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JdbcToCouchDbBulk.kt
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JdbcToCouchDbBulk.kt
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package com.fnreport
import com.fasterxml.jackson.databind.ObjectMapper
import com.fasterxml.jackson.databind.PropertyNamingStrategy
import org.intellij.lang.annotations.Language
import java.io.IOException
import java.lang.System.err
import java.lang.System.exit
import java.net.HttpURLConnection
import java.net.URL
import java.sql.ResultSet
import java.text.SimpleDateFormat
import kotlin.system.exitProcess
import kotlin.text.Charsets.UTF_8
object JdbcToCouchDbBulk {
val configs = listOf(
EnvConfig("FETCHSIZE", docString = "number of rows to fetch from jdbc"),
EnvConfig("BULKSIZE", "500", docString = "number of rows to write in bulk"),
EnvConfig("BATCHMODE", docString = "ifnotnull"),
EnvConfig("TERSE", "false", docString = "if not blank, this will write 1 array per record after potential record '_id' and will create a view to decorate the values as an object."),
EnvConfig("SCHEMAPATTERN"),
EnvConfig("CATALOG"),
EnvConfig("TABLENAMEPATTERN", null, "NULL is permitted, but pattern may include '%' also"),
EnvConfig("TYPES", """["TABLE"]""", """array: Typical types are "TABLE", "VIEW", "SYSTEM TABLE", "GLOBAL TEMPORARY", "LOCAL TEMPORARY", "ALIAS", "SYNONYM" """)
).map { it.name to it }.toMap()
fun go(args: Array<out String>) {
if ("--help" in args || args.size < 2) {
printOptions()
}
val (connection, dbMeta) = connectToJdbcUrl(jdbcUrl = args[1])
val (fetchSize,
catalogg,
schemaa,
tablenamePattern,
typesConfig
) = arrayOf("FETCHSIZE", "CATALOG", "SCHEMAPATTERN", "TABLENAMEPATTERN", "TYPES").map { configs.get(it)!! }.map(EnvConfig::value)
fetchSize?.run { err.println("setting fetchsize to: " + fetchSize) }
val terse = configs["TERSE"]!!.value?.toBoolean() ?: false
val bulkSize = configs["BULKSIZE"]!!.value!!.toInt()
val couchprefix = args[0]
listOf(catalogg, schemaa, tablenamePattern).let { (cname, sname, tpat) ->
val typs = typesConfig?.let { objectMapper.readValue(it, Array<String>::class.java) }
val catalogResultSet = dbMeta.getTables(cname, sname, tpat, typs)
err.println(catalogResultSet.metaData.jdbcColumnNames.toString())
val catalogRows = catalogResultSet.jdbcRows(catalogResultSet.metaData.jdbcColumnNames)
catalogRows.map(dbMeta::jdbcEntity).forEach { e ->
val statement = connection.createStatement()
if (statement.execute("select count(*) from ${e.tname}")) {
val rowCount = statement.resultSet?.takeIf(ResultSet::next)?.getLong(1) ?: 0
if (rowCount > 0) {
fetchSize?.run { statement.fetchSize = fetchSize.toInt() }
with(statement) {
execute("select * from ${e.tname}")
with(resultSet) {
val columnNameArray by lazy { metaData.jdbcColumnNames }
val viewHeader by lazy {
val id = e.pkColumnIndexes.takeUnless(List<Int>::isEmpty)?.let {
try {
"${json(e.pkColumnIndexes.map { i -> columnNameArray[i - 1] })}"
} catch (e: IndexOutOfBoundsException) {
e.printStackTrace()
}
} ?: "auto"
"for tname: ${e.tname} rows: $rowCount, pkeys: ${e.pkColumnIndexes.size}/${e.pkColumnIndexes.toList()} columns: $columnNameArray id: $id"
}
err.println("$viewHeader")
val couchTable = couchprefix + e.tname.toLowerCase()
var couchConn = URL(couchTable).openConnection() as HttpURLConnection
couchConn.requestMethod = "PUT"
couchConn.setRequestProperty("Content-Type", "application/json")
couchConn.doOutput = true
couchConn.outputStream.write("".toByteArray())
err.println(couchTable + ": " + couchConn.responseCode to couchConn.responseMessage)
couchConn.disconnect()
if (terse) {
couchConn = URL(couchTable).openConnection() as HttpURLConnection
couchConn.requestMethod = "POST"
couchConn.setRequestProperty("Content-Type", "application/json")
couchConn.doOutput = true
@Language("JavaScript") val viewCode = """
function (doc) {
var pkeys = ${json(e.pkColumnIndexes)};
var columns = ${json(columnNameArray)};
var e = {};
var row = doc.row;
var length = row.length;
for (var i = 0; i < length; i++) e[columns[i]] = row[i];
emit(${if (e.pkColumnIndexes.size < 2) "doc._id" else "JSON.parse(doc._id)"}, e)
}""".trimIndent()
val terseViewsString = json(mapOf("_id" to "_design/meta",
"views" to mapOf(
"asMap" to mapOf(
"map" to (viewCode)
)
),
"language" to "javascript"))
err.println("attempting to write:\n" + terseViewsString + "\n----------")
couchConn.outputStream.write(terseViewsString.toByteArray(UTF_8))
err.println(couchTable + ": " + couchConn.responseCode to couchConn.responseMessage)
couchConn.disconnect()
}
val row = this.jdbcRows(columnNameArray)
row.chunked(bulkSize).forEach { rowChunk ->
try {
couchConn = URL(couchTable + "/_bulk_docs").openConnection() as HttpURLConnection
couchConn.requestMethod = "POST"
couchConn.setRequestProperty("Content-Type", "application/json")
couchConn.doInput = true
couchConn.doOutput = true
} catch (e: IOException) {
err.println("" +
couchConn.responseCode + " : " + couchConn.responseMessage
)
e.printStackTrace()
exitProcess(1)
}
couchConn.outputStream.write(json(mapOf("docs" to rowChunk.map { row ->
if (!terse)
rowAsMap(columnNameArray, e.pkColumnIndexes, row)
else
rowAsTuples(e.pkColumnIndexes, row).toMap()
})).toByteArray(UTF_8))
couchConn.outputStream.close()
err.println("${couchConn.url} : ${couchConn.responseCode} : ${couchConn.responseMessage}")
}
}
}
}
}
}
}
}
private fun printOptions() {
err.println(
"""
usage:
env vars:
${configs.values.joinToString(prefix = "[", postfix = "]", separator = "] [")}
cmdline:
${JdbcToCouchDbBulk.javaClass.canonicalName} http://[admin:somepassword]@0.0.0.0:5984/prefix_ jdbc:mysql://foo
""".trimIndent()
)
exit(1)
}
}
fun main(vararg args: String) {
JdbcToCouchDbBulk.go(args)
}