Add Heka log decoder infrastructure

In the future the Heka Lua sandboxes will be moved out of Kolla, and
installed in the Heka container using a deb or rpm package.

Partially implements: blueprint heka
Change-Id: I34cc80f62ddbca8ee330c971f58fee8686e245e6

docker/heka/Dockerfile.j2

@@ -14,6 +14,10 @@ RUN curl --location https://github.com/mozilla-services/heka/releases/download/v
 
 {% endif %}
 
+COPY plugins/modules /usr/share/heka/lua_modules/
+COPY plugins/decoders /usr/share/heka/lua_decoders/
+COPY plugins/encoders /usr/share/heka/lua_encoders/
+
 COPY heka_sudoers /etc/sudoers.d/heka_sudoers
 COPY extend_start.sh /usr/local/bin/kolla_extend_start
 

docker/heka/plugins/decoders/os_syslog.lua

+-- Copyright 2016 Mirantis, Inc.
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+--
+-- The code in this file was inspired by Heka's rsyslog.lua decoder plugin.
+-- https://github.com/mozilla-services/heka/blob/master/sandbox/lua/decoders/rsyslog.lua
+
+local syslog = require "syslog"
+local utils = require "os_utils"
+
+local msg = {
+    Timestamp   = nil,
+    Type        = 'Syslog',
+    Hostname    = read_config("hostname"),
+    Payload     = nil,
+    Pid         = nil,
+    Severity    = nil,
+    Fields      = nil
+}
+
+-- See https://tools.ietf.org/html/rfc3164
+local grammar = syslog.build_rsyslog_grammar('<%PRI%>%TIMESTAMP% %syslogtag% %msg%')
+
+function process_message ()
+    local log = read_message("Payload")
+    local fields = grammar:match(log)
+    if not fields then return -1 end
+
+    msg.Timestamp = fields.timestamp
+    fields.timestamp = nil
+
+    msg.Severity = fields.pri.severity
+    fields.syslogfacility = fields.pri.facility
+    fields.pri = nil
+
+    fields.programname = fields.syslogtag.programname
+    msg.Pid = fields.syslogtag.pid
+    fields.syslogtag = nil
+
+    msg.Payload = fields.msg
+    fields.msg = nil
+
+    msg.Fields = fields
+    return utils.safe_inject_message(msg)
+end

docker/heka/plugins/encoders/os_syslog.lua

+-- Copyright 2016 Mirantis, Inc.
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+require "string"
+
+local interpolate = require "msg_interpolate"
+local utils = require "os_utils"
+
+local header_template = "<%{Severity}>%{%FT%TZ} %{Hostname} %{programname}[%{Pid}]:"
+
+function process_message()
+    local timestamp = read_message("Timestamp") / 1e9
+    local header = interpolate.interpolate_from_msg(header_template, timestamp)
+    local payload = string.format("%s %s\n", header, read_message("Payload"))
+    return utils.safe_inject_payload("txt", "", payload)
+end

