diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b512c09
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+node_modules
\ No newline at end of file
diff --git a/index.js b/index.js
new file mode 100644
index 0000000..f5b97a8
--- /dev/null
+++ b/index.js
@@ -0,0 +1,44 @@
+const Koa = require('koa');
+const Router = require('koa-router');
+const redisCli = require('./util/client');
+const db = require('./util/db');
+
+const app = new Koa();
+const router = new Router();
+
+const PORT = 3000;
+const CACHE_KEY = 'cache-top5';
+
+router.get('/', async (ctx, next) => {
+    await next();
+    redisCli.set('testcli', '我只是想看看封装的能不能用着了', 'EX', 3600);
+    ctx.body = `It's OK! ${PORT}`
+});
+
+router.get('/cache', async (ctx, next) => {
+    await next();
+
+    let top5 = await redisCli.get(CACHE_KEY);
+    if(!top5) {
+        top5 = await db.query('select * from websites limit 5');
+        console.log('get db: ', top5.length);
+        if(await redisCli.checkLock(CACHE_KEY)) {
+            ctx.body = top5;
+        }
+        try {
+            await redisCli.set(CACHE_KEY, JSON.stringify(top5), 'PX', 360000);
+        } catch (err) {
+            console.log(`redisCli set err: ${err}`);
+            ctx.body = top5;
+        }
+    }
+
+    console.log('get cache: ', top5.length);
+    ctx.body = top5;
+});
+
+app.use(router.routes()).use(router.allowedMethods());
+
+app.listen(PORT, () => {
+    console.log(`listening http://localhost:${PORT}`);
+});
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..0b6c0dd
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,423 @@
+{
+  "name": "homework-cache",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "accepts": {
+      "version": "1.3.7",
+      "resolved": "https://registry.npm.taobao.org/accepts/download/accepts-1.3.7.tgz",
+      "integrity": "sha1-UxvHJlF6OytB+FACHGzBXqq1B80=",
+      "requires": {
+        "mime-types": "~2.1.24",
+        "negotiator": "0.6.2"
+      }
+    },
+    "any-promise": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npm.taobao.org/any-promise/download/any-promise-1.3.0.tgz",
+      "integrity": "sha1-q8av7tzqUugJzcA3au0845Y10X8="
+    },
+    "bignumber.js": {
+      "version": "7.2.1",
+      "resolved": "https://registry.npm.taobao.org/bignumber.js/download/bignumber.js-7.2.1.tgz",
+      "integrity": "sha1-gMBIdZ2CaACAfEv9Uh5Q7bulel8="
+    },
+    "cache-content-type": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npm.taobao.org/cache-content-type/download/cache-content-type-1.0.1.tgz",
+      "integrity": "sha1-A1zeKwjuISn0qDFeqPAKANuhRTw=",
+      "requires": {
+        "mime-types": "^2.1.18",
+        "ylru": "^1.2.0"
+      }
+    },
+    "co": {
+      "version": "4.6.0",
+      "resolved": "http://registry.npm.taobao.org/co/download/co-4.6.0.tgz",
+      "integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ="
+    },
+    "content-disposition": {
+      "version": "0.5.3",
+      "resolved": "http://registry.npm.taobao.org/content-disposition/download/content-disposition-0.5.3.tgz",
+      "integrity": "sha1-4TDK9+cnkIfFYWwgB9BIVpiYT70=",
+      "requires": {
+        "safe-buffer": "5.1.2"
+      }
+    },
+    "content-type": {
+      "version": "1.0.4",
+      "resolved": "http://registry.npm.taobao.org/content-type/download/content-type-1.0.4.tgz",
+      "integrity": "sha1-4TjMdeBAxyexlm/l5fjJruJW/js="
+    },
+    "cookies": {
+      "version": "0.7.3",
+      "resolved": "https://registry.npm.taobao.org/cookies/download/cookies-0.7.3.tgz",
+      "integrity": "sha1-eRLOIfvy6MLacM8cPzUa7PWdrfo=",
+      "requires": {
