From 24b0df95dfe8d41f8d8304291df390e7966e8ee2 Mon Sep 17 00:00:00 2001
From: Romein van Buren <romein@vburen.nl>
Date: Sat, 1 Jul 2023 20:30:43 +0200
Subject: [PATCH] Add ability to see host logs (#54)

Squashed commit of the following:

commit 93b2d67cef77d89df728ffbf831e5ce79904673e
Author: Romein van Buren <romein@vburen.nl>
Date:   Sat Jul 1 20:07:33 2023 +0200

    Add filter functionality

commit 30b65a198fc8d494fe660babd409e42a85c85d14
Author: Romein van Buren <romein@vburen.nl>
Date:   Sat Jul 1 19:27:20 2023 +0200

    Renamed `form-row` class to `formrow`

commit 21afb01ea191c6d5b597884fae637ae1b8f49a7a
Author: Romein van Buren <romein@vburen.nl>
Date:   Sat Jul 1 19:26:04 2023 +0200

    Hide object types in object grid

commit 037d5432a454720ad58f3c201bc60980759cc44f
Author: Romein van Buren <romein@vburen.nl>
Date:   Sat Jul 1 19:21:54 2023 +0200

    Make auto reload interval input smaller

commit 49d50220272d87c34cd84678baf01557d4c24051
Author: Romein van Buren <romein@vburen.nl>
Date:   Sat Jul 1 15:08:00 2023 +0200

    Implement logs autoreload

commit 1f8984766bbd8a1f6ce232daa40b8c49bf079d9f
Author: Romein van Buren <romein@vburen.nl>
Date:   Sat Jul 1 15:04:00 2023 +0200

    Return on error

commit 9c8525996494f023634ac3ea64370fc2778e717c
Author: Romein van Buren <romein@vburen.nl>
Date:   Sat Jul 1 15:03:37 2023 +0200

    Add log error handling

commit 7a98a63866b6fbfe3be5897feddbacf3fafd7dbf
Author: Romein van Buren <romein@vburen.nl>
Date:   Sat Jul 1 14:46:39 2023 +0200

    Update log tab icon

commit f30827ae2ec1c6254e0aab451de6763556c90ac5
Author: Romein van Buren <romein@vburen.nl>
Date:   Sat Jul 1 14:41:59 2023 +0200

    Add host log panel
---
 frontend/src/components/icon.svelte           |   2 +
 frontend/src/components/modal.svelte          |   5 +-
 frontend/src/components/objecteditor.svelte   |   2 +
 frontend/src/components/objectgrid.svelte     |  13 +-
 frontend/src/components/objectviewer.svelte   |   3 +-
 frontend/src/lib/mongo/index.js               |   4 +-
 frontend/src/lib/mongo/log-components.json    |  36 ++++
 frontend/src/lib/mongo/loglevels.json         |   7 +
 frontend/src/lib/stores/hosttree.js           |  21 +-
 .../connection/collection/find.svelte         |  14 +-
 .../connection/collection/stats.svelte        |   1 +
 .../connection/database/stats.svelte          |   1 +
 .../organisms/connection/host/index.svelte    |  16 +-
 .../src/organisms/connection/host/logs.svelte | 194 ++++++++++++++++++
 .../organisms/connection/host/status.svelte   |   1 +
 .../connection/host/systeminfo.svelte         |   1 +
 frontend/src/styles/style.css                 |   2 +-
 frontend/wailsjs/go/app/App.d.ts              |   2 +
 frontend/wailsjs/go/app/App.js                |   4 +
 internal/app/host_logs.go                     |  46 +++++
 20 files changed, 343 insertions(+), 32 deletions(-)
 create mode 100644 frontend/src/lib/mongo/log-components.json
 create mode 100644 frontend/src/lib/mongo/loglevels.json
 create mode 100644 frontend/src/organisms/connection/host/logs.svelte
 create mode 100644 internal/app/host_logs.go

