#include <stdio.h>
#include <string.h>
#include <stdlib.h>
+#include <limits.h>
#include <ctype.h>
#include <assert.h>
+#include <map>
#include <vector>
#include <string>
using namespace std;
-vector<ConfigLine> parse_config(const string &filename)
-{
- vector<ConfigLine> ret;
+struct ConfigLine {
+ string keyword;
+ vector<string> arguments;
+ map<string, string> parameters;
+};
+bool read_config(const string &filename, vector<ConfigLine> *lines)
+{
FILE *fp = fopen(filename.c_str(), "r");
if (fp == NULL) {
perror(filename.c_str());
- exit(1);
+ return false;
}
char buf[4096];
}
}
- ret.push_back(line);
+ lines->push_back(line);
}
fclose(fp);
- return ret;
+ return true;
}
-string fetch_config_string(const vector<ConfigLine> &config, const string &keyword,
- ParameterType parameter_type, const string &default_value)
+bool fetch_config_string(const vector<ConfigLine> &config, const string &keyword, string *value)
{
- assert(parameter_type == PARAMATER_MANDATORY || parameter_type == PARAMETER_OPTIONAL);
for (unsigned i = 0; i < config.size(); ++i) {
if (config[i].keyword != keyword) {
continue;
if (config[i].parameters.size() > 0 ||
config[i].arguments.size() != 1) {
fprintf(stderr, "ERROR: '%s' takes one argument and no parameters\n", keyword.c_str());
- exit(1);
+ return false;
}
- return config[i].arguments[0];
- }
- if (parameter_type == PARAMATER_MANDATORY) {
- fprintf(stderr, "ERROR: Missing '%s' statement in config file.\n",
- keyword.c_str());
- exit(1);
- } else {
- return default_value;
+ *value = config[i].arguments[0];
+ return true;
}
+ return false;
}
-int fetch_config_int(const std::vector<ConfigLine> &config, const std::string &keyword,
- int min_limit, int max_limit,
- ParameterType parameter_type, int default_value)
+bool fetch_config_int(const vector<ConfigLine> &config, const string &keyword, int *value)
{
- assert(parameter_type == PARAMATER_MANDATORY || parameter_type == PARAMETER_OPTIONAL);
- bool value_found = false;
- int value = -1;
for (unsigned i = 0; i < config.size(); ++i) {
if (config[i].keyword != keyword) {
continue;
if (config[i].parameters.size() > 0 ||
config[i].arguments.size() != 1) {
fprintf(stderr, "ERROR: '%s' takes one argument and no parameters\n", keyword.c_str());
- exit(1);
+ return false;
+ }
+ *value = atoi(config[i].arguments[0].c_str()); // TODO: verify int validity.
+ return true;
+ }
+ return false;
+}
+
+bool parse_port(const ConfigLine &line, Config *config)
+{
+ if (line.arguments.size() != 1) {
+ fprintf(stderr, "ERROR: 'port' takes exactly one argument\n");
+ return false;
+ }
+
+ AcceptorConfig acceptor;
+ acceptor.port = atoi(line.arguments[0].c_str());
+ if (acceptor.port < 1 || acceptor.port >= 65536) {
+ fprintf(stderr, "ERROR: port %d is out of range (must be [1,65536>).\n", acceptor.port);
+ return false;
+ }
+
+ config->acceptors.push_back(acceptor);
+ return true;
+}
+
+int allocate_mark_pool(int from, int to, Config *config)
+{
+ int pool_index = -1;
+
+ // Reuse mark pools if an identical one exists.
+ // Otherwise, check if we're overlapping some other mark pool.
+ for (size_t i = 0; i < config->mark_pools.size(); ++i) {
+ const MarkPoolConfig &pool = config->mark_pools[i];
+ if (from == pool.from && to == pool.to) {
+ pool_index = i;
+ } else if ((from >= pool.from && from < pool.to) ||
+ (to >= pool.from && to < pool.to)) {
+ fprintf(stderr, "WARNING: Mark pool %d-%d partially overlaps with %d-%d, you may get duplicate marks.\n",
+ from, to, pool.from, pool.to);
+ fprintf(stderr, " Mark pools must either be completely disjunct, or completely overlapping.\n");
}
- value_found = true;
- value = atoi(config[i].arguments[0].c_str()); // TODO: verify int validity.
}
- if (!value_found) {
- if (parameter_type == PARAMETER_OPTIONAL) {
- return default_value;
+
+ if (pool_index != -1) {
+ return pool_index;
+ }
+
+ // No match to existing pools.
