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.direnv
.pre-commit-config.yaml
nixpkgs
config.yaml
dist-newstyle
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.envrc
state.sqlite

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# Revision history for nixpkgs-bot
## 0.1.0.0 -- YYYY-mm-dd
* First version. Released on an unsuspecting world.

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GNU AFFERO GENERAL PUBLIC LICENSE
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How to Apply These Terms to Your New Programs
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For more information on this, and how to apply and follow the GNU AGPL, see
<http://www.gnu.org/licenses/>.

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schema: vendor/github-schema.graphql
documents: graphql/*.graphql
hsSourceDir: lib/
apiModule: NixpkgsBot.GraphQL.API
enumsModule: NixpkgsBot.GraphQL.Enums
scalarsModule: NixpkgsBot.GraphQL.Scalars

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apps/nixpkgs-bot/exe/Main.hs Normal file
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{-# OPTIONS_GHC -Wno-orphans #-}
module Main (main) where
import qualified Control.Exception as Exception
import Control.Monad.Catch (MonadMask)
import qualified Control.Monad.Catch as MonadCatch
import qualified Control.Monad.Except as Except
import qualified Control.Monad.Logger as MonadLogger
import qualified Control.Monad.Trans.Resource as ResourceT
import Data.GraphQL (get)
import qualified Data.GraphQL as GraphQL
import qualified Data.List.NonEmpty as NonEmpty
import qualified Data.Map.Strict as Map
import qualified Data.Text as Text
import qualified Data.Time as Time
import Data.Yaml (FromJSON)
import qualified Data.Yaml as Yaml
import Database.Esqueleto.Experimental (notIn, (&&.), (<.), (==.), (^.))
import qualified Database.Esqueleto.Experimental as SQL
import qualified Database.Persist as Persist
import qualified Database.Persist.Sqlite as Persist.Sqlite
import qualified Database.Persist.TH as Persist
import qualified Network.HTTP.Client as HTTP
import qualified Network.Matrix.Client as Matrix
import qualified NixpkgsBot.GraphQL.API as GraphQL.API
import Relude hiding (get)
import qualified System.Clock as Clock
import qualified System.Environment as System
import qualified System.Process.Typed as Process
import qualified System.Random as Random
data Repo = MkRepo
{ localPath :: FilePath
, owner :: Text
, name :: Text
}
deriving stock (Generic)
deriving anyclass (FromJSON)
data Config = MkConfig
{ server :: Text
, database :: Text
, repo :: Repo
, branches :: Map Text [Text]
}
deriving stock (Generic)
deriving anyclass (FromJSON)
loadCredential :: String -> IO Text
loadCredential name = do
credentials_directory <- System.getEnv "CREDENTIALS_DIRECTORY"
Text.strip . toText <$> readFile (credentials_directory <> "/" <> name)
Persist.share
[Persist.mkPersist Persist.sqlSettings, Persist.mkMigrate "migrateAll"]
[Persist.persistLowerCase|
Branch
name Text
commit Text
deriving Eq Show
Primary name
Subscription
user Text
pullRequest PullRequestId OnDeleteCascade
Primary user pullRequest
deriving Eq Show
Query
user Text
room Text
deriving Eq Show
Primary user
SessionState
key Text
value Text
deriving Eq Show
Primary key
PullRequest
number Int
title Text
base Text
deriving Eq Show
Primary number
Merge
number PullRequestId OnDeleteCascade
commit Text
deriving Eq Show
Primary number
Arrival
number PullRequestId OnDeleteCascade
branch BranchId OnDeleteCascade
Primary number branch
Invite
room Text
at Time.UTCTime
tries Int
deriving Eq Show
Primary room
AuthorSubscription
user Text
githubLogin Text
deriving Eq Show
Primary user githubLogin
|]
data Commit = Commit
{ commitId :: Text
, commitTitle :: Text
}
deriving stock (Show, Eq)
getEnv :: (Environment -> a) -> App a
getEnv getter = lift $ lift $ lift $ asks getter
instance Exception Matrix.MatrixError
instance Exception Text
unwrapMatrixErrorT :: (MonadMask m, MonadIO m) => Matrix.MatrixM m a -> m a
unwrapMatrixErrorT action = do
message_response <- Matrix.retry action
case message_response of
Left matrix_error -> do
liftIO $ Exception.throwIO matrix_error
Right response -> pure response
unwrapMatrixError :: MonadIO m => Matrix.MatrixIO a -> m a
unwrapMatrixError = liftIO . unwrapMatrixErrorT
git :: Config -> [String] -> Process.ProcessConfig () () ()
git config command = Process.proc "git" ("-C" : localPath (repo config) : command)
gitShow :: [String] -> App [Commit]
gitShow reference = do
conf <- getEnv config
raw_commits <- Process.readProcessStdout_ $ git conf $ "show" : "-s" : "--format=format:%H %s" : reference
pure $ uncurry Commit . second (Text.drop 1) . Text.breakOn " " <$> lines (decodeUtf8 raw_commits)
originBranch :: Text -> String
originBranch = ("origin/" <>) . toString
baseUrl :: App Text
baseUrl = do
owner_ <- getEnv (owner . repo . config)
name_ <- getEnv (name . repo . config)
pure $ "https://github.com/" <> owner_ <> "/" <> name_ <> "/"
commitHTML :: Commit -> App MessageText
