first commit

grafana/dashboards/requests/node_modules/http-basic/lib/FileCache.js

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+'use strict';
+exports.__esModule = true;
+var fs = require("fs");
+var path_1 = require("path");
+var crypto_1 = require("crypto");
+function jsonParse(data, cb) {
+    var result = null;
+    try {
+        result = JSON.parse(data);
+    }
+    catch (ex) {
+        return cb(ex);
+    }
+    cb(null, result);
+}
+function getCacheKey(url) {
+    var hash = crypto_1.createHash('sha512');
+    hash.update(url);
+    return hash.digest('hex');
+}
+var FileCache = /** @class */ (function () {
+    function FileCache(location) {
+        this._location = location;
+    }
+    FileCache.prototype.getResponse = function (url, callback) {
+        var key = path_1.resolve(this._location, getCacheKey(url));
+        fs.readFile(key + '.json', 'utf8', function (err, data) {
+            if (err && err.code === 'ENOENT')
+                return callback(null, null);
+            else if (err)
+                return callback(err, null);
+            jsonParse(data, function (err, response) {
+                if (err) {
+                    return callback(err, null);
+                }
+                var body = fs.createReadStream(key + '.body');
+                response.body = body;
+                callback(null, response);
+            });
+        });
+    };
+    FileCache.prototype.setResponse = function (url, response) {
+        var key = path_1.resolve(this._location, getCacheKey(url));
+        var errored = false;
+        fs.mkdir(this._location, function (err) {
+            if (err && err.code !== 'EEXIST') {
+                console.warn('Error creating cache: ' + err.message);
+                return;
+            }
+            response.body.pipe(fs.createWriteStream(key + '.body')).on('error', function (err) {
+                errored = true;
+                console.warn('Error writing to cache: ' + err.message);
+            }).on('close', function () {
+                if (!errored) {
+                    fs.writeFile(key + '.json', JSON.stringify({
+                        statusCode: response.statusCode,
+                        headers: response.headers,
+                        requestHeaders: response.requestHeaders,
+                        requestTimestamp: response.requestTimestamp
+                    }, null, '  '), function (err) {
+                        if (err) {
+                            console.warn('Error writing to cache: ' + err.message);
+                        }
+                    });
+                }
+            });
+        });
+    };
+    FileCache.prototype.updateResponseHeaders = function (url, response) {
+        var key = path_1.resolve(this._location, getCacheKey(url));
+        fs.readFile(key + '.json', 'utf8', function (err, data) {
+            if (err) {
+                console.warn('Error writing to cache: ' + err.message);
+                return;
+            }
+            var parsed = null;
+            try {
+                parsed = JSON.parse(data);
+            }
+            catch (ex) {
+                console.warn('Error writing to cache: ' + ex.message);
+                return;
+            }
+            fs.writeFile(key + '.json', JSON.stringify({
+                statusCode: parsed.statusCode,
+                headers: response.headers,
+                requestHeaders: parsed.requestHeaders,
+                requestTimestamp: response.requestTimestamp
+            }, null, '  '), function (err) {
+                if (err) {
+                    console.warn('Error writing to cache: ' + err.message);
+                }
+            });
+        });
+    };
+    FileCache.prototype.invalidateResponse = function (url, callback) {
+        var key = path_1.resolve(this._location, getCacheKey(url));
+        fs.unlink(key + '.json', function (err) {
+            if (err && err.code === 'ENOENT')
+                return callback(null);
+            else
+                callback(err || null);
+        });
+    };
+    return FileCache;
+}());
+exports["default"] = FileCache;