cartodb/CartoDB-SQL-API
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Set Last-Modified header based on affected tables

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Closes #101
This commit is contained in:
Raul Ochoa 2015-09-02 16:25:56 +02:00
parent 1cad6aad02
commit f816093036
6 changed files with 181 additions and 36 deletions
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6
NEWS.md
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@ -1,6 +1,10 @@
1.24.1 - 2015-mm-dd
1.25.0 - 2015-mm-dd
-------------------
New features:
* Set `Last-Modified` header based on affected tables (#101)
1.24.0 - 2015-08-04
-------------------

74
app/controllers/app.js
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@ -365,26 +365,39 @@ function handleQuery(req, res) {
tableCacheItem.hits++;
return false;
} else {
//TODO: sanitize cdbuser
pg.query("SELECT CDB_QueryTables($quotesql$" + sql + "$quotesql$)", function (err, result) {
if (err) {
self(err);
return;
}
if ( result.rowCount === 1 ) {
var raw_tables = result.rows[0].cdb_querytables;
var tables = raw_tables.split(/^\{(.*)\}$/)[1].split(',');
self(null, tables);
} else {
console.error(
"Unexpected result from CDB_QueryTables($quotesql$" + sql + "$quotesql$): " + result
);
self(null, []);
}
});
var affectedTablesAndLastUpdatedTimeQuery = [
'WITH querytables AS (',
'SELECT * FROM CDB_QueryTablesText($quotesql$' + sql + '$quotesql$) as tablenames',
')',
'SELECT (SELECT tablenames FROM querytables), EXTRACT(EPOCH FROM max(updated_at)) as max',
'FROM CDB_TableMetadata m',
'WHERE m.tabname = any ((SELECT tablenames from querytables)::regclass[])'
].join(' ');
pg.query(affectedTablesAndLastUpdatedTimeQuery, function (err, resultSet) {
var tableNames = [];
var lastUpdatedTime = Date.now();
if (!err && resultSet.rowCount === 1) {
var result = resultSet.rows[0];
// This is an Array, so no need to split into parts
tableNames = result.tablenames;
if (Number.isFinite(result.max)) {
lastUpdatedTime = result.max * 1000;
}
} else {
var errorMessage = (err && err.message) || 'unknown error';
console.error("Error on query explain '%s': %s", sql, errorMessage);
}
return self(null, {
affectedTables: tableNames,
lastUpdatedTime: lastUpdatedTime
});
});
}
},
function setHeaders(err, tables){
function setHeaders(err, result) {
assert.ifError(err);
if ( req.profiler ) {
@ -394,13 +407,14 @@ function handleQuery(req, res) {
checkAborted('setHeaders');
// store explain result in local Cache
if ( ! tableCacheItem && tables.length ) {
if ( ! tableCacheItem && result && result.affectedTables ) {
tableCacheItem = {
affected_tables: tables,
// check if query may possibly write
may_write: queryMayWrite(sql),
// initialise hit counter
hits: 1
affected_tables: result.affectedTables,
last_modified: result.lastUpdatedTime,
// check if query may possibly write
may_write: queryMayWrite(sql),
// initialise hit counter
hits: 1
};
tableCache.set(sql_md5, tableCacheItem);
}
@ -449,14 +463,10 @@ function handleQuery(req, res) {
res.header('X-Cache-Channel', generateCacheKey(dbopts.dbname, tableCacheItem, authenticated));
}
// Set Last-Modified header
//
// Currently sets it to NOW
//
// TODO: use a real value, querying for most recent change in
// any of the source tables
//
res.header('Last-Modified', new Date().toUTCString());
var lastModified = (tableCacheItem && tableCacheItem.last_modified) ?
tableCacheItem.last_modified :
Date.now();
res.header('Last-Modified', new Date(lastModified).toUTCString());
return null;
},

5
npm-shrinkwrap.json generated
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@ -1,6 +1,6 @@
{
"name": "cartodb_sql_api",
"version": "1.24.1",
"version": "1.25.0",
"dependencies": {
"cartodb-psql": {
"version": "0.6.0",
@ -142,7 +142,8 @@
},
"inherits": {
"version": "2.0.1",
"from": "inherits@~2.0.1"
"from": "inherits@2",
"resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.1.tgz"
}
}
},