commitHTML Commit{commitId, commitTitle} = repoLink ("commit/" <> commitId) (Text.take 7 commitId <> " " <> commitTitle)
link :: Text -> Text -> MessageText
link url label = (label, "<a href=\"" <> url <> "\">" <> label <> "</a>")
repoLink :: Text -> Text -> App MessageText
repoLink url label = do
prefix <- baseUrl
pure $ link (prefix <> url) label
branchHTML :: Text -> App MessageText
branchHTML branch = repoLink ("tree/" <> branch) branch
prHTML :: PRInfo -> App MessageText
prHTML
(PullRequest{pullRequestNumber, pullRequestTitle}, branches) = do
branch_info <- forM branches \(arrived, branch) -> (m (if arrived then "✅ " else "⏳") <>) <$> branchHTML branch
link_ <-
repoLink
("pull/" <> show pullRequestNumber)
("#" <> show pullRequestNumber <> " " <> pullRequestTitle)
pure $ link_ <> if null branches then m "" else m " " <> intercalateMsgPlain " " branch_info
type MessageText = (Text, Text)
intercalateMsg :: Text -> Text -> [MessageText] -> MessageText
intercalateMsg plain html msgs = (Text.intercalate plain (fmap fst msgs), Text.intercalate html (fmap snd msgs))
intercalateMsgPlain :: Text -> [MessageText] -> MessageText
intercalateMsgPlain x = intercalateMsg x x
unlinesMsg :: [MessageText] -> MessageText
unlinesMsg = intercalateMsg "\n" "<br>"
m :: Text -> MessageText
m x = (x, x)
mention :: Text -> MessageText
mention user = link ("https://matrix.to/#/" <> user) user
data Environment = MkEnvironment
{ config :: Config
, matrixSession :: Matrix.ClientSession
, githubToken :: Text
, lastWatch :: IORef Clock.TimeSpec
, lastMaintenance :: IORef Clock.TimeSpec
}
type App = ReaderT Persist.Sqlite.SqlBackend (MonadLogger.NoLoggingT (ResourceT.ResourceT (ReaderT Environment IO)))
type PRInfo = (PullRequest, [(Bool, Text)])
reachedBranches :: PullRequest -> App [(Bool, Text)]
reachedBranches pr = hasArrived (pullRequestBase pr)
where
hasArrived :: Text -> App [(Bool, Text)]
hasArrived branch = do
arrived <- isJust <$> Persist.get (ArrivalKey (PullRequestKey (pullRequestNumber pr)) (BranchKey branch))
nextBranches <- fromMaybe [] <$> getEnv (Map.lookup branch . branches . config)
((arrived, branch) :) . join <$> mapM hasArrived nextBranches
discoverReachedBranches :: PullRequest -> Merge -> App ()
discoverReachedBranches pr merge = do
set_arrived (pullRequestBase pr)
check_arrived_in_next (pullRequestBase pr)
where
set_arrived branch = Persist.insert_ (Arrival (PullRequestKey (pullRequestNumber pr)) (BranchKey branch))
check_arrived_in_next :: Text -> App ()
check_arrived_in_next branch = do
next_branches <- fromMaybe [] <$> getEnv (Map.lookup branch . branches . config)
forM_ next_branches check_arrived
check_arrived :: Text -> App ()
check_arrived branch = do
commits_without <- gitShow [toString (mergeCommit merge), "--not", originBranch branch, "-1"]
when (null commits_without) do
set_arrived branch
check_arrived_in_next branch
queryGraphQL :: (GraphQL.GraphQLQuery a) => a -> App (GraphQL.Object (GraphQL.ResultSchema a))
queryGraphQL query = do
github_token <- getEnv githubToken
GraphQL.runGraphQLQueryT
GraphQL.defaultGraphQLSettings
{ GraphQL.url = "https://api.github.com/graphql"
, GraphQL.modifyReq = \r ->
r
{ HTTP.requestHeaders =
HTTP.requestHeaders r
<> [ ("User-Agent", "nixpkgs-bot")
, ("Authorization", "Bearer " <> encodeUtf8 github_token)
]
}
}
$ GraphQL.runQuery query
type PRSchema = [GraphQL.unwrap| (GraphQL.API.PullRequestSchema).repository!.pullRequest! |]
type RateLimitSchema = [GraphQL.unwrap| (GraphQL.API.PullRequestSchema).rateLimit! |]
extractPR :: PRSchema -> App (PullRequest, Maybe Merge, Text)
extractPR pr = do
when (isNothing [get|pr.mergeCommit|] && [get|pr.merged|]) $ MonadCatch.throwM ("PR is merged but has no merge commit:" <> show pr :: Text)
pure
( PullRequest
{ pullRequestNumber = [get|pr.number|]
, pullRequestTitle = [get|pr.title|]
, pullRequestBase = [get|pr.baseRefName|]
}
, [get|pr.mergeCommit|] <&> \commit ->
Merge
{ mergeNumber = PullRequestKey [get|pr.number|]
, mergeCommit = [get|commit.oid|]
}
, [get|pr.author!.login|]
)
getMissingAuthorSubscriptions :: Persist.Key PullRequest -> Text -> App [Text]
getMissingAuthorSubscriptions pr_key author = do
let users_subscribed_to_this_pr = do
sub <- SQL.from $ SQL.table @Subscription
SQL.where_ (sub ^. SubscriptionPullRequest ==. SQL.val pr_key)
pure (sub ^. SubscriptionUser)
author_subs <- SQL.select $ do
author_sub <- SQL.from $ SQL.table @AuthorSubscription
SQL.where_
( author_sub ^. AuthorSubscriptionGithubLogin ==. SQL.val author
SQL.&&. author_sub ^. AuthorSubscriptionUser `notIn` SQL.subSelectList users_subscribed_to_this_pr
)
pure author_sub
pure $ fmap (authorSubscriptionUser . Persist.entityVal) author_subs
checkRateLimit :: RateLimitSchema -> App ()
checkRateLimit rateLimit = when ([get|rateLimit.remaining|] < warn_threshold) $ putTextLn $ show rateLimit
where
-- Currently github grants 5000 queries per hour
-- The threshold should probably be lower, but for debugging purposes, I currently want to see everytime a graphql Query happens.
