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0.22.0

  • Change: semians will trigger on ER_PROXYSQL_MAX_CONN_TIMEOUT with mysql2 (#522)
  • Change: added support for dynamic semian_configurations to the Semian Redis adapter
  • New: Semian.disable_bulkheads_for_thread disables bulkheads for the given thread

v0.21.3

  • Fix: Trilogy ActiveRecord adapter to be compatible with latest Rails edge.

v0.21.2

  • Change: Trilogy ActiveRecord adapter will not bypass "SAVEPOINT RELEASE" unless it uses the ActiveRecord default name and only 2 levels of nesting
  • Change: The bypass for COMMIT/ROLLBACK statements assumes current ActiveRecord behaviour, that is no blank spaces or ";" chracter at the end of the statement

v0.21.1

  • Fix valid_raw_connection check

v0.21.0

  • Fixed compatibility with redis-rb 5.0.7+

v0.20.1

  • More efficient activerecord_trilogy_adapter and mysql2_adapter regex. (#508, #510)

v0.20.0

  • Ensure Active Record Trilogy adapter handles AdapterTimeout and ConnectionFailed exceptions. (#497)
  • Allow passing --with-openssl-dir for a custom OpenSSL installation. (#499)
  • Use ActiveRecord::ConnectionNotEstablished as base error for TrilogyAdapter. (#496)
  • Fix Mysql2 connection error regular expressions. (#506)

v0.19.1

  • Active Record Trilogy adapter needs to patch #raw_execute instead of #execute for queries. (#494)

v0.19.0

  • Redis Readonly errors won't trigger semian open circuit. (#489)
  • New dynamic options, allowing a per-request resource configuration with the HTTP adapter. (#485)

v0.18.1

  • Remove dependency on activerecord-trilogy-adapter in Trilogy adapter for Semian. (#486)
  • Fix: Change in method signature for Trilogy adapter's #execute_method. (#491)

v0.18.0

  • Support Active Record Trilogy adapter. (#468)

v0.17.0

  • Avoid prepending the same prefix twice to errors messages. (#423) This mostly happens with the redis-rb 5+ gem as it translate redis-client errors.
  • Fix running tests in DEBUG mode to test missing semaphores resources. (#430)
  • Semian.register returns UnprotectedResource when environment variable SEMIAN_DISABLED is set. (#427) Introduces environment variables SEMIAN_CIRCUIT_BREAKER_DISABLED to disable only circuit_breaker and SEMIAN_BULKHEAD_DISABLED only bulkhead.
  • Refactor: Replace Time.now with CLOCK_MONOTONIC in Resource updated_at field. (#443) Replace Timecop.travel for tests with custom mock solution to support monotonic clocks.
  • Refactor: Replace Time.now with CLOCK_MONOTONIC in CircuitBreaker. (#441)
  • Support Ruby 3.2.0. (#463)
  • Enable write barrier protection on Resource. (#469)

v0.16.0

  • Typo in error message for missing option :tickets. (#412)
  • Add process id in DEBUG message for bulkheading/resource. (#416)
  • Feature: Add ability to turn off window based circuit eviction (#418)

v0.15.0

  • Pinging a closed connection shouldn't be considered a failure. (#396)
  • Fix: Patch new_client for Rails apps so that the OpenCircuitError makes it through. (#395)

v0.14.0

  • Compatible with Redis 5 (#388, #392)

v0.13.3

  • Add a warning message about redis 5.x. (#386)

v0.13.2

  • Fix: Update AbstractAdapter patch to accomodate recent Rails changes. (#364)

v0.13.1

  • Fix: Raise Redis::OutOfMemoryError for messages that match OOM command not allowed when used memory > 'maxmemory' rather than checking start_with?("OOM "). (#367)

v0.13.0

  • Refactor: Replace Time.now with CLOCK_MONOTONIC in MockServer (#318)
  • Fix: Circuit not open for GRPC::ActiveCall::Operation failures (#348)

v0.12.0

  • Feature: Add support for the redis-client gem (#314)

v0.11.8

  • Feature: Add error_threshold_timeout configuration parameter (#299)

v0.11.7

  • Fix: ECONNRESET won't trigger circuit open for redis (#306)

v0.11.6

  • Fix: pass disable flag by patching new singleton method (#303)

v0.11.5

  • Feature: Add disable flag to http adapter (#301)

v0.11.4

  • Fix: Add extern to global variable declarations for gcc 10 (#288)

v0.11.3

  • Feature: Log last error message on circuit breaker state transition (#285)
  • Fix: Update README and docs to resolve common misconception about error_threshold (#283)

v0.11.2

  • Fix: Remove MySQL client is not connected error from mysql2 adapter

v0.11.1

  • Feature: Add Semian.namespace to globally prefix all the semaphore names. (#280)

v0.11.0

  • Feature: Add Semian.default_permissions to globally change the default semaphore permissions. (#279)

v0.10.6

  • Fix: Match whitelisted SQL queries when Marginalia is prepended (#276)

v0.10.5

  • Fix: Compatibility with GC.compact

v0.10.4

  • Fix: Revert the changes in v0.10.3. (#270)

v0.10.3

  • Fix: Positional/Keyword arguments deprecations warning for Ruby 2.7 in the grpc adapter. (#269)

v0.10.2

  • Fix: Positional/Keyword arguments deprecations warning for Ruby 2.7.

v0.10.1

  • Fix: thread safety bug on Ruby 2.7. (#263)

v0.10.0

  • Feature: Support half open resource timeout for redis.

