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Rework and fix index paranoia feature #179

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161 changes: 125 additions & 36 deletions hacks/common.js
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Original file line number Diff line number Diff line change
Expand Up @@ -116,50 +116,139 @@ DBQuery.prototype.shellPrint = function(){
var paranoia = mongo_hacker_config.index_paranoia;

if (typeof paranoia !== 'undefined' && paranoia) {
var explain = this.clone();
explain._ensureSpecial();
explain._query.$explain = true;
explain._limit = Math.abs(n) * -1;
var result = explain.next();

if (current_version < 3) {
var type = result.cursor;

if (type !== undefined) {
var index_use = "Index[";
if (type == "BasicCursor") {
index_use += colorize( "none", { color: "red", bright: true });
var explanation = this.explain();
var cursor = explanation.cursor;
var clauses = explanation.clauses;
var queryPlanner = explanation.queryPlanner;

if (cursor !== undefined || clauses !== undefined) {
var index_use = "Index[";
var parseClause = function(clause) {
var indexInfo;
if (clause.cursor === "BasicCursor") {
indexInfo = colorize("none", {color: "red", bright: true});
} else {
index_use += colorize( result.cursor.substring(12), { color: "green", bright: true });
var indexName = clause.cursor === "IDCursor" ? "_id_" : clause.cursor.split(" ")[1];
indexInfo = colorize(indexName, {color: "green", bright: true});
if (clause.indexOnly) {
indexInfo += colorize("(covered)", {color: "green", bright: false});
}
}
index_use += "]";
output.push(index_use);
return indexInfo;
};
if (clauses) {
var clauseInfo = [];
var singleClauseInfo;
clauses.forEach(function(clause) {
singleClauseInfo = parseClause(clause);
if (clauseInfo.filter(function(info) { return info === singleClauseInfo; }).length === 0) {
clauseInfo.push(singleClauseInfo);
}
});
index_use += clauseInfo.join(', ');
} else {
index_use += parseClause(explanation);
}
} else {
var winningPlan = result.queryPlanner.winningPlan;
var winningInputStage = winningPlan.inputStage.inputStage;

if (winningPlan !== undefined) {
var index_use = "Index[";
if (winningPlan.inputStage.stage === "COLLSCAN" || (winningInputStage !== undefined && winningInputStage.stage !== "IXSCAN")) {
index_use += colorize( "none", { color: "red", bright: true });
} else {
var fullScan = false;
for (index in winningInputStage.keyPattern) {
if (winningInputStage.indexBounds[index][0] == "[MinKey, MaxKey]") {
fullScan = true;
index_use += "]";
output.push(index_use);
} else if (queryPlanner !== undefined) {
var collectionIndexes;
var getIndexNameByKey = (function(query) {
return function(key) {
if (!collectionIndexes) {
var nsParts = query._ns.split('.');
var dbName = nsParts[0];
var colName = nsParts[1];
collectionIndexes = db.getSisterDB(dbName)[colName].getIndexes();
}
return collectionIndexes.filter(function (index) {
return JSON.stringify(index.key) === JSON.stringify(key);
})[0].name;
}
})(this);
var traverseStageTree = function(currentStage, results) {
results = results || {
collscans: 0,
eof: false,
fetches: 0,
idhacks: 0,
indexes: [],
ixscans: 0
};
switch(currentStage.stage) {
case "EOF":
results.eof = true;
break;
case "COLLSCAN":
results.collscans++;
break;
case "IDHACK":
results.idhacks++;
break;
case "IXSCAN":
results.ixscans++;
var currentIndexName = currentStage.indexName;
if (!currentIndexName) {
currentIndexName = getIndexNameByKey(currentStage.keyPattern);
}
if (results.indexes.filter(function(indexName) { return indexName === currentIndexName; }).length === 0) {
results.indexes.push(currentIndexName);
}
break;
case "FETCH":
results.fetches++;
// Fallthrough.
default:
if (currentStage.inputStage) {
traverseStageTree(currentStage.inputStage, results);
} else if (currentStage.inputStages) {
for (var i = 0, length = currentStage.inputStages.length; i < length; i++) {
traverseStageTree(currentStage.inputStages[i], results);
}
}

if (fullScan) {
index_use += colorize( winningInputStage.indexName + " (full scan)", { color: "yellow", bright: true });
} else {
index_use += colorize( winningInputStage.indexName, { color: "green", bright: true });
}
return results;
};
var parseQueryResults = function(results) {
var indexInfo;
if (results.eof) {
indexInfo = colorize("collection doesn't exist", { color: "red", bright: true });
} else if (results.idhacks) {
indexInfo = colorize("_id_", { color: "green", bright: true });
} else if (results.ixscans) {
indexInfo = results.indexes.map(function(index) {
return colorize(index, { color: "green", bright: true });
}).join(', ');
if (!results.fetches) {
indexInfo += colorize(" (covered)", { color: "green", bright: false });
}
} else if (results.collscans) {
indexInfo = colorize("none", { color: "red", bright: true });
} else {
indexInfo = colorize( "CAN'T DETERMINE", { color: "red", bright: true });
}
index_use += "]";
output.push(index_use);
return indexInfo;
};

var index_use = "Index[";
if (queryPlanner.winningPlan.shards) {
var shards = queryPlanner.winningPlan.shards;
var shardIndexesInfo = [];
shards.forEach(function(shard) {
shardIndexesInfo.push(
"shard " +
colorize(shard.shardName, { color: "blue", bright: true }) +
": " +
parseQueryResults(traverseStageTree(shard.winningPlan))
);
});
index_use += shardIndexesInfo.join('; ');
} else {
index_use += parseQueryResults(traverseStageTree(queryPlanner.winningPlan));
}

index_use += "]";
output.push(index_use);
}
}

Expand Down