warn_threshold = 5000
queryPR :: Persist.Key PullRequest -> App (PullRequest, Maybe Merge, Text)
queryPR (PullRequestKey number) = do
owner <- getEnv (owner . repo . config)
name <- getEnv (name . repo . config)
result <- queryGraphQL GraphQL.API.PullRequestQuery{GraphQL.API._number = number, _owner = owner, _name = name}
putText $ "PRQuery: " <> show number <> " "
checkRateLimit [get|result.rateLimit!|]
extractPR [get|result.repository!.pullRequest!|]
getPRInfo :: Persist.Key PullRequest -> App (Maybe PRInfo)
getPRInfo pr_key = do
savedPRInfoMaybe <- Persist.get pr_key
case savedPRInfoMaybe of
Just savedPRInfo -> do
branches <- reachedBranches savedPRInfo
pure $ Just (savedPRInfo, branches)
Nothing -> do
prInfo <- catchAll $ queryPR pr_key
forM prInfo \(pull_request, pull_request_merge, author) -> do
Persist.insert_ pull_request
ensureSubscriptions pr_key author =<< getMissingAuthorSubscriptions pr_key author
case pull_request_merge of
Just merge_info -> do
Persist.insert_ merge_info
discoverReachedBranches pull_request merge_info
Nothing -> pass
branches <- reachedBranches pull_request
pure
( pull_request
, branches
)
ensureSubscriptions :: Persist.Key PullRequest -> Text -> [Text] -> App ()
ensureSubscriptions pr_key author missing_subscriptions = do
forM_ missing_subscriptions \user -> SQL.insert_ (Subscription user pr_key)
pr_msg <- mapM prHTML =<< getPRInfo pr_key
forM_ pr_msg \msg -> forM_ missing_subscriptions \user ->
sendMessageToUser user $ m ("Because you are following user " <> author <> " I subscribed you to the pull request ") <> msg
{- | This function
| 1. Looks if a commit is a known merge commit, and marks as arrived.
| 2. Sees if the commit itself looks like a merge commit for a known PR, creates a merge entry, marks as arrived and asks github if bases don‘t match.
| 3. Asks github, if we are currently looking for unmerged PRs and the commit doesn‘t seem to belong to any known PRs, then it marks as arrived, if known
| 4. If any of the before happened for a subscribed PR, return the subscriptions.
-}
findSubscribedPRsInCommitList :: Text -> [Commit] -> [Commit] -> App [Persist.Key PullRequest]
findSubscribedPRsInCommitList branch possible_new_merge_commits =
fmap join . mapM \change ->
either id id <$> runExceptT do
found_by_merge_commit <-
lift $
fmap (unMergeKey . Persist.entityKey) <$> SQL.select do
merge <- SQL.from $ SQL.table @Merge
SQL.where_ (merge ^. MergeCommit ==. SQL.val (commitId change))
pure merge
unless (null found_by_merge_commit) (Except.throwError found_by_merge_commit)
-- Branches which beginn with "nix" are channel branches and we don‘t scan those for new merge_commits.
when (Text.isPrefixOf "nix" branch) $ Except.throwError []
unless (change `elem` possible_new_merge_commits) $ Except.throwError []
lift do
owner <- getEnv (owner . repo . config)
name <- getEnv (name . repo . config)
result <- queryGraphQL GraphQL.API.MergingPullRequestQuery{GraphQL.API._commit = commitId change, _owner = owner, _name = name}
putText $ "MergingQuery: " <> show change <> " "
checkRateLimit [get|result.rateLimit!|]
prs <- mapM extractPR $ catMaybes [get|result.repository!.object!.__fragment!.associatedPullRequests!.nodes!|]
flip mapMaybeM prs \(pr, merge, author) ->
case merge of
Just mergeProof | mergeCommit mergeProof == commitId change -> do
let pr_key = mergeNumber mergeProof
missing_subs <- getMissingAuthorSubscriptions pr_key author
pr_is_watched <- isJust <$> Persist.get (mergeNumber mergeProof)
if pr_is_watched || not (null missing_subs)
then do
Persist.repsert pr_key pr
Persist.repsert (MergeKey pr_key) mergeProof
ensureSubscriptions pr_key author missing_subs
pure $ Just pr_key
else pure Nothing
_ -> pure Nothing
notifySubscribers :: Text -> [Persist.Key PullRequest] -> App [Subscription]
notifySubscribers branch =
fmap join . mapM \pr -> do
subscriptions <-
fmap Persist.entityVal <$> SQL.select do
sub <- SQL.from $ SQL.table @Subscription
SQL.where_ (sub ^. SubscriptionPullRequest ==. SQL.val pr)
pure sub
unless (null subscriptions) $ Persist.insert_ (Arrival pr (BranchKey branch))
pure subscriptions
watchRepo :: App ()
watchRepo = do
conf <- getEnv config
Process.runProcess_ (git conf $ "fetch" : "-q" : "origin" : fmap toString (Map.keys $ branches conf))
messages <-
catMaybes <$> do
forM (Map.toList $ branches conf) \(branch, next) -> do
[new_commit] <- gitShow [originBranch branch]
let key = BranchKey branch
old_branch_state :: Maybe Branch <- Persist.get key
Persist.repsert key $ Branch branch (commitId new_commit)
case old_branch_state of
Just (Branch{branchCommit = old_commit}) -> do
let diffQuery = [toString $ old_commit <> "..." <> commitId new_commit, "--not"] <> fmap originBranch next
-- This is number of new commits the github UI will show and the user will expect to see.
changes <- gitShow diffQuery
-- These are the commits, that are actually direct successors of
-- the previous branch head and therefor the only ones that can be merge commits.
