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added support for 128bit murmur variant #42

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added support for 128bit murmur variant #42

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15 changes: 14 additions & 1 deletion lib/logstash/filters/fingerprint.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -61,7 +61,7 @@ class LogStash::Filters::Fingerprint < LogStash::Filters::Base
# If set to `UUID`, a
# https://en.wikipedia.org/wiki/Universally_unique_identifier[UUID] will
# be generated. The result will be random and thus not a consistent hash.
config :method, :validate => ['SHA1', 'SHA256', 'SHA384', 'SHA512', 'MD5', "MURMUR3", "IPV4_NETWORK", "UUID", "PUNCTUATION"], :required => true, :default => 'SHA1'
config :method, :validate => ['SHA1', 'SHA256', 'SHA384', 'SHA512', 'MD5', "MURMUR3", "MURMUR3_128", "IPV4_NETWORK", "UUID", "PUNCTUATION"], :required => true, :default => 'SHA1'

# When set to `true` and `method` isn't `UUID` or `PUNCTUATION`, the
# plugin concatenates the names and values of all fields given in the
Expand Down Expand Up @@ -94,6 +94,8 @@ def register
class << self; alias_method :fingerprint, :fingerprint_ipv4_network; end
when :MURMUR3
class << self; alias_method :fingerprint, :fingerprint_murmur3; end
when :MURMUR3_128
class << self; alias_method :fingerprint, :fingerprint_murmur3_128; end
when :UUID
# nothing
when :PUNCTUATION
Expand Down Expand Up @@ -179,6 +181,17 @@ def fingerprint_murmur3(value)
end
end

def fingerprint_murmur3_128(value)
case value
when Fixnum
MurmurHash3::V128.int32_hash(value, 2)
when Bignum
MurmurHash3::V128.int64_hash(value, 2)
else
MurmurHash3::V128.str_hash(value.to_s, 2)
end
end

def select_digest(method)
case method
when :SHA1
Expand Down