feat: implement common job trait & better interface for scheduler & workers

src/scraper/jobs/mod.rs

@@ -0,0 +1,52 @@
+pub mod subject;
+
+use crate::data::models::TargetType;
+use crate::error::Result;
+use crate::{banner::BannerApi, scraper::jobs::subject::SubjectJob};
+use serde::{Deserialize, Serialize};
+use sqlx::PgPool;
+
+/// Common trait interface for all job types
+#[async_trait::async_trait]
+pub trait Job: Send + Sync {
+    /// The target type this job handles
+    fn target_type(&self) -> TargetType;
+
+    /// Process the job with the given API client and database pool
+    async fn process(&self, banner_api: &BannerApi, db_pool: &PgPool) -> Result<()>;
+
+    /// Get a human-readable description of the job
+    fn description(&self) -> String;
+}
+
+/// Main job enum that dispatches to specific job implementations
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum JobType {
+    Subject(SubjectJob),
+}
+
+impl JobType {
+    /// Create a job from the target type and payload
+    pub fn from_target_type_and_payload(
+        target_type: TargetType,
+        payload: serde_json::Value,
+    ) -> Result<Self> {
+        match target_type {
+            TargetType::Subject => {
+                let subject_payload: SubjectJob = serde_json::from_value(payload)?;
+                Ok(JobType::Subject(subject_payload))
+            }
+            _ => Err(anyhow::anyhow!(
+                "Unsupported target type: {:?}",
+                target_type
+            )),
+        }
+    }
+
+    /// Convert to a Job trait object
+    pub fn as_job(self) -> Box<dyn Job> {
+        match self {
+            JobType::Subject(payload) => Box::new(payload),
+        }
+    }
+}

src/scraper/jobs/subject.rs

@@ -0,0 +1,93 @@
+use super::Job;
+use crate::banner::{BannerApi, Course, SearchQuery, Term};
+use crate::data::models::TargetType;
+use crate::error::Result;
+use serde::{Deserialize, Serialize};
+use sqlx::PgPool;
+use tracing::{debug, info, trace};
+
+/// Job implementation for scraping subject data
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SubjectJob {
+    pub subject: String,
+}
+
+impl SubjectJob {
+    pub fn new(subject: String) -> Self {
+        Self { subject }
+    }
+}
+
+#[async_trait::async_trait]
+impl Job for SubjectJob {
+    fn target_type(&self) -> TargetType {
+        TargetType::Subject
+    }
+
+    async fn process(&self, banner_api: &BannerApi, db_pool: &PgPool) -> Result<()> {
+        let subject_code = &self.subject;
+        debug!(subject = subject_code, "Processing subject job");
+
+        // Get the current term
+        let term = Term::get_current().inner().to_string();
+        let query = SearchQuery::new().subject(subject_code).max_results(500);
+
+        let search_result = banner_api
+            .search(&term, &query, "subjectDescription", false)
+            .await?;
+
+        if let Some(courses_from_api) = search_result.data {
+            info!(
+                subject = subject_code,
+                count = courses_from_api.len(),
+                "Found courses"
+            );
+            for course in courses_from_api {
+                self.upsert_course(&course, db_pool).await?;
+            }
+        }
+
+        debug!(subject = subject_code, "Subject job completed");
+        Ok(())
+    }
+
+    fn description(&self) -> String {
+        format!("Scrape subject: {}", self.subject)
+    }
+}
+
+impl SubjectJob {
+    async fn upsert_course(&self, course: &Course, db_pool: &PgPool) -> Result<()> {
+        sqlx::query(
+            r#"
+            INSERT INTO courses (crn, subject, course_number, title, term_code, enrollment, max_enrollment, wait_count, wait_capacity, last_scraped_at)
+            VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10)
+            ON CONFLICT (crn, term_code) DO UPDATE SET
+                subject = EXCLUDED.subject,
+                course_number = EXCLUDED.course_number,
+                title = EXCLUDED.title,
+                enrollment = EXCLUDED.enrollment,
+                max_enrollment = EXCLUDED.max_enrollment,
+                wait_count = EXCLUDED.wait_count,
+                wait_capacity = EXCLUDED.wait_capacity,
+                last_scraped_at = EXCLUDED.last_scraped_at
+            "#,
+        )
+        .bind(&course.course_reference_number)
+        .bind(&course.subject)
+        .bind(&course.course_number)
+        .bind(&course.course_title)
+        .bind(&course.term)
+        .bind(course.enrollment)
+        .bind(course.maximum_enrollment)
+        .bind(course.wait_count)
+        .bind(course.wait_capacity)
+        .bind(chrono::Utc::now())
+        .execute(db_pool)
+        .await
+        .map(|result| {
+            trace!(result = ?result, "Course upserted");
+        })
+        .map_err(|e| anyhow::anyhow!("Failed to upsert course: {e}"))
+    }
+}

