Correct error handling in establishing SSL/TLS connection (Issue #17).

Author: pitfield

Docs/API/Enums/PostgresError.html

@@ -301,6 +301,33 @@ <h4>Declaration</h4>
                       </section>
                     </div>
                   </li>
+                  <li class="item">
+                    <div>
+                      <code>
+                      <a name="/s:17PostgresClientKit0A5ErrorO03sslD0yACs0D0_p_tcACmF"></a>
+                      <a name="//apple_ref/swift/Element/sslError(cause:)" class="dashAnchor"></a>
+                      <a class="token" href="#/s:17PostgresClientKit0A5ErrorO03sslD0yACs0D0_p_tcACmF">sslError(cause:)</a>
+                      </code>
+                    </div>
+                    <div class="height-container">
+                      <div class="pointer-container"></div>
+                      <section class="section">
+                        <div class="pointer"></div>
+                        <div class="abstract">
+                          <p>An error occurred in establishing SSL/TLS encryption.</p>
+
+                        </div>
+                        <div class="declaration">
+                          <h4>Declaration</h4>
+                          <div class="language">
+                            <p class="aside-title">Swift</p>
+                            <pre class="highlight swift"><code><span class="k">case</span> <span class="nf">sslError</span><span class="p">(</span><span class="nv">cause</span><span class="p">:</span> <span class="kt">Error</span><span class="p">)</span></code></pre>
+
+                          </div>
+                        </div>
+                      </section>
+                    </div>
+                  </li>
                   <li class="item">
                     <div>
                       <code>

Sources/PostgresClientKit/Connection.swift

@@ -135,11 +135,16 @@ public class Connection: CustomStringConvertible {
                 throw PostgresError.sslNotSupported
             }
 
-            let sslConfig = configuration.sslServiceConfiguration
-            let sslService = try SSLService(usingConfiguration: sslConfig)!
-            socket.delegate = sslService
-            try sslService.initialize(asServer: false)
-            try sslService.onConnect(socket: socket)
+            do {
+                let sslConfig = configuration.sslServiceConfiguration
+                let sslService = try SSLService(usingConfiguration: sslConfig)!
+                socket.delegate = sslService
+                try sslService.initialize(asServer: false)
+                try sslService.onConnect(socket: socket)
+            } catch {
+                log(.severe, "Unable to establish SSL/TLS encryption: \(error)")
+                throw PostgresError.sslError(cause: error)
+            }
 
             log(.fine, "Successfully negotiated SSL/TLS encryption")
         }

Sources/PostgresClientKit/PostgresError.swift

@@ -47,6 +47,9 @@ public enum PostgresError: Error {
     /// The Postgres server reported a SQL error.
     case sqlError(notice: Notice)
 
+    /// An error occurred in establishing SSL/TLS encryption.
+    case sslError(cause: Error)
+    
     /// The Postgres server does not support SSL/TLS.
     case sslNotSupported