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Merge pull request #1340 from cantino/post_agent_downcase_response_headers

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Downcase header names in Events that PostAgent emits
This commit is contained in:
Akinori MUSHA 2016-04-12 16:31:04 +09:00
commit 4280bdc5e0
3 changed files with 72 additions and 3 deletions
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42
app/models/agents/post_agent.rb
View file

@ -25,6 +25,13 @@ module Agents
If `emit_events` is set to `true`, the server response will be emitted as an Event and can be fed to a WebsiteAgent for parsing (using its `data_from_event` and `type` options). No data processing
will be attempted by this Agent, so the Event's "body" value will always be raw text.
The Event will also have a "headers" hash and a "status" integer value.
Set `event_headers_style` to one of the following values to normalize the keys of "headers" for downstream agents' convenience:
* `capitalized` (default) - Header names are capitalized; e.g. "Content-Type"
* `downcased` - Header names are downcased; e.g. "content-type"
* `snakecased` - Header names are snakecased; e.g. "content_type"
* `raw` - Backward compatibility option to leave them unmodified from what the underlying HTTP library returns.
Other Options:
@ -92,6 +99,12 @@ module Agents
errors.add(:base, "if provided, emit_events must be true or false")
end
begin
normalize_response_headers({})
rescue ArgumentError => e
errors.add(:base, e.message)
end
unless %w[post get put delete patch].include?(method)
errors.add(:base, "method must be 'post', 'get', 'put', 'delete', or 'patch'")
end
@ -124,6 +137,29 @@ module Agents
private
def normalize_response_headers(headers)
case interpolated['event_headers_style']
when nil, '', 'capitalized'
normalize = ->name {
name.gsub(/(?:\A|(?<=-))([[:alpha:]])|([[:alpha:]]+)/) {
$1 ? $1.upcase : $2.downcase
}
}
when 'downcased'
normalize = :downcase.to_proc
when 'snakecased', nil
normalize = ->name { name.tr('A-Z-', 'a-z_') }
when 'raw'
normalize = ->name { name } # :itself.to_proc in Ruby >= 2.2
else
raise ArgumentError, "if provided, event_headers_style must be 'capitalized', 'downcased', 'snakecased' or 'raw'"
end
headers.each_with_object({}) { |(key, value), hash|
hash[normalize[key]] = value
}
end
def handle(data, payload = {})
url = interpolated(payload)[:post_url]
headers = headers()
@ -156,7 +192,11 @@ module Agents
}
if boolify(interpolated['emit_events'])
create_event payload: { body: response.body, headers: response.headers, status: response.status }
create_event payload: {
body: response.body,
headers: normalize_response_headers(response.headers),
status: response.status
}
end
end
end

11
db/migrate/20160405072512_post_agent_set_event_header_style.rb Normal file
View file

@ -0,0 +1,11 @@
class PostAgentSetEventHeaderStyle < ActiveRecord::Migration
def up
Agent.of_type("Agents::PostAgent").each do |post_agent|
if post_agent.send(:boolify, post_agent.options['emit_events']) &&
!post_agent.options.key?('event_headers_style')
post_agent.options['event_headers_style'] = 'raw'
post_agent.save!
end
end
end
end

22
spec/models/agents/post_agent_spec.rb
View file

@ -52,7 +52,7 @@ describe Agents::PostAgent do
raise "unexpected Content-Type: #{content_type}"
end
end
{ status: 200, body: "<html>a webpage!</html>", headers: { 'Content-Type' => 'text/html' } }
{ status: 200, body: "<html>a webpage!</html>", headers: { 'Content-type' => 'text/html' } }
}
end
@ -226,10 +226,28 @@ describe Agents::PostAgent do
expect(@checker.events.last.payload['body']).to eq '<html>a webpage!</html>'
end
it "emits the response headers" do
it "emits the response headers capitalized by default" do
@checker.check
expect(@checker.events.last.payload['headers']).to eq({ 'Content-Type' => 'text/html' })
end
it "emits the response headers capitalized" do
@checker.options['event_headers_style'] = 'capitalized'
@checker.check
expect(@checker.events.last.payload['headers']).to eq({ 'Content-Type' => 'text/html' })
end
it "emits the response headers downcased" do
@checker.options['event_headers_style'] = 'downcased'
@checker.check
expect(@checker.events.last.payload['headers']).to eq({ 'content-type' => 'text/html' })
end
it "emits the response headers snakecased" do
@checker.options['event_headers_style'] = 'snakecased'
@checker.check
expect(@checker.events.last.payload['headers']).to eq({ 'content_type' => 'text/html' })
end
end
end
end