Handle SpacetimeDB migration imports with chunked uploads

scripts/spacetime-import-migration-json.mjs

@@ -1,5 +1,6 @@
 #!/usr/bin/env node
 
+import { randomUUID } from 'node:crypto';
 import { readFile } from 'node:fs/promises';
 import path from 'node:path';
 import {
@@ -11,6 +12,8 @@ import {
   parseArgs,
 } from './spacetime-migration-common.mjs';
 
+const DEFAULT_MIGRATION_IMPORT_CHUNK_SIZE = 512 * 1024;
+
 try {
   const options = parseArgs(process.argv.slice(2));
   if (!options.in) {
@@ -30,7 +33,7 @@ try {
   const webOptions = await prepareWebImportOptions(options);
   let result;
   try {
-    result = await importMigrationJsonDirect(webOptions, migrationJson);
+    result = await importMigrationJsonWithFallback(webOptions, migrationJson);
   } finally {
     await revokeTemporaryWebIdentity(webOptions);
   }
@@ -86,6 +89,25 @@ async function prepareWebImportOptions(options) {
   };
 }
 
+async function importMigrationJsonWithFallback(options, migrationJson) {
+  const chunkSize = resolveChunkSize(options);
+  if (Buffer.byteLength(migrationJson, 'utf8') > chunkSize) {
+    return importMigrationJsonChunked(options, migrationJson, chunkSize);
+  }
+
+  try {
+    return await importMigrationJsonDirect(options, migrationJson);
+  } catch (error) {
+    if (!isRequestBodyTooLargeError(error)) {
+      throw error;
+    }
+    console.warn(
+      `[spacetime:migration:import] 直接导入触发 HTTP 413，改用 ${chunkSize} bytes 分片上传。`,
+    );
+    return importMigrationJsonChunked(options, migrationJson, chunkSize);
+  }
+}
+
 async function importMigrationJsonDirect(options, migrationJson) {
   const includeTables = resolveImportIncludeTables(options, migrationJson);
   const procedureName =
@@ -108,6 +130,60 @@ async function importMigrationJsonDirect(options, migrationJson) {
   return callSpacetimeProcedure(options, procedureName, input);
 }
 
+async function importMigrationJsonChunked(options, migrationJson, chunkSize) {
+  const includeTables = resolveImportIncludeTables(options, migrationJson);
+  const procedureName =
+    options.incremental === true
+      ? 'import_database_migration_incremental_from_chunks'
+      : 'import_database_migration_from_chunks';
+  const uploadId = `migration-${Date.now()}-${randomUUID()}`;
+  const chunks = splitStringByUtf8Bytes(migrationJson, chunkSize);
+  console.log(
+    `[spacetime:migration:import] 使用分片导入: upload_id=${uploadId}, chunks=${chunks.length}, chunk_size=${chunkSize}`,
+  );
+  if (options.replaceExisting === true) {
+    console.log(
+      `[spacetime:migration:import] replace-existing 仅覆盖本次文件内的表: ${includeTables.join(', ') || '无'}`,
+    );
+  } else if (options.incremental === true) {
+    console.log(`[spacetime:migration:import] 使用增量模式，已存在或冲突的行会跳过`);
+  }
+
+  let committed = false;
+  try {
+    for (let index = 0; index < chunks.length; index += 1) {
+      const chunkResult = await callSpacetimeProcedure(
+        options,
+        'put_database_migration_import_chunk',
+        {
+          upload_id: uploadId,
+          chunk_index: index,
+          chunk_count: chunks.length,
+          chunk: chunks[index],
+        },
+      );
+      ensureProcedureOk(chunkResult);
+      console.log(
+        `[spacetime:migration:import] 已上传迁移分片 ${index + 1}/${chunks.length}`,
+      );
+    }
+
+    const result = await callSpacetimeProcedure(options, procedureName, {
+      upload_id: uploadId,
+      include_tables: includeTables,
+      replace_existing: options.replaceExisting === true,
+      dry_run: options.dryRun === true,
+    });
+    ensureProcedureOk(result);
+    committed = true;
+    return result;
+  } finally {
+    if (!committed) {
+      await clearMigrationChunksBestEffort(options, uploadId);
+    }
+  }
+}
+
 function resolveImportIncludeTables(options, migrationJson) {
   if (options.replaceExisting !== true) {
     return options.includeTables;
@@ -152,6 +228,63 @@ function readMigrationTableNames(migrationJson) {
   return tableNames;
 }
 
+function resolveChunkSize(options) {
+  const chunkSize = options.chunkSize || DEFAULT_MIGRATION_IMPORT_CHUNK_SIZE;
+  if (chunkSize > 1024 * 1024) {
+    throw new Error('--chunk-size 不能超过 1048576，避免触发迁移分片 procedure 单片限制。');
+  }
+  return chunkSize;
+}
+
+function splitStringByUtf8Bytes(value, maxBytes) {
+  const chunks = [];
+  let current = '';
+  let currentBytes = 0;
+  for (const character of value) {
+    const characterBytes = Buffer.byteLength(character, 'utf8');
+    if (characterBytes > maxBytes) {
+      throw new Error(`单个字符超过 chunk-size，当前 chunk-size: ${maxBytes}`);
+    }
+    if (currentBytes + characterBytes > maxBytes && current) {
+      chunks.push(current);
+      current = '';
+      currentBytes = 0;
+    }
+    current += character;
+    currentBytes += characterBytes;
+  }
+  if (current) {
+    chunks.push(current);
+  }
+  return chunks;
+}
+
+function isRequestBodyTooLargeError(error) {
+  const message = error instanceof Error ? error.message : String(error);
+  return (
+    message.includes('HTTP 413') ||
+    message.toLowerCase().includes('length limit exceeded')
+  );
+}
+
+async function clearMigrationChunksBestEffort(options, uploadId) {
+  try {
+    const result = await callSpacetimeProcedure(
+      options,
+      'clear_database_migration_import_chunks',
+      { upload_id: uploadId },
+    );
+    ensureProcedureOk(result);
+    console.warn(`[spacetime:migration:import] 已清理失败导入的临时分片: ${uploadId}`);
+  } catch (error) {
+    console.warn(
+      `[spacetime:migration:import] 清理临时迁移分片失败: ${
+        error instanceof Error ? error.message : String(error)
+      }`,
+    );
+  }
+}
+
 async function revokeTemporaryWebIdentity(options) {
   if (!options.temporaryWebIdentity) {
     return;