src/scraper/mod.rs

@@ -1,3 +1,4 @@
+pub mod jobs;
 pub mod scheduler;
 pub mod worker;
 

src/scraper/scheduler.rs

@@ -1,6 +1,7 @@
 use crate::banner::{BannerApi, Term};
 use crate::data::models::{ScrapePriority, TargetType};
 use crate::error::Result;
+use crate::scraper::jobs::subject::SubjectJob;
 use serde_json::json;
 use sqlx::PgPool;
 use std::sync::Arc;
@@ -78,7 +79,8 @@ impl Scheduler {
         let new_jobs: Vec<_> = subjects
             .into_iter()
             .filter_map(|subject| {
-                let payload = json!({ "subject": subject.code });
+                let job = SubjectJob::new(subject.code.clone());
+                let payload = serde_json::to_value(&job).unwrap();
                 let payload_str = payload.to_string();
 
                 if existing_payloads.contains(&payload_str) {

src/scraper/worker.rs

@@ -1,7 +1,7 @@
-use crate::banner::{BannerApi, BannerApiError, Course, SearchQuery, Term};
+use crate::banner::{BannerApi, BannerApiError};
 use crate::data::models::ScrapeJob;
 use crate::error::Result;
-use serde_json::Value;
+use crate::scraper::jobs::JobType;
 use sqlx::PgPool;
 use std::sync::Arc;
 use std::time::Duration;
@@ -110,81 +110,27 @@ impl Worker {
     }
 
     async fn process_job(&self, job: ScrapeJob) -> Result<()> {
-        match job.target_type {
-            crate::data::models::TargetType::Subject => {
-                self.process_subject_job(&job.target_payload).await
-            }
-            _ => {
-                warn!(worker_id = self.id, job_id = job.id, "unhandled job type");
-                Ok(())
-            }
-        }
-    }
-
-    async fn process_subject_job(&self, payload: &Value) -> Result<()> {
-        let subject_code = payload["subject"]
-            .as_str()
-            .ok_or_else(|| anyhow::anyhow!("Invalid subject payload"))?;
-        info!(
+        // Convert the database job to our job type
+        let job_type = JobType::from_target_type_and_payload(
+            job.target_type,
+            job.target_payload,
+        )?;
+        
+        // Get the job implementation
+        let job_impl = job_type.as_job();
+        
+        debug!(
             worker_id = self.id,
-            subject = subject_code,
-            "Scraping subject"
+            job_id = job.id,
+            description = job_impl.description(),
+            "Processing job"
         );
-
-        let term = Term::get_current().inner().to_string();
-        let query = SearchQuery::new().subject(subject_code).max_results(500);
-
-        let search_result = self
-            .banner_api
-            .search(&term, &query, "subjectDescription", false)
-            .await?;
-
-        if let Some(courses_from_api) = search_result.data {
-            info!(
-                worker_id = self.id,
-                subject = subject_code,
-                count = courses_from_api.len(),
-                "Found courses"
-            );
-            for course in courses_from_api {
-                self.upsert_course(&course).await?;
-            }
-        }
-
-        Ok(())
+        
+        // Process the job
+        job_impl.process(&self.banner_api, &self.db_pool).await
     }
 
-    async fn upsert_course(&self, course: &Course) -> Result<()> {
-        sqlx::query(
-            r#"
-            INSERT INTO courses (crn, subject, course_number, title, term_code, enrollment, max_enrollment, wait_count, wait_capacity, last_scraped_at)
-            VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10)
-            ON CONFLICT (crn, term_code) DO UPDATE SET
-                subject = EXCLUDED.subject,
-                course_number = EXCLUDED.course_number,
-                title = EXCLUDED.title,
-                enrollment = EXCLUDED.enrollment,
-                max_enrollment = EXCLUDED.max_enrollment,
-                wait_count = EXCLUDED.wait_count,
-                wait_capacity = EXCLUDED.wait_capacity,
-                last_scraped_at = EXCLUDED.last_scraped_at
-            "#,
-        )
-        .bind(&course.course_reference_number)
-        .bind(&course.subject)
-        .bind(&course.course_number)
-        .bind(&course.course_title)
-        .bind(&course.term)
-        .bind(course.enrollment)
-        .bind(course.maximum_enrollment)
-        .bind(course.wait_count)
-        .bind(course.wait_capacity)
-        .bind(chrono::Utc::now())
-        .execute(&self.db_pool)
-        .await?;
 
-        Ok(())
-    }
 
     async fn delete_job(&self, job_id: i32) -> Result<()> {
         sqlx::query("DELETE FROM scrape_jobs WHERE id = $1")