• Use util.promisify instead of fs/promises for Node 12 compatibility (#2838)

• Port bugfixes from 1.11.x into 1.12.x (#2836)

Changelog

• Provide the method_name for the CallCredentials callback generateMetadata (#2814 contributed by @becoded)
• Add an optional rejectUnauthorized field to the VerifyOptions interface, which can be passed as an argument to credentials.createSsl and createFromSecureContext (#2812 contributed by @vinothsa4891)

Experimental API changes

Added:

• CaCertificateUpdate
• CaCertificateUpdateListener
• IdentityCertificateUpdate
• IdentityCertificateUpdateListener
• CertificateProvider
• FileWatcherCertificateProvider
• FileWatcherCertificateProviderConfig
• createCertificateProviderChannelCredentials
• createCertificateProviderServerCredentials

Modified:

• LoadBalancer: The constructor now takes an additional argument of type ChannelCredentials.
• ChannelControlHelper#createSubchannel: Now takes an additional argument of type ChannelCredentials | null. This should be passed along if overriding this function.
• LeafLoadBalancer: The constructor now takes an additional argument of type ChannelCredentials.

• Enable dualstack socket support by default in xDS clients (#2832)

• Ensure the client queries the name resolver again after connections drop while using the round_robin load balancing policy (#2825)

• Fix client crash on receiving a custom error code (#2801 contributed by @hastom)
• Report connection errors more consistently (#2808)
• Avoid computing the channel constructor trace log when that tracer is not enabled (#2817 contributed by @ygalbel)

• Revert a change that used APIs that were not available in early minor versions of Node 14 (#2799 contributed by @xqin)

Changelog

• Add Server connection injection API as described in gRFC L114 (#2675)
• Implement support for an alternate DNS resolver that supports custom authorities (#2776 contributed by @gkampitakis)
• Add a channel option to configure retry attempt limits (#2795)
• Add a getHost method to server call objects (#2783, #2793)
• Fix typos and omissions in service config validation errors (#2782 contributed by @matthewbinshtok)

Experimental API changes

Added:

• splitHostPort
• HostPort
• createServerCredentialsWithInterceptors

• Add xDS Servers (#2783)
  • Note: this is primarily a foundation for future features. It doesn't actually do much right now.
• Add support for dualstack socket support in xDS clients (#2665)

• Fix a bug that caused clients to reconnect unnecessarily while no requests are pending. (#2784)
• Fix a bug that caused clients to fail to re-establish existing connections while waiting for DNS results (#2784)
• Fix a bug that caused servers to sometimes not close idle connections depending on timing (#2790)
• Fix a bug that caused calls to be pending indefinitely while unable to start after a channel is closed (#2791)