+        "depd": "~1.1.2",
+        "keygrip": "~1.0.3"
+      }
+    },
+    "core-util-is": {
+      "version": "1.0.2",
+      "resolved": "http://registry.npm.taobao.org/core-util-is/download/core-util-is-1.0.2.tgz",
+      "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac="
+    },
+    "debug": {
+      "version": "3.1.0",
+      "resolved": "http://registry.npm.taobao.org/debug/download/debug-3.1.0.tgz",
+      "integrity": "sha1-W7WgZyYotkFJVmuhaBnmFRjGcmE=",
+      "requires": {
+        "ms": "2.0.0"
+      }
+    },
+    "deep-equal": {
+      "version": "1.0.1",
+      "resolved": "http://registry.npm.taobao.org/deep-equal/download/deep-equal-1.0.1.tgz",
+      "integrity": "sha1-9dJgKStmDghO/0zbyfCK0yR0SLU="
+    },
+    "delegates": {
+      "version": "1.0.0",
+      "resolved": "http://registry.npm.taobao.org/delegates/download/delegates-1.0.0.tgz",
+      "integrity": "sha1-hMbhWbgZBP3KWaDvRM2HDTElD5o="
+    },
+    "depd": {
+      "version": "1.1.2",
+      "resolved": "http://registry.npm.taobao.org/depd/download/depd-1.1.2.tgz",
+      "integrity": "sha1-m81S4UwJd2PnSbJ0xDRu0uVgtak="
+    },
+    "destroy": {
+      "version": "1.0.4",
+      "resolved": "http://registry.npm.taobao.org/destroy/download/destroy-1.0.4.tgz",
+      "integrity": "sha1-l4hXRCxEdJ5CBmE+N5RiBYJqvYA="
+    },
+    "double-ended-queue": {
+      "version": "2.1.0-0",
+      "resolved": "https://registry.npm.taobao.org/double-ended-queue/download/double-ended-queue-2.1.0-0.tgz",
+      "integrity": "sha1-ED01J/0xUo9AGIEwyEHv3XgmTlw="
+    },
+    "ee-first": {
+      "version": "1.1.1",
+      "resolved": "http://registry.npm.taobao.org/ee-first/download/ee-first-1.1.1.tgz",
+      "integrity": "sha1-WQxhFWsK4vTwJVcyoViyZrxWsh0="
+    },
+    "error-inject": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npm.taobao.org/error-inject/download/error-inject-1.0.0.tgz",
+      "integrity": "sha1-4rPZG1Su1nLzCdlQ0VSFD6EdTzc="
+    },
+    "escape-html": {
+      "version": "1.0.3",
+      "resolved": "http://registry.npm.taobao.org/escape-html/download/escape-html-1.0.3.tgz",
+      "integrity": "sha1-Aljq5NPQwJdN4cFpGI7wBR0dGYg="
+    },
+    "fresh": {
+      "version": "0.5.2",
+      "resolved": "http://registry.npm.taobao.org/fresh/download/fresh-0.5.2.tgz",
+      "integrity": "sha1-PYyt2Q2XZWn6g1qx+OSyOhBWBac="
+    },
+    "http-assert": {
+      "version": "1.4.1",
+      "resolved": "https://registry.npm.taobao.org/http-assert/download/http-assert-1.4.1.tgz",
+      "integrity": "sha1-xfcl1neqfoc+9zYZm4lobM6zeHg=",
+      "requires": {
+        "deep-equal": "~1.0.1",
+        "http-errors": "~1.7.2"
+      }
+    },
+    "http-errors": {
+      "version": "1.7.3",
+      "resolved": "https://registry.npm.taobao.org/http-errors/download/http-errors-1.7.3.tgz",
+      "integrity": "sha1-bGGeT5xgMIw4UZSYwU+7EKrOuwY=",
+      "requires": {
+        "depd": "~1.1.2",
+        "inherits": "2.0.4",
+        "setprototypeof": "1.1.1",
+        "statuses": ">= 1.5.0 < 2",
+        "toidentifier": "1.0.0"
+      }
+    },
+    "inherits": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npm.taobao.org/inherits/download/inherits-2.0.4.tgz",
+      "integrity": "sha1-D6LGT5MpF8NDOg3tVTY6rjdBa3w="
+    },
+    "is-generator-function": {
+      "version": "1.0.7",
+      "resolved": "https://registry.npm.taobao.org/is-generator-function/download/is-generator-function-1.0.7.tgz",
+      "integrity": "sha1-0hMuUpuwAAp/gHlNS99c1eWBNSI="
+    },