+ MarkPoolConfig pool;
+ pool.from = from;
+ pool.to = to;
+ config->mark_pools.push_back(pool);
+
+ return config->mark_pools.size() - 1;
+}
+
+bool parse_mark_pool(const string &mark_str, int *from, int *to)
+{
+ size_t split = mark_str.find_first_of('-');
+ if (split == string::npos) {
+ fprintf(stderr, "ERROR: Invalid mark specification '%s' (expected 'X-Y').\n",
+ mark_str.c_str());
+ return false;
+ }
+
+ string from_str(mark_str.begin(), mark_str.begin() + split);
+ string to_str(mark_str.begin() + split + 1, mark_str.end());
+ *from = atoi(from_str.c_str());
+ *to = atoi(to_str.c_str());
+
+ if (*from <= 0 || *from >= 65536 || *to <= 0 || *to >= 65536) {
+ fprintf(stderr, "ERROR: Mark pool range %d-%d is outside legal range [1,65536>.\n",
+ *from, *to);
+ return false;
+ }
+
+ return true;
+}
+
+bool parse_stream(const ConfigLine &line, Config *config)
+{
+ if (line.arguments.size() != 1) {
+ fprintf(stderr, "ERROR: 'stream' takes exactly one argument\n");
+ return false;
+ }
+
+ StreamConfig stream;
+ stream.stream_id = line.arguments[0];
+
+ map<string, string>::const_iterator src_it = line.parameters.find("src");
+ if (src_it == line.parameters.end()) {
+ fprintf(stderr, "WARNING: stream '%s' has no src= attribute, clients will not get any data.\n",
+ stream.stream_id.c_str());
+ } else {
+ stream.src = src_it->second;
+ // TODO: Verify that the URL is parseable?
+ }
+
+ // Parse marks, if so desired.
+ map<string, string>::const_iterator mark_parm_it = line.parameters.find("mark");
+ if (mark_parm_it == line.parameters.end()) {
+ stream.mark_pool = -1;
+ } else {
+ int from, to;
+ if (!parse_mark_pool(mark_parm_it->second, &from, &to)) {
+ return false;
}
- fprintf(stderr, "ERROR: Missing '%s' statement in config file.\n",
- keyword.c_str());
- exit(1);
+ stream.mark_pool = allocate_mark_pool(from, to, config);
+ }
+
+ config->streams.push_back(stream);
+ return true;
+}
+
+bool parse_config(const string &filename, Config *config)
+{
+ vector<ConfigLine> lines;
+ if (!read_config(filename, &lines)) {
+ return false;
}
- if (value < min_limit || value > max_limit) {
- fprintf(stderr, "ERROR: '%s' is set to %d, must be in [%d,%d]\n",
- keyword.c_str(), value, min_limit, max_limit);
- exit(1);
+
+ if (!fetch_config_int(lines, "num_servers", &config->num_servers)) {
+ fprintf(stderr, "ERROR: Missing 'num_servers' statement in config file.\n");
+ return false;
+ }
+ if (config->num_servers < 1 || config->num_servers >= 20000) { // Insanely high max limit.
+ fprintf(stderr, "ERROR: 'num_servers' is %d, needs to be in [1, 20000>.\n", config->num_servers);
+ return false;
+ }
+
+ // See if the user wants stats.
+ config->stats_interval = 60;
+ bool has_stats_file = fetch_config_string(lines, "stats_file", &config->stats_file);
+ bool has_stats_interval = fetch_config_int(lines, "stats_interval", &config->stats_interval);
+ if (has_stats_interval && !has_stats_file) {
+ fprintf(stderr, "WARNING: 'stats_interval' given, but no 'stats_file'. No statistics will be written.\n");
}
- return value;
+
+ for (size_t i = 0; i < lines.size(); ++i) {
+ const ConfigLine &line = lines[i];
+ if (line.keyword == "num_servers" ||
+ line.keyword == "stats_file" ||
+ line.keyword == "stats_interval") {
+ // Already taken care of, above.
+ } else if (line.keyword == "port") {
+ if (!parse_port(line, config)) {
+ return false;
+ }
+ } else if (line.keyword == "stream") {
+ if (!parse_stream(line, config)) {
+ return false;
+ }
+ } else {
+ fprintf(stderr, "ERROR: Unknown configuration keyword '%s'.\n",
+ line.keyword.c_str());
+ return false;
+ }
+ }
+
+ return true;
}
projects / cubemap / blobdiff