425 lines
8.7 KiB
C++
425 lines
8.7 KiB
C++
#include <errno.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <execinfo.h>
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#include "sys.h"
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String shell_exec(String cmd)
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{
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printf("(i) shell_exec(%s)\n", cmd.c_str());
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String data;
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FILE * stream;
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const int max_buffer = 256;
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char buffer[max_buffer];
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cmd.append(" 2>&1");
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stream = popen(cmd.c_str(), "r");
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if (stream) {
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while (!feof(stream))
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if (fgets(buffer, max_buffer, stream) != NULL) data.append(buffer);
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pclose(stream);
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}
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return data;
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}
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String shell_escape(String raw)
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{
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// FIXME
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return("\"" + raw + "\"");
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/*
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` U+0060 (Grave Accent) Backtick Command substitution
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~ U+007E Tilde Tilde expansion
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! U+0021 Exclamation mark History expansion
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# U+0023 Number sign Hash Comments
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$ U+0024 Dollar sign Parameter expansion
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& U+0026 Ampersand Background commands
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* U+002A Asterisk Filename expansion and globbing
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( U+0028 Left Parenthesis Subshells
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) U+0029 Right Parenthesis Subshells
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U+0009 Tab (⇥) Word splitting (whitespace)
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{ U+007B Left Curly Bracket Left brace Brace expansion
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[ U+005B Left Square Bracket Filename expansion and globbing
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| U+007C Vertical Line Vertical bar Pipelines
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\ U+005C Reverse Solidus Backslash Escape character
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; U+003B Semicolon Separating commands
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' U+0027 Apostrophe Single quote String quoting
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" U+0022 Quotation Mark Double quote String quoting with interpolation
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↩ U+000A Line Feed Newline Line break
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< U+003C Less than Input redirection
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> U+003E Greater than Output redirection
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? U+003F Question mark Filename expansion and globbing
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U+0020 Space Word splitting1 (whitespace)
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*/
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}
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String basename(String fn)
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{
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String result;
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while(fn.length() > 0)
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result = nibble("/", fn);
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//printf("basename(%s) %s\n", fn.c_str(), result.c_str());
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return(result);
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}
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String dirname(String fn)
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{
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String result;
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auto seg = split(fn, "/");
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seg.pop_back();
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result = join(seg, "/");
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//printf("dirname(%s) %s seg#%i\n", fn.c_str(), result.c_str(), seg.size());
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return(result);
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}
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bool mkdir(String path)
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{
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shell_exec(String("mkdir -p ")+" "+shell_escape(path));
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return(true);
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}
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bool file_exists(String path)
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{
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std::filesystem::path fp{ path };
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return(std::filesystem::exists(fp));
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}
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String file_get_contents(String file_name)
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{
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try
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{
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std::ifstream ifs(file_name);
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String content(
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(std::istreambuf_iterator<char>(ifs) ),
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(std::istreambuf_iterator<char>() ) );
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return(content);
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}
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catch(std::exception e)
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{
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return("");
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}
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}
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bool file_put_contents(String file_name, String content)
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{
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try
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{
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std::ofstream out(file_name);
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out << content;
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out.close();
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return(true);
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}
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catch(std::exception e)
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{
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return(false);
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}
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}
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String get_cwd()
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{
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return(std::filesystem::current_path());
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}
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void set_cwd(String path)
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{
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chdir(path.c_str());
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}
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time_t file_mtime(String file_name)
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{
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struct stat info;
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if (stat(file_name.c_str(), &info) != 0)
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{
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return(0);
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}
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else
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{
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return(info.st_mtime);
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}
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}
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void unlink(String file_name)
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{
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remove(file_name.c_str());
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}
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String expand_path(String path)
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{
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String result;
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auto base_path = split(get_cwd(), "/");
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auto rel_path = split(path, "/");
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for(auto& s : rel_path)
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{
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if(s == "..")
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{
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base_path.pop_back();
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}
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else if(s == ".")
