## fuck you, imap committee. you managed to design something as shitty
## as mbox but goddamn THIRTY YEARS LATER.
-
module Redwood
class IMAP < Source
SCAN_INTERVAL = 60 # seconds
+ ## upon these errors we'll try to rereconnect a few times
+ RECOVERABLE_ERRORS = [ Errno::EPIPE, Errno::ETIMEDOUT ]
+
attr_reader_cloned :labels
attr_accessor :username, :password
end
def raw_header id
- @mutex.synchronize do
- connect
- header, flags = get_imap_fields id, 'RFC822.HEADER', 'FLAGS'
- header = "Status: RO\n" + header if flags.include? :Seen # fake an mbox-style read header
- header.gsub(/\r\n/, "\n")
- end
+ unsynchronized_scan_mailbox
+ header, flags = get_imap_fields id, 'RFC822.HEADER', 'FLAGS'
+ header = header + "Status: RO\n" if flags.include? :Seen # fake an mbox-style read header # TODO: improve source-marked-as-read reporting system
+ header.gsub(/\r\n/, "\n")
end
+ synchronized :raw_header
def raw_full_message id
- @mutex.synchronize do
- connect
- get_imap_fields(id, 'RFC822').first.gsub(/\r\n/, "\n")
- end
+ unsynchronized_scan_mailbox
+ get_imap_fields(id, 'RFC822').first.gsub(/\r\n/, "\n")
end
+ synchronized :raw_full_message
def connect
return if broken? || @imap
+ safely { } # do nothing!
+ end
+ synchronized :connect
+
+ def scan_mailbox
+ return if @last_scan && (Time.now - @last_scan) < SCAN_INTERVAL
+ last_id = safely do
+ @imap.examine mailbox
+ @imap.responses["EXISTS"].last
+ end
+ @last_scan = Time.now
+
+ return if last_id == @ids.length
+
+ Redwood::log "fetching IMAP headers #{(@ids.length + 1) .. last_id}"
+ values = safely { @imap.fetch((@ids.length + 1) .. last_id, ['RFC822.SIZE', 'INTERNALDATE']) }
+ values.each do |v|
+ id = make_id v
+ @ids << id
+ @imap_ids[id] = v.seqno
+ end
+ end
+ synchronized :scan_mailbox
+
+ def each
+ ids =
+ @mutex.synchronize do
+ unsynchronized_scan_mailbox
+ @ids
+ end
+
+ start = ids.index(cur_offset || start_offset) or die_from "Unknown message id #{cur_offset || start_offset}.", :suggest_rebuild => true # couldn't find the most recent email
+
+ start.upto(ids.length - 1) do |i|
+ id = ids[i]
+ self.cur_offset = id
+ yield id, labels
+ end
+ end
+ def start_offset
+ unsynchronized_scan_mailbox
+ @ids.first
+ end
+ synchronized :start_offset
+
+ def end_offset
+ unsynchronized_scan_mailbox
+ @ids.last
+ end
+ synchronized :end_offset
+
+ def pct_done; 100.0 * (@ids.index(cur_offset) || 0).to_f / (@ids.length - 1).to_f; end
+
+private
+
+ def unsafe_connect
say "Connecting to IMAP server #{host}:#{port}..."
## apparently imap.rb does a lot of threaded stuff internally and
## calling thread. but i can't seem to catch that exception, so
## i've resorted to initializing it in its own thread. surely
## there's a better way.
-
exception = nil
- Redwood::reporting_thread do
+ ::Thread.new do
begin
#raise Net::IMAP::ByeResponseError, "simulated imap failure"
@imap = Net::IMAP.new host, port, ssl?
@imap.login @username, @password
end
end
- scan_mailbox
- say "Successfully connected to #{@parsed_uri}." unless broken?
- rescue SocketError, Net::IMAP::Error, SourceError => e
+ say "Successfully connected to #{@parsed_uri}."
+ rescue Exception => e
exception = e
ensure
shutup
end
end.join
- die_from exception, :while => "connecting" if exception
+ raise exception if exception
end
- def each
- @mutex.synchronize { connect }
-
- start = @ids.index(cur_offset || start_offset) or die_from "Unknown message id #{cur_offset || start_offset}.", :suggest_rebuild => true # couldn't find the most recent email
-
- start.upto(@ids.length - 1) do |i|
- id = @ids[i]
- self.cur_offset = id
- yield id, labels
- end
- end
-
- def start_offset
- @mutex.synchronize { connect }
- @ids.first
- end
-
- def end_offset
- @mutex.synchronize do
- connect
- scan_mailbox
- end
- @ids.last
- end
-
- def pct_done; 100.0 * (@ids.index(cur_offset) || 0).to_f / (@ids.length - 1).to_f; end
-
-private
-
def say s
@say_id = BufferManager.say s, @say_id if BufferManager.instantiated?
Redwood::log s
@say_id = nil
end
- def scan_mailbox
- return if @last_scan && (Time.now - @last_scan) < SCAN_INTERVAL
-
- last_id = safely do
- @imap.examine mailbox
- @imap.responses["EXISTS"].last
- end
-
- @last_scan = Time.now
- return if last_id == @ids.length
- Redwood::log "fetching IMAP headers #{(@ids.length + 1) .. last_id}"
- values = safely { @imap.fetch((@ids.length + 1) .. last_id, ['RFC822.SIZE', 'INTERNALDATE']) }
- values.each do |v|
- id = make_id v
- @ids << id
- @imap_ids[id] = v.seqno
- end
- end
-
def die_from e, opts={}
@imap = nil
fields.map { |f| results.attr[f] }
end
+ ## execute a block, connected if unconnected, re-connected up to 3
+ ## times if a recoverable error occurs, and properly dying if an
+ ## unrecoverable error occurs.
def safely
- retried = false
+ retries = 0
begin
- yield
- rescue Net, SocketError, Net::IMAP::Error => e
- die_from e, :while => "communicating with IMAP server"
- rescue Errno::EPIPE
- unless retried
- retried = true
- @imap = nil
- connect
- retry
- else
- die_from e, :while => "communicating with IMAP server"
+ begin
+ unsafe_connect unless @imap
+ yield
+ rescue *RECOVERABLE_ERRORS
+ if (retries += 1) <= 3
+ @imap = nil
+ retry
+ end
+ raise
end
+ rescue Net, SocketError, Net::IMAP::Error, SystemCallError => e
+ die_from e, :while => "communicating with IMAP server"
end
end
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