musicbrainz::api::{Entity, Error, IMusicBrainz};
 
 // GRCOV_EXCL_START
 pub struct MusicBrainz<Http> {
@@ -97,17 +97,17 @@ impl<Http: IMusicBrainzHttp> IMusicBrainz for MusicBrainz<Http> {
     fn browse_release_group(
         &mut self,
         artist: &Mbid,
-        paging: &mut PageSettings,
-    ) -> Result<Paged<Vec<Entity<AlbumMeta>>>, Error> {
+        paging: &mut Option<PageSettings>,
+    ) -> Result<Vec<Entity<AlbumMeta>>, Error> {
         let request = BrowseReleaseGroupRequest::artist(artist);
 
-        let mb_response = self.client.browse_release_group(&request, paging)?;
+        let page = paging.take().unwrap_or_default();
+        let mb_response = self.client.browse_release_group(&request, &page)?;
 
         let page_count = mb_response.release_groups.len();
-        let next = mb_response.page.next_page_offset(page_count);
-        let item = from_browse_release_group_response(mb_response);
+        *paging = mb_response.page.next_page(page, page_count);
 
-        Ok(Paged { item, next })
+        Ok(from_browse_release_group_response(mb_response))
     }
 }
 

src/tui/lib/external/musicbrainz/daemon/mod.rs

@@ -1,12 +1,12 @@
 use std::{collections::VecDeque, sync::mpsc, thread, time};
 
-use musichoard::external::musicbrainz::api::{NextPage, PageSettings};
+use musichoard::external::musicbrainz::api::PageSettings;
 
 use crate::tui::{
     app::EntityMatches,
     event::IFetchCompleteEventSender,
     lib::interface::musicbrainz::{
-        api::{Error as ApiError, IMusicBrainz, Paged},
+        api::{Error as ApiError, IMusicBrainz},
         daemon::{
             BrowseParams, EntityList, Error, IMbJobSender, LookupParams, MbParams, MbReturn,
             ResultSender, SearchParams,
@@ -228,13 +228,10 @@ impl JobInstance {
         event_sender: &mut dyn IFetchCompleteEventSender,
     ) -> Result<JobInstanceStatus, JobInstanceError> {
         // self.requests can be empty if the caller submits an empty job.
-        self.paging = match self.requests.front() {
-            Some(params) => {
-                let result_sender = &mut self.result_sender;
-                let paging = self.paging.take();
-                Self::execute(musicbrainz, result_sender, event_sender, &params, paging)?
-            }
-            None => None,
+        if let Some(params) = self.requests.front() {
+            let result_sender = &mut self.result_sender;
+            let paging = &mut self.paging;
+            Self::execute(musicbrainz, result_sender, event_sender, &params, paging)?;
         };
 
         if self.paging.is_none() {
@@ -253,13 +250,11 @@ impl JobInstance {
         result_sender: &mut ResultSender,
         event_sender: &mut dyn IFetchCompleteEventSender,
         api_params: &MbParams,
-        paging: Option<PageSettings>,
-    ) -> Result<Option<PageSettings>, JobInstanceError> {
-        let mut paging = match paging {
-            Some(paging) => paging,
-            None => PageSettings::with_max_limit(),
-        };
-        let mut next_page = NextPage::Complete;
+        paging: &mut Option<PageSettings>,
+    ) -> Result<(), JobInstanceError> {
+        if paging.is_none() {
+            *paging = Some(PageSettings::with_max_limit());
+        }
 
         let result = match api_params {
             MbParams::Lookup(lookup) => match lookup {
@@ -285,20 +280,13 @@ impl JobInstance {
             }
             .map(MbReturn::Match),
             MbParams::Browse(browse) => match browse {
-                BrowseParams::ReleaseGroup(params) => Paged::map_paged_result(
-                    musicbrainz.browse_release_group(&params.artist, &mut paging),
-                    |ents| EntityList::Album(ents.into_iter().map(|rg| rg.entity).collect()),
-                    &mut next_page,
-                ),
+                BrowseParams::ReleaseGroup(params) => musicbrainz
+                    .browse_release_group(&params.artist, paging)
+                    .map(|rv| EntityList::Album(rv.into_iter().map(|rg| rg.entity).collect())),
             }
             .map(MbReturn::Fetch),
         };
-        Self::return_result(result_sender, event_sender, result)?;
-
-        Ok(match next_page {
-            NextPage::Offset(offset) => Some(paging.with_offset(offset)),
-            NextPage::Complete => None,
-        })
+        Self::return_result(result_sender, event_sender, result)
     }
 
     fn return_result(

src/tui/lib/interface/musicbrainz/api/mod.rs

@@ -1,13 +1,11 @@
 //! Module for accessing MusicBrainz metadata.
 
-use std::mem;
-
 #[cfg(test)]
 use mockall::automock;
 
 use musichoard::{
     collection::{album::AlbumMeta, artist::ArtistMeta, musicbrainz::Mbid},
-    external::musicbrainz::api::{NextPage, PageSettings},
+    external::musicbrainz::api::PageSettings,
 };
 
 #[cfg_attr(test, automock)]
@@ -23,8 +21,8 @@ pub trait IMusicBrainz {
     fn browse_release_group(
         &mut self,
         artist: &Mbid,
-        paging: &mut PageSettings,
-    ) -> Result<Paged<Vec<Entity<AlbumMeta>>>, Error>;
+        paging: &mut Option<PageSettings>,
+    ) -> Result<Vec<Entity<AlbumMeta>>, Error>;
 }
 
 #[derive(Clone, Debug, PartialEq, Eq)]
@@ -44,31 +42,4 @@ impl<T> Entity<T> {
     }
 }
 
-pub struct Paged<T> {
-    pub item: T,
-    pub next: NextPage,
-}
-
-// pub fn map<U, F: FnOnce(T) -> U>(self, op: F) -> Result<U, E> {
-//     match self {
-//         Ok(t) => Ok(op(t)),
-//         Err(e) => Err(e),
-//     }
-// }
-
-impl<T> Paged<T> {
-    pub fn map_paged_result<E, U, F: FnOnce(T) -> U>(
-        result: Result<Paged<T>, E>,
-        op: F,
-        next: &mut NextPage,
-    ) -> Result<U, E> {
-        match result {
-            Ok(paged) => {
-                _ = mem::replace(next, paged.next);
-                Ok(op(paged.item))
-            }
-            Err(err) => Err(err),
-        }
-    }
-}
 pub type Error = musichoard::external::musicbrainz::api::Error;