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411 lines (372 loc) · 12.5 KB
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var aws = require('aws-sdk');
require('./constants');
var common = require('./common');
var async = require('async');
var debug = true;
var dynamoDB;
var s3;
var debug = (process.env['DEBUG'] === 'true');
var log_level = process.env['LOG_LEVEL'] || 'info';
const winston = require('winston');
const logger = winston.createLogger({
level: debug === true ? 'debug' : log_level,
transports: [
new winston.transports.Console({
format: winston.format.simple()
})
]
});
/**
* Initialisation for the module - connect to DDB etc
*
* @param setRegion
* @returns
*/
function init(setRegion) {
// connect to dynamo if we haven't already
if (!dynamoDB) {
dynamoDB = new aws.DynamoDB({
apiVersion: '2012-08-10',
region: setRegion
});
}
if (!s3) {
// create an S3 client for the region to hand to the in-place copy processor
s3 = new aws.S3({
apiVersion: '2006-03-01',
region: setRegion
});
}
}
/**
* Validate that dates are given as a number
*
* @param forValue
* @returns
*/
function getDate(forValue) {
var dt = parseInt(forValue);
if (isNaN(dt)) {
throw new Error(forValue + " is not a valid epoch seconds value");
} else {
return dt;
}
}
function getBatch(setRegion, s3Prefix, batchId, callback) {
init(setRegion);
var getBatch = {
Key: {
"batchId": {
S: batchId,
},
"s3Prefix": {
S: s3Prefix
}
},
TableName: batchTable,
ConsistentRead: true
};
dynamoDB.getItem(getBatch, function (err, data) {
if (err) {
callback(err);
} else {
if (data && data.Item) {
callback(null, data.Item);
} else {
callback("No Batch " + batchId + " for prefix " + s3Prefix + " found in " + setRegion);
}
}
});
}
exports.getBatch = getBatch;
/**
* Function which performs a batch query with the provided arguments
*
* @param setRegion
* @param batchStatus
* @param queryStartDate
* @param queryEndDate
* @param callback
* @returns
*/
function doQuery(setRegion, batchStatus, queryStartDate, queryEndDate, callback) {
init(setRegion);
if (queryStartDate) {
var startDate = getDate(queryStartDate);
}
if (queryEndDate) {
var endDate = getDate(queryEndDate);
}
queryParams = {
TableName: batchTable,
IndexName: batchStatusGSI
};
// add the batch status
var keyConditionExpression = "#s = :batchStatus";
var keyConditionNames = {
"#s": "status"
};
var keyConditionValues = {
":batchStatus": {
'S': batchStatus
}
};
// add the start date, if provided
if (startDate && !endDate) {
keyConditionExpression += " and lastUpdate >= :startDate";
keyConditionValues[":startDate"] = {
"N": "" + startDate
};
} else if (!startDate && endDate) {
keyConditionExpression += " and lastUpdate <= :endDate";
keyConditionValues[":endDate"] = {
"N": "" + endDate
};
} else if (startDate && endDate) {
keyConditionExpression += " and lastUpdate between :startDate and :endDate";
keyConditionValues[":startDate"] = {
"N": "" + startDate
};
keyConditionValues[":endDate"] = {
"N": "" + endDate
};
} // else we have neither so ignore
// add the query expressions to the query item
queryParams.KeyConditionExpression = keyConditionExpression;
queryParams.ExpressionAttributeNames = keyConditionNames;
queryParams.ExpressionAttributeValues = keyConditionValues;
if (debug == true) {
console.log(queryParams);
}
dynamoDB.query(queryParams, function (err, data) {
if (err) {
logger.error(err);
process.exit(ERROR);
} else {
if (data && data.Items) {
var itemsToShow = [];
data.Items.map(function (item) {
toShow = {
s3Prefix: item.s3Prefix.S,
batchId: item.batchId.S,
status: item.status.S,
lastUpdateDate: common.readableTime(item.lastUpdate.N),
lastUpdate: item.lastUpdate.N
};
itemsToShow.push(toShow);
});
callback(null, itemsToShow);
} else {
callback(null, []);
}
}
});
}
exports.doQuery = doQuery;
/**
* Function to delete a specific batch from DynamoDB LambdaRedshiftBatches table
*
* @param batchId
* @param callback
* @returns
*/
function deleteBatch(s3Prefix, batchId, callback) {
var deleteParams = {
TableName: batchTable,
Key: {
"s3Prefix": {
"S": s3Prefix
},
"batchId": {
"S": batchId
}
},
ReturnValues: 'ALL_OLD'
}
dynamoDB.deleteItem(deleteParams, function (err, data) {
if (err) {
callback(err);
} else {
// create the response object
var response = {
"lastUpdateDate": common.readableTime(data.Attributes.lastUpdate.N),
};
