DRIVERS-720 Add load balancer support spec tests (#934)

Author: Divjot Arora

source/initial-dns-seedlist-discovery/tests/README.rst

@@ -0,0 +1,7 @@
+{
+  "uri": "mongodb+srv://test20.test.build.10gen.cc/?directConnection=false",
+  "seeds": [],
+  "hosts": [],
+  "error": true,
+  "comment": "Should fail because loadBalanced=true is incompatible with directConnection"
+}

source/initial-dns-seedlist-discovery/tests/load-balanced/loadBalanced-directConnection-errors.json

@@ -0,0 +1,7 @@
+# The TXT record for test20.test.build.10gen.cc contains loadBalanced=true. There is no corresponding test for
+# directConnection=true because that option is already incompatible with SRV URIs.
+uri: "mongodb+srv://test20.test.build.10gen.cc/?directConnection=false"
+seeds: []
+hosts: []
+error: true
+comment: Should fail because loadBalanced=true is incompatible with directConnection

source/initial-dns-seedlist-discovery/tests/load-balanced/loadBalanced-directConnection-errors.yml

@@ -0,0 +1,7 @@
+{
+  "uri": "mongodb+srv://test20.test.build.10gen.cc/?replicaSet=replset",
+  "seeds": [],
+  "hosts": [],
+  "error": true,
+  "comment": "Should fail because loadBalanced=true is incompatible with replicaSet"
+}

source/initial-dns-seedlist-discovery/tests/load-balanced/loadBalanced-replicaSet-errors.json

@@ -0,0 +1,6 @@
+# The TXT record for test20.test.build.10gen.cc contains loadBalanced=true.
+uri: "mongodb+srv://test20.test.build.10gen.cc/?replicaSet=replset"
+seeds: []
+hosts: []
+error: true
+comment: Should fail because loadBalanced=true is incompatible with replicaSet

source/initial-dns-seedlist-discovery/tests/load-balanced/loadBalanced-replicaSet-errors.yml

@@ -0,0 +1,7 @@
+{
+  "uri": "mongodb+srv://test1.test.build.10gen.cc/?loadBalanced=true",
+  "seeds": [],
+  "hosts": [],
+  "error": true,
+  "comment": "Should fail because loadBalanced is true but the SRV record resolves to multiple hosts"
+}

source/initial-dns-seedlist-discovery/tests/load-balanced/loadBalanced-true-multiple-hosts.json

@@ -0,0 +1,5 @@
+uri: "mongodb+srv://test1.test.build.10gen.cc/?loadBalanced=true"
+seeds: []
+hosts: []
+error: true
+comment: Should fail because loadBalanced is true but the SRV record resolves to multiple hosts

source/initial-dns-seedlist-discovery/tests/load-balanced/loadBalanced-true-multiple-hosts.yml

@@ -0,0 +1,13 @@
+{
+  "uri": "mongodb+srv://test20.test.build.10gen.cc/",
+  "seeds": [
+    "localhost.test.build.10gen.cc:27017"
+  ],
+  "hosts": [
+    "localhost.test.build.10gen.cc:27017"
+  ],
+  "options": {
+    "loadBalanced": true,
+    "ssl": true
+  }
+}

source/initial-dns-seedlist-discovery/tests/load-balanced/loadBalanced-true-txt.json

@@ -0,0 +1,10 @@
+uri: "mongodb+srv://test20.test.build.10gen.cc/"
+seeds:
+    - localhost.test.build.10gen.cc:27017
+hosts:
+    # In LB mode, the driver does not do server discovery, so the hostname does
+    # not get resolved to localhost:27017.
+    - localhost.test.build.10gen.cc:27017
+options:
+    loadBalanced: true
+    ssl: true

source/initial-dns-seedlist-discovery/tests/load-balanced/loadBalanced-true-txt.yml

@@ -0,0 +1,15 @@
+{
+  "uri": "mongodb+srv://test21.test.build.10gen.cc/",
+  "seeds": [
+    "localhost.test.build.10gen.cc:27017"
+  ],
+  "hosts": [
+    "localhost:27017",
+    "localhost:27018",
+    "localhost:27019"
+  ],
+  "options": {
+    "loadBalanced": false,
+    "ssl": true
+  }
+}

source/initial-dns-seedlist-discovery/tests/direct-connection-false.json renamed to source/initial-dns-seedlist-discovery/tests/replica-set/direct-connection-false.json