diff --git a/frontend/src/components/icon.svelte b/frontend/src/components/icon.svelte
index 4f9f6d0..645a996 100644
--- a/frontend/src/components/icon.svelte
+++ b/frontend/src/components/icon.svelte
@@ -147,5 +147,7 @@
     <path d="M10.29 3.86 1.82 18a2 2 0 0 0 1.71 3h16.94a2 2 0 0 0 1.71-3L13.71 3.86a2 2 0 0 0-3.42 0zM12 9v4M12 17h.01" />
   {:else if name === 'loading'}
     <path d="M12 2v4M12 18v4M4.93 4.93l2.83 2.83M16.24 16.24l2.83 2.83M2 12h4M18 12h4M4.93 19.07l2.83-2.83M16.24 7.76l2.83-2.83" />
+  {:else if name === 'doc'}
+    <path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z" /><path d="M14 2v6h6M16 13H8M16 17H8M10 9H8" />
   {/if}
 </svg>
diff --git a/frontend/src/components/modal.svelte b/frontend/src/components/modal.svelte
index a7c9e7d..e1ae1df 100644
--- a/frontend/src/components/modal.svelte
+++ b/frontend/src/components/modal.svelte
@@ -5,7 +5,6 @@
 <script>
   import { Beep } from '$wails/go/ui/UI';
   import { createEventDispatcher } from 'svelte';
-  import { fade, fly } from 'svelte/transition';
   import Icon from './icon.svelte';
 
   export let show = true;
@@ -43,8 +42,8 @@
 <svelte:window on:keydown={keydown} />
 
 {#if show}
-  <div class="modal outer" transition:fade on:pointerdown|self={Beep}>
-    <div class="inner" style:max-width={width || '80vw'} transition:fly={{ y: -100 }}>
+  <div class="modal outer" on:pointerdown|self={Beep}>
+    <div class="inner" style:max-width={width || '80vw'}>
       {#if title}
         <header>
           <div class="title">{title}</div>
diff --git a/frontend/src/components/objecteditor.svelte b/frontend/src/components/objecteditor.svelte
index ecb7359..13e7494 100644
--- a/frontend/src/components/objecteditor.svelte
+++ b/frontend/src/components/objecteditor.svelte
@@ -9,6 +9,7 @@
 
   export let text = '';
   export let editor = undefined;
+  export let readonly = false;
 
   const dispatch = createEventDispatcher();
   let editorParent;
@@ -20,6 +21,7 @@
       keymap.of([ indentWithTab, indentOnInput ]),
       javascript(),
       EditorState.tabSize.of(4),
+      EditorState.readOnly.of(readonly),
       EditorView.updateListener.of(e => {
         if (!e.docChanged) {
           return;
diff --git a/frontend/src/components/objectgrid.svelte b/frontend/src/components/objectgrid.svelte
index 288463f..6036926 100644
--- a/frontend/src/components/objectgrid.svelte
+++ b/frontend/src/components/objectgrid.svelte
@@ -11,15 +11,16 @@
   export let errorTitle = '';
   export let errorDescription = '';
   export let busy = false;
-
-  const columns = [
-    { key: 'key', label: 'Key' },
-    { key: 'value', label: 'Value' },
-    { key: 'type', label: 'Type' },
-  ];
+  export let showTypes = true;
 
   let items = [];
 
+  $: columns = [
+    { key: 'key', label: 'Key' },
+    { key: 'value', label: 'Value' },
+    showTypes ? { key: 'type', label: 'Type' } : undefined,
+  ].filter(c => !!c);
+
   $: if (data) {
     // items = dissectObject(data).map(item => ({ ...item, menu: getRootMenu(item.key, item) }));
     items = [];
diff --git a/frontend/src/components/objectviewer.svelte b/frontend/src/components/objectviewer.svelte
index a05d8ec..41b62fa 100644
--- a/frontend/src/components/objectviewer.svelte
+++ b/frontend/src/components/objectviewer.svelte
@@ -7,6 +7,7 @@
   import ObjectEditor from './objecteditor.svelte';
 
   export let data;
+  export let readonly = false;
   export let saveable = false;
   export let successMessage = '';
 