2
package.json
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@ -5,7 +5,7 @@
"keywords": [
"cartodb"
],
"version": "1.24.1",
"version": "1.25.0",
"repository": {
"type": "git",
"url": "git://github.com/CartoDB/CartoDB-SQL-API.git"

117
test/acceptance/last-modified-header.js Normal file
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@ -0,0 +1,117 @@
require('../helper');
var app = require(global.settings.app_root + '/app/controllers/app')();
var assert = require('../support/assert');
var qs = require('querystring');
describe('last modified header', function() {
var scenarios = [
{
tables: ['untitle_table_4'],
desc: 'should use last updated time from public table',
expectedLastModified: 'Wed, 01 Jan 2014 23:31:30 GMT'
},
{
tables: ['private_table'],
desc: 'should use last updated time from private table',
expectedLastModified: 'Thu, 01 Jan 2015 23:31:30 GMT'
},
{
tables: ['untitle_table_4', 'private_table'],
desc: 'should use most recent last updated time from private and public table',
expectedLastModified: 'Thu, 01 Jan 2015 23:31:30 GMT'
},
{
tables: ['populated_places_simple_reduced', 'private_table'],
desc: 'should use last updated time from table in cdb_tablemetadata instead of now() from unknown table',
expectedLastModified: 'Thu, 01 Jan 2015 23:31:30 GMT'
}
];
scenarios.forEach(function(scenario) {
it(scenario.desc, function(done) {
var query = qs.stringify({
q: scenario.tables.map(function(table) {
return 'select cartodb_id from ' + table;
}).join(' UNION ALL '),
api_key: 1234
});
assert.response(app,
{
url: '/api/v1/sql?' + query,
headers: {
host: 'vizzuality.cartodb.com'
},
method: 'GET'
},
{
statusCode: 200
},
function(res) {
assert.equal(res.headers['last-modified'], scenario.expectedLastModified);
done();
}
);
});
});
it('should use Date.now() for tables not present in cdb_tablemetadata', function(done) {
var query = qs.stringify({
q: 'select cartodb_id from populated_places_simple_reduced limit 1',
api_key: 1234
});
var fixedDateNow = Date.now();
var dateNowFn = Date.now;
Date.now = function() {
return fixedDateNow;
};
assert.response(app,
{
url: '/api/v1/sql?' + query,
headers: {
host: 'vizzuality.cartodb.com'
},
method: 'GET'
},
{
statusCode: 200
},
function(res) {
Date.now = dateNowFn;
assert.equal(res.headers['last-modified'], new Date(fixedDateNow).toUTCString());
done();
}
);
});
it('should use Date.now() for functions or results with no table associated', function(done) {
var query = qs.stringify({
q: 'select 1',
api_key: 1234
});
var fixedDateNow = Date.now();
var dateNowFn = Date.now;
Date.now = function() {
return fixedDateNow;
};
assert.response(app,
{
url: '/api/v1/sql?' + query,
headers: {
host: 'vizzuality.cartodb.com'
},
method: 'GET'
},
{
statusCode: 200
},
function(res) {
Date.now = dateNowFn;
assert.equal(res.headers['last-modified'], new Date(fixedDateNow).toUTCString());
done();
}
);
});
});

13
test/test.sql
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@ -137,3 +137,16 @@ DROP TABLE IF EXISTS cpg_test;
CREATE TABLE cpg_test (a int);
GRANT ALL ON TABLE cpg_test TO :TESTUSER;
GRANT SELECT ON TABLE cpg_test TO :PUBLICUSER;
CREATE TABLE IF NOT EXISTS
CDB_TableMetadata (
tabname regclass not null primary key,
updated_at timestamp with time zone not null default now()
);
INSERT INTO CDB_TableMetadata (tabname, updated_at) VALUES ('untitle_table_4'::regclass, '2014-01-01T23:31:30.123Z');
INSERT INTO CDB_TableMetadata (tabname, updated_at) VALUES ('private_table'::regclass, '2015-01-01T23:31:30.123Z');
GRANT SELECT ON CDB_TableMetadata TO :PUBLICUSER;
GRANT SELECT ON CDB_TableMetadata TO :TESTUSER;