@@ -0,0 +1,10 @@
+uri: "mongodb+srv://test21.test.build.10gen.cc/"
+seeds:
+    - localhost.test.build.10gen.cc:27017
+hosts:
+    - localhost:27017
+    - localhost:27018
+    - localhost:27019
+options:
+    loadBalanced: false
+    ssl: true

source/initial-dns-seedlist-discovery/tests/direct-connection-false.yml renamed to source/initial-dns-seedlist-discovery/tests/replica-set/direct-connection-false.yml

@@ -0,0 +1,28 @@
+{
+  "description": "Load balancer can be discovered and only has the address property set",
+  "uri": "mongodb://a/?loadBalanced=true",
+  "phases": [
+    {
+      "outcome": {
+        "servers": {
+          "a:27017": {
+            "type": "LoadBalancer",
+            "setName": null,
+            "setVersion": null,
+            "electionId": null,
+            "logicalSessionTimeoutMinutes": null,
+            "minWireVersion": null,
+            "maxWireVersion": null,
+            "topologyVersion": null
+          }
+        },
+        "topologyType": "LoadBalanced",
+        "setName": null,
+        "logicalSessionTimeoutMinutes": null,
+        "maxSetVersion": null,
+        "maxElectionId": null,
+        "compatible": true
+      }
+    }
+  ]
+}

source/initial-dns-seedlist-discovery/tests/direct-connection-true.json renamed to source/initial-dns-seedlist-discovery/tests/replica-set/direct-connection-true.json

@@ -0,0 +1,25 @@
+description: "Load balancer can be discovered and only has the address property set"
+
+uri: "mongodb://a/?loadBalanced=true"
+
+phases:
+
+  # There should be no monitoring in LoadBalanced mode, so no responses are necessary to get the topology into the
+  # correct state.
+  - outcome:
+      servers:
+        a:27017:
+          type: LoadBalancer
+          setName: null
+          setVersion: null
+          electionId: null
+          logicalSessionTimeoutMinutes: null
+          minWireVersion: null
+          maxWireVersion: null
+          topologyVersion: null
+      topologyType: LoadBalanced
+      setName: null
+      logicalSessionTimeoutMinutes: null
+      maxSetVersion: null
+      maxElectionId: null
+      compatible: true

source/initial-dns-seedlist-discovery/tests/direct-connection-true.yml renamed to source/initial-dns-seedlist-discovery/tests/replica-set/direct-connection-true.yml

@@ -0,0 +1,93 @@
+{
+  "description": "Monitoring a load balancer",
+  "uri": "mongodb://a:27017/?loadBalanced=true",
+  "phases": [
+    {
+      "outcome": {
+        "events": [
+          {
+            "topology_opening_event": {
+              "topologyId": "42"
+            }
+          },
+          {
+            "topology_description_changed_event": {
+              "topologyId": "42",
+              "previousDescription": {
+                "topologyType": "Unknown",
+                "servers": []
+              },
+              "newDescription": {
+                "topologyType": "LoadBalanced",
+                "servers": [
+                  {
+                    "address": "a:27017",
+                    "arbiters": [],
+                    "hosts": [],
+                    "passives": [],
+                    "type": "Unknown"
+                  }
+                ]
+              }
+            }
+          },
+          {
+            "server_opening_event": {
+              "topologyId": "42",
+              "address": "a:27017"
+            }
+          },
+          {
+            "server_description_changed_event": {
+              "topologyId": "42",
+              "address": "a:27017",
+              "previousDescription": {
+                "address": "a:27017",
+                "arbiters": [],
+                "hosts": [],
+                "passives": [],
+                "type": "Unknown"
+              },
+              "newDescription": {
+                "address": "a:27017",
+                "arbiters": [],
+                "hosts": [],
+                "passives": [],
+                "type": "LoadBalancer"
+              }
+            }
+          },
+          {
+            "topology_description_changed_event": {
+              "topologyId": "42",
+              "previousDescription": {
+                "topologyType": "LoadBalanced",
+                "servers": [
+                  {
+                    "address": "a:27017",
+                    "arbiters": [],
+                    "hosts": [],
+                    "passives": [],
+                    "type": "Unknown"
+                  }
+                ]
+              },
+              "newDescription": {
+                "topologyType": "LoadBalanced",
+                "servers": [
+                  {
+                    "address": "a:27017",
+                    "arbiters": [],
+                    "hosts": [],
+                    "passives": [],
+                    "type": "LoadBalancer"
+                  }
+                ]
+              }
+            }
+          }
+        ]
+      }
+    }
+  ]
+}