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Improved stream start handling

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This commit is contained in:
Thulinma 2018-05-09 10:05:25 +02:00
parent 017258b1b9
commit 92d14f52ea
3 changed files with 163 additions and 114 deletions
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248
lib/stream.cpp
View file

@ -73,7 +73,7 @@ void Util::sanitizeName(std::string & streamname) {
}
}
JSON::Value Util::getStreamConfig(std::string streamname){
JSON::Value Util::getStreamConfig(const std::string & streamname){
JSON::Value result;
if (streamname.size() > 100){
FAIL_MSG("Stream opening denied: %s is longer than 100 characters (%lu).", streamname.c_str(), streamname.size());
@ -83,8 +83,6 @@ JSON::Value Util::getStreamConfig(std::string streamname){
IPC::semaphore configLock(SEM_CONF, O_CREAT | O_RDWR, ACCESSPERMS, 1);
configLock.wait();
DTSC::Scan config = DTSC::Scan(mistConfOut.mapped, mistConfOut.len);
sanitizeName(streamname);
std::string smp = streamname.substr(0, streamname.find_first_of("+ "));
//check if smp (everything before + or space) exists
DTSC::Scan stream_cfg = config.getMember("streams").getMember(smp);
@ -97,6 +95,20 @@ JSON::Value Util::getStreamConfig(std::string streamname){
return result;
}
DTSC::Meta Util::getStreamMeta(const std::string & streamname){
DTSC::Meta ret;
char pageId[NAME_BUFFER_SIZE];
snprintf(pageId, NAME_BUFFER_SIZE, SHM_STREAM_INDEX, streamname.c_str());
IPC::sharedPage mPage(pageId, DEFAULT_STRM_PAGE_SIZE);
if (!mPage.mapped){
FAIL_MSG("Could not connect to metadata for %s", streamname.c_str());
return ret;
}
DTSC::Packet tmpMeta(mPage.mapped, mPage.len, true);
if (tmpMeta.getVersion()){ret.reinit(tmpMeta);}
return ret;
}
/// Checks if the given streamname has an active input serving it. Returns true if this is the case.
/// Assumes the streamname has already been through sanitizeName()!
bool Util::streamAlive(std::string & streamname){
@ -119,7 +131,7 @@ bool Util::streamAlive(std::string & streamname){
/// Then, checks if an input is already active by running streamAlive(). If yes, return true.
/// If no, loads up the server configuration and attempts to start the given stream according to current configuration.
/// At this point, fails and aborts if MistController isn't running.
bool Util::startInput(std::string streamname, std::string filename, bool forkFirst, bool isProvider) {
bool Util::startInput(std::string streamname, std::string filename, bool forkFirst, bool isProvider, const std::map<std::string, std::string> & overrides, pid_t * spawn_pid ) {
sanitizeName(streamname);
if (streamname.size() > 100){
FAIL_MSG("Stream opening denied: %s is longer than 100 characters (%lu).", streamname.c_str(), streamname.size());
@ -130,34 +142,23 @@ bool Util::startInput(std::string streamname, std::string filename, bool forkFir
//It's still possible a duplicate starts anyway, this is caught in the inputs initializer.
//Note: this uses the _whole_ stream name, including + (if any).
//This means "test+a" and "test+b" have separate locks and do not interact with each other.
