RUST-2190 Remove support for server 4.0 (#1461)

Author: abr-egn

.evergreen/config.yml

@@ -94,9 +94,9 @@ buildvariants:
       SSL: ssl
     tasks:
       # Ubuntu 22.04 does not support MongoDB versions below 6.0.
-      - name: .standalone !.4.0 !.4.2 !.4.4 !.5.0
-      - name: .replicaset !.4.0 !.4.2 !.4.4 !.5.0
-      - name: .sharded !.4.0 !.4.2 !.4.4 !.5.0
+      - name: .standalone !.4.2 !.4.4 !.5.0
+      - name: .replicaset !.4.2 !.4.4 !.5.0
+      - name: .sharded !.4.2 !.4.4 !.5.0
 
   - name: macos-14.00
     display_name: "MacOS 14.00"
@@ -200,8 +200,8 @@ buildvariants:
     tasks:
       # The Stable API was introduced in MongoDB version 5.0. Drivers Evergreen Tools only supports
       # setting REQUIRE_API_VERSION on standalones and sharded clusters.
-      - .standalone !.4.0 !.4.2 !.4.4
-      - .sharded !.4.0 !.4.2 !.4.4
+      - .standalone !.4.2 !.4.4
+      - .sharded !.4.2 !.4.4
 
   - name: sync-api
     display_name: "Sync API"

.evergreen/generate-tasks/.gitignore

@@ -1 +1,2 @@
 target
+Cargo.lock

.evergreen/generate-tasks/src/main.rs

@@ -1,6 +1,4 @@
-static VERSIONS: &[&str] = &[
-    "4.0", "4.2", "4.4", "5.0", "6.0", "7.0", "8.0", "rapid", "latest",
-];
+static VERSIONS: &[&str] = &["4.2", "4.4", "5.0", "6.0", "7.0", "8.0", "rapid", "latest"];
 
 static TOPOLOGIES: &[(&str, &str)] = &[
     ("standalone", "server"),

.evergreen/suite-tasks.yml

@@ -3,15 +3,6 @@
 
 tasks:
 
-  - name: test-4.0-standalone
-    tags: [4.0, standalone]
-    commands:
-      - func: "bootstrap mongo-orchestration"
-        vars:
-          MONGODB_VERSION: 4.0
-          TOPOLOGY: server
-      - func: "run driver test suite"
-
   - name: test-4.2-standalone
     tags: [4.2, standalone]
     commands:
@@ -84,15 +75,6 @@ tasks:
           TOPOLOGY: server
       - func: "run driver test suite"
 
-  - name: test-4.0-replicaset
-    tags: [4.0, replicaset]
-    commands:
-      - func: "bootstrap mongo-orchestration"
-        vars:
-          MONGODB_VERSION: 4.0
-          TOPOLOGY: replica_set
-      - func: "run driver test suite"
-
   - name: test-4.2-replicaset
     tags: [4.2, replicaset]
     commands:
@@ -165,15 +147,6 @@ tasks:
           TOPOLOGY: replica_set
       - func: "run driver test suite"
 
-  - name: test-4.0-sharded
-    tags: [4.0, sharded]
-    commands:
-      - func: "bootstrap mongo-orchestration"
-        vars:
-          MONGODB_VERSION: 4.0
-          TOPOLOGY: sharded_cluster
-      - func: "run driver test suite"
-
   - name: test-4.2-sharded
     tags: [4.2, sharded]
     commands:

README.md

@@ -11,7 +11,7 @@ For more details, including features, runnable examples, troubleshooting resourc
 ### Requirements
 
 - Rust 1.83.0+ (See the [MSRV policy](#minimum-supported-rust-version-msrv-policy) for more information)
-- MongoDB 4.0+
+- MongoDB 4.2+
 
 #### Supported Platforms
 

src/action/find_and_modify.rs

@@ -61,8 +61,7 @@ impl<T: DeserializeOwned + Send + Sync> Collection<T> {
 
     /// Atomically finds up to one document in the collection matching `filter` and updates it.
     /// Both `Document` and `Vec<Document>` implement `Into<UpdateModifications>`, so either can be
-    /// passed in place of constructing the enum case. Note: pipeline updates are only supported
-    /// in MongoDB 4.2+.
+    /// passed in place of constructing the enum case.
     ///
     /// This operation will retry once upon failure if the connection and encountered error support
     /// retryability. See the documentation
@@ -133,8 +132,7 @@ impl<T: DeserializeOwned + Send + Sync> crate::sync::Collection<T> {
 
