And graphql search with pagination.

server/src/bin/server.rs

@@ -1,17 +1,8 @@
 #[macro_use]
 extern crate rocket;
+use std::{error::Error, io::Cursor, str::FromStr};
 
-use std::{
+use async_graphql::{http::GraphiQLSource, EmptyMutation, EmptySubscription, Schema};
-    error::Error,
-    hash::{DefaultHasher, Hash, Hasher},
-    io::Cursor,
-    str::FromStr,
-};
-
-use async_graphql::{
-    http::GraphiQLSource, Context, EmptyMutation, EmptySubscription, FieldResult, Object, Schema,
-    SimpleObject,
-};
 use async_graphql_rocket::{GraphQLQuery, GraphQLRequest, GraphQLResponse};
 use glog::Flags;
 use notmuch::{Notmuch, NotmuchError, ThreadSet};
@@ -23,7 +14,11 @@ use rocket::{
     Response, State,
 };
 use rocket_cors::{AllowedHeaders, AllowedOrigins};
-use server::{error::ServerError, nm::threadset_to_messages};
+use server::{
+    error::ServerError,
+    graphql::{GraphqlSchema, QueryRoot},
+    nm::threadset_to_messages,
+};
 use shared::Message;
 
 #[get("/refresh")]
@@ -148,38 +143,6 @@ async fn graphql_request(
     request.execute(schema.inner()).await
 }
 
-pub struct QueryRoot;
-
-#[derive(SimpleObject)]
-struct Tag {
-    name: String,
-    fg_color: String,
-    bg_color: String,
-}
-
-#[Object]
-impl QueryRoot {
-    async fn tags<'ctx>(&self, ctx: &Context<'ctx>) -> FieldResult<Vec<Tag>> {
-        let nm = ctx.data_unchecked::<Notmuch>();
-        Ok(nm
-            .tags()?
-            .into_iter()
-            .map(|tag| {
-                let mut hasher = DefaultHasher::new();
-                tag.hash(&mut hasher);
-                let hex = format!("#{:06x}", hasher.finish() % (1 << 24));
-                Tag {
-                    name: tag,
-                    fg_color: "white".to_string(),
-                    bg_color: hex,
-                }
-            })
-            .collect())
-    }
-}
-
-pub type GraphqlSchema = Schema<QueryRoot, EmptyMutation, EmptySubscription>;
-
 #[rocket::main]
 async fn main() -> Result<(), Box<dyn Error>> {
     glog::new()

server/src/graphql.rs

@@ -0,0 +1,138 @@
+use std::hash::{DefaultHasher, Hash, Hasher};
+
+use async_graphql::{
+    connection::{self, Connection, Edge},
+    Context, EmptyMutation, EmptySubscription, Error, FieldResult, Object, Schema, SimpleObject,
+};
+use log::info;
+use notmuch::Notmuch;
+
+pub struct QueryRoot;
+
+/// # Number of seconds since the Epoch
+pub type UnixTime = isize;
+
+/// # Thread ID, sans "thread:"
+pub type ThreadId = String;
+
+#[derive(Debug, SimpleObject)]
+pub struct ThreadSummary {
+    pub thread: ThreadId,
+    pub timestamp: UnixTime,
+    /// user-friendly timestamp
+    pub date_relative: String,
+    /// number of matched messages
+    pub matched: isize,
+    /// total messages in thread
+    pub total: isize,
+    /// comma-separated names with | between matched and unmatched
+    pub authors: String,
+    pub subject: String,
+    pub tags: Vec<String>,
+}
+
+#[derive(SimpleObject)]
+struct Tag {
+    name: String,
+    fg_color: String,
+    bg_color: String,
+}
+
+#[Object]
+impl QueryRoot {
+    async fn search<'ctx>(
+        &self,
+        ctx: &Context<'ctx>,
+        after: Option<String>,
+        before: Option<String>,
+        first: Option<i32>,
+        last: Option<i32>,
+        query: String,
+    ) -> Result<Connection<usize, ThreadSummary>, Error> {
+        let nm = ctx.data_unchecked::<Notmuch>();
+        connection::query(
+            after,
+            before,
+            first,
+            last,
+            |after, before, first, last| async move {
+                info!("{after:?} {before:?} {first:?} {last:?} {query}");
+                let mut start = 0usize;
+                let total = nm.count(&query)?;
+                let mut end = total;
+
+                if let Some(after) = after {
+                    if after >= total {
+                        return Ok(Connection::new(false, false));
+                    }
+                    start = after + 1;
+                }
+
+                // TODO(wathiede): handle last/end.
+                if let Some(before) = before {
+                    if before == 0 {
+                        return Ok(Connection::new(false, false));
+                    }
+                    end = before;
+                }
+
+                let slice: Vec<ThreadSummary> = nm
+                    .search(&query, start, first.unwrap_or(20))?
+                    .0
+                    .into_iter()
+                    .map(|ts| ThreadSummary {
+                        thread: ts.thread,
+                        timestamp: ts.timestamp,
+                        date_relative: ts.date_relative,
+                        matched: ts.matched,
+                        total: ts.total,
+                        authors: ts.authors,
+                        subject: ts.subject,
+                        tags: ts.tags,
+                    })
+                    .collect();
+                //let mut slice = &res[..];
+
+                /*
+                if let Some(first) = first {
+                    slice = &slice[..first.min(slice.len())];
+                    end -= first.min(slice.len());
+                } else if let Some(last) = last {
+                    slice = &slice[slice.len() - last.min(slice.len())..];
+                    start = end - last.min(slice.len());
+                }
+                */
+
+                let mut connection = Connection::new(start > 0, end < total);
+                connection.edges.extend(
+                    slice
+                        .into_iter()
+                        .enumerate()
+                        .map(|(idx, item)| Edge::new(start + idx, item)),
+                );
+                Ok::<_, Error>(connection)
+            },
+        )
+        .await
+    }
+
+    async fn tags<'ctx>(&self, ctx: &Context<'ctx>) -> FieldResult<Vec<Tag>> {
+        let nm = ctx.data_unchecked::<Notmuch>();
+        Ok(nm
+            .tags()?
+            .into_iter()
+            .map(|tag| {
+                let mut hasher = DefaultHasher::new();
+                tag.hash(&mut hasher);
+                let hex = format!("#{:06x}", hasher.finish() % (1 << 24));
+                Tag {
+                    name: tag,
+                    fg_color: "white".to_string(),
+                    bg_color: hex,
+                }
+            })
+            .collect())
+    }
+}
+
+pub type GraphqlSchema = Schema<QueryRoot, EmptyMutation, EmptySubscription>;

server/src/lib.rs

@@ -1,2 +1,3 @@
 pub mod error;
+pub mod graphql;
 pub mod nm;

server/src/nm.rs

@@ -7,7 +7,7 @@ pub fn threadset_to_messages(
     thread_set: notmuch::ThreadSet,
 ) -> Result<Vec<Message>, error::ServerError> {
     for t in thread_set.0 {
-        for tn in t.0 {}
+        for _tn in t.0 {}
     }
     Ok(Vec::new())
 }