possible_new_merge_requests <- gitShow $ "--ancestry-path" : diffQuery
prs <- notifySubscribers branch =<< findSubscribedPRsInCommitList branch possible_new_merge_requests changes
if null changes
then pure Nothing
else
Just . (,prs) . fold
<$> sequence
[ branchHTML branch
, pure $ m " advanced by "
, repoLink ("compare/" <> old_commit <> "..." <> commitId new_commit) (show (length changes) <> " commits")
, pure $ m " to "
, commitHTML new_commit
]
Nothing -> do
putTextLn . (("Initiated database for branch " <> branch <> " at ") <>) . fst =<< commitHTML new_commit
pure Nothing
forM_ messages $ \(msg, subscriptions) -> forM_ (NonEmpty.groupAllWith subscriptionUser subscriptions) \subscriptionsByUser -> do
let author = subscriptionUser $ head subscriptionsByUser
prs = toList $ subscriptionPullRequest <$> subscriptionsByUser
prMsgs <- sequence =<< mapMaybeM (fmap (fmap prHTML) . getPRInfo) prs
sendMessageToUser author $ unlinesMsg $ msg : m ("Including these " <> show (length prMsgs) <> " pull requests you subscribed to:") : prMsgs
unsubscribeFromFinishedPRs
-- Run some maintenance daily
whenTimeIsUp lastMaintenance (60 * 60 * 24) maintenance
maintenance :: App ()
maintenance = do
dropUnsubscribedPRs
dropOldBranches
deleteUnusedQueries
leaveEmptyRooms
dropOldBranches :: App ()
dropOldBranches = do
branches <- getEnv (Map.keys . branches . config)
SQL.delete do
branch <- SQL.from $ SQL.table @Branch
SQL.where_ (branch ^. BranchName `notIn` SQL.valList branches)
dropUnsubscribedPRs :: App ()
dropUnsubscribedPRs = do
SQL.delete do
pr <- SQL.from $ SQL.table @PullRequest
SQL.where_ $
(pr ^. PullRequestId) `notIn` SQL.subList_select do
sub <- SQL.from $ SQL.table @Subscription
pure (sub ^. SubscriptionPullRequest)
unsubscribeFromFinishedPRs :: App ()
unsubscribeFromFinishedPRs = do
prs <- SQL.select $ SQL.from $ SQL.table @PullRequest
forM_ prs $ \pr -> do
all_reached <- all fst <$> reachedBranches (SQL.entityVal pr)
when all_reached do
subs <- SQL.select do
sub <- SQL.from $ SQL.table @Subscription
SQL.where_ (sub ^. SubscriptionPullRequest ==. SQL.val (SQL.entityKey pr))
pure sub
forM_ subs \sub -> do
pr_html <- prHTML (SQL.entityVal pr, [])
sendMessageToUser (subscriptionUser (Persist.entityVal sub)) $ m "Your subscription of pr " <> pr_html <> m " has ended, because it reached all relevant branches."
SQL.delete do
pr_ <- SQL.from $ SQL.table @PullRequest
SQL.where_ (pr_ ^. PullRequestId ==. SQL.val (SQL.entityKey pr))
deleteUnusedQueries :: App ()
deleteUnusedQueries = SQL.delete do
query <- SQL.from $ SQL.table @Query
SQL.where_ $
(query ^. QueryUser) `notIn` SQL.subList_select do
sub <- SQL.from $ SQL.table @Subscription
pure (sub ^. SubscriptionUser)
&&. (query ^. QueryUser) `notIn` SQL.subList_select do
sub <- SQL.from $ SQL.table @AuthorSubscription
pure (sub ^. AuthorSubscriptionUser)
leaveEmptyRooms :: App ()
leaveEmptyRooms = do
session <- getEnv matrixSession
rooms <- unwrapMatrixError (Matrix.getJoinedRooms session)
forM_ rooms \room ->
whenM ((== 1) . length <$> unwrapMatrixError (Matrix.getRoomMembers session room)) $ unwrapMatrixError $ Matrix.leaveRoomById session room
sendMessage :: Matrix.RoomID -> MessageText -> App ()
sendMessage roomId@(Matrix.RoomID roomIdText) message = do
putTextLn $ "in room" <> roomIdText <> ":\n" <> fst message
txnId <- Matrix.TxnID . show <$> Random.randomRIO (1000000 :: Int, 9999999)
session <- getEnv matrixSession
void $
unwrapMatrixError $
Matrix.sendMessage
session
roomId
(Matrix.EventRoomMessage $ Matrix.RoomMessageText $ Matrix.MessageText (fst message) Matrix.NoticeType (Just "org.matrix.custom.html") (Just (snd message)))
txnId
sendMessageToUser :: Text -> MessageText -> App ()
sendMessageToUser user message = do
userQuery <- Persist.get (QueryKey user)
case userQuery of
Just queryPair -> do
putText $ "To user " <> user <> " "
sendMessage (Matrix.RoomID $ queryRoom queryPair) message
Nothing -> putTextLn $ "Not finding a query for " <> user <> " can‘t send message: " <> fst message
data Command = MkCommand
{ roomId :: Matrix.RoomID
, command :: Text
, args :: Text
, author :: Text
, isQuery :: Bool
}
getCommands :: Matrix.RoomID -> NonEmpty Matrix.RoomEvent -> App [Command]
getCommands roomId events = do
maybe [] toList <$> forM (nonEmpty $ mapMaybe getCommand $ toList events) \messages -> do
session <- getEnv matrixSession
members <- unwrapMatrixError $ Matrix.getRoomMembers session roomId
let isQuery = Map.size members <= 2
forM (toList messages) \(author, message) -> do
let (cmd, args) = second (Text.drop 1) $ Text.breakOn " " $ Text.strip message
pure $ MkCommand{command = Text.toLower cmd, args, author, isQuery, roomId}
where
getCommand Matrix.RoomEvent{Matrix.reSender = Matrix.Author author, Matrix.reContent = Matrix.EventRoomMessage (Matrix.RoomMessageText (Matrix.MessageText{Matrix.mtBody, Matrix.mtType = Matrix.TextType}))} = Just (author, mtBody)
getCommand _ = Nothing
recordInvites :: Maybe Matrix.SyncResultRoom -> App ()
recordInvites (Just (Matrix.SyncResultRoom{Matrix.srrInvite = Just invites})) = do
now <- liftIO Time.getCurrentTime
forM_ (Map.keys invites) \room -> SQL.insert $ Invite room now 0
recordInvites _ = pass
joinInvites :: App ()
joinInvites = do
session <- getEnv matrixSession
now <- liftIO Time.getCurrentTime
dueInvites <-
fmap SQL.entityVal <$> SQL.select do
invite <- SQL.from $ SQL.table @Invite
SQL.where_ (invite ^. InviteAt <. SQL.val now)
pure invite
forM_ dueInvites \Invite{inviteRoom, inviteAt, inviteTries} -> do
joinAttempt <- liftIO $ Matrix.joinRoom session inviteRoom
let delete = Persist.delete (InviteKey inviteRoom)
retry_in = toEnum (2 ^ inviteTries)
num_retries = 16
case joinAttempt of
Right _ -> do
delete
let roomId = Matrix.RoomID inviteRoom
members <- unwrapMatrixError $ Matrix.getRoomMembers session roomId
let isQuery = Map.size members <= 2
when isQuery $ sendMessage roomId =<< helpMessage
-- less than roughly a day
Left _ | inviteTries < num_retries -> do
putTextLn $ "Failed to join room " <> inviteRoom <> " retrying in " <> show retry_in <> " seconds."