docker/heka/plugins/modules/os_patterns.lua

+-- Copyright 2015-2016 Mirantis, Inc.
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+local table  = require 'table'
+local dt     = require "date_time"
+local l      = require 'lpeg'
+l.locale(l)
+
+local tonumber = tonumber
+
+local M = {}
+setfenv(1, M) -- Remove external access to contain everything in the module
+
+function format_uuid(t)
+    return table.concat(t, '-')
+end
+
+function anywhere (patt)
+  return l.P {
+    patt + 1 * l.V(1)
+  }
+end
+
+sp = l.space
+colon = l.P":"
+dash = l.P"-"
+dot = l.P'.'
+quote = l.P'"'
+
+local x4digit = l.xdigit * l.xdigit * l.xdigit * l.xdigit
+local uuid_dash = l.C(x4digit * x4digit * dash * x4digit * dash * x4digit * dash * x4digit * dash * x4digit * x4digit * x4digit)
+local uuid_nodash = l.Ct(l.C(x4digit * x4digit) * l.C(x4digit) * l.C(x4digit) * l.C(x4digit) * l.C(x4digit * x4digit * x4digit)) / format_uuid
+
+-- Return a UUID string in canonical format (eg with dashes)
+Uuid = uuid_nodash + uuid_dash
+
+-- Parse a datetime string and return a table with the following keys
+--   year (string)
+--   month (string)
+--   day (string)
+--   hour (string)
+--   min (string)
+--   sec (string)
+--   sec_frac (number less than 1, can be nil)
+--   offset_sign ('-' or '+', can be nil)
+--   offset_hour (number, can be nil)
+--   offset_min (number, can be nil)
+--
+-- The datetime string can be formatted as
+-- 'YYYY-MM-DD( |T)HH:MM:SS(.ssssss)?(offset indicator)?'
+TimestampTable = l.Ct(dt.rfc3339_full_date * (sp + l.P"T") * dt.rfc3339_partial_time * (dt.rfc3339_time_offset + dt.timezone_offset)^-1)
+
+-- Returns the parsed datetime converted to nanosec
+Timestamp = TimestampTable / dt.time_to_ns
+
+programname   = (l.R("az", "AZ", "09") + l.P"." + dash + l.P"_")^1
+Pid           = l.digit^1
+SeverityLabel = l.P"CRITICAL" + l.P"ERROR" + l.P"WARNING" + l.P"INFO" + l.P"AUDIT" + l.P"DEBUG"
+Message       = l.P(1)^0
+
+-- Capture for OpenStack logs producing four values: Timestamp, Pid,
+-- SeverityLabel, PythonModule and Message.
+--
+-- OpenStack log messages are of this form:
+-- 2015-11-30 08:38:59.306 3434 INFO oslo_service.periodic_task [-] Blabla...
+--
+-- [-] is the "request" part, it can take multiple forms. See below.
+openstack = l.Ct(l.Cg(Timestamp, "Timestamp")* sp * l.Cg(Pid, "Pid") * sp *
+    l.Cg(SeverityLabel, "SeverityLabel") * sp * l.Cg(programname, "PythonModule") *
+    sp * l.Cg(Message, "Message"))
+
+-- Capture for OpenStack request context producing three values: RequestId,
+-- UserId and TenantId.
+--
+-- Notes:
+--
+-- OpenStack logs include a request context, enclosed between square brackets.
+-- It takes one of these forms:
+--
+-- [-]
+-- [req-0fd2a9ba-448d-40f5-995e-33e32ac5a6ba - - - - -]
+-- [req-4db318af-54c9-466d-b365-fe17fe4adeed 8206d40abcc3452d8a9c1ea629b4a8d0 112245730b1f4858ab62e3673e1ee9e2 - - -]
+--
+-- In the 1st case the capture produces nil.
+-- In the 2nd case the capture produces one value: RequestId.
+-- In the 3rd case the capture produces three values: RequestId, UserId, TenantId.
+--
+-- The request id  may be formatted as 'req-xxx' or 'xxx' depending on the project.
+-- The user id and tenant id may not be present depending on the OpenStack release.
+openstack_request_context = (l.P(1) - "[" )^0 * "[" * l.P"req-"^-1 *
+    l.Ct(l.Cg(Uuid, "RequestId") * sp * ((l.Cg(Uuid, "UserId") * sp *
+    l.Cg(Uuid, "TenantId")) + l.P(1)^0)) - "]"
+
+local http_method = l.Cg(l.R"AZ"^3, "http_method")
+local url = l.Cg( (1 - sp)^1, "http_url")
+local http_version = l.Cg(l.digit * dot * l.digit, "http_version")
+
+-- Pattern for the "<http_method> <http_url> HTTP/<http_version>" format found
+-- found in both OpenStack and Apache log files.
+-- Example : OPTIONS /example.com HTTP/1.0
+http_request = http_method * sp * url * sp * l.P'HTTP/' * http_version
+
+-- Patterns for HTTP status, HTTP response size and HTTP response time in
+-- OpenLayers logs.
+--
+-- Notes:
+-- Nova changes the default log format of eventlet.wsgi (see nova/wsgi.py) and
+-- prefixes the HTTP status, response size and response time values with
+-- respectively "status: ", "len: " and "time: ".
+-- Other OpenStack services just rely on the default log format.
+-- TODO(pasquier-s): build the LPEG grammar based on the log_format parameter
+-- passed to eventlet.wsgi.server similar to what the build_rsyslog_grammar
+-- function does for RSyslog.
+local openstack_http_status = l.P"status: "^-1 * l.Cg(l.digit^3, "http_status")
+local openstack_response_size = l.P"len: "^-1 * l.Cg(l.digit^1 / tonumber, "http_response_size")
+local openstack_response_time = l.P"time: "^-1 * l.Cg(l.digit^1 * dot^0 * l.digit^0 / tonumber, "http_response_time")
+
+-- Capture for OpenStack HTTP producing six values: http_method, http_url,
+-- http_version, http_status, http_response_size and http_response_time.
+openstack_http = anywhere(l.Ct(
+    quote * http_request * quote * sp *
+    openstack_http_status * sp * openstack_response_size * sp *
+    openstack_response_time
+))
+
+-- Capture for IP addresses producing one value: ip_address.
+ip_address = anywhere(l.Ct(
+    l.Cg(l.digit^-3 * dot * l.digit^-3 * dot * l.digit^-3 * dot * l.digit^-3, "ip_address")
+))
+
+-- Pattern used to match the beginning of a Python Traceback.
+traceback = l.P'Traceback (most recent call last):'
+
+return M

