Initial commit: LangChain evolution tutorial deck (132 slides)

- Cover, TOC, 5 dividers, 3 recap slides - 5 sections (chains, langgraph, deepagents, openswe, ecosystem) - design-system.js with theme tokens + 9 helper functions - research/: timeline + sources + per-tech notes - final-compile.js + merge.js for rebuild pipeline - output/: langchain-evolution.pptx (2.3 MB) + langchain-evolution.pdf (1.1 MB) + 7 sample previews
2026-06-22 11:29:03 +03:00
parent ed5b5c91bf
commit 75601988c2
220 changed files with 13069 additions and 3 deletions
@@ -0,0 +1,71 @@
+/**
+ * slides/06-middleware.js
+ * ----------------------------------------------------------------------------
+ * Slide 06 -- Middleware: AgentMiddleware extension
+ * Custom middleware pattern.
+ */
+'use strict';
+
+const { helpers, layouts } = require('../../design-system');
+
+function buildMiddleware(pres, theme) {
+  const slide = pres.addSlide();
+  helpers.slideBase(slide, pres, theme);
+  helpers.addHeader(slide, pres, theme, {
+    eyebrow: 'STAGE 4',
+    sectionNumber: 4,
+    title: 'Middleware: точки расширения',
+  });
+
+  helpers.addCodeBlock(slide, pres, theme, {
+    x: 0.5, y: layouts.CONTENT_TOP, w: 5.6, h: 3.5,
+    language: 'python',
+    code: [
+      'from langchain.agents.middleware import (',
+      '    AgentMiddleware,',
+      ')',
+      '',
+      'class AuditMiddleware(AgentMiddleware):',
+      '    def after_model(self, state, runtime):',
+      '        runtime.logger.info(',
+      '            f"step={state.get(\"step\")}"',
+      '        )',
+      '        return state',
+      '',
+      '    def before_model(self, state, runtime):',
+      '        return state  # inject reminder',
+    ].join('\n'),
+    filePath: 'examples/audit_middleware.py',
+    startLine: 1,
+    highlightLines: [5, 6, 7, 8],
+  });
+
+  helpers.addCallout(slide, pres, theme, {
+    x: 6.3, y: layouts.CONTENT_TOP, w: 3.2, h: 1.7,
+    kind: 'info',
+    title: 'Built-in middleware',
+    text:
+      '* check_message_queue\n' +
+      '* notify_step_limit\n' +
+      '* open_pr_if_needed\n' +
+      '* ToolErrorMiddleware',
+  });
+
+  helpers.addCallout(slide, pres, theme, {
+    x: 6.3, y: 3.0, w: 3.2, h: 1.8,
+    kind: 'success',
+    title: 'Типичные кастомы',
+    text:
+      'Approval gate перед PR, cost ' +
+      'guard на длину контекста, ' +
+      'redaction секретов в логах.',
+  });
+
+  helpers.addPageNumber(slide, pres, theme, 6);
+  helpers.addSourceLine(slide, pres, theme, {
+    source: 'research/per-tech/openswe.md: 117-136, 213-223',
+  });
+  return slide;
+}
+
+module.exports = { buildMiddleware };