Add IP address preference support for TCP connection #1015

karinazhou · 2021-03-31T23:17:51Z

A new connection property IPAddressPreference is added to specify the IP preference by the client application when doing TCP connection. There are three valid types:

IPv4First
This is the default preference. The driver will traverse IPv4 addresses first. If none of them can be connected successfully, it continues to try IPv6 addresses if there are any.
IPv6First
The driver will traverse IPv6 addresses first. If none of them can be connected successfully, it continues to try IPv4 addresses if there are any.
UsePlatformDefault
The driver will traverse all the IP addresses in their initial orders from DNS resolution.

To keep the consistency between managed SNI and native SNI, the connection logic is changed in SNITcpHandle:Connect(). Instead of keeping the last IPv4 and IPv6 addresses, all the valid IP addresses returned from DNS resolution will be tested in a row. There will be a separate PR containing this change in parallel.

NOTE: This PR requires the change in native SNI so it requires a new version of Microsoft.Data.SqlClient.SNI to be released first.

cc @johnnypham @cheenamalhotra @David-Engel @saurabh500

…ressPreference

src/Microsoft.Data.SqlClient/netcore/src/Interop/SNINativeMethodWrapper.Windows.cs

doc/snippets/Microsoft.Data.SqlClient/SqlConnectionIPAddressPreference.xml

doc/snippets/Microsoft.Data.SqlClient/SqlConnectionStringBuilder.xml

src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/SNI/SNITcpHandle.cs

doc/snippets/Microsoft.Data.SqlClient/SqlConnectionIPAddressPreference.xml

doc/snippets/Microsoft.Data.SqlClient/SqlConnectionStringBuilder.xml

Wraith2 · 2021-04-02T16:44:08Z

I had a talk to someone with some networking experience and they pointed out that many applications will use addresses in the order returned from dns to connect to resources and so the first ip address in a list is likely to be the most connected route. This means that seemingly arbitrary choice of the last ip of each type may have been a deliberate attempt to choose the least used route. If this is true then that should have been called out in the code with a comment.

I think trying each address returned in the order that they are returned will be more compatible with dns based load balancing schemes. When you look at parallelizing the connections you may want to keep track of the original ordering and when two connections succeed choose the first using the original ordering.

Co-authored-by: David Engel <[email protected]>

…qlClient into IPAddressPreference

src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/SNI/SNITcpHandle.cs

…ent/SNI/SNITcpHandle.cs

# Conflicts: # src/Microsoft.Data.SqlClient/tests/ManualTests/Microsoft.Data.SqlClient.ManualTesting.Tests.csproj

BUILDGUIDE.md

This reverts commit 5642e74.

src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/Common/DbConnectionStringCommon.cs

src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/SNI/SNITcpHandle.cs

src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/Common/DbConnectionStringCommon.cs

src/Microsoft.Data.SqlClient/netcore/src/Resources/Strings.Designer.cs

src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/SqlClient/SqlConnection.cs

src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/SqlConnection.cs

Co-authored-by: Javad <[email protected]> Co-authored-by: Cheena Malhotra <[email protected]>

src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/Common/DbConnectionStringCommon.cs

src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/SNI/SNITcpHandle.cs

src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/SqlConnectionString.cs

src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/SqlConnectionStringBuilder.cs

+ improvement

Co-authored-by: Cheena Malhotra <[email protected]>

Wraith2 · 2021-05-11T23:47:25Z

src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/Common/DbConnectionStringCommon.cs

+            string sValue = (value as string);
+            if (sValue is not null)


Can this be if (value is string sValue) ? the is operator does the type and null checks so it's known to be a non-null string inside the if block if the condition returns true.