@@ -37,7 +38,7 @@
 {#if data}
   <Modal bind:show={data} contentPadding={false}>
     <div class="objectviewer">
-      <ObjectEditor bind:text on:updated={() => successMessage = ''} />
+      <ObjectEditor bind:text on:updated={() => successMessage = ''} {readonly} />
     </div>
 
     <svelte:fragment slot="footer">
diff --git a/frontend/src/lib/mongo/index.js b/frontend/src/lib/mongo/index.js
index 10ecdbe..cd96c7f 100644
--- a/frontend/src/lib/mongo/index.js
+++ b/frontend/src/lib/mongo/index.js
@@ -2,8 +2,10 @@ import { ObjectId } from 'bson';
 import aggregationStages from './aggregation-stages.json';
 import atomicUpdateOperators from './atomic-update-operators.json';
 import locales from './locales.json';
+import logComponents from './log-components.json';
+import logLevels from './loglevels.json';
 
-export { aggregationStages, atomicUpdateOperators, locales };
+export { aggregationStages, atomicUpdateOperators, locales, logComponents, logLevels };
 
 // Calculate the min and max values of (un)signed integers with n bits
 export const intMin = bits => Math.pow(2, bits - 1) * -1;
diff --git a/frontend/src/lib/mongo/log-components.json b/frontend/src/lib/mongo/log-components.json
new file mode 100644
index 0000000..1e349c6
--- /dev/null
+++ b/frontend/src/lib/mongo/log-components.json
@@ -0,0 +1,36 @@
+[
+  "ACCESS",
+  "COMMAND",
+  "CONTROL",
+  "ELECTION",
+  "FTDC",
+  "GEO",
+  "INDEX",
+  "INITSYNC",
+  "JOURNAL",
+  "NETWORK",
+  "QUERY",
+  "RECOVERY",
+  "REPL",
+  "REPL_HB",
+  "ROLLBACK",
+  "SHARDING",
+  "STORAGE",
+  "TXN",
+  "WRITE",
+  "WT",
+  "WTBACKUP",
+  "WTCHKPT",
+  "WTCMPCT",
+  "WTEVICT",
+  "WTHS",
+  "WTRECOV",
+  "WTRTS",
+  "WTSLVG",
+  "WTTIER",
+  "WTTS",
+  "WTTXN",
+  "WTVRFY",
+  "WTWRTLOG",
+  "-"
+]
diff --git a/frontend/src/lib/mongo/loglevels.json b/frontend/src/lib/mongo/loglevels.json
new file mode 100644
index 0000000..28d9ec4
--- /dev/null
+++ b/frontend/src/lib/mongo/loglevels.json
@@ -0,0 +1,7 @@
+{
+  "F": "Fatal",
+  "E": "Error",
+  "W": "Warning",
+  "I": "Info",
+  "D": "Debug"
+}
diff --git a/frontend/src/lib/stores/hosttree.js b/frontend/src/lib/stores/hosttree.js
index daa7759..b3f6940 100644
--- a/frontend/src/lib/stores/hosttree.js
+++ b/frontend/src/lib/stores/hosttree.js
@@ -17,6 +17,7 @@ import {
   DropDatabase,
   DropIndex,
   GetIndexes,
+  HostLogs,
   Hosts,
   OpenCollection,
   OpenConnection,
@@ -263,17 +264,17 @@ async function refresh() {
         };
       }
 
-      host.newDatabase = async function() {
-        const name = await dialogs.enterText('Create a database', 'Enter the database name. Note: databases in MongoDB do not exist until they have a collection and an item. Your new database will not persist on the server; fill it to have it created.', '');
-        if (name) {
-          host.databases[name] = { key: name, new: true };
-          await host.open();
-        }
-      };
-
       await refresh();
     };
 