Persist.repsert (InviteKey inviteRoom) (Invite inviteRoom (Time.addUTCTime retry_in inviteAt) (inviteTries + 1))
Left _ -> do
putTextLn $ "Failed to join room " <> inviteRoom <> " " <> show num_retries <> " times. Giving up."
delete
saveNextBatch :: Text -> App ()
saveNextBatch next_batch = Persist.repsert (SessionStateKey' "next_batch") (SessionState "next_batch" next_batch)
setQueries :: [Command] -> App ()
setQueries commands = do
forM_ (filter isQuery commands) \command -> do
current_query <- Persist.get (QueryKey (author command))
let set_room = void $ Persist.repsert (QueryKey (author command)) (Query (author command) (coerce $ roomId command))
case current_query of
Just query
| queryRoom query == coerce (roomId command) -> pass
| otherwise -> do
set_room
sendMessageToUser (author command) $ m "Because you sent your most recent message to this room, I will use this room for direct messages to you from now on."
_ -> do
putTextLn $ "Setting Query for user " <> author command <> " to " <> coerce (roomId command)
set_room
parsePRNumber :: Text -> Maybe Int
parsePRNumber = readMaybe . toString . Text.dropWhile (`notElem` ['0' .. '9'])
resultHandler :: Matrix.SyncResult -> App ()
resultHandler syncResult@Matrix.SyncResult{Matrix.srNextBatch, Matrix.srRooms} = do
saveNextBatch srNextBatch
recordInvites srRooms
joinInvites
commands <- join <$> mapM (uncurry getCommands) (Matrix.getTimelines syncResult)
setQueries commands
let hasSub author pr_key =
null <$> SQL.select do
sub <- SQL.from $ SQL.table @Subscription
SQL.where_ (sub ^. SubscriptionUser ==. SQL.val author &&. sub ^. SubscriptionPullRequest ==. SQL.val pr_key)
pure sub
hasAuthorSub user author =
null <$> SQL.select do
sub <- SQL.from $ SQL.table @AuthorSubscription
SQL.where_ (sub ^. AuthorSubscriptionUser ==. SQL.val user &&. sub ^. AuthorSubscriptionGithubLogin ==. SQL.val author)
pure sub
responses <- forM (filter isQuery commands) \cmd ->
(cmd,) <$> catchAll case cmd of
MkCommand{command, author, args}
| Text.isPrefixOf command "subscribe"
, split_args <- Text.words args
, fromMaybe False (viaNonEmpty (flip Text.isPrefixOf "user" . head) split_args) -> do
case maybeAt 1 split_args of
Nothing -> pure $ m "Please tell me a user to subscribe to."
Just user -> do
notSubbed <- hasAuthorSub author user
if notSubbed
then do
Persist.insert_ $ AuthorSubscription author user
pure $ m $ "I will now track for you all pull requests by " <> user
else pure $ m $ "Okay, but you were already subscribed to pull requests by user " <> user
MkCommand{command, author, args}
| Text.isPrefixOf command "unsubscribe"
, split_args <- Text.words args
, fromMaybe False (viaNonEmpty (flip Text.isPrefixOf "user" . head) split_args) -> do
case maybeAt 1 split_args of
Nothing -> pure $ m "Please tell me a user to unsubscribe from."
Just user -> do
notSubbed <- hasAuthorSub author user
if notSubbed
then pure $ m $ "I haven‘t been tracking pull requests by " <> user <> " for you."
else do
SQL.delete $ do
author_sub <- SQL.from $ SQL.table @AuthorSubscription
SQL.where_ (author_sub ^. AuthorSubscriptionUser ==. SQL.val author &&. author_sub ^. AuthorSubscriptionGithubLogin ==. SQL.val user)
pure $ m $ "I will not subscribe you automatically to new pull requests by user " <> user <> " anymore."
MkCommand{command, author, args} | Text.isPrefixOf command "subscribe" ->
case parsePRNumber args of
Nothing -> pure $ m $ "I could not parse \"" <> args <> "\" as a pull request number. Have you maybe mistyped it?"
Just number -> do
let pr_key = PullRequestKey number
pr_msg_may <- mapM prHTML =<< getPRInfo pr_key
notSubbed <- hasSub author pr_key
case pr_msg_may of
Just prMsg | notSubbed -> do
Persist.insert_ $ Subscription author pr_key
pure $ m "I will now track for you the pull request " <> prMsg
Just prMsg -> pure $ m "Okay, but you were already subscribed to pull request " <> prMsg
Nothing -> pure $ m $ "Can‘t find information about a pull request with number #" <> show number <> "."
MkCommand{command, author, args} | Text.isPrefixOf command "unsubscribe" ->
case parsePRNumber args of
Nothing -> pure $ m $ "I could not parse \"" <> args <> "\" as a pull request number. Have you maybe mistyped it?"
