Create metric selector via JS

scripts/graph/requests.ts

@@ -0,0 +1,71 @@
+/**
+ * `/graph/metrics` response data.
+ */
+export type MetricsResponse = {
+    // data_id: number; // TODO Uncomment
+
+    metrics: string[];
+};
+
+/**
+ * `/graph/commits` response data.
+ */
+export type CommitsResponse = {
+    // graph_id: number; // TODO Uncomment
+
+    hash_by_hash: string[];
+    author_by_hash: number[];
+    committer_date_by_hash: string[];
+    message_by_hash: string[];
+    parents: [string, string][];
+};
+
+/**
+ * `/graph/measurements` response data.
+ */
+export type MeasurementsResponse = {
+    // graph_id: number; // TODO Uncomment
+    // data_id: number; // TODO Uncomment
+
+    measurements: { [key: string]: (number | null)[]; };
+};
+
+/**
+ * Request different kinds of data from the server.
+ *
+ * This class has two main purposes:
+ *
+ * 1. Providing a nice interface for requesting data from the server
+ * 2. Preventing sending the same request again while still waiting for the server
+ */
+export class Requests {
+    #requesting_metrics: Promise<MetricsResponse> | null = null;
+    #requesting_commits: Promise<CommitsResponse> | null = null;
+    #requesting_measurements: Map<string, Promise<MeasurementsResponse>> = new Map();
+
+    async #request_data<R>(url: string): Promise<R> {
+        let response = await fetch(url);
+        let data: R = await response.json();
+        return data;
+    }
+
+    async get_metrics(): Promise<MetricsResponse | null> {
+        if (this.#requesting_metrics !== null) {
+            try {
+                return await this.#requesting_metrics;
+            } catch (error) {
+                return null;
+            }
+        }
+
+        this.#requesting_metrics = this.#request_data<MetricsResponse>("metrics");
+        try {
+            return await this.#requesting_metrics;
+        } catch (error) {
+            console.error("Could not get metrics:", error);
+            return null;
+        } finally {
+            this.#requesting_metrics = null;
+        }
+    }
+}