+    host.newDatabase = async function() {
+      const name = await dialogs.enterText('Create a database', 'Enter the database name. Note: databases in MongoDB do not exist until they have a collection and an item. Your new database will not persist on the server; fill it to have it created.', '');
+      if (name) {
+        host.databases[name] = { key: name, new: true };
+        await host.open();
+      }
+    };
+
     host.edit = async function() {
       const dialog = dialogs.new(HostDetailDialog, { hostKey });
       return new Promise(resolve => {
@@ -283,6 +284,10 @@ async function refresh() {
       });
     };
 
+    host.getLogs = async function(filter = 'global') {
+      return await HostLogs(hostKey, filter);
+    };
+
     host.remove = async function() {
       await RemoveHost(hostKey);
       await refresh();
diff --git a/frontend/src/organisms/connection/collection/find.svelte b/frontend/src/organisms/connection/collection/find.svelte
index 26a1d62..732637b 100644
--- a/frontend/src/organisms/connection/collection/find.svelte
+++ b/frontend/src/organisms/connection/collection/find.svelte
@@ -164,7 +164,7 @@
 
 <div class="find">
   <form on:submit|preventDefault={submitQuery}>
-    <div class="form-row one">
+    <div class="formrow one">
       <label class="field">
         <span class="label">Query or id</span>
         <input type="text"
@@ -192,7 +192,7 @@
       </label>
     </div>
 
-    <div class="form-row two">
+    <div class="formrow two">
       <label class="field">
         <span class="label">Fields</span>
         <input
@@ -229,7 +229,7 @@
       </label>
     </div>
 
-    <div class="form-row actions">
+    <div class="formrow actions">
       <button type="submit" class="button" title="Run query">
         <Icon name="play" /> Run
       </button>
@@ -342,18 +342,18 @@
     grid-template: auto 1fr / 1fr;
   }
 
-  .form-row {
+  .formrow {
     display: grid;
     gap: 0.5rem;
     margin-bottom: 0.5rem;
   }
-  .form-row.one {
+  .formrow.one {
     grid-template: 1fr / 3fr 2fr;
   }
-  .form-row.two {
+  .formrow.two {
     grid-template: 1fr / 5fr 1fr 1fr;
   }
-  .form-row.actions {
+  .formrow.actions {
     margin-bottom: 0rem;
     grid-template: 1fr / repeat(4, auto);
     justify-content: start;
diff --git a/frontend/src/organisms/connection/collection/stats.svelte b/frontend/src/organisms/connection/collection/stats.svelte
index b8d404d..d489e7e 100644
--- a/frontend/src/organisms/connection/collection/stats.svelte
+++ b/frontend/src/organisms/connection/collection/stats.svelte
@@ -20,6 +20,7 @@
   <div class="grid">
     <ObjectGrid
       data={collection.stats}
+      showTypes={false}
       errorTitle={collection.statsError ? 'Error fetching collection stats' : ''}
       errorDescription={collection.statsError}
       busy={!collection.stats && !collection.statsError && `Fetching stats for ${collection.key}…`}
diff --git a/frontend/src/organisms/connection/database/stats.svelte b/frontend/src/organisms/connection/database/stats.svelte
index 1143ba1..3d6d7f2 100644
--- a/frontend/src/organisms/connection/database/stats.svelte
+++ b/frontend/src/organisms/connection/database/stats.svelte
@@ -20,6 +20,7 @@
   <div class="grid">
     <ObjectGrid
       data={database.stats}
+      showTypes={false}
       errorTitle={database.statsError ? 'Error fetching database stats' : ''}
       errorDescription={database.statsError}
       busy={!database.stats && !database.statsError && `Fetching stats for ${database.key}…`}
diff --git a/frontend/src/organisms/connection/host/index.svelte b/frontend/src/organisms/connection/host/index.svelte
index 9c13e1e..f46a37d 100644
--- a/frontend/src/organisms/connection/host/index.svelte
+++ b/frontend/src/organisms/connection/host/index.svelte
@@ -2,6 +2,8 @@
   import BlankState from '$components/blankstate.svelte';
   import TabBar from '$components/tabbar.svelte';
   import { EventsOn } from '$wails/runtime/runtime';
+
+  import Logs from './logs.svelte';
   import Status from './status.svelte';
   import SystemInfo from './systeminfo.svelte';
 