+    "isarray": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npm.taobao.org/isarray/download/isarray-0.0.1.tgz?cache=0&sync_timestamp=1562592096220&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fisarray%2Fdownload%2Fisarray-0.0.1.tgz",
+      "integrity": "sha1-ihis/Kmo9Bd+Cav8YDiTmwXR7t8="
+    },
+    "keygrip": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npm.taobao.org/keygrip/download/keygrip-1.0.3.tgz",
+      "integrity": "sha1-OZ1wnwrtK6sKBZ4M3TpQI6BT4dw="
+    },
+    "koa": {
+      "version": "2.7.0",
+      "resolved": "https://registry.npm.taobao.org/koa/download/koa-2.7.0.tgz",
+      "integrity": "sha1-fgCENQaUK52CxswzdJ9lfG5eet8=",
+      "requires": {
+        "accepts": "^1.3.5",
+        "cache-content-type": "^1.0.0",
+        "content-disposition": "~0.5.2",
+        "content-type": "^1.0.4",
+        "cookies": "~0.7.1",
+        "debug": "~3.1.0",
+        "delegates": "^1.0.0",
+        "depd": "^1.1.2",
+        "destroy": "^1.0.4",
+        "error-inject": "^1.0.0",
+        "escape-html": "^1.0.3",
+        "fresh": "~0.5.2",
+        "http-assert": "^1.3.0",
+        "http-errors": "^1.6.3",
+        "is-generator-function": "^1.0.7",
+        "koa-compose": "^4.1.0",
+        "koa-convert": "^1.2.0",
+        "koa-is-json": "^1.0.0",
+        "on-finished": "^2.3.0",
+        "only": "~0.0.2",
+        "parseurl": "^1.3.2",
+        "statuses": "^1.5.0",
+        "type-is": "^1.6.16",
+        "vary": "^1.1.2"
+      }
+    },
+    "koa-compose": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npm.taobao.org/koa-compose/download/koa-compose-4.1.0.tgz",
+      "integrity": "sha1-UHMGuTcZAdtBEhyBLpI9DWfT6Hc="
+    },
+    "koa-convert": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npm.taobao.org/koa-convert/download/koa-convert-1.2.0.tgz",
+      "integrity": "sha1-2kCHXfSd4FOQmNFwC1CCDOvNIdA=",
+      "requires": {
+        "co": "^4.6.0",
+        "koa-compose": "^3.0.0"
+      },
+      "dependencies": {
+        "koa-compose": {
+          "version": "3.2.1",
+          "resolved": "https://registry.npm.taobao.org/koa-compose/download/koa-compose-3.2.1.tgz",
+          "integrity": "sha1-qFzLQLfZhtjlo0Wzoazo6rz1Tec=",
+          "requires": {
+            "any-promise": "^1.1.0"
+          }
+        }
+      }
+    },
+    "koa-is-json": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npm.taobao.org/koa-is-json/download/koa-is-json-1.0.0.tgz",
+      "integrity": "sha1-JzwH7c3Ljfaiwat9We52SRRR7BQ="
+    },
+    "koa-router": {
+      "version": "7.4.0",
+      "resolved": "https://registry.npm.taobao.org/koa-router/download/koa-router-7.4.0.tgz",
+      "integrity": "sha1-ruH3rcAtXLMdfWdGXJ6syCXoxeA=",
+      "requires": {
+        "debug": "^3.1.0",
+        "http-errors": "^1.3.1",
+        "koa-compose": "^3.0.0",
+        "methods": "^1.0.1",
+        "path-to-regexp": "^1.1.1",
+        "urijs": "^1.19.0"
+      },
+      "dependencies": {
+        "koa-compose": {
+          "version": "3.2.1",
+          "resolved": "https://registry.npm.taobao.org/koa-compose/download/koa-compose-3.2.1.tgz",
+          "integrity": "sha1-qFzLQLfZhtjlo0Wzoazo6rz1Tec=",
+          "requires": {
+            "any-promise": "^1.1.0"
+          }
+        }
+      }
+    },
+    "media-typer": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npm.taobao.org/media-typer/download/media-typer-0.3.0.tgz",
+      "integrity": "sha1-hxDXrwqmJvj/+hzgAWhUUmMlV0g="
+    },
+    "methods": {
+      "version": "1.1.2",
+      "resolved": "http://registry.npm.taobao.org/methods/download/methods-1.1.2.tgz",
+      "integrity": "sha1-VSmk1nZUE07cxSZmVoNbD4Ua/O4="
+    },
