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rocksdb/thrift/server_options.h

214 lines
6.0 KiB

/**
* Options for the Thrift leveldb server.
* @author Dhruba Borthakur (dhruba@gmail.com)
* Copyright 2012 Facebook
*/
#ifndef THRIFT_LEVELDB_SERVER_OPTIONS_
#define THRIFT_LEVELDB_SERVER_OPTIONS_
#include <sys/stat.h>
#include <sys/types.h>
#include "leveldb/db.h"
#include "leveldb/cache.h"
//
// These are configuration options for the entire server.
//
class ServerOptions {
private:
int num_threads_; // number of thrift server threads
int cache_numshardbits_; // cache shards
long cache_size_; // cache size in bytes
int port_; // port number
std::string hostname_; // host name of this machine
std::string rootdir_; // root directory of all DBs
leveldb::Cache* cache_; // the block cache
// Number of concurrent threads to run.
const static int DEFAULT_threads = 1;
// Number of bytes to use as a cache of uncompressed data.
// Default setting of 100 MB
const static long DEFAULT_cache_size = 100 * 1024 * 1024;
// Number of shards for the block cache is 2 ** DEFAULT_cache_numshardbits.
// Negative means use default settings. This is applied only
// if DEFAULT_cache_size is non-negative.
const static int DEFAULT_cache_numshardbits = 6;
// default port
const static int DEFAULT_PORT = 6666;
public:
ServerOptions() : num_threads_(DEFAULT_threads),
cache_numshardbits_(DEFAULT_cache_numshardbits),
cache_size_(DEFAULT_cache_size),
port_(DEFAULT_PORT),
cache_(NULL) {
char* buf = new char[HOST_NAME_MAX];
if (gethostname(buf, HOST_NAME_MAX) == 0) {
hostname_ = buf;
} else {
hostname_ = "unknownhost";
delete buf;
}
rootdir_ = "/tmp"; // default rootdir
}
//
// Returns succes if all command line options are parsed successfully,
// otherwise returns false.
bool parseOptions(int argc, char** argv) {
int n;
uint64_t l;
char junk;
for (int i = 1; i < argc; i++) {
if (sscanf(argv[i], "--port=%d%c", &n, &junk) == 1) {
port_ = n;
} else if (sscanf(argv[i], "--threads=%d%c", &n, &junk) == 1) {
num_threads_ = n;
} else if (sscanf(argv[i], "--cache_size=%ld%c", &l, &junk) == 1) {
cache_size_ = l;
} else if (sscanf(argv[i], "--cache_numshardbits=%d%c", &n, &junk) == 1) {
cache_numshardbits_ = n;
} else if (strncmp(argv[i], "--hostname=", 10) == 0) {
hostname_ = argv[i] + 10;
} else if (strncmp(argv[i], "--rootdir=", 9) == 0) {
rootdir_ = argv[i] + 9;
} else {
fprintf(stderr, "Invalid flag '%s'\n", argv[i]);
return false;
}
}
return true;
}
// Create the directory format on disk.
// Returns true on success, false on failure
bool createDirectories() {
mode_t mode = 0755;
const char* dir = getRootDirectory().c_str();
if (mkpath(dir, mode) < 0) {
fprintf(stderr, "Unable to create root directory %s\n", dir);
return false;
}
dir = getDataDirectory().c_str();;
if (mkpath(dir, mode) < 0) {
fprintf(stderr, "Unable to create data directory %s\n", dir);
return false;
}
dir = getConfigDirectory().c_str();;
if (mkpath(dir, mode) < 0) {
fprintf(stderr, "Unable to create config directory %s\n", dir);
return false;
}
return true;
}
// create a cache instance that is shared by all DBs served by this server
void createCache() {
if (cache_numshardbits_ >= 1) {
cache_ = leveldb::NewLRUCache(cache_size_, cache_numshardbits_);
} else {
cache_ = leveldb::NewLRUCache(cache_size_);
}
}
// Returns the base server port
int getPort() {
return port_;
}
// Returns the assoc server port. Currently, it is one more than the base
// server port. In fiture, the assoc service would be supported on multiple
// ports, each port serving a distinct range of keys.
int getAssocPort() {
return port_ + 1;
}
// Returns the cache
leveldb::Cache* getCache() {
return cache_;
}
// Returns the configured number of server threads
int getNumThreads() {
return num_threads_;
}
// Returns the root directory where the server is rooted.
// The hostname is appended to the rootdir to arrive at the directory name.
std::string getRootDirectory() {
return rootdir_ + "/" + hostname_;
}
// Returns the directory where the server stores all users's DBs.
std::string getDataDirectory() {
return getRootDirectory() + "/userdata/";
}
// Returns the directory where the server stores all its configurations
std::string getConfigDirectory() {
return getRootDirectory() + "/config/";
}
// Returns the data directory for the specified DB
std::string getDataDirectory(const std::string& dbname) {
return getDataDirectory() + dbname;
}
// Returns true if the DB name is valid, otherwise return false
bool isValidName(const std::string& dbname) {
// The DB name cannot have '/' in the name
if (dbname.find('/') < dbname.size()) {
return false;
}
return true;
}
private:
static int do_mkdir(const char *path, mode_t mode) {
struct stat st;
int status = 0;
if (stat(path, &st) != 0) {
if (mkdir(path, mode) != 0) {
status = -1;
}
} else if (!S_ISDIR(st.st_mode)) {
errno = ENOTDIR;
status = -1;
}
return(status);
}
// mkpath - ensure all directories in path exist
static int mkpath(const char *path, mode_t mode)
{
char *pp;
char *sp;
int status;
char *newpath = strdup(path);
status = 0;
pp = newpath;
while (status == 0 && (sp = strchr(pp, '/')) != 0) {
if (sp != pp) {
/* Neither root nor double slash in path */
*sp = '\0';
status = do_mkdir(newpath, mode);
*sp = '/';
}
pp = sp + 1;
}
if (status == 0) {
status = do_mkdir(path, mode);
}
free(newpath);
return (status);
}
};
#endif // THRIFT_LEVELDB_SERVER_OPTIONS_