@@ -23,14 +25,18 @@
 <div class="view" class:empty={!host}>
   {#if host}
     {#key host}
-      <TabBar tabs={[
-        { key: 'status', icon: 'chart', title: 'Host status' },
-        { key: 'systemInfo', icon: 'server', title: 'System info' },
-      ]}
-        bind:selectedKey={tab} />
+      <TabBar
+        tabs={[
+          { key: 'status', icon: 'chart', title: 'Host status' },
+          { key: 'logs', icon: 'doc', title: 'Logs' },
+          { key: 'systemInfo', icon: 'server', title: 'System info' },
+        ]}
+        bind:selectedKey={tab}
+      />
 
       <div class="container">
         {#if tab === 'status'} <Status {host} />
+        {:else if tab === 'logs'} <Logs {host} />
         {:else if tab === 'systemInfo'} <SystemInfo {host} />
         {/if}
       </div>
diff --git a/frontend/src/organisms/connection/host/logs.svelte b/frontend/src/organisms/connection/host/logs.svelte
new file mode 100644
index 0000000..6b105e1
--- /dev/null
+++ b/frontend/src/organisms/connection/host/logs.svelte
@@ -0,0 +1,194 @@
+<script>
+  import Grid from '$components/grid.svelte';
+  import Icon from '$components/icon.svelte';
+  import ObjectViewer from '$components/objectviewer.svelte';
+  import input from '$lib/actions/input';
+  import { logComponents, logLevels } from '$lib/mongo';
+  import { BrowserOpenURL } from '$wails/runtime/runtime';
+  import { onDestroy } from 'svelte';
+
+  export let host;
+
+  const autoReloadIntervals = [ 1, 2, 5, 10, 30, 60 ];
+  let filter = 'global';
+  let severityFilter = '';
+  let componentFilter = '';
+  let logs;
+  let total = 0;
+  let error = '';
+  let copySucceeded = false;
+  let autoReloadInterval = 0;
+  let objectViewerData;
+  let interval;
+  $: (filter || severityFilter || componentFilter) && refresh();
+  $: busy = !logs && !error && 'Requesting logs…';
+
+  $: if (autoReloadInterval) {
+    if (interval) {
+      clearInterval(interval);
+    }
+    interval = setInterval(refresh, autoReloadInterval * 1000);
+  }
+
+  async function refresh() {
+    let _logs = [];
+    ({ logs: _logs, total, error } = await host.getLogs(filter));
+    logs = [];
+
+    for (let index = 0; index < _logs.length; index++) {
+      const log = JSON.parse(_logs[index]);
+
+      const matchesLevel = severityFilter ? log.s?.startsWith(severityFilter) : true;
+      const matchesComponent = componentFilter ? (componentFilter === log.c?.toUpperCase()) : true;
+
+      if (matchesLevel && matchesComponent) {
+        log._index = index;
+        log.s = logLevels[log.s] || log.s;
+        logs = [ ...logs, log ];
+      }
+    }
+  }
+
+  function openFilterDocs() {
+    BrowserOpenURL('https://www.mongodb.com/docs/manual/reference/command/getLog/#command-fields');
+  }
+
+  function openLogDetail(event) {
+    objectViewerData = logs[event.detail.index];
+  }
+
+  async function copy() {
+    const json = JSON.stringify(host.status, undefined, '\t');
+    await navigator.clipboard.writeText(json);
+    copySucceeded = true;
+    setTimeout(() => copySucceeded = false, 1500);
+  }
+
+  onDestroy(() => {
+    if (interval) {
+      clearInterval(interval);
+    }
+  });
+</script>
+
+<div class="stats">
+  <div class="formrow">
+    <label class="field">
+      <span class="label">Auto reload (seconds)</span>
+      <input type="number" class="autoreloadinput" bind:value={autoReloadInterval} list="autoreloadintervals" use:input />
+    </label>
+
+    <label class="field">
+      <span class="label">Log type</span>
+      <select bind:value={filter}>
+        <option value="global">Global</option>
+        <option value="startupWarnings">Startup warnings</option>
+      </select>
+      <button class="button secondary" on:click={openFilterDocs} title="Documentation">
+        <Icon name="?" />
+      </button>
+    </label>
+  </div>
+
+  <div class="formrow">
+    <label class="field">
+      <span class="label">Severity</span>
+      <select bind:value={severityFilter}>
+        <option value="">All</option>