docker/heka/plugins/modules/os_utils.lua

+-- Copyright 2015-2016 Mirantis, Inc.
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+local cjson = require 'cjson'
+local string = require 'string'
+
+local patt  = require 'os_patterns'
+
+local pairs = pairs
+local inject_message = inject_message
+local inject_payload = inject_payload
+local read_message = read_message
+local pcall = pcall
+
+local M = {}
+setfenv(1, M) -- Remove external access to contain everything in the module
+
+severity_to_label_map = {
+    [0] = 'EMERGENCY',
+    [1] = 'ALERT',
+    [2] = 'CRITICAL',
+    [3] = 'ERROR',
+    [4] = 'WARNING',
+    [5] = 'NOTICE',
+    [6] = 'INFO',
+    [7] = 'DEBUG',
+}
+
+label_to_severity_map = {
+    EMERGENCY = 0,
+    ALERT = 1,
+    CRITICAL = 2,
+    ERROR = 3,
+    WARNING = 4,
+    NOTICE = 5,
+    INFO= 6,
+    DEBUG = 7,
+}
+
+function chomp(s)
+    return string.gsub(s, "\n$", "")
+end
+
+-- Call inject_message() wrapped by pcall()
+function safe_inject_message(msg)
+    local ok, err_msg = pcall(inject_message, msg)
+    if not ok then
+        return -1, err_msg
+    else
+        return 0
+    end
+end
+
+-- Call inject_payload() wrapped by pcall()
+function safe_inject_payload(payload_type, payload_name, data)
+    local ok, err_msg = pcall(inject_payload, payload_type, payload_name, data)
+    if not ok then
+        return -1, err_msg
+    else
+        return 0
+    end
+end
+
+-- Shallow comparison between two tables.
+-- Return true if the two tables have the same keys with identical
+-- values, otherwise false.
+function table_equal(t1, t2)
+    -- all key-value pairs in t1 must be in t2
+    for k, v in pairs(t1) do
+        if t2[k] ~= v then return false end
+    end
+    -- there must not be other keys in t2
+    for k, v in pairs(t2) do
+        if t1[k] == nil then return false end
+    end
+    return true
+end
+
+return M