Just number -> do
let pr_key = PullRequestKey number
pr_msg_may <- mapM prHTML =<< getPRInfo pr_key
notSubbed <- hasSub author pr_key
case pr_msg_may of
Just prMsg
| notSubbed ->
pure $ m "Well, you were not subscribed to pull request " <> prMsg
Just prMsg -> do
Persist.delete $ SubscriptionKey author pr_key
pure $ m "Okay, I will not send you updates about pull request " <> prMsg
Nothing -> pure $ m $ "Can‘t find information about a pull request with number #" <> show number <> "."
MkCommand{command, author} | Text.isPrefixOf command "list" -> do
existingSubscriptions <- SQL.select $ do
sub <- SQL.from $ SQL.table @Subscription
SQL.where_ (sub ^. SubscriptionUser ==. SQL.val author)
pure sub
existingAuthorSubscriptions <- SQL.select $ do
sub <- SQL.from $ SQL.table @AuthorSubscription
SQL.where_ (sub ^. AuthorSubscriptionUser ==. SQL.val author)
pure sub
if null existingSubscriptions && null existingAuthorSubscriptions
then do
pure $ m "I am currently not tracking any pull requests or users for you. Use " <> codeHTML "subscribe" <> m " to change that."
else do
prMsgs <- sequence =<< mapMaybeM (fmap (fmap prHTML) . getPRInfo . subscriptionPullRequest . Persist.entityVal) existingSubscriptions
pure $ unlinesMsg (m ("I am currently watching the following " <> show (length existingSubscriptions) <> " pull requests for you:") : prMsgs <> [m ("Also I am subscribing you to new pull requests by the users: " <> Text.intercalate ", " (fmap (authorSubscriptionGithubLogin . Persist.entityVal) existingAuthorSubscriptions))])
MkCommand{command} | Text.isPrefixOf command "help" -> helpMessage
MkCommand{command} -> pure (unlinesMsg [m "Sorry, I don‘t know what you want from me, when your command starts with: " <> codeHTML command, m "I‘ll tell you all commands I know, when you use the " <> codeHTML "help" <> m " command."])
forM_ responses $ uncurry \MkCommand{author} -> sendMessageToUser author . fromMaybe (m "Your command triggered an internal error in the bot. Sorry about that.")
whenTimeIsUp lastWatch 60 watchRepo
helpMessage :: App MessageText
helpMessage = do
branchList <- join $ getEnv (fmap (intercalateMsgPlain ", ") . mapM branchHTML . Map.keys . branches . config)
repo_link <- repoLink "" "nixpkgs git repository on github"
pure $
unlinesMsg
[ m "Hey! I am the friendly nixpkgs-bot and I am here to help you notice when pull requests are being merged, so you don‘t need to hammer refresh on github."
, mempty
, m "I am continously watching the " <> repo_link <> m ". If you want to be notified whenever a PR reaches one of the relevant branches in the nixpkgs release cycle, you can tell me via the following commands:"
, mempty
, codeHTML "subscribe [pr-number]" <> m ": I will subscribe you to the given pull request."
, codeHTML "unsubscribe [pr-number]" <> m ": I will unsubscribe you from the given pull request."
, codeHTML "subscribe user [github-login-name]" <> m ": I will subscribe you to all newly merged pull requests created by the given github handle."
, codeHTML "unsubscribe user [github-login-name]" <> m ": I will not subscribe you to newly merged pull requests from the given user anymore."
, codeHTML "list" <> m ": I will show you all the pull requests, I am watching for you."
, codeHTML "help" <> m ": So I can tell you all of this again."
, mempty
, m "By the way, you don‘t need to type the whole command, for every keyword in the command any prefix will work. e.g. " <> codeHTML "s u" <> m " for " <> codeHTML "subscribe user"
, mempty
, m "I will inform you, when one of the pull requests you subscribed to reaches one of these branches: " <> branchList
, mempty
, m "I have been programmed and am being hosted by " <> mention "@maralorn:maralorn.de" <> m ". Feel free to reach out to him, if you have any problems or suggestions."
, m "My code is written in Haskell, is open source under the AGPL license and can be found at " <> link "https://git.maralorn.de/nixpkgs-bot" "git.maralorn.de/nixpkgs-bot" <> m "."