+        {#each Object.entries(logLevels) as [ value, name ]}
+          <option {value}>{value} ({name})</option>
+        {/each}
+      </select>
+    </label>
+
+    <label class="field">
+      <span class="label">Component</span>
+      <select bind:value={componentFilter}>
+        <option value="">All</option>
+        {#each logComponents as value}
+          <option {value}>{value}</option>
+        {/each}
+      </select>
+    </label>
+  </div>
+
+  <div class="grid">
+    <Grid
+      items={logs || []}
+      columns={[
+        { title: 'Date', key: 't.$date' },
+        { title: 'Severity', key: 's' },
+        { title: 'ID', key: 'id' },
+        { title: 'Component', key: 'c' },
+        { title: 'Context', key: 'ctx' },
+        { title: 'Message', key: 'msg' },
+      ]}
+      key="_index"
+      showHeaders
+      errorTitle={error ? 'Error fetching server status' : ''}
+      errorDescription={error}
+      on:trigger={openLogDetail}
+      {busy}
+    />
+  </div>
+
+  <div class="controls">
+    <button class="button" on:click={refresh}>
+      <Icon name="reload" spin={busy} /> Reload
+    </button>
+
+    <button class="button secondary" on:click={copy} disabled={!host.status}>
+      <Icon name={copySucceeded ? 'check' : 'clipboard'} />
+      Copy JSON
+    </button>
+
+    {#if total}
+      <div class="total">
+        Total: {total}
+      </div>
+    {/if}
+  </div>
+</div>
+
+{#if objectViewerData}
+  <ObjectViewer bind:data={objectViewerData} readonly />
+{/if}
+
+<datalist id="autoreloadintervals">
+  {#each autoReloadIntervals as value}
+    <option {value} />
+  {/each}
+</datalist>
+
+<style>
+  .stats {
+    display: grid;
+    gap: 0.5rem;
+    grid-template: auto auto 1fr auto / 1fr;
+  }
+
+  .formrow {
+    display: grid;
+    gap: 0.5rem;
+    grid-template: 1fr / 1fr 1fr;
+  }
+
+  .grid {
+    overflow: auto;
+    min-height: 0;
+    min-width: 0;
+    border: 1px solid #ccc;
+  }
+
+  .controls {
+    display: flex;
+    align-items: center;
+    gap: 0.2rem;
+  }
+  .total {
+    margin-left: auto;
+  }
+  .autoreloadinput {
+    width: 1.5rem;
+  }
+</style>
diff --git a/frontend/src/organisms/connection/host/status.svelte b/frontend/src/organisms/connection/host/status.svelte
index b63e270..be235ab 100644
--- a/frontend/src/organisms/connection/host/status.svelte
+++ b/frontend/src/organisms/connection/host/status.svelte
@@ -20,6 +20,7 @@
   <div class="grid">
     <ObjectGrid
       data={host.status || {}}
+      showTypes={false}
       errorTitle={host.statusError ? 'Error fetching server status' : ''}
       errorDescription={host.statusError}
       busy={!host.status && !host.statusError && 'Fetching server status…'}
diff --git a/frontend/src/organisms/connection/host/systeminfo.svelte b/frontend/src/organisms/connection/host/systeminfo.svelte
index 9626f56..2a42565 100644
--- a/frontend/src/organisms/connection/host/systeminfo.svelte
+++ b/frontend/src/organisms/connection/host/systeminfo.svelte
@@ -20,6 +20,7 @@
   <div class="grid">
     <ObjectGrid
       data={host.systemInfo}
+      showTypes={false}
       errorTitle={host.systemInfoError ? 'Error fetching system info' : ''}
       errorDescription={host.systemInfoError}
       busy={!host.systemInfo && !host.systemInfoError && 'Fetching system info…'}
diff --git a/frontend/src/styles/style.css b/frontend/src/styles/style.css
index 1288c9a..97eada7 100644
--- a/frontend/src/styles/style.css
+++ b/frontend/src/styles/style.css
@@ -142,7 +142,7 @@ select:disabled {
 .field > textarea,
 .field > select {
   flex: 1;
-  padding: 0.5rem;
+  padding: 0 0.5rem;
   border: 1px solid #ccc;
   background-color: #fff;
   appearance: none;
diff --git a/frontend/wailsjs/go/app/App.d.ts b/frontend/wailsjs/go/app/App.d.ts
index 9e3dd2c..ecd015c 100755
--- a/frontend/wailsjs/go/app/App.d.ts
+++ b/frontend/wailsjs/go/app/App.d.ts
@@ -24,6 +24,8 @@ export function FindItems(arg1:string,arg2:string,arg3:string,arg4:string):Promi
 