+    "mime-db": {
+      "version": "1.40.0",
+      "resolved": "http://registry.npm.taobao.org/mime-db/download/mime-db-1.40.0.tgz",
+      "integrity": "sha1-plBX6ZjbCQ9zKmj2wnbTh9QSbDI="
+    },
+    "mime-types": {
+      "version": "2.1.24",
+      "resolved": "http://registry.npm.taobao.org/mime-types/download/mime-types-2.1.24.tgz",
+      "integrity": "sha1-tvjQs+lR77d97eyhlM/20W9nb4E=",
+      "requires": {
+        "mime-db": "1.40.0"
+      }
+    },
+    "ms": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npm.taobao.org/ms/download/ms-2.0.0.tgz?cache=0&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fms%2Fdownload%2Fms-2.0.0.tgz",
+      "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
+    },
+    "mysql": {
+      "version": "2.17.1",
+      "resolved": "https://registry.npm.taobao.org/mysql/download/mysql-2.17.1.tgz",
+      "integrity": "sha1-YrukoDmpsvc2OM0WUs5Q/G9oKJk=",
+      "requires": {
+        "bignumber.js": "7.2.1",
+        "readable-stream": "2.3.6",
+        "safe-buffer": "5.1.2",
+        "sqlstring": "2.3.1"
+      }
+    },
+    "negotiator": {
+      "version": "0.6.2",
+      "resolved": "https://registry.npm.taobao.org/negotiator/download/negotiator-0.6.2.tgz",
+      "integrity": "sha1-/qz3zPUlp3rpY0Q2pkiD/+yjRvs="
+    },
+    "on-finished": {
+      "version": "2.3.0",
+      "resolved": "http://registry.npm.taobao.org/on-finished/download/on-finished-2.3.0.tgz",
+      "integrity": "sha1-IPEzZIGwg811M3mSoWlxqi2QaUc=",
+      "requires": {
+        "ee-first": "1.1.1"
+      }
+    },
+    "only": {
+      "version": "0.0.2",
+      "resolved": "https://registry.npm.taobao.org/only/download/only-0.0.2.tgz",
+      "integrity": "sha1-Kv3oTQPlC5qO3EROMGEKcCle37Q="
+    },
+    "parseurl": {
+      "version": "1.3.3",
+      "resolved": "http://registry.npm.taobao.org/parseurl/download/parseurl-1.3.3.tgz",
+      "integrity": "sha1-naGee+6NEt/wUT7Vt2lXeTvC6NQ="
+    },
+    "path-to-regexp": {
+      "version": "1.7.0",
+      "resolved": "http://registry.npm.taobao.org/path-to-regexp/download/path-to-regexp-1.7.0.tgz",
+      "integrity": "sha1-Wf3g9DW62suhA6hOnTvGTpa5k30=",
+      "requires": {
+        "isarray": "0.0.1"
+      }
+    },
+    "process-nextick-args": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npm.taobao.org/process-nextick-args/download/process-nextick-args-2.0.1.tgz",
+      "integrity": "sha1-eCDZsWEgzFXKmud5JoCufbptf+I="
+    },
+    "readable-stream": {
+      "version": "2.3.6",
+      "resolved": "https://registry.npm.taobao.org/readable-stream/download/readable-stream-2.3.6.tgz?cache=0&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Freadable-stream%2Fdownload%2Freadable-stream-2.3.6.tgz",
+      "integrity": "sha1-sRwn2IuP8fvgcGQ8+UsMea4bCq8=",
+      "requires": {
+        "core-util-is": "~1.0.0",
+        "inherits": "~2.0.3",
+        "isarray": "~1.0.0",
+        "process-nextick-args": "~2.0.0",
+        "safe-buffer": "~5.1.1",
+        "string_decoder": "~1.1.1",
+        "util-deprecate": "~1.0.1"
+      },
+      "dependencies": {
+        "isarray": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npm.taobao.org/isarray/download/isarray-1.0.0.tgz?cache=0&sync_timestamp=1562592096220&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fisarray%2Fdownload%2Fisarray-1.0.0.tgz",
+          "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE="
+        }
+      }
+    },
+    "redis": {
+      "version": "2.8.0",
+      "resolved": "https://registry.npm.taobao.org/redis/download/redis-2.8.0.tgz",
+      "integrity": "sha1-ICKI4/WMSfYHnZevehDhMDrhSwI=",