]
whenTimeIsUp :: (Environment -> IORef Clock.TimeSpec) -> Int64 -> App () -> App ()
whenTimeIsUp get_ref interval action = do
last_run_ref <- getEnv get_ref
last_run <- readIORef last_run_ref
now <- liftIO $ Clock.getTime Clock.Monotonic
when (Clock.sec (Clock.diffTimeSpec now last_run) > interval) do
writeIORef last_run_ref now
action
codeHTML :: (Semigroup b, IsString b) => b -> (b, b)
codeHTML label = (label, "<code>" <> label <> "</code>")
main :: IO ()
main = do
hSetBuffering stdout LineBuffering
hSetBuffering stderr LineBuffering
[config_path] <- getArgs
config <- Yaml.decodeFileThrow config_path
matrix_token <- loadCredential "matrix_token"
matrix_session <- Matrix.createSession (server config) (Matrix.MatrixToken matrix_token)
github_token <- loadCredential "github_token"
now <- liftIO $ Clock.getTime Clock.Monotonic
last_watch <- newIORef now
last_maintenance <- newIORef minBound
let runApp :: App a -> IO a
runApp = flip runReaderT (MkEnvironment config matrix_session github_token last_watch last_maintenance) . Persist.Sqlite.runSqlite (database config) . Persist.Sqlite.retryOnBusy
first_next_batch <- runApp do
Persist.Sqlite.runMigration migrateAll
watchRepo
fmap sessionStateValue <$> Persist.get (SessionStateKey' "next_batch")
userId <- unwrapMatrixError $ Matrix.getTokenOwner matrix_session
filterId <- unwrapMatrixError $ Matrix.createFilter matrix_session userId Matrix.messageFilter
unwrapMatrixError $ Matrix.syncPoll matrix_session (Just filterId) first_next_batch (Just Matrix.Online) (void . catchAll . runApp . resultHandler)
catchAll :: (MonadIO m, MonadCatch.MonadCatch m) => m a -> m (Maybe a)
catchAll action = MonadCatch.catch (Just <$> action) (\(e :: SomeException) -> putStrLn ("### ERROR ###: " <> displayException e) >> pure Nothing)

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{
"nodes": {
"flake-compat": {
"flake": false,
"locked": {
"lastModified": 1650374568,
"narHash": "sha256-Z+s0J8/r907g149rllvwhb4pKi8Wam5ij0st8PwAh+E=",
"owner": "edolstra",
"repo": "flake-compat",
"rev": "b4a34015c698c7793d592d66adbab377907a2be8",
"type": "github"
},
"original": {
"owner": "edolstra",
"repo": "flake-compat",
"type": "github"
}
},
"flake-utils": {
"locked": {
"lastModified": 1667395993,
"narHash": "sha256-nuEHfE/LcWyuSWnS8t12N1wc105Qtau+/OdUAjtQ0rA=",
"owner": "numtide",
"repo": "flake-utils",
"rev": "5aed5285a952e0b949eb3ba02c12fa4fcfef535f",
"type": "github"
},
"original": {
"id": "flake-utils",
"type": "indirect"
}
},
"nixpkgs": {
"locked": {
"lastModified": 1667639549,
"narHash": "sha256-frqZKSG/933Ctwl9voSZnXDwo8CqddXcjQhnCzwNqaM=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "cae3751e9f74eea29c573d6c2f14523f41c2821a",
"type": "github"
},
"original": {
"id": "nixpkgs",
"type": "indirect"
}
},
"pre-commit-hooks": {
"inputs": {
"flake-utils": [
"flake-utils"
],
"nixpkgs": [
"nixpkgs"
]
},
"locked": {
"lastModified": 1667680128,
"narHash": "sha256-bnXYCDzkviKNeYwnh3YW2HpgSgUMnSGVsTtHNLXBXfE=",
"owner": "cachix",
"repo": "pre-commit-hooks.nix",
"rev": "b84548575a627cad3e0b31b2c2b64eb7774c24db",
"type": "github"
},
"original": {
"owner": "cachix",
"repo": "pre-commit-hooks.nix",
"type": "github"
}
},
"root": {
"inputs": {
"flake-compat": "flake-compat",
"flake-utils": "flake-utils",
"nixpkgs": "nixpkgs",
"pre-commit-hooks": "pre-commit-hooks"
}
}
},
"root": "root",
"version": 7
}

83
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{
description = "nixpkgs-bot";
inputs = {
pre-commit-hooks = {
url = "github:cachix/pre-commit-hooks.nix";
inputs = {
flake-utils.follows = "flake-utils";
nixpkgs.follows = "nixpkgs";
};
};
flake-compat = {
url = "github:edolstra/flake-compat";
flake = false;
};
};
outputs = {
self,
nixpkgs,
flake-utils,
pre-commit-hooks,
...
}:
flake-utils.lib.eachSystem ["x86_64-linux"] (
system: let
ghc-version = "90";
inherit (nixpkgs.legacyPackages.${system}) lib haskell pkgs;
hlib = haskell.lib.compose;
inherit (hlib) doJailbreak dontCheck markUnbroken appendPatch;
haskellPackages = haskell.packages."ghc${ghc-version}".override {
overrides = final: prev: {
matrix-client =
appendPatch (pkgs.fetchpatch {
url = "https://github.com/softwarefactory-project/matrix-client-haskell/commit/97cb1918fcdf9b0249c6c8e70c7bfc664d718022.patch";
sha256 = "sha256-YyxgfNO5RtqpKJ9UOYPlRple0FuNmjAB1iy9vYy0HOE=";
relative = "matrix-client";
})
prev.matrix-client;
aeson-schemas = markUnbroken (dontCheck prev.aeson-schemas);
};
};
cleanSelf = lib.sourceFilesBySuffices self [
".hs"
".cabal"
"LICENSE"
"CHANGELOG.md"
];
in rec {
packages = {
default =
lib.pipe {}
[
(haskellPackages.callCabal2nix "nixpkgs-bot" cleanSelf)
haskellPackages.buildFromCabalSdist
hlib.justStaticExecutables
];
};
checks = {
pre-commit-check = pre-commit-hooks.lib.${system}.run {
src = ./.;
hooks = {
alejandra.enable = true;
statix.enable = true;
cabal-fmt.enable = true;
shellcheck.enable = true;
fourmolu.enable = true;
};
};
};
devShells.default = haskellPackages.shellFor {
packages = _: [packages.default];
buildInputs = [
pre-commit-hooks.defaultPackage.${system}
haskellPackages.haskell-language-server
haskellPackages.weeder
pkgs.haskellPackages.cabal-install
pkgs.sqlite
];
withHoogle = true;
inherit (self.checks.${system}.pre-commit-check) shellHook;
};
}
);
}

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indentation: 2

26
apps/nixpkgs-bot/graphql/merge_pr_info.graphql Normal file
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query MergingPullRequest($commit: GitObjectID!, $owner: String!, $name: String!) {
repository(owner: $owner, name: $name) {
object(oid: $commit) {
... on Commit {
associatedPullRequests(first: 10) {
nodes {
number
title
mergeCommit {
oid
}
author {
login
}
merged
baseRefName
}
}
}
}
}
rateLimit {
remaining
resetAt
}
}

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apps/nixpkgs-bot/graphql/pr_info.graphql Normal file
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query PullRequest($number: Int!, $owner: String!, $name: String!) {
repository(owner: $owner, name: $name) {
pullRequest(number: $number) {
number
title
mergeCommit {
oid
}
author {
login
}
merged
baseRefName
}
}
rateLimit {
remaining
resetAt
}
}

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{- This file was automatically generated and should not be edited. -}
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DuplicateRecordFields #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE QuasiQuotes #-}
{-# LANGUAGE TypeFamilies #-}
{-# OPTIONS_GHC -w #-}
module NixpkgsBot.GraphQL.API where
import Data.GraphQL
import Data.GraphQL.Bootstrap
import NixpkgsBot.GraphQL.Scalars
{-----------------------------------------------------------------------------
* MergingPullRequest
-- result :: Object MergingPullRequestSchema; throws a GraphQL exception on errors
result <- runQuery MergingPullRequestQuery
{ _commit = ...
