@browser-bunyan/server-stream/lib/index.cjs.map

Bunyan stream for batching and sending log records to a server

{"version":3,"file":"index.cjs","sources":["../src/index.js"],"sourcesContent":["const userAgent = typeof window !== 'undefined' ? window.navigator.userAgent : 'no-window';\nconst isBot = /bot|crawler|spider|crawling/i.test(userAgent);\n\nconst defaultHeaders = { 'Content-Type': 'application/json' };\n\nexport class ServerStream {\n\n    constructor(opts = {}) {\n        const {\n            method = 'PUT',\n            url = '/log',\n            headers = {},\n            throttleInterval = 3000,\n            withCredentials = false,\n            onError,\n            flushOnClose = false,\n            writeCondition = ServerStream.defaultWriteCondition,\n        } = opts;\n\n        this.writeCondition = writeCondition;\n        this.records = {};\n\n        this.headers = { ...defaultHeaders, ...headers };\n\n        this.start({ method, url, throttleInterval, withCredentials, onError });\n\n        if (flushOnClose && typeof window.fetch !== 'undefined') {\n            // TODO: look at page visibility api here\n            // https://github.com/GoogleChromeLabs/page-lifecycle\n            window.addEventListener('beforeunload', () => {\n                if (this.currentThrottleTimeout) {\n                    window.clearTimeout(this.currentThrottleTimeout);\n                }\n                const recs = this.recordsAsArray();\n                if (recs.length) {\n                    // swapped sendBeacon for fetch as discussed here:\n                    // https://stackoverflow.com/questions/55421459/http-request-beforeunload-sendbeacon-vs-img-src\n                    window.fetch(url, {\n                        method,\n                        body: JSON.stringify(recs),\n                        headers: this.headers,\n                        credentials: withCredentials ? 'include' : 'same-origin',\n                        mode: 'cors',\n                        keepalive: true,\n                    });\n                }\n            }, false);\n        }\n    }\n\n    start({ method, url, throttleInterval, withCredentials, onError }) {\n        const throttleRequests = () => {\n            // wait for any errors to accumulate\n            this.currentThrottleTimeout = setTimeout(() => {\n                const recs = this.recordsAsArray();\n                if (recs.length) {\n                    const xhr = new XMLHttpRequest();\n                    xhr.onreadystatechange = () => {\n                        if (xhr.readyState === XMLHttpRequest.DONE) {\n                            if (xhr.status >= 400) {\n                                if (typeof onError === 'function') {\n                                    onError.call(this, recs, xhr);\n                                } else {\n                                    console.warn('Browser Bunyan: A server log write failed');\n                                }\n                            }\n                            this.records = {};\n                            throttleRequests();\n                        }\n                    };\n                    xhr.open(method, url);\n                    for (const [name, value] of Object.entries(this.headers)) {\n                        xhr.setRequestHeader(name, value);\n                    }\n                    xhr.withCredentials = withCredentials;\n                    xhr.send(JSON.stringify(recs));\n                } else {\n                    throttleRequests();\n                }\n            }, throttleInterval);\n        };\n\n        throttleRequests();\n    }\n\n    stop() {\n        setTimeout(() => {\n            if (this.currentThrottleTimeout) {\n                clearTimeout(this.currentThrottleTimeout);\n                this.currentThrottleTimeout = null;\n            }\n        }, 1);\n    }\n\n    write(rec) {\n        rec.url = typeof window !== 'undefined' && window.location.href;\n        rec.userAgent = userAgent;\n        if (this.currentThrottleTimeout && this.writeCondition(rec)) {\n            if (this.records[rec.msg]) {\n                this.records[rec.msg].count++;\n            } else {\n                rec.count = 1;\n                this.records[rec.msg] = rec;\n            }\n        }\n    }\n\n    recordsAsArray() {\n        return Object.keys(this.records).map(errKey => this.records[errKey]);\n    }\n\n    static defaultWriteCondition() {\n        return window.navigator.onLine && !isBot;\n    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