module Redwood
class IMAP < Source
+ SCAN_INTERVAL = 60 # seconds
+
attr_reader_cloned :labels
attr_accessor :username, :password
@imap = nil
@imap_ids = {}
@ids = []
+ @last_scan = nil
@labels = [:unread]
@labels << :inbox unless archived?
@labels << mailbox.intern unless mailbox =~ /inbox/i
@mutex = Mutex.new
end
- def say s
- @say_id = BufferManager.say s, @say_id if BufferManager.instantiated?
- Redwood::log s
- end
- def shutup
- BufferManager.clear @say_id if BufferManager.instantiated?
- @say_id = nil
- end
- private :say, :shutup
-
- def connect
- return false if broken?
- return true if @imap
-
- ## ok, this is FUCKING ANNOYING.
- ##
- ## what imap.rb likes to do is, if an exception occurs, catch it
- ## and re-raise it on the calling thread. seems reasonable. but
- ## what that REALLY means is that the only way to reasonably
- ## initialize imap is in its own thread, because otherwise, you
- ## will never be able to catch the exception it raises on the
- ## calling thread, and the backtrace will not make any sense at
- ## all, and you will waste HOURS of your life on this fucking
- ## problem.
- ##
- ## FUCK!!!!!!!!!
-
- say "Connecting to IMAP server #{host}:#{port}..."
-
- Redwood::reporting_thread do
- begin
- #raise Net::IMAP::ByeResponseError, "simulated imap failure"
- @imap = Net::IMAP.new host, ssl? ? 993 : 143, ssl?
- say "Logging in..."
- @imap.authenticate 'LOGIN', @username, @password
- say "Sizing mailbox..."
- @imap.examine mailbox
- last_id = @imap.responses["EXISTS"][-1]
-
- say "Reading headers (because IMAP sucks)..."
- values = @imap.fetch(1 .. last_id, ['RFC822.SIZE', 'INTERNALDATE'])
-
- say "Successfully connected to #{@parsed_uri}"
-
- values.each do |v|
- id = make_id v
- @ids << id
- @imap_ids[id] = v.seqno
- end
- rescue SocketError, Net::IMAP::Error, SourceError => e
- self.broken_msg = e.message.chomp # fucking chomp! fuck!!!
- @imap = nil
- Redwood::log "error connecting to IMAP server: #{self.broken_msg}"
- ensure
- shutup
- end
- end.join
-
- !!@imap
- end
- private :connect
-
- def make_id imap_stuff
- msize, mdate = imap_stuff.attr['RFC822.SIZE'], Time.parse(imap_stuff.attr["INTERNALDATE"])
- sprintf("%d%07d", mdate.to_i, msize).to_i
- end
- private :make_id
-
def host; @parsed_uri.host; end
def port; @parsed_uri.port || (ssl? ? 993 : 143); end
def mailbox
x = @parsed_uri.path[1..-1]
- x.empty? ? 'INBOX' : x
+ x.nil? || x.empty? ? 'INBOX' : x
end
def ssl?; @parsed_uri.scheme == 'imaps' end
RMail::Parser.read raw_full_message(id)
end
- ## load the full header text
def raw_header id
@mutex.synchronize do
- connect or raise SourceError, broken_msg
- get_imap_field(id, 'RFC822.HEADER').gsub(/\r\n/, "\n")
+ 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
end
def raw_full_message id
@mutex.synchronize do
- connect or raise SourceError, broken_msg
- get_imap_field(id, 'RFC822').gsub(/\r\n/, "\n")
+ connect
+ get_imap_fields(id, 'RFC822').first.gsub(/\r\n/, "\n")
end
end
- def get_imap_field id, field
- retries = 0
- f = nil
- imap_id = @imap_ids[id] or raise SourceError, "Unknown message id #{id}. It is likely that messages have been deleted from this IMAP mailbox."
- begin
- f = @imap.fetch imap_id, [field, 'RFC822.SIZE', 'INTERNALDATE']
- got_id = make_id f[0]
- raise SourceError, "IMAP message mismatch: requested #{id}, got #{got_id}. It is likely the IMAP mailbox has been modified." unless got_id == id
- rescue Net::IMAP::Error => e
- raise SourceError, e.message
- rescue Errno::EPIPE
- if (retries += 1) <= 3
- @imap = nil
- connect
- retry
+ def connect
+ return if broken? || @imap
+
+ say "Connecting to IMAP server #{host}:#{port}..."