if (streamAlive(streamname)){
uint8_t streamStat = getStreamStatus(streamname);
while (streamStat == STRMSTAT_SHUTDOWN){
while (streamStat != STRMSTAT_OFF && streamStat != STRMSTAT_READY){
if (streamStat == STRMSTAT_BOOT && overrides.count("throughboot")){
break;
}
Util::sleep(250);
streamStat = getStreamStatus(streamname);
}
if (streamStat != STRMSTAT_OFF){
if (streamAlive(streamname) && !overrides.count("alwaysStart")){
DEBUG_MSG(DLVL_MEDIUM, "Stream %s already active; continuing", streamname.c_str());
return true;
}
}
//Attempt to load up configuration and find this stream
IPC::sharedPage mistConfOut(SHM_CONF, DEFAULT_CONF_PAGE_SIZE);
IPC::semaphore configLock(SEM_CONF, O_CREAT | O_RDWR, ACCESSPERMS, 1);
//Lock the config to prevent race conditions and corruption issues while reading
configLock.wait();
DTSC::Scan config = DTSC::Scan(mistConfOut.mapped, mistConfOut.len);
//Abort if no config available
if (!config){
FAIL_MSG("Configuration not available, aborting! Is MistController running?");
configLock.post();//unlock the config semaphore
return false;
}
//Find stream base name
std::string smp = streamname.substr(0, streamname.find_first_of("+ "));
//check if base name (everything before + or space) exists
DTSC::Scan stream_cfg = config.getMember("streams").getMember(smp);
const JSON::Value stream_cfg = getStreamConfig(streamname);
if (!stream_cfg){
DEBUG_MSG(DLVL_HIGH, "Stream %s not configured - attempting to ignore", streamname.c_str());
}
@ -166,102 +167,56 @@ bool Util::startInput(std::string streamname, std::string filename, bool forkFir
if (!filename.size()){
if (!stream_cfg){
DEBUG_MSG(DLVL_MEDIUM, "Stream %s not configured, no source manually given, cannot start", streamname.c_str());
configLock.post();//unlock the config semaphore
return false;
}
filename = stream_cfg.getMember("source").asString();
filename = stream_cfg["source"].asStringRef();
}
//check in curConf for capabilities-inputs-<naam>-priority/source_match
std::string player_bin;
bool selected = false;
long long int curPrio = -1;
DTSC::Scan inputs = config.getMember("capabilities").getMember("inputs");
DTSC::Scan input;
unsigned int input_size = inputs.getSize();
bool noProviderNoPick = false;
for (unsigned int i = 0; i < input_size; ++i){
DTSC::Scan tmp_input = inputs.getIndice(i);
//if match voor current stream && priority is hoger dan wat we al hebben
if (tmp_input.getMember("source_match") && curPrio < tmp_input.getMember("priority").asInt()){
if (tmp_input.getMember("source_match").getSize()){
for(unsigned int j = 0; j < tmp_input.getMember("source_match").getSize(); ++j){
std::string source = tmp_input.getMember("source_match").getIndice(j).asString();
std::string front = source.substr(0,source.find('*'));
std::string back = source.substr(source.find('*')+1);
MEDIUM_MSG("Checking input %s: %s (%s)", inputs.getIndiceName(i).c_str(), tmp_input.getMember("name").asString().c_str(), source.c_str());
if (filename.substr(0,front.size()) == front && filename.substr(filename.size()-back.size()) == back){
if (tmp_input.getMember("non-provider") && !isProvider){
noProviderNoPick = true;
continue;
}
player_bin = Util::getMyPath() + "MistIn" + tmp_input.getMember("name").asString();
curPrio = tmp_input.getMember("priority").asInt();
selected = true;
input = tmp_input;
}
}
}else{
std::string source = tmp_input.getMember("source_match").asString();
std::string front = source.substr(0,source.find('*'));
std::string back = source.substr(source.find('*')+1);
MEDIUM_MSG("Checking input %s: %s (%s)", inputs.getIndiceName(i).c_str(), tmp_input.getMember("name").asString().c_str(), source.c_str());
if (filename.substr(0,front.size()) == front && filename.substr(filename.size()-back.size()) == back){
if (tmp_input.getMember("non-provider") && !isProvider){
noProviderNoPick = true;
continue;
}
player_bin = Util::getMyPath() + "MistIn" + tmp_input.getMember("name").asString();
curPrio = tmp_input.getMember("priority").asInt();
selected = true;
input = tmp_input;
}
}
}
}
if (!selected){
configLock.post();//unlock the config semaphore
if (noProviderNoPick){
INFO_MSG("Not a media provider for stream %s: %s", streamname.c_str(), filename.c_str());
}else{
FAIL_MSG("No compatible input found for stream %s: %s", streamname.c_str(), filename.c_str());
}