src/Microsoft.Data.SqlClient/netcore/src/Resources/Strings.Designer.cs

src/Microsoft.Data.SqlClient/netfx/src/Resources/Strings.Designer.cs

+ modify CancelAsyncConnections test

doc/snippets/Microsoft.Data.SqlClient/SqlConnectionIPAddressPreference.xml

…eference.xml Co-authored-by: Cheena Malhotra <[email protected]>

+ Disable TNIR in connection string

karinazhou added 5 commits March 23, 2021 18:01

Add IPAddressPreference net core

612f259

Merge branch 'main' of https://github.com/dotnet/SqlClient into IPAdd…

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…ressPreference

netcore SynonymCount update

b5c42ff

Add keyword in netfx

5ca9b4a

Add IP preference logic

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karinazhou commented Mar 31, 2021

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Fix incorrect description

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David-Engel reviewed Apr 1, 2021

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karinazhou and others added 3 commits April 7, 2021 19:24

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Co-authored-by: David Engel <[email protected]>

Update DNS cache descripption

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Merge branch 'IPAddressPreference' of https://github.com/karinazhou/S…

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…qlClient into IPAddressPreference

cheenamalhotra added the 🆕 Public API Issues/PRs that introduce new APIs to the driver. label Apr 9, 2021

cheenamalhotra added this to the 3.0.0-preview3 milestone Apr 9, 2021

johnnypham added 3 commits April 15, 2021 17:42

Merge remote-tracking branch 'upstream/main' into pr/1015

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tests for ip address preference

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Update SNITcpHandle.cs

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Wraith2 reviewed Apr 19, 2021

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Update ConfigurableIpPreferenceTest.cs

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johnnypham and others added 4 commits April 23, 2021 12:47

Update src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlCli…

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…ent/SNI/SNITcpHandle.cs

Improvement

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Merge remote-tracking branch 'UpStream/main' into IPAddressPreference

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# Conflicts: # src/Microsoft.Data.SqlClient/tests/ManualTests/Microsoft.Data.SqlClient.ManualTesting.Tests.csproj

Add new configurations

5642e74

DavoudEshtehari reviewed Apr 30, 2021

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Davoud Eshtehari added 2 commits April 30, 2021 15:45

Revert "Add new configurations"

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This reverts commit 5642e74.

Update default config

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DavoudEshtehari force-pushed the IPAddressPreference branch from fd6c475 to fb778fc Compare May 6, 2021 22:31

Add test

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DavoudEshtehari changed the title ~~WIP | Add IP address preference support for TCP connection~~ Add IP address preference support for TCP connection May 10, 2021

JRahnama reviewed May 11, 2021

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DavoudEshtehari mentioned this pull request May 11, 2021

Fix | SqlClient-826 Missed synchronization #1029

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Davoud Eshtehari and others added 2 commits May 11, 2021 10:36

Merge remote-tracking branch 'UpStream/main' into IPAddressPreference

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Apply suggestions from code review

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Co-authored-by: Javad <[email protected]> Co-authored-by: Cheena Malhotra <[email protected]>

Wraith2 reviewed May 11, 2021

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DavoudEshtehari force-pushed the IPAddressPreference branch from 7939ea3 to c41b411 Compare May 11, 2021 23:34

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+ improvement

DavoudEshtehari force-pushed the IPAddressPreference branch from c41b411 to c71143c Compare May 11, 2021 23:42

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Co-authored-by: Cheena Malhotra <[email protected]>

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+ modify CancelAsyncConnections test

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Update doc/snippets/Microsoft.Data.SqlClient/SqlConnectionIPAddressPr…

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…eference.xml Co-authored-by: Cheena Malhotra <[email protected]>

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+ Disable TNIR in connection string

DavoudEshtehari force-pushed the IPAddressPreference branch from 5e5f4ce to 019fce0 Compare May 14, 2021 23:24

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cheenamalhotra merged commit 561b535 into dotnet:main May 17, 2021

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Add IP address preference support for TCP connection #1015

Add IP address preference support for TCP connection #1015

karinazhou commented Mar 31, 2021 •

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Wraith2 commented Apr 2, 2021

Wraith2 May 11, 2021

Add IP address preference support for TCP connection #1015

Add IP address preference support for TCP connection #1015

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