Output sccache stats as a notice and a summary table

src/show_stats.ts

@@ -14,24 +14,140 @@
 
 import * as core from '@actions/core';
 import * as exec from '@actions/exec';
+import {SummaryTableRow} from '@actions/core/lib/summary';
+
+async function get_output(command: string, args: string[]): Promise<string> {
+  core.debug(`get_output: ${command} ${args.join(' ')}`);
+
+  const output = await exec.getExecOutput(command, args);
+  // --stats-format=json does not emit a newline, which messes up group
+  // processing. Here we add a newline if it's missing.
+  if (!output.stdout.endsWith('\n')) {
+    process.stdout.write('\n');
+  }
+  return output.stdout.toString();
+}
 
 async function show_stats() {
   core.debug('start sccache show starts');
+  const human_stats = await core.group('Get human-readable stats', async () => {
+    return get_output(`${process.env.SCCACHE_PATH}`, ['--show-stats']);
+  });
+  const json_stats = await core.group('Get JSON stats', async () => {
+    return get_output(`${process.env.SCCACHE_PATH}`, [
+      '--show-stats',
+      '--stats-format=json'
+    ]);
+  });
 
-  const defaultListener = {
-    stdout: (data: Buffer) => {
-      stdout.push(data.toString());
-    }
-  };
-
-  const stdout: string[] = [];
+  const formatted_stats = format_json_stats(json_stats);
 
-  await exec.getExecOutput(`${process.env.SCCACHE_PATH}`, ['--show-stats'], {
-    listeners: defaultListener
+  core.notice(formatted_stats.notice, {
+    title: 'sccache stats'
   });
+  core.info('\nFull human-readable stats:');
+  core.info(human_stats);
+
+  core.summary.addHeading('sccache stats', 2);
+  core.summary.addTable(formatted_stats.table);
+  core.summary.addDetails(
+    'Full human-readable stats',
+    '\n\n```\n' + human_stats + '\n```\n\n'
+  );
+
+  await core.summary.write();
 }
 
 show_stats().catch(err => {
   core.error(err);
   core.setFailed(err.message);
 });
+
+interface Duration {
+  secs: number;
+  nanos: number;
+}
+
+interface Counter {
+  counts: {
+    [key: string]: number;
+  };
+  adv_counts: {
+    [key: string]: number;
+  };
+}
+
+interface Stats {
+  stats: {
+    compile_requests: number;
+    requests_executed: number;
+
+    cache_errors: Counter;
+    cache_hits: Counter;
+    cache_misses: Counter;
+
+    cache_write_errors: number;
+    cache_writes: number;
+
+    cache_write_duration: Duration;
+    cache_read_hit_duration: Duration;
+    compiler_write_duration: Duration;
+  };
+}
+
+function sum_stats(stats: Counter): number {
+  return Object.values(stats.counts).reduce((acc, val) => acc + val, 0);
+}
+
+function format_duration(duration: Duration): string {
+  const ms = duration.nanos / 1e6;
+  return `${duration.secs}s ${ms}ms`;
+}
+
+function format_json_stats(raw_stats: string): {
+  table: SummaryTableRow[];
+  notice: string;
+} {
+  const stats: Stats = JSON.parse(raw_stats);
+  const cache_error_count = sum_stats(stats.stats.cache_errors).toString();
+  const cache_hit_count = sum_stats(stats.stats.cache_hits).toString();
+  const cache_miss_count = sum_stats(stats.stats.cache_misses).toString();
+
+  const write_duration = format_duration(stats.stats.cache_write_duration);
+  const read_duration = format_duration(stats.stats.cache_read_hit_duration);
+  const compiler_duration = format_duration(
+    stats.stats.compiler_write_duration
+  );
+
+  const notice = `${cache_hit_count} hits, ${cache_miss_count} misses, ${cache_error_count} errors`;
+
+  const table = [
+    [{data: 'Cache hits', header: true}, {data: cache_hit_count.toString()}],
+    [{data: 'Cache misses', header: true}, {data: cache_miss_count.toString()}],
+    [
+      {data: 'Cache errors', header: true},
+      {data: cache_error_count.toString()}
+    ],
+    [
+      {data: 'Compile requests', header: true},
+      {data: stats.stats.compile_requests.toString()}
+    ],
+    [
+      {data: 'Requests executed', header: true},
+      {data: stats.stats.requests_executed.toString()}
+    ],
+    [
+      {data: 'Cache writes', header: true},
+      {data: stats.stats.cache_writes.toString()}
+    ],
+    [
+      {data: 'Cache write errors', header: true},
+      {data: stats.stats.cache_write_errors.toString()}
+    ],
+    [{data: 'Cache write duration', header: true}, {data: write_duration}],
+    [{data: 'Cache read hit duration', header: true}, {data: read_duration}],
+    [{data: 'Compiler write duration', header: true}, {data: compiler_duration}]
+  ];
+
+  return {table, notice};
+}