diff options
Diffstat (limited to 'kamon-newrelic/src/main/scala/kamon/newrelic/NewRelicJsonPrinter.scala')
| -rw-r--r-- | kamon-newrelic/src/main/scala/kamon/newrelic/NewRelicJsonPrinter.scala | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/kamon-newrelic/src/main/scala/kamon/newrelic/NewRelicJsonPrinter.scala b/kamon-newrelic/src/main/scala/kamon/newrelic/NewRelicJsonPrinter.scala new file mode 100644 index 00000000..713a5586 --- /dev/null +++ b/kamon-newrelic/src/main/scala/kamon/newrelic/NewRelicJsonPrinter.scala @@ -0,0 +1,59 @@ +package kamon.newrelic + +import java.lang.{ StringBuilder ⇒ JStringBuilder } +import spray.json._ +import scala.annotation.tailrec + +// We need a special treatment of / that needs to be escaped as \/ for New Relic to work properly with all metrics. +// Without this custom json printer the scoped metrics are not displayed in the site. + +// format: OFF +trait NewRelicJsonPrinter extends CompactPrinter { + + override def printString(s: String, sb: JStringBuilder) { + import NewRelicJsonPrinter._ + @tailrec def firstToBeEncoded(ix: Int = 0): Int = + if (ix == s.length) -1 else if (requiresEncoding(s.charAt(ix))) ix else firstToBeEncoded(ix + 1) + + sb.append('"') + firstToBeEncoded() match { + case -1 ⇒ sb.append(s) + case first ⇒ + sb.append(s, 0, first) + @tailrec def append(ix: Int): Unit = + if (ix < s.length) { + s.charAt(ix) match { + case c if !requiresEncoding(c) => sb.append(c) + case '"' => sb.append("\\\"") + case '\\' => sb.append("\\\\") + case '/' => sb.append("\\/") + case '\b' => sb.append("\\b") + case '\f' => sb.append("\\f") + case '\n' => sb.append("\\n") + case '\r' => sb.append("\\r") + case '\t' => sb.append("\\t") + case x if x <= 0xF => sb.append("\\u000").append(Integer.toHexString(x)) + case x if x <= 0xFF => sb.append("\\u00").append(Integer.toHexString(x)) + case x if x <= 0xFFF => sb.append("\\u0").append(Integer.toHexString(x)) + case x => sb.append("\\u").append(Integer.toHexString(x)) + } + append(ix + 1) + } + append(first) + } + sb.append('"') + } +} + +object NewRelicJsonPrinter extends NewRelicJsonPrinter { + + def requiresEncoding(c: Char): Boolean = + // from RFC 4627 + // unescaped = %x20-21 / %x23-5B / %x5D-10FFFF + c match { + case '"' ⇒ true + case '\\' ⇒ true + case '/' ⇒ true + case c ⇒ c < 0x20 + } +}
\ No newline at end of file |