, _owner = ...
, _name = ...
}
-- result :: GraphQLResult (Object MergingPullRequestSchema)
result <- runQuerySafe MergingPullRequestQuery
{ _commit = ...
, _owner = ...
, _name = ...
}
-----------------------------------------------------------------------------}
data MergingPullRequestQuery = MergingPullRequestQuery
{ _commit :: GitObjectID
, _owner :: Text
, _name :: Text
}
deriving (Show)
type MergingPullRequestSchema =
[schema|
{
repository: Maybe {
object: Maybe {
[__fragment]: Try (
{
associatedPullRequests: Maybe {
nodes: Maybe List Maybe {
number: Int,
title: Text,
mergeCommit: Maybe {
oid: GitObjectID,
},
author: Maybe {
login: Text,
},
merged: Bool,
baseRefName: Text,
},
},
}
),
},
},
rateLimit: Maybe {
remaining: Int,
resetAt: DateTime,
},
}
|]
instance GraphQLQuery MergingPullRequestQuery where
type ResultSchema MergingPullRequestQuery = MergingPullRequestSchema
getQueryName _ = "MergingPullRequest"
getQueryText _ =
[query|
query MergingPullRequest($commit: GitObjectID!, $owner: String!, $name: String!) {
repository(owner: $owner, name: $name) {
object(oid: $commit) {
... on Commit {
associatedPullRequests(first: 10) {
nodes {
number
title
mergeCommit {
oid
}
author {
login
}
merged
baseRefName
}
}
}
}
}
rateLimit {
remaining
resetAt
}
}
|]
getArgs query =
object
[ "commit" .= _commit (query :: MergingPullRequestQuery)
, "owner" .= _owner (query :: MergingPullRequestQuery)
, "name" .= _name (query :: MergingPullRequestQuery)
]
{-----------------------------------------------------------------------------
* PullRequest
-- result :: Object PullRequestSchema; throws a GraphQL exception on errors
result <- runQuery PullRequestQuery
{ _number = ...
, _owner = ...
, _name = ...
}
-- result :: GraphQLResult (Object PullRequestSchema)
result <- runQuerySafe PullRequestQuery
{ _number = ...
, _owner = ...
, _name = ...
}
-----------------------------------------------------------------------------}
data PullRequestQuery = PullRequestQuery
{ _number :: Int
, _owner :: Text
, _name :: Text
}
deriving (Show)
type PullRequestSchema =
[schema|
{
repository: Maybe {
pullRequest: Maybe {
number: Int,
title: Text,
mergeCommit: Maybe {
oid: GitObjectID,
},
author: Maybe {
login: Text,
},
merged: Bool,
baseRefName: Text,
},
},
rateLimit: Maybe {
remaining: Int,
resetAt: DateTime,
},
}
|]
instance GraphQLQuery PullRequestQuery where
type ResultSchema PullRequestQuery = PullRequestSchema
getQueryName _ = "PullRequest"
getQueryText _ =
[query|
query PullRequest($number: Int!, $owner: String!, $name: String!) {
repository(owner: $owner, name: $name) {
pullRequest(number: $number) {
number
title
mergeCommit {
oid
}
author {
login
}
merged
baseRefName
}
}
rateLimit {
remaining
resetAt
}
}
|]
getArgs query =
object
[ "number" .= _number (query :: PullRequestQuery)
, "owner" .= _owner (query :: PullRequestQuery)
, "name" .= _name (query :: PullRequestQuery)
]

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module NixpkgsBot.GraphQL.Scalars (DateTime, GitObjectID, module Relude) where
import Data.Time.Clock
import Relude
type DateTime = UTCTime
type GitObjectID = Text

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cabal-version: 3.0
name: nixpkgs-bot
version: 0.1.0.0
synopsis:
A matrix bot which watches nixpkgs and informs about PR progress.
homepage: https://git.maralorn.de/nixpkgs-bot
license: AGPL-3.0-or-later
license-file: LICENSE
author: maralorn
maintainer: mail@maralorn.de
build-type: Simple
extra-doc-files: CHANGELOG.md
common common-config
ghc-options: -Wall
default-extensions:
NoImplicitPrelude
BlockArguments
DataKinds
DeriveAnyClass
DeriveGeneric
DerivingStrategies
DuplicateRecordFields
FlexibleContexts
FlexibleInstances
GADTs
GeneralizedNewtypeDeriving
LambdaCase
MultiParamTypeClasses
NamedFieldPuns
OverloadedStrings
QuasiQuotes
ScopedTypeVariables
StandaloneDeriving
TemplateHaskell
TupleSections
TypeApplications
TypeFamilies
UndecidableInstances
build-depends:
, aeson-schemas
, async
, base >=4.15 && <5
, clock
, containers
, esqueleto
, exceptions
, graphql-client
, http-client
, matrix-client
, monad-logger
, mtl
, persistent
, persistent-sqlite
, random
, relude
, resourcet
, time
, typed-process
, yaml
default-language: Haskell2010
library
import: common-config
exposed-modules:
NixpkgsBot.GraphQL.API
NixpkgsBot.GraphQL.Scalars
hs-source-dirs: lib
executable nixpkgs-bot
import: common-config
main-is: Main.hs
hs-source-dirs: exe
ghc-options: -threaded
build-depends: nixpkgs-bot

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