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// Copyright 2023 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
import { LogSource } from '../log-source';
import { LogEntry, FieldData, Severity } from '../shared/interfaces';
import log_data from './log_data.json';
interface LevelToSeverity {
[level: number]: Severity;
}
export class JsonLogSource extends LogSource {
private intervalId: NodeJS.Timeout | null = null;
private logIndex: number = 0;
private previousLogTime: number = 0;
private logLevelToSeverity: LevelToSeverity = {
10: Severity.DEBUG,
20: Severity.INFO,
21: Severity.INFO,
30: Severity.WARNING,
40: Severity.ERROR,
50: Severity.CRITICAL,
70: Severity.CRITICAL,
};
private nonAdditionalDataFields = [
'_hosttime',
'levelname',
'levelno',
'args',
'fields',
'message',
'time',
];
constructor() {
super();
}
start(): void {
this.updateLogTime();
const getInterval = () => {
// Get the current log time
const next_log_time = Number(log_data[this.logIndex].time);
const wait_ms = 1000 * (next_log_time - this.previousLogTime);
this.updateLogTime();
return Math.round(wait_ms);
};
const readLogEntry = () => {
const logEntry = this.readLogEntryFromJson();
this.emitEvent('logEntry', logEntry);
const nextInterval = getInterval();
setTimeout(readLogEntry, nextInterval);
};
readLogEntry();
}
stop(): void {
if (this.intervalId) {
clearInterval(this.intervalId);
this.intervalId = null;
}
}
private updateLogTime(): void {
this.previousLogTime = Number(log_data[this.logIndex].time);
}
private updateLogIndex(): void {
this.logIndex += 1;
if (this.logIndex >= log_data.length) {
this.logIndex = 0;
}
}
readLogEntryFromJson(): LogEntry {
const data = log_data[this.logIndex];
const host_log_time = new Date(0); // Date set to epoch seconds 0
const host_log_epoch_seconds = Number(data.time);
host_log_time.setUTCSeconds(Math.trunc(host_log_epoch_seconds));
const host_log_epoch_milliseconds = Math.trunc(
1000 * (host_log_epoch_seconds - Math.trunc(host_log_epoch_seconds)),
);
host_log_time.setUTCMilliseconds(host_log_epoch_milliseconds);
const fields: Array<FieldData> = [
{ key: 'severity', value: this.logLevelToSeverity[data.levelno] },
{ key: 'time', value: host_log_time },
];
Object.keys(data.fields).forEach((columnName) => {
if (this.nonAdditionalDataFields.indexOf(columnName) === -1) {
// @ts-ignore
fields.push({ key: columnName, value: data.fields[columnName] });
}
});
fields.push({ key: 'message', value: data.message });
fields.push({ key: 'py_file', value: data.py_file || '' });
fields.push({ key: 'py_logger', value: data.py_logger || '' });
const logEntry: LogEntry = {
severity: this.logLevelToSeverity[data.levelno],
timestamp: new Date(),
fields: fields,
};
this.updateLogIndex();
return logEntry;
}
}
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