Support idle_in_transaction_session_timeout and statement_timeout for native driver

Right now when using `pg` with `pg-native` the config options
`idle_in_transaction_session_timeout` and `statement_timeout`
do not get applied. This is due to, when building the connection
string for native driver these options aren't passed in.

I took advantage of `options` conn parameter and passed both the config options
into it using `-c` which postgres supports. This builds on top of the work happened in <TBD LINK>.

Also added some tests. Very much open to feedback and comments :).

Author: Shayon Mukherjee

packages/pg/lib/connection-parameters.js

@@ -45,6 +45,21 @@ var add = function (params, config, paramName) {
   }
 }
 
+var escapeOptionValue = function (value) {
+  return ('' + value).replace(/\\/g, '\\\\').replace(/ /g, '\\ ')
+}
+
+var addOption = function (options, config, optionName) {
+  if (!config[optionName]) {
+    return
+  }
+
+  var value = config[optionName]
+  if (value !== undefined && value !== null) {
+    options.push('-c ' + optionName + '=' + escapeOptionValue(value))
+  }
+}
+
 class ConnectionParameters {
   constructor(config) {
     // if a string is passed, it is a raw connection string so we parse it into a config
@@ -120,6 +135,8 @@ class ConnectionParameters {
 
   getLibpqConnectionString(cb) {
     var params = []
+    var pgOptions = []
+
     add(params, this, 'user')
     add(params, this, 'password')
     add(params, this, 'port')
@@ -128,6 +145,16 @@ class ConnectionParameters {
     add(params, this, 'connect_timeout')
     add(params, this, 'options')
 
+    addOption(pgOptions, this, 'statement_timeout')
+    addOption(pgOptions, this, 'idle_in_transaction_session_timeout')
+
+    if (this.options) {
+      pgOptions.push(this.options)
+    }
+    if (pgOptions.length > 0) {
+      params.push('options=' + quoteParamValue(pgOptions.join(' ')))
+    }
+
     var ssl = typeof this.ssl === 'object' ? this.ssl : this.ssl ? { sslmode: this.ssl } : {}
     add(params, ssl, 'sslmode')
     add(params, ssl, 'sslca')

packages/pg/test/unit/connection-parameters/creation-tests.js

@@ -172,6 +172,26 @@ test('libpq connection string building', function () {
     )
   })
 
+  test('builds conn string with options', function () {
+    var config = {
+      user: 'brian',
+      password: 'xyz',
+      port: 888,
+      host: 'localhost',
+      database: 'bam',
+      statement_timeout: 5000,
+      idle_in_transaction_session_timeout: 5000,
+    }
+    var subject = new ConnectionParameters(config)
+    subject.getLibpqConnectionString(
+      assert.calls(function (err, constring) {
+        assert(!err)
+        var parts = constring.split(/ (?=([^\']*\'[^\']*\')*[^\']*$)/)
+        checkForPart(parts, "options='-c statement_timeout=5000 -c idle_in_transaction_session_timeout=5000'")
+      })
+    )
+  })
+
   test('builds dns string', function () {
     var config = {
       user: 'brian',