mirror of https://github.com/waku-org/nwaku.git
106 lines
2.6 KiB
Nim
106 lines
2.6 KiB
Nim
when (NimMajor, NimMinor) < (1, 4):
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{.push raises: [Defect,DbError].}
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else:
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{.push raises: [ValueError,DbError].}
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import
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stew/results,
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chronos
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include db_postgres
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## Connection management
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proc check*(db: DbConn): Result[void, string] =
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var message: string
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try:
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message = $db.pqErrorMessage()
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except ValueError,DbError:
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return err("exception in check: " & getCurrentExceptionMsg())
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if message.len > 0:
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return err($message)
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return ok()
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proc open*(connString: string):
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Result[DbConn, string] =
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## Opens a new connection.
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var conn: DbConn = nil
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try:
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conn = open("","", "", connString)
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except DbError:
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return err("exception opening new connection: " &
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getCurrentExceptionMsg())
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if conn.status != CONNECTION_OK:
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let checkRes = conn.check()
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if checkRes.isErr():
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return err("failed to connect to database: " & checkRes.error)
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return err("unknown reason")
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ok(conn)
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proc rows*(db: DbConn,
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query: SqlQuery,
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args: seq[string]):
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Future[Result[seq[Row], string]] {.async.} =
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## Runs the SQL getting results.
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if db.status != CONNECTION_OK:
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let checkRes = db.check()
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if checkRes.isErr():
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return err("failed to connect to database: " & checkRes.error)
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return err("unknown reason")
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var wellFormedQuery = ""
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try:
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wellFormedQuery = dbFormat(query, args)
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except DbError:
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return err("exception formatting the query: " &
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getCurrentExceptionMsg())
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let success = db.pqsendQuery(cstring(wellFormedQuery))
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if success != 1:
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let checkRes = db.check()
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if checkRes.isErr():
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return err("failed pqsendQuery: " & checkRes.error)
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return err("failed pqsendQuery: unknown reason")
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var ret = newSeq[Row](0)
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while true:
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let success = db.pqconsumeInput()
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if success != 1:
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let checkRes = db.check()
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if checkRes.isErr():
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return err("failed pqconsumeInput: " & checkRes.error)
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return err("failed pqconsumeInput: unknown reason")
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if db.pqisBusy() == 1:
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await sleepAsync(0.milliseconds) # Do not block the async runtime
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continue
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var pqResult = db.pqgetResult()
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if pqResult == nil:
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# Check if its a real error or just end of results
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let checkRes = db.check()
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if checkRes.isErr():
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return err("error in rows: " & checkRes.error)
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return ok(ret) # reached the end of the results
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var cols = pqResult.pqnfields()
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var row = cols.newRow()
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for i in 0'i32 .. pqResult.pqNtuples() - 1:
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pqResult.setRow(row, i, cols) # puts the value in the row
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ret.add(row)
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pqclear(pqResult)
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