| 122 | } |
| 123 | |
| 124 | const onReadable = function () { |
| 125 | // read waiting data from the socket |
| 126 | // e.g. clear the pending 'select' |
| 127 | if (!pq.consumeInput()) { |
| 128 | return readError() |
| 129 | } |
| 130 | |
| 131 | // check if there is still outstanding data |
| 132 | // if so, wait for it all to come in |
| 133 | if (pq.isBusy()) { |
| 134 | return |
| 135 | } |
| 136 | |
| 137 | // load our result object |
| 138 | pq.getResult() |
| 139 | |
| 140 | // "read until results return null" |
| 141 | // or in our case ensure we only have one result |
| 142 | if (pq.getResult() && pq.resultStatus() !== 'PGRES_COPY_OUT') { |
| 143 | return readError('Only one result at a time is accepted') |
| 144 | } |
| 145 | |
| 146 | if (pq.resultStatus() === 'PGRES_FATAL_ERROR') { |
| 147 | return readError() |
| 148 | } |
| 149 | |
| 150 | cleanup() |
| 151 | return cb(null) |
| 152 | } |
| 153 | pq.on('readable', onReadable) |
| 154 | pq.startReader() |
| 155 | } |