return false;
}
const JSON::Value input = getInputBySource(filename, isProvider);
if (!input){return false;}
//copy the necessary arguments to separate storage so we can unlock the config semaphore safely
std::map<std::string, std::string> str_args;
//check required parameters
DTSC::Scan required = input.getMember("required");
unsigned int req_size = required.getSize();
for (unsigned int i = 0; i < req_size; ++i){
std::string opt = required.getIndiceName(i);
if (!stream_cfg.getMember(opt)){
configLock.post();//unlock the config semaphore
FAIL_MSG("Required parameter %s for stream %s missing", opt.c_str(), streamname.c_str());
if (input.isMember("required")){
jsonForEachConst(input["required"], prm){
const std::string opt = (*prm)["option"].asStringRef();
//check for overrides
if (overrides.count(opt)){
str_args[opt] = overrides.at(opt);
}else{
if (!stream_cfg.isMember(prm.key())){
FAIL_MSG("Required parameter %s for stream %s missing", prm.key().c_str(), streamname.c_str());
return false;
}
str_args[required.getIndice(i).getMember("option").asString()] = stream_cfg.getMember(opt).asString();
str_args[opt] = stream_cfg[opt].asStringRef();
}
}
}
//check optional parameters
DTSC::Scan optional = input.getMember("optional");
unsigned int opt_size = optional.getSize();
for (unsigned int i = 0; i < opt_size; ++i){
std::string opt = optional.getIndiceName(i);
VERYHIGH_MSG("Checking optional %u: %s", i, opt.c_str());
if (stream_cfg.getMember(opt)){
str_args[optional.getIndice(i).getMember("option").asString()] = stream_cfg.getMember(opt).asString();
if (input.isMember("optional")){
jsonForEachConst(input["optional"], prm){
const std::string opt = (*prm)["option"].asStringRef();
//check for overrides
if (overrides.count(opt)){
str_args[opt] = overrides.at(opt);
}else{
if (stream_cfg.isMember(prm.key())){
str_args[opt] = stream_cfg[prm.key()].asStringRef();
}
}
if (!prm->isMember("type") && str_args.count(opt)){
str_args[opt] = "";
}
}
}
//finally, unlock the config semaphore
configLock.post();
if (isProvider){
//Set environment variable so we can know if we have a provider when re-exec'ing.
setenv("MISTPROVIDER", "1", 1);
}
std::string player_bin = Util::getMyPath() + "MistIn" + input["name"].asStringRef();
INFO_MSG("Starting %s -s %s %s", player_bin.c_str(), streamname.c_str(), filename.c_str());
char * argv[30] = {(char *)player_bin.c_str(), (char *)"-s", (char *)streamname.c_str(), (char *)filename.c_str()};
int argNum = 3;
@ -273,11 +228,14 @@ bool Util::startInput(std::string streamname, std::string filename, bool forkFir
}
for (std::map<std::string, std::string>::iterator it = str_args.begin(); it != str_args.end(); ++it){
argv[++argNum] = (char *)it->first.c_str();
if (it->second.size()){
argv[++argNum] = (char *)it->second.c_str();
INFO_MSG(" Option %s = %s", it->first.c_str(), it->second.c_str());
}
}
argv[++argNum] = (char *)0;
Util::Procs::setHandler();
int pid = 0;
if (forkFirst){
DEBUG_MSG(DLVL_DONTEVEN, "Forking");
@ -301,15 +259,99 @@ bool Util::startInput(std::string streamname, std::string filename, bool forkFir
execvp(argv[0], argv);
FAIL_MSG("Starting process %s for stream %s failed: %s", argv[0], streamname.c_str(), strerror(errno));
_exit(42);
}else if (spawn_pid != NULL){
*spawn_pid = pid;
}
unsigned int waiting = 0;
while (!streamAlive(streamname) && ++waiting < 40){
while (!streamAlive(streamname) && ++waiting < 240){
Util::wait(250);
if (!Util::Procs::isRunning(pid)){
FAIL_MSG("Input process shut down before stream coming online, aborting.");
break;
}
}
return streamAlive(streamname);
}
JSON::Value Util::getInputBySource(const std::string &filename, bool isProvider){
JSON::Value ret;
//Attempt to load up configuration and find this stream
IPC::sharedPage mistConfOut(SHM_CONF, DEFAULT_CONF_PAGE_SIZE);
IPC::semaphore configLock(SEM_CONF, O_CREAT | O_RDWR, ACCESSPERMS, 1);
//Lock the config to prevent race conditions and corruption issues while reading
configLock.wait();
DTSC::Scan config = DTSC::Scan(mistConfOut.mapped, mistConfOut.len);
//Abort if no config available
if (!config){
FAIL_MSG("Configuration not available, aborting! Is MistController running?");
configLock.post();//unlock the config semaphore
return false;
}
//check in curConf for capabilities-inputs-<naam>-priority/source_match