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{
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}
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else
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{
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base_path.push_back(s);
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}
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}
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return(join(base_path, "/"));
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}
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f64 microtime()
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{
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return ((f64)std::chrono::duration_cast<std::chrono::microseconds>(
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std::chrono::high_resolution_clock::now().time_since_epoch()).count()) / 1000000;
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}
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u64 time()
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{
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return(std::time(0));
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}
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String date(String format, u64 timestamp)
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{
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String ts;
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String fmt;
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if(timestamp > 0)
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ts = String("-d '@")+std::to_string(timestamp)+"'";
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if(format != "")
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fmt = String("+'"+format+"'");
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return(trim(shell_exec("date "+ts+" "+fmt)));
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}
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String gmdate(String format, u64 timestamp)
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{
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String ts;
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String fmt;
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if(timestamp > 0)
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ts = String("-d '@")+std::to_string(timestamp)+"'";
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if(format == "RFC1123")
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format = "%a, %d %b %Y %T GMT";
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if(format != "")
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fmt = String("+'"+format+"'");
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return(trim(shell_exec("date -u "+ts+" "+fmt)));
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}
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u64 parse_time(String time_String)
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{
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return(int_val(trim(shell_exec("date -u -d '"+time_String+"' +'%s'"))));
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}
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u64 socket_connect(String host, short port)
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{
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/*String addrinfo {
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int ai_flags;
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int ai_family;
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int ai_socktype;
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int ai_protocol;
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socklen_t ai_addrlen;
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String sockaddr *ai_addr;
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char *ai_canonname;
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String addrinfo *ai_next;
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};*/
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auto sockfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
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if(sockfd < 0)
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{
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echo("SOCKET ERROR (could not open socket)\n");
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perror("SOCKET ERROR ");
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return(0);
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}
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struct sockaddr_in addr = {0};
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addr.sin_family = AF_INET;
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addr.sin_port = htons(port);
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addr.sin_addr.s_addr = inet_addr(host.c_str());
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if(connect(sockfd, (struct sockaddr*) &addr, sizeof(addr)) < 0)
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{
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echo("SOCKET ERROR (could not connect to address " + String(host) + ":" + std::to_string(port) + ")\n");
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perror("SOCKET ERROR ");
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return(0);
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}
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context->resources.sockets.push_back(sockfd);
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return(sockfd);
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}
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void socket_close(u64 sockfd)
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{
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close(sockfd);
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}
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bool socket_write(u64 sockfd, String data)
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{
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return(write(sockfd, data.c_str(), data.length()) >= 0);
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}
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String socket_read(u64 sockfd, u32 max_length, u32 timeout)
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{
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struct timeval tv;
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tv.tv_sec = timeout;
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tv.tv_usec = 0;
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setsockopt(sockfd, SOL_SOCKET, SO_RCVTIMEO, (const char*)&tv, sizeof tv);
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char buf[max_length+1];
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auto byte_count = recv(sockfd, buf, sizeof(buf), 0);
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if(byte_count > 0)
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{
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buf[byte_count] = 0;
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String result(buf, byte_count+1);
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return(result);
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}
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return("");
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}
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String memcache_escape_key(String key)
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{
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String result;
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for(auto c : key)
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{
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if(isspace(c))
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c = '_';
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result.append(1, c);
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}
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return(result);
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}
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StringList memcache_escape_keys(StringList keys)
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{
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StringList result;
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for(auto s : keys)
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{
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result.push_back(memcache_escape_key(s));
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}
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return(result);
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}
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u64 memcache_connect(String host, short port)
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{
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return(socket_connect(host, port));
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}
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String memcache_command(u64 connection, String command)
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{
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socket_write(connection, command+"\r\n");
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return(socket_read(connection)); // FIXME: do multi-chunk until END line is received!
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}
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bool memcache_set(u64 connection, String key, String value, u64 expires_in)
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{
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socket_write(connection,
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// set KEY META_DATA EXPIRY_TIME LENGTH_IN_BYTES
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String("set ") + memcache_escape_key(key) + " 0 " + std::to_string(expires_in) + " " + std::to_string(value.length()) + "\r\n" +
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value + "\r\n");
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return("STORED" == trim(socket_read(connection)));
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}
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bool memcache_delete(u64 connection, String key)
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{
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socket_write(connection,
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// set KEY META_DATA EXPIRY_TIME LENGTH_IN_BYTES
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String("delete ") + memcache_escape_key(key) + "\r\n"
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);
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return("DELETED" == trim(socket_read(connection)));
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}
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String memcache_get(u64 connection, String key, String default_value)
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{
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auto res = memcache_command(connection, String("get ")+memcache_escape_key(key));
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String t = nibble(res, " ");
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if(t == "VALUE")
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{
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String key = nibble(res, " ");
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String meta = nibble(res, " ");
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u32 length = stoi(nibble(res, "\r\n"));
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return(res.substr(0, length));
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}
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return(default_value);
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}
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StringMap memcache_get_multiple(u64 connection, StringList keys)
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{
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StringMap result;
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// to do: escape key String
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auto res = memcache_command(connection, String("get ")+join(memcache_escape_keys(keys), " "));
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while(res.length() > 0)
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{
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String t = nibble(res, " ");
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if(t == "VALUE")
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{
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String key = nibble(res, " ");
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String meta = nibble(res, " ");
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u32 length = stoi(nibble(res, "\r\n"));
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result[key] = res.substr(0, length);
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res = res.substr(length+2);
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}
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}
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return(result);
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}
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void on_segfault(int sig)
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{
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void *array[10];
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size_t size;
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// get void*'s for all entries on the stack
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size = backtrace(array, 10);
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// print out all the frames to stderr
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fprintf(stderr, "SEG FAULT: %d:\n", sig);
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backtrace_symbols_fd(array, size, STDERR_FILENO);
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exit(1);
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}
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struct Worker {
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pid_t pid;
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};
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std::map<pid_t, Worker> workers;
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#include <sys/wait.h>
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#include <sys/resource.h>
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#include <sys/prctl.h>
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void spawn_subprocess(std::function<void()> exec_after_spawn)
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{
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parent_pid = getpid();
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pid_t p;
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p = fork();
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if(p == 0)
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{
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my_pid = getpid();
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//printf("(C) child procress started, PID:%i\n", my_pid);
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prctl(PR_SET_PDEATHSIG, SIGHUP);
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exec_after_spawn();
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}
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else
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{
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Worker w;
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w.pid = p;
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workers[w.pid] = w;
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printf("(P) child procress spawned: PID %i\n", p);
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}
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}
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void on_child_exit(int sig)
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{
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pid_t pid;
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int status;
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if ((pid = waitpid(-1, &status, WNOHANG)) != -1)
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{
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if(workers.count(pid) > 0)
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{
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workers.erase(pid);
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printf("(P) child terminated (PID:%i)\n", pid);
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//spawn_subprocess();
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}
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}
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}
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