+      "requires": {
+        "double-ended-queue": "^2.1.0-0",
+        "redis-commands": "^1.2.0",
+        "redis-parser": "^2.6.0"
+      }
+    },
+    "redis-commands": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npm.taobao.org/redis-commands/download/redis-commands-1.5.0.tgz",
+      "integrity": "sha1-gNLiBpj+aI8icSf/nlFkp90X54U="
+    },
+    "redis-parser": {
+      "version": "2.6.0",
+      "resolved": "https://registry.npm.taobao.org/redis-parser/download/redis-parser-2.6.0.tgz",
+      "integrity": "sha1-Uu0J2srBCPGmMcB+m2mUHnoZUEs="
+    },
+    "safe-buffer": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npm.taobao.org/safe-buffer/download/safe-buffer-5.1.2.tgz",
+      "integrity": "sha1-mR7GnSluAxN0fVm9/St0XDX4go0="
+    },
+    "setprototypeof": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npm.taobao.org/setprototypeof/download/setprototypeof-1.1.1.tgz",
+      "integrity": "sha1-fpWsskqpL1iF4KvvW6ExMw1K5oM="
+    },
+    "sqlstring": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npm.taobao.org/sqlstring/download/sqlstring-2.3.1.tgz",
+      "integrity": "sha1-R1OT/56RR5rqYtyvDKPRSYOn+0A="
+    },
+    "statuses": {
+      "version": "1.5.0",
+      "resolved": "http://registry.npm.taobao.org/statuses/download/statuses-1.5.0.tgz",
+      "integrity": "sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow="
+    },
+    "string_decoder": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npm.taobao.org/string_decoder/download/string_decoder-1.1.1.tgz?cache=0&sync_timestamp=1565170823020&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fstring_decoder%2Fdownload%2Fstring_decoder-1.1.1.tgz",
+      "integrity": "sha1-nPFhG6YmhdcDCunkujQUnDrwP8g=",
+      "requires": {
+        "safe-buffer": "~5.1.0"
+      }
+    },
+    "toidentifier": {
+      "version": "1.0.0",
+      "resolved": "http://registry.npm.taobao.org/toidentifier/download/toidentifier-1.0.0.tgz",
+      "integrity": "sha1-fhvjRw8ed5SLxD2Uo8j013UrpVM="
+    },
+    "type-is": {
+      "version": "1.6.18",
+      "resolved": "https://registry.npm.taobao.org/type-is/download/type-is-1.6.18.tgz",
+      "integrity": "sha1-TlUs0F3wlGfcvE73Od6J8s83wTE=",
+      "requires": {
+        "media-typer": "0.3.0",
+        "mime-types": "~2.1.24"
+      }
+    },
+    "urijs": {
+      "version": "1.19.1",
+      "resolved": "https://registry.npm.taobao.org/urijs/download/urijs-1.19.1.tgz",
+      "integrity": "sha1-Ww/1MMDL3oOG9jQiNbpcpumV0lo="
+    },
+    "util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "http://registry.npm.taobao.org/util-deprecate/download/util-deprecate-1.0.2.tgz",
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
+    },
+    "vary": {
+      "version": "1.1.2",
+      "resolved": "http://registry.npm.taobao.org/vary/download/vary-1.1.2.tgz",
+      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
+    },
+    "ylru": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npm.taobao.org/ylru/download/ylru-1.2.1.tgz",
+      "integrity": "sha1-9Xa2M0FUeYnB3nuiiHYJI7J/6E8="
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..3fe0552
--- /dev/null
+++ b/package.json
@@ -0,0 +1,30 @@
+{
+  "name": "homework-cache",
+  "version": "1.0.0",
+  "description": "redis homework-cache.",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/xiaoyexiang/homework-cache.git"
+  },
+  "keywords": [
+    "redis",
+    "mysql",
+    "cache"
+  ],
+  "author": "yezi",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/xiaoyexiang/homework-cache/issues"
+  },
