ch07 progress

scripts/installGatling.sc

@@ -1,5 +1,5 @@
 #!/usr/bin/env -S scala-cli
-//> using dep com.lihaoyi::os-lib:0.10.2
+//> using dep com.lihaoyi::os-lib:0.10.3
 
 // download Gatling Highcharts Bundle
 println("Downloading Gatling 3.10.5 to directory ./gatling")

src/main/scala/ch07/common/common.scala

@@ -2,6 +2,7 @@ package ch07
 
 import collection.mutable.{Map => MMap}
 
+// used in curlSync, curlAsync
 case class ResponseState(
     var code: Int = 200,
     var headers: MMap[String, String] = MMap(),

src/main/scala/ch07/common/libcurl.scala

@@ -14,7 +14,7 @@ object LibCurl:
   type MultiCurl = Ptr[Byte]
   type CurlRequest = CStruct4[Ptr[Byte], Long, Long, Int]
   type CurlMessage = CStruct3[Int, Curl, Ptr[Byte]]
-  type CurlSList = CStruct2[Ptr[Byte], CString]
+  type CurlSList = CStruct2[Ptr[Byte], CString] // linked list for Http headers
   type CurlDataCallback = CFuncPtr4[Ptr[Byte], CSize, CSize, Ptr[Byte], CSize]
   type CurlSocketCallback = CFuncPtr5[Curl, Ptr[Byte], CInt, Ptr[Byte], Ptr[Byte], CInt]
   type CurlTimerCallback = CFuncPtr3[MultiCurl, Long, Ptr[Byte], CInt]
@@ -35,12 +35,12 @@ object LibCurl:
   def curl_easy_setopt(handle: Curl, option: CurlOption, parameter: CVarArgList): CInt =
     extern
 
-  @name("curl_easy_setopt")
+  @name("curl_easy_setopt") // convert URL to CString, pass it to easy_setopt
   def curl_easy_setopt(handle: Curl, option: CurlOption, parameter: Ptr[Byte]): CInt =
     extern
 
   @name("curl_easy_getinfo")
-  def easy_getinfo(handle: Curl, info: CInt, parameter: Ptr[Byte]): CInt = extern
+  def easy_getinfo(handle: Curl, info: CurlInfo, parameter: Ptr[Byte]): CInt = extern
 
   @name("curl_multi_add_handle")
   def multi_add_handle(multi: MultiCurl, easy: Curl): Int = extern

src/main/scala/ch07/curlSync/main.scala

@@ -63,12 +63,24 @@ object CurlBasic:
 
       size * nmemb
 
+  // .+?   : match any chars one or more times, but shortest match possible until space.
+  // (\d+) : match any digits one or more times. (capture group)
+  // (.+)  : match any chars one or more times, as long as possible, until space. (group)
+  // For example:    .+?   (\d+) (.+)
+  //              HTTP/1.1  200   OK
   val statusLine = raw".+? (\d+) (.+)\n".r
+
+  // ([^:]+) : match any chars except : one or more times. (capture group)
+  // (.*)    : match any chars 0 or more times, as long as possible, until space. (group)
+  // For example, ([^:]+): (   .*    )
+  //                 Host: 192.168.1.1
+  //                 Port: 8080
   val headerLine = raw"([^:]+): (.*)\n".r
+
   val headerCB = CFuncPtr4.fromScalaFunction[Ptr[Byte], CSize, CSize, Ptr[Byte], CSize]:
     (ptr: Ptr[Byte], size: CSize, nmemb: CSize, data: Ptr[Byte]) =>
       val serial = !(data.asInstanceOf[Ptr[Long]])
-      val len = stackalloc[Double]()
+      val len = stackalloc[Double](1)
       !len = 0
       val byteSize = size * nmemb
       val headerString = bufferToString(ptr, size, nmemb)