Analysers rewrite, mostly by Ramkoemar, partially by myself

src/analysers/analyser.cpp

@@ -0,0 +1,80 @@
+#include "analyser.h"
+#include <iostream>
+#include <mist/timing.h>
+
+/// Reads configuration and opens a passed filename replacing standard input if needed.
+Analyser::Analyser(Util::Config &conf){
+  detail = conf.getInteger("detail");
+  mediaTime = 0;
+  upTime = Util::bootSecs();
+  isActive = &conf.is_active;
+}
+
+///Opens the filename. Supports stdin and plain files.
+bool Analyser::open(const std::string & filename){
+  if (filename.size() && filename != "-"){
+    int fp = ::open(filename.c_str(), O_RDONLY);
+    if (fp <= 0){
+      FAIL_MSG("Cannot open '%s': %s", filename.c_str(), strerror(errno));
+      return false;
+    }
+    dup2(fp, STDIN_FILENO);
+    close(fp);
+    INFO_MSG("Parsing %s...", filename.c_str());
+  }else{
+    INFO_MSG("Parsing standard input...");
+  }
+  return true;
+}
+
+/// Stops analysis by closing the standard input
+void Analyser::stop(){
+  close(STDIN_FILENO);
+  std::cin.setstate(std::ios_base::eofbit);
+}
+
+///Checks if standard input is still valid.
+bool Analyser::isOpen(){
+  return (*isActive) && std::cin.good();
+}
+
+/// Main loop for all analysers. Reads packets while not interrupted, parsing and/or printing them.
+int Analyser::run(Util::Config &conf){
+  isActive = &conf.is_active;
+  if (!open(conf.getString("filename"))){
+    return 1;
+  }
+  while (conf.is_active && isOpen()){
+    if (!parsePacket()){
+      if (isOpen()){
+        FAIL_MSG("Could not parse packet!");
+        return 1;
+      }
+      INFO_MSG("Reached end of file");
+      return 0;
+    }
+  }
+  return 0;
+}
+
+/// Sets options common to all analysers.
+/// Should generally be called by the init function of each analyser.
+void Analyser::init(Util::Config &conf){
+  JSON::Value opt;
+
+  opt["arg_num"] = 1ll;
+  opt["arg"] = "string";
+  opt["default"] = "-";
+  opt["help"] = "Filename to analyse, or - for standard input (default)";
+  conf.addOption("filename", opt);
+  opt.null();
+
+  opt["long"] = "detail";
+  opt["short"] = "D";
+  opt["arg"] = "num";
+  opt["default"] = 2ll;
+  opt["help"] = "Detail level for analysis (0 = none, 2 = default, 10 = max)";
+  conf.addOption("detail", opt);
+  opt.null();
+}
+