+  "homepage": "https://github.com/xiaoyexiang/homework-cache#readme",
+  "dependencies": {
+    "koa": "^2.7.0",
+    "koa-router": "^7.4.0",
+    "mysql": "^2.17.1",
+    "redis": "^2.8.0"
+  }
+}
diff --git a/util/client.js b/util/client.js
new file mode 100644
index 0000000..f7733e8
--- /dev/null
+++ b/util/client.js
@@ -0,0 +1,93 @@
+//引入redis
+const redis = require('redis');
+
+// 连接redis服务器
+client = redis.createClient({
+    host: '127.0.0.1',
+     port: 6379,
+});
+
+//错误监听？
+client.on('error', function (err) {
+    console.log('error: ', err);
+});
+
+client.on('connect', function() {
+    console.log('Redis 连接成功！')
+});
+
+const REDIS_LOCK_KEY = 'cache-lock:';
+
+const redisSet = async (key, value, exp, time) => {
+    const lockKey = REDIS_LOCK_KEY + key;
+    await redisLock(lockKey);
+    return new Promise((resolve, reject) => {
+        client.set(key, value, exp, time, async (err, result) => {
+            console.log('---------------- redisSet -----------------');
+            await redisUnlock(lockKey);
+            err ? reject(err) : resolve(result);
+        })
+    })
+};
+
+const redisGet = key => {
+    return new Promise((resolve, reject) => {
+        client.get(key, (err, result) => {
+            console.log('---------------- redisGet -----------------');
+            if(err) reject(err);
+            else {
+                try {
+                    result = JSON.parse(result);
+                    resolve(result);
+                } catch (err) {
+                    console.log('err: ', err);
+                    resolve(result);
+                }
+            }
+        })
+    })
+};
+
+// 锁成功返回1，已锁返回0
+const redisLock = (key) => {
+    return new Promise((resolve, reject) => {
+        console.log('---------------- redisLock -----------------');
+        client.setnx(key, Date.now(), (err, islock) => {
+            if (err) reject(err);
+            else resolve(islock);
+        })
+    })
+}
+
+const redisCheckLock = (key) => {
+    const lockKey = REDIS_LOCK_KEY + key;
+
+    return new Promise((resolve, reject) => {
+        console.log('---------------- redisCheckLock -----------------');
+        client.get(lockKey, (err, result) => {
+            if(err) reject(err);
+            else {
+                resolve(result);
+            }
+        })
+    })
+}
+
+// 解锁成功返回1，已锁返回0
+const redisUnlock = (key) => {
+    return new Promise((resolve, reject) => {
+        console.log('---------------- redisUnlock -----------------');
+        client.del(key, (err, data) => {
+            if (err) reject(err)
+            else resolve(data)
+        });
+    });
+}
+
+module.exports = {
+    set: redisSet,
+    get: redisGet,
+    lock: redisLock,
+    checkLock: redisCheckLock,
+    unlock: redisUnlock,
+};
\ No newline at end of file
diff --git a/util/db.js b/util/db.js
new file mode 100644
index 0000000..37d8d25
--- /dev/null
+++ b/util/db.js
@@ -0,0 +1,34 @@
+const mysql = require('mysql')
+
+const pool = mysql.createPool({
+  host     :  '127.0.0.1',
+  user     :  'root',
+  password :  '1111122963',
+  database :  'test'
+})
+
+let query = function( sql, values ) {
+
+  return new Promise(( resolve, reject ) => {
+    pool.getConnection(function(err, connection) {
+      if (err) {
+        reject( err )
+      } else {
+        connection.query(sql, values, ( err, rows) => {
+
+          if ( err ) {
+            reject( err )
+          } else {
+            resolve( rows )
+          }
+          connection.release()
+        })
+      }
+    })
+  })
+
+}
+
+module.exports = {
+  query: query,
+}
\ No newline at end of file