Changelog

This release contains some breaking changes. See the "Changed" section below.

Changed

• Build
  • Disable NATS Streaming by default by @mtmk in #770
  • TLS
    • Require OpenSSL 1.1.1+ to compile. Removed the NATS_BUILD_TLS_USE_OPENSSL_1_1_API CMake variable by @kozlovic in #905
    • The option natsOptions_SetSSLVerificationCallback signature was changed to replace the use of SSL_verify_cb (which required OpenSSL dependency in the nats.h file), to the new callback natsSSLVerifyCb. See documentation of natsSSLVerifyCb to see the cast needed to compile with this new header file by @kozlovic in #908
• Modification of a natsOptions object if it has TLS/SSL configuration and is actively used by connections will now return a NATS_ILLEGAL_STATE by @kozlovic in #912

Added

• Options
  • Ability to load the trusted CA certificates from a directory using the new option natsOptions_LoadCATrustedCertificatesPath by @kerbert101 in #862
  • Ability to connect via HTTP proxy for instance by adding a proxy connection handler using the new option natsOptions_SetProxyConnHandler by @wolfkor in #871 and @kozlovic in #897
  • Ability to load the certificate chain and key from a file on every connection attempt using the new option natsOptions_LoadCertificatesChainDynamic by @Matus-p in #901
  • Ability to perform concurrent TLS handshakes that may improve time it takes for concurrent connections to be established using the new option natsOptions_AllowConcurrentTLSHandshakes by @kozlovic in #914. Issue was reported by @yanyongcheng in #899
• JetStream
  • Per-message TTL support (a NATS Server v2.11 feature) by @levb in #863
  • Pull consumer priority groups (a NATS Server v2.11 feature) by @levb in #869
• ObjectStore support by @kozlovic in #902. Thanks to @jfflynn41 and @alex1891 for the feedback in #876

Improved

• JetStream
  • Handling of publish asynchronous timeouts by @kozlovic in #886. Issue reported by @yanyongcheng in #880
• Timer insertion by @kozlovic in #883. Issue reported by @yanyongcheng in #881

Fixed

• EventLoop:
  • Handling of possible failure on initial attach by @kozlovic in #918
  • LibEvent: natsConnection_Close() not closing the TCP connection by @kozlovic in #882. Issue was reported by @yanyongcheng in #879
  • Libuv: Possible crash if connection is destroyed while receiving data by @kozlovic in #889. Issue was reported by @yanyongcheng in #888
• KeyValue
  • Keys, History or watcher's next may incorrectly return NATS_TIMEOUT by @kozlovic in #917/ Issue was reported by @ArashPartow in #916
• MicroServices:
  • Wrong marshaling of average_processing_time by @kozlovic in #892. Issue was reported by @Archie3d in #890
  • Statistics error was always incremented by @kozlovic in #894. Issue was reported by @Archie3d in #893
• TLS
  • Unknown type name SSL_verify_cb by @kozlovic in #878. Issue was reported by @philipfoulkes in #877
  • Initialization and cleanup code related to OpenSSL was removed since it was deprecated for versions post OpenSSL 1.1. A cleanup function pertinent to 1.1+ code was possibly causing a problem. By @kozlovic in #905. Issue was reported by @vdeters in #904
  • Possible hang during handshake by @kozlovic in #907. Issue was reported by @etrochim in #906
  • Protect calls to SSL_read and SSL_write with a mutex. Since the same SSL object is shared between different threads, the OpenSSL library requires a mutex to be used by @kozlovic in #913
• Memory allocation check by @wooffie in #868
• Add missing status text string by @oldnick85 in #872 and @kozlovic in #874 (the issue was not present in any published release and was introduced in #869)
• Parsing of message headers with NULL or all-whitespace values by @habbbe in #873
• Removed some unused code related to handling of responses and added custom inbox with very long prefix test by @kozlovic in #885. Issue was reported by @yanyongcheng in #884
• Connection drain could cause missed reply and/or a 100ms delay by @kozlovic in #915. Issue was reported by @T-Maxxx in #911

Non-code changes

• Build
  • Deprecated Ubuntu 20.04 in GitHub actions by @levb in #864
  • Removed the older compiler jobs by @levb in #865
  • Fixed Windows build to use the NATS Server main branch by @levb in #866

New Contributors

• @kerbert101 made their first contribution in #862
• @habbbe made their first contribution in #873
• @wolfkor made their first contribution in #871
• @Matus-p made their first contribution in #901