+
+ ## apparently imap.rb does a lot of threaded stuff internally and
+ ## if an exception occurs, it will catch it and re-raise it on the
+ ## 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
+ begin
+ #raise Net::IMAP::ByeResponseError, "simulated imap failure"
+ @imap = Net::IMAP.new host, port, ssl?
+ say "Logging in..."
+
+ ## although RFC1730 claims that "If an AUTHENTICATE command
+ ## fails with a NO response, the client may try another", in
+ ## practice it seems like they can also send a BAD response.
+ begin
+ @imap.authenticate 'CRAM-MD5', @username, @password
+ rescue Net::IMAP::BadResponseError, Net::IMAP::NoResponseError => e
+ Redwood::log "CRAM-MD5 authentication failed: #{e.class}. Trying LOGIN auth..."
+ begin
+ @imap.authenticate 'LOGIN', @username, @password
+ rescue Net::IMAP::BadResponseError, Net::IMAP::NoResponseError => e
+ Redwood::log "LOGIN authentication failed: #{e.class}. Trying plain-text LOGIN..."
+ @imap.login @username, @password
+ end
+ end
+ scan_mailbox
+ say "Successfully connected to #{@parsed_uri}." unless broken?
+ rescue SocketError, Net::IMAP::Error, SourceError => e
+ exception = e
+ ensure
+ shutup
end
- end
- raise SourceError, "null IMAP field '#{field}' for message with id #{id} imap id #{imap_id}" if f.nil?
+ end.join
- f[0].attr[field]
+ die_from exception, :while => "connecting" if exception
end
- private :get_imap_field
-
+
def each
- @mutex.synchronize { connect or raise SourceError, broken_msg }
+ @mutex.synchronize { connect }
- start = @ids.index(cur_offset || start_offset)
- start.upto(@ids.length - 1) do |i|
+ 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
def start_offset
- @mutex.synchronize { connect or raise SourceError, broken_msg }
+ @mutex.synchronize { connect }
@ids.first
end
def end_offset
- @mutex.synchronize { connect or raise SourceError, broken_msg }
+ @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
+ end
+
+ def shutup
+ BufferManager.clear @say_id if BufferManager.instantiated?
+ @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
+
+ message =
+ case e
+ when Exception
+ "Error while #{opts[:while]}: #{e.message.chomp} (#{e.class.name})."
+ when String
+ e
+ end
+
+ message += " It is likely that messages have been deleted from this IMAP mailbox. Please run sup-import --rebuild #{to_s} to correct this problem." if opts[:suggest_rebuild]
+
+ self.broken_msg = message
+ Redwood::log message
+ BufferManager.flash "Error communicating with IMAP server. See log for details." if BufferManager.instantiated?
+ raise SourceError, message
+ end
+
+ ## build a fake unique id
+ def make_id imap_stuff
+ # use 7 digits for the size. why 7? seems nice.
+ msize, mdate = imap_stuff.attr['RFC822.SIZE'] % 10000000, Time.parse(imap_stuff.attr["INTERNALDATE"])
+ sprintf("%d%07d", mdate.to_i, msize).to_i
+ end
+
+ def get_imap_fields id, *fields
+ raise SourceError, broken_msg if broken?
+ imap_id = @imap_ids[id] or die_from "Unknown message id #{id}.", :suggest_rebuild => true
+
+ retried = false
+ results = safely { @imap.fetch imap_id, (fields + ['RFC822.SIZE', 'INTERNALDATE']).uniq }.first
+ got_id = make_id results
+ die_from "IMAP message mismatch: requested #{id}, got #{got_id}.", :suggest_rebuild => true unless got_id == id
+
+ fields.map { |f| results.attr[f] }
+ end
+
+ def safely
+ retried = false
+ 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"
+ end
+ end
+ end
+
end
Redwood::register_yaml(IMAP, %w(uri username password cur_offset usual archived id))
projects / sup / blobdiff