bool selected = false;
long long int curPrio = -1;
DTSC::Scan inputs = config.getMember("capabilities").getMember("inputs");
DTSC::Scan input;
unsigned int input_size = inputs.getSize();
bool noProviderNoPick = false;
for (unsigned int i = 0; i < input_size; ++i){
DTSC::Scan tmp_input = inputs.getIndice(i);
//if match voor current stream && priority is hoger dan wat we al hebben
if (tmp_input.getMember("source_match") && curPrio < tmp_input.getMember("priority").asInt()){
if (tmp_input.getMember("source_match").getSize()){
for(unsigned int j = 0; j < tmp_input.getMember("source_match").getSize(); ++j){
std::string source = tmp_input.getMember("source_match").getIndice(j).asString();
std::string front = source.substr(0,source.find('*'));
std::string back = source.substr(source.find('*')+1);
MEDIUM_MSG("Checking input %s: %s (%s)", inputs.getIndiceName(i).c_str(), tmp_input.getMember("name").asString().c_str(), source.c_str());
if (filename.substr(0,front.size()) == front && filename.substr(filename.size()-back.size()) == back){
if (tmp_input.getMember("non-provider") && !isProvider){
noProviderNoPick = true;
continue;
}
curPrio = tmp_input.getMember("priority").asInt();
selected = true;
input = tmp_input;
}
}
}else{
std::string source = tmp_input.getMember("source_match").asString();
std::string front = source.substr(0,source.find('*'));
std::string back = source.substr(source.find('*')+1);
MEDIUM_MSG("Checking input %s: %s (%s)", inputs.getIndiceName(i).c_str(), tmp_input.getMember("name").asString().c_str(), source.c_str());
if (filename.substr(0,front.size()) == front && filename.substr(filename.size()-back.size()) == back){
if (tmp_input.getMember("non-provider") && !isProvider){
noProviderNoPick = true;
continue;
}
curPrio = tmp_input.getMember("priority").asInt();
selected = true;
input = tmp_input;
}
}
}
}
if (!selected){
if (noProviderNoPick){
INFO_MSG("Not a media provider for input: %s", filename.c_str());
}else{
FAIL_MSG("No compatible input found for: %s", filename.c_str());
}
}else{
ret = input.asJSON();
}
configLock.post();//unlock the config semaphore
return ret;
}
uint8_t Util::getStreamStatus(const std::string & streamname){
char pageName[NAME_BUFFER_SIZE];
snprintf(pageName, NAME_BUFFER_SIZE, SHM_STREAM_STATE, streamname.c_str());

7
lib/stream.h
View file

@ -5,13 +5,16 @@
#include <string>
#include "socket.h"
#include "json.h"
#include "dtsc.h"
namespace Util {
std::string getTmpFolder();
void sanitizeName(std::string & streamname);
bool streamAlive(std::string & streamname);
bool startInput(std::string streamname, std::string filename = "", bool forkFirst = true, bool isProvider = false);
JSON::Value getStreamConfig(std::string streamname);
bool startInput(std::string streamname, std::string filename = "", bool forkFirst = true, bool isProvider = false, const std::map<std::string, std::string> & overrides = std::map<std::string, std::string>(), pid_t * spawn_pid = NULL);
JSON::Value getStreamConfig(const std::string & streamname);
JSON::Value getInputBySource(const std::string & filename, bool isProvider = false);
DTSC::Meta getStreamMeta(const std::string & streamname);
uint8_t getStreamStatus(const std::string & streamname);
}

8
src/input/input.cpp
View file

@ -100,6 +100,8 @@ namespace Mist {
return 0;
}
INFO_MSG("Booting input for stream %s", streamName.c_str());
if (!checkArguments()) {
FAIL_MSG("Setup failed - exiting");
return 0;
@ -152,7 +154,7 @@ namespace Mist {
}
//if the exit was clean, don't restart it
if (WIFEXITED(status) && (WEXITSTATUS(status) == 0)){
MEDIUM_MSG("Input for stream %s shut down cleanly", streamName.c_str());
INFO_MSG("Input for stream %s shut down cleanly", streamName.c_str());
break;
}
char pageName[NAME_BUFFER_SIZE];
@ -359,7 +361,9 @@ namespace Mist {
WARN_MSG("Stream already online, cancelling");
return;
}
if (!Util::startInput(streamName, "push://INTERNAL_ONLY:"+config->getString("input"), true, true)) {//manually override stream url to start the buffer
std::map<std::string, std::string> overrides;
overrides["throughboot"] = "";
if (!Util::startInput(streamName, "push://INTERNAL_ONLY:"+config->getString("input"), true, true, overrides)) {//manually override stream url to start the buffer
pullLock.post();
pullLock.close();
pullLock.unlink();