// map in all the old values that we received to the response
Object.keys(data.Attributes).map(function (key) {
response[key] = data.Attributes[key];
});
callback(null, response);
}
})
}
exports.deleteBatch = deleteBatch;
function deleteBatches(setRegion, batchStatus, startDate, endDate, dryRun, callback) {
init(setRegion);
// query for batches in the range we require
doQuery(setRegion, batchStatus, startDate, endDate, function (err, data) {
if (err) {
callback(err);
} else {
if (dryRun && !JSON.parse(dryRun)) {
logger.info("Deleting " + data.length + " Batches in status " + batchStatus);
async.map(data, function (batchItem, asyncCallback) {
// pass the request through the function that deletes the
// item from DynamoDB
deleteBatch(batchItem.s3Prefix, batchItem.batchId, function (err, data) {
if (err) {
asyncCallback(err);
} else {
asyncCallback(null, data);
}
});
}, function (err, results) {
if (err) {
callback(err);
} else {
// deletions are completed
callback(null, {
batchCountDeleted: results.length,
batchesDeleted: results
});
}
});
} else {
logger.info("Dry run only - no batches will be modified");
logger.info("Resolved " + data.length + " Batches for Deletion");
callback(null, {
batchCountDeleted: 0,
batchesDeleted: data
});
}
}
});
}
exports.deleteBatches = deleteBatches;
/*
Function to reprocess an existing batch that is in a failed locked state, or an error state where the issue has been mitigated
*/
function reprocessBatch(s3Prefix, batchId, region, omitFiles, callback) {
init(region);
STATUS_REPROCESSING = 'reprocessing';
getBatch(region, s3Prefix, batchId, function (err, data) {
if (err) {
callback(err);
} else {
if (data) {
if (!data.entries.SS) {
msg = "Batch is Empty!";
logger.info(msg);
callback(msg);
} else if (data.status.S === open) {
msg = "Cannot reprocess an Open Batch";
logger.error(msg);
callback(msg);
} else {
// the batch to be unlocked must be in locked or error state - we
// can't reopen 'complete' batches
preconditionStatus = [{
S: 'locked'
}, {
S: 'error'
}];
// set the batch to 'reprocessing' status
updateBatchStatus(s3Prefix, batchId, STATUS_REPROCESSING, preconditionStatus, "Reprocessing initiated by reprocessBatch request", function (err) {
if (err) {
if (err.code === conditionCheckFailed) {
callback("Batch to be reprocessed must either be Locked or Error status")
} else {
callback(err);
}
} else {
// create a list of files which filters out the omittedFiles
var processFiles = [];
if (omitFiles) {
data.entries.SS.map(function (item) {
if (omitFiles.indexOf(item) === -1) {
// file is not in the omit list, so add it to the process list
processFiles.push(item);
}
});
} else {
processFiles = data.entries.SS;
}
// for each of the current file entries, execute the processedFiles reprocess method
var fileReprocessor = common.reprocessFile.bind(undefined, dynamoDB, s3, region);
async.map(processFiles, fileReprocessor, function (err) {
if (err) {
callback(err);
} else {
var preconditionStatus = [{
S: STATUS_REPROCESSING
}];
// files have been reprocessed, so now set the batch status to reprocessed to indicate that it is closed
updateBatchStatus(s3Prefix, batchId, 'reprocessed', preconditionStatus, undefined, function (err) {
callback(err);
});
}
});
}
});
}
} else {
msg = "Unable to retrieve batch " + batchId + " for prefix " + s3Prefix;
logger.error(msg);
callback(msg);
}
}
});
}
exports.reprocessBatch = reprocessBatch;
function updateBatchStatus(s3Prefix, thisBatchId, status, requireStatusArray, updateReason, callback) {
var updateBatchStatus = {
Key: {
batchId: {
S: thisBatchId,
},
s3Prefix: {
S: s3Prefix
}
},
TableName: batchTable,
AttributeUpdates: {
status: {
Action: 'PUT',
Value: {
S: status
}
},
lastUpdate: {
Action: 'PUT',
Value: {
N: '' + common.now()
}
}
}
};
// add the update reason if we have one
if (updateReason) {
updateBatchStatus.AttributeUpdates['updateReason'] = {
Action: 'PUT',
Value: {
S: updateReason
}
};
}
// add preconditions and correct operator if provided
if (requireStatusArray) {
updateBatchStatus.Expected = {
status: {
AttributeValueList: requireStatusArray,
ComparisonOperator: requireStatusArray.length > 1 ? 'IN' : 'EQ'
}
}
}
dynamoDB.updateItem(updateBatchStatus, function (err, data) {
if (err) {
callback(err);
} else {
callback();
}
});
};
exports.updateBatchStatus = updateBatchStatus;
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