 export function GetIndexes(arg1:string,arg2:string,arg3:string):Promise<app.GetIndexesResult>;
 
+export function HostLogs(arg1:string,arg2:string):Promise<app.HostLogsResult>;
+
 export function Hosts():Promise<map[string]app.Host>;
 
 export function InsertItems(arg1:string,arg2:string,arg3:string,arg4:string):Promise<any>;
diff --git a/frontend/wailsjs/go/app/App.js b/frontend/wailsjs/go/app/App.js
index 5552e87..a2548f1 100755
--- a/frontend/wailsjs/go/app/App.js
+++ b/frontend/wailsjs/go/app/App.js
@@ -38,6 +38,10 @@ export function GetIndexes(arg1, arg2, arg3) {
   return window['go']['app']['App']['GetIndexes'](arg1, arg2, arg3);
 }
 
+export function HostLogs(arg1, arg2) {
+  return window['go']['app']['App']['HostLogs'](arg1, arg2);
+}
+
 export function Hosts() {
   return window['go']['app']['App']['Hosts']();
 }
diff --git a/internal/app/host_logs.go b/internal/app/host_logs.go
new file mode 100644
index 0000000..32073ea
--- /dev/null
+++ b/internal/app/host_logs.go
@@ -0,0 +1,46 @@
+package app
+
+import (
+	"github.com/wailsapp/wails/v2/pkg/runtime"
+	"go.mongodb.org/mongo-driver/bson"
+)
+
+type HostLogsResult struct {
+	Total int32    `json:"total"`
+	Logs  []string `json:"logs"`
+	Error string   `json:"error"`
+}
+
+func (a *App) HostLogs(hostKey, filter string) (result HostLogsResult) {
+	client, ctx, close, err := a.connectToHost(hostKey)
+	if err != nil {
+		result.Error = "Could not connect to host"
+		return
+	}
+	defer close()
+
+	var res bson.M
+	err = client.Database("admin").RunCommand(ctx, bson.M{"getLog": filter}).Decode(&res)
+	if err != nil {
+		runtime.LogWarningf(a.ctx, "Could not get %s logs for %s: %s", filter, hostKey, err.Error())
+		result.Error = err.Error()
+		return
+	}
+
+	if res["totalLinesWritten"] != nil {
+		result.Total = res["totalLinesWritten"].(int32)
+	} else {
+		result.Total = 0
+	}
+
+	result.Logs = make([]string, 0)
+
+	switch res["log"].(type) {
+	case bson.A:
+		for _, v := range res["log"].(bson.A) {
+			result.Logs = append(result.Logs, v.(string))
+		}
+	}
+
+	return
+}