     /// Atomically finds up to one document in the collection matching `filter` and updates it.
     /// Both `Document` and `Vec<Document>` implement `Into<UpdateModifications>`, so either can be
-    /// passed in place of constructing the enum case. Note: pipeline updates are only supported
-    /// in MongoDB 4.2+.
+    /// passed in place of constructing the enum case.
     ///
     /// This operation will retry once upon failure if the connection and encountered error support
     /// retryability. See the documentation

src/action/transaction.rs

@@ -19,9 +19,6 @@ impl ClientSession {
     /// [`crate::error::TRANSIENT_TRANSACTION_ERROR`] label. This label indicates that the entire
     /// transaction can be retried with a reasonable expectation that it will succeed.
     ///
-    /// Transactions on replica sets are supported on MongoDB 4.0+. Transactions on sharded
-    /// clusters are supported on MongoDB 4.2+.
-    ///
     /// ```rust
     /// # use mongodb::{bson::{doc, Document}, error::Result, Client, ClientSession};
     /// #

src/action/update.rs

@@ -20,8 +20,7 @@ where
     /// Updates all documents matching `query` in the collection.
     ///
     /// Both `Document` and `Vec<Document>` implement `Into<UpdateModifications>`, so either can be
-    /// passed in place of constructing the enum case. Note: pipeline updates are only supported
-    /// in MongoDB 4.2+. See the official MongoDB
+    /// passed in place of constructing the enum case. See the official MongoDB
     /// [documentation](https://www.mongodb.com/docs/manual/reference/command/update/#behavior) for more information on specifying updates.
     ///
     /// `await` will return d[`Result<UpdateResult>`].
@@ -41,8 +40,7 @@ where
     /// Updates up to one document matching `query` in the collection.
     ///
     /// Both `Document` and `Vec<Document>` implement `Into<UpdateModifications>`, so either can be
-    /// passed in place of constructing the enum case. Note: pipeline updates are only supported
-    /// in MongoDB 4.2+. See the official MongoDB
+    /// passed in place of constructing the enum case. See the official MongoDB
     /// [documentation](https://www.mongodb.com/docs/manual/reference/command/update/#behavior) for more information on specifying updates.
     ///
     /// This operation will retry once upon failure if the connection and encountered error support
@@ -73,8 +71,7 @@ where
     /// Updates all documents matching `query` in the collection.
     ///
     /// Both `Document` and `Vec<Document>` implement `Into<UpdateModifications>`, so either can be
-    /// passed in place of constructing the enum case. Note: pipeline updates are only supported
-    /// in MongoDB 4.2+. See the official MongoDB
+    /// passed in place of constructing the enum case. See the official MongoDB
     /// [documentation](https://www.mongodb.com/docs/manual/reference/command/update/#behavior) for more information on specifying updates.
     ///
     /// [`run`](Update::run) will return d[`Result<UpdateResult>`].
@@ -87,8 +84,7 @@ where
     /// Updates up to one document matching `query` in the collection.
     ///
     /// Both `Document` and `Vec<Document>` implement `Into<UpdateModifications>`, so either can be
-    /// passed in place of constructing the enum case. Note: pipeline updates are only supported
-    /// in MongoDB 4.2+. See the official MongoDB
+    /// passed in place of constructing the enum case. See the official MongoDB
     /// [documentation](https://www.mongodb.com/docs/manual/reference/command/update/#behavior) for more information on specifying updates.
     ///
     /// This operation will retry once upon failure if the connection and encountered error support

src/action/watch.rs

@@ -33,8 +33,7 @@ use crate::{
 impl Client {
     /// Starts a new [`ChangeStream`] that receives events for all changes in the cluster. The
     /// stream does not observe changes from system collections or the "config", "local" or
-    /// "admin" databases. Note that this method (`watch` on a cluster) is only supported in
-    /// MongoDB 4.0 or greater.
+    /// "admin" databases.
     ///
     /// See the documentation [here](https://www.mongodb.com/docs/manual/changeStreams/) on change
     /// streams.
@@ -121,8 +120,7 @@ where
 impl crate::sync::Client {
     /// Starts a new [`ChangeStream`] that receives events for all changes in the cluster. The
     /// stream does not observe changes from system collections or the "config", "local" or
-    /// "admin" databases. Note that this method (`watch` on a cluster) is only supported in
-    /// MongoDB 4.0 or greater.
+    /// "admin" databases.
     ///
     /// See the documentation [here](https://www.mongodb.com/docs/manual/changeStreams/) on change
     /// streams.

src/change_stream/options.rs

@@ -51,8 +51,6 @@ pub struct ChangeStreamOptions {
     /// the token. This will allow users to watch collections that have been dropped and
     /// recreated or newly renamed collections without missing any notifications.
     ///
-    /// This feature is only available on MongoDB 4.2+.
-    ///
     /// See the documentation [here](https://www.mongodb.com/docs/master/changeStreams/#change-stream-start-after) for more
     /// information.
     pub start_after: Option<ResumeToken>,