v0.9.1

  • Fix: Compatibility with MRI 2.3

v0.9.0

  • Feature: Add a LRU to garbage collect old resources. (#193)

v0.8.9

  • Fix: Recursion issue in MySQL2 adapter causing circuits breakers to stay open much longer than they should. (#250)
  • Fix: Better handle DNS resolutions exceptions in Redis adapter. (#230)

v0.8.8

  • Feature: Introduce the GRPC adapter (#200)

v0.8.7

  • Fix: Instrument success for acquire_circuit_breaker (#209)

v0.8.6

  • Feature: If an error instance responds to #marks_semian_circuits? don't mark the circuit if it returns false (#210)

v0.8.5

  • Fix: Redis adapter using hiredis is resilient to DNS resolution failures (#205)

v0.8.4

  • Feature: Introduce half_open_resource_timeout which changes the resource timeout when the circuit is in a half-open state for the Net::HTTP adapter. (#198)
  • Feature: Add the cause of the last error when a circuit opens (#197)
  • Fix: Reset successes when transitioning to the half open state (#192)

v0.8.1

  • Fix: Expose half_open? when the circuit state has not transitioned but will. This allows consumers further up the stack to know if the circuit is half open.

v0.8.0

  • Feature: Introduce half_open_resource_timeout which changes the resource timeout when the circuit is in a half-open state (#188)

v0.7.8

  • Feature: More informative error messages when initializing Semian with missing arguments (#182)
  • Fix: Redis adapter is now resilient to DNS resolution failures (#184)

v0.7.5

  • Fix: Repaired compatibility with dependent Redis library

v0.7.4

  • Fix: Protect internal semaphore when adjusting resource count (#164)
  • Feature: Use prepend when monkey-patching Net::HTTP. (#157)
  • Feature: Include time spend waiting for bulkhead in notification (#154)

v0.7.1

  • Feature: Add the behaviour to enable open circuiting on 5xxs conditionally (#149)
  • Refactor: Configurable hosts for Semian's development dependencies (#152)

v0.7.0

This change introduced a series of changes to support a new "dynamic quota" ticket allocation strategy. This code primarily affects bulkheads (protected resources).

Rather than statically setting a ticket count, workers (in their own process) now register themselves. By specifying 'quota' instead of 'tickets', the bulkhead threshold will now be computed dynamically as a ratio of the number of registered workers, eliminating the need to continuously readjust ticket counts, and supporting environments with non-uniform worker distribution between machines.

  • Feature: Support quota based allocation strategy (#120)
  • Feature: Add ability to manually unregister workers (#130)
  • Feature: Add ability to clear resources from adapters and unregister all resources (#134)
  • Feature: Allow sysV IPC key to be accessed in ruby (#136)
  • Feature: Expose registered worker count to ruby (#137)
  • Refactor: Allow registered worker count to be accessed through bulkhead (#138)
  • Bug fix: Register all workers (#128)
  • Bug fix: Lazy instantiate redis clien on first I/O (#132)
  • Bug fix: New mysql error (#131)
  • Bug fix: Prevent race conditions when unregistering (#141)
  • Refactor/Feature: Break coupling between resource and circuit breaker (#123)
  • Refactor: Use generic max_sem_val (#117)
  • Refactor: Fix header syntax (#118)
  • Refactor: Always acquire semaphore without_gvl (#121)
  • Thread-safety for circuit breakers by default (#150)
  • Fix bug where calling name on a protected resource without a semaphore would fail (#151)

v0.6.2

  • Refactor: Refactor semian ticket management into its own files (#116)
  • Refactor: Create sem_meta_lock and sem_meta_unlock (#115)
  • Refactor: Refactor semaphore operations (#114)

v0.6.1

  • Refactor: Generate a unique semaphore key by including size of semaphore set
  • Refactor: Refactor semian_resource related C functions
  • Fix: Don't require sudo for travis (#110)
  • Refactor: Refactor semian.c includes and types into header files
  • Fix: Use glob instead of git for gemspec file list
  • Fix: Fix travis CI for ruby 2.3.0 installing rainbows
  • Refactor: Switch to enumerated type for tracking semaphore indices
  • Docs: readme: explain co-operation between cbs and bulkheads
  • Docs: readme: add section about server limits

v0.6.0

  • Feature: Load semian/rails automatically if necessary
  • Feature: Implement AR::AbstractAdapter#semian_resource

v0.5.4

  • Fix: Also let "Too many connections" be a first class conn error

v0.5.3

  • Fix: mysql: protect pings
  • Fix: mysql: match more lost conn queries

v0.5.2

  • Fix: Make request_allowed? thread safe
  • Fix: Fix CI connect errors on HTTP requests by using 127.0.0.1 for host

v0.5.1

  • Fix: Assert Resource#initialize_semaphore contract on Resource init
  • Fix: Lock on older thin version for pre MRI 2.2 compatibility

v0.5.0

  • Fix: Only issue unsupported or disabled semaphores warnings when the first resource is instanciated
  • Refactor: Cleanup requires
  • Maintenance: Use published version of the toxiproxy gem
  • Fix: Fix minitest deprecation warnings
  • Maintenance: Update bundler on travis
  • Maintenance: Update supported MRI versions on travis

v0.4.3

  • Fix: Fix lazy aliasing of Redis#semian_resource
  • Fix: Workaround rubocop parser limitations

v0.4.2

  • Fix: Fix for TimeoutError is deprecated in Ruby 2.3.0
  • Feature: Include Ruby 2.3 in Travis builds

v0.4.1

  • Fix: resource: cast float ticket count to fixnum #75

v0.4.0

  • Feature: net/http: add adapter for net/http #58
  • Refactor: circuit_breaker: split circuit breaker into three data structures to allow for alternative implementations in the future #62
  • Fix: mysql: don't prevent rollbacks on transactions #60
  • Fix: core: fix initialization bug when the resource is accessed before the options are set #65