534 lines
19 KiB
C++
534 lines
19 KiB
C++
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#include <vector>
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#include <utility>
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#include <errlog.h>
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#include <epicsString.h>
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#include <epicsAtomic.h>
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#define epicsExportSharedSymbols
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#include "helper.h"
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#include "pdbsingle.h"
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#include "pvif.h"
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#ifdef USE_MULTILOCK
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# include "pdbgroup.h"
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#endif
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namespace pvd = epics::pvData;
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namespace pva = epics::pvAccess;
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int PDBProviderDebug = 3;
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namespace {
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struct Splitter {
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const char sep, *cur, *end;
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Splitter(const char *s, char sep)
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:sep(sep), cur(s)
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{
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assert(s);
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end = strchr(cur, sep);
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}
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bool operator!() const { return !cur; }
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bool snip(std::string& ret) {
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if(!cur) return false;
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if(end) ret = std::string(cur, end-cur);
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else ret = std::string(cur);
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if(end) {
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cur = end+1;
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end = strchr(cur, sep);
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} else {
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cur = NULL;
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}
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return true;
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}
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};
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struct GroupMemberInfo {
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// consumes builder
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GroupMemberInfo(const std::string& a, const std::string& b, p2p::auto_ptr<PVIFBuilder>& builder)
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:pvname(a), pvfldname(b), builder(PTRMOVE(builder)) {}
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std::string pvname, // aka. name passed to dbChannelOpen()
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pvfldname; // PVStructure sub-field
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std::set<size_t> triggers; // indices in GroupInfo::members which are post()d on events from pvfldname
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size_t index; // index in GroupInfo::members
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p2p::auto_ptr<PVIFBuilder> builder;
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};
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struct GroupInfo {
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GroupInfo(const std::string& name) : name(name),atomic(Unset),hastriggers(false) {}
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std::string name;
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typedef std::vector<GroupMemberInfo> members_t;
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members_t members;
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typedef std::map<std::string, size_t> members_map_t;
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members_map_t members_map;
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typedef std::set<std::string> triggers_set_t;
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typedef std::map<std::string, triggers_set_t> triggers_t;
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triggers_t triggers;
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enum tribool {Unset,True,False} atomic;
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bool hastriggers;
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};
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// Iterates all PDB records and gathers info() to construct PDB groups
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struct PDBProcessor
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{
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typedef std::map<std::string, GroupInfo> groups_t;
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groups_t groups;
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std::string recbase;
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GroupInfo *curgroup;
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// validate trigger mappings and process into bit map form
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void resolveTriggers()
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{
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FOREACH(it, end, groups) { // for each group
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GroupInfo& info = it->second;
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if(info.hastriggers) {
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FOREACH(it2, end2, info.triggers) { // for each trigger source
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const std::string& src = it2->first;
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GroupInfo::triggers_set_t& targets = it2->second;
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GroupInfo::members_map_t::iterator it2x = info.members_map.find(src);
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if(it2x==info.members_map.end()) {
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fprintf(stderr, "Group \"%s\" defines triggers from non-existant field \"%s\"\n",
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info.name.c_str(), src.c_str());
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continue;
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}
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GroupMemberInfo& srcmem = info.members[it2x->second];
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if(PDBProviderDebug>2)
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fprintf(stderr, " pdb trg '%s.%s' -> ",
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info.name.c_str(), src.c_str());
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FOREACH(it3, end3, targets) { // for each trigger target
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const std::string& target = *it3;
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if(target=="*") {
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for(size_t i=0; i<info.members.size(); i++) {
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srcmem.triggers.insert(i);
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if(PDBProviderDebug>2)
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fprintf(stderr, "%s, ", info.members[i].pvfldname.c_str());
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}
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} else {
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GroupInfo::members_map_t::iterator it3x = info.members_map.find(target);
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if(it3x==info.members_map.end()) {
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fprintf(stderr, "Group \"%s\" defines triggers to non-existant field \"%s\"\n",
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info.name.c_str(), target.c_str());
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continue;
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}
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const GroupMemberInfo& targetmem = info.members[it3x->second];
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// and finally, update source BitSet
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srcmem.triggers.insert(targetmem.index);
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if(PDBProviderDebug>2)
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fprintf(stderr, "%s, ", info.members[targetmem.index].pvfldname.c_str());
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}
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}
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if(PDBProviderDebug>2) fprintf(stderr, "\n");
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}
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} else {
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if(PDBProviderDebug>1) fprintf(stderr, " pdb default triggers for '%s'\n", info.name.c_str());
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FOREACH(it2, end2, info.members) {
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GroupMemberInfo& mem = *it2;
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mem.triggers.insert(mem.index); // default is self trigger
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}
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}
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}
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}
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PDBProcessor() : curgroup(NULL)
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{
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for(pdbRecordIterator rec; !rec.done(); rec.next())
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{
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const char *json = rec.info("Q:group");
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if(!json) continue;
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try {
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GroupConfig conf;
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GroupConfig::parse(json, conf);
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if(!conf.warning.empty())
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fprintf(stderr, "%s: warning(s) from info(Q:group, ...\n%s", rec.record()->name, conf.warning.c_str());
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recbase = rec.record()->name;
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recbase += ".";
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for(GroupConfig::groups_t::const_iterator git=conf.groups.begin(), gend=conf.groups.end();
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git!=gend; ++git)
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{
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const std::string& grpname = git->first;
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const GroupConfig::Group& grp = git->second;
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if(dbChannelTest(grpname.c_str())==0) {
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fprintf(stderr, "%s : Group name conflicts with record name. Ignoring...\n", grpname.c_str());
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continue;
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}
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groups_t::iterator it = groups.find(grpname);
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if(it==groups.end()) {
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// lazy creation of group
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std::pair<groups_t::iterator, bool> ins(groups.insert(std::make_pair(grpname, GroupInfo(grpname))));
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it = ins.first;
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}
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curgroup = &it->second;
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for(GroupConfig::Group::fields_t::const_iterator fit=grp.fields.begin(), fend=grp.fields.end();
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fit!=fend; ++fit)
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{
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const std::string& fldname = fit->first;
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const GroupConfig::Field& fld = fit->second;
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if(fld.channel.empty())
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throw std::runtime_error("Missing required +channel");
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GroupInfo::members_map_t::const_iterator oldgrp = curgroup->members_map.find(fldname);
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if(oldgrp!=curgroup->members_map.end()) {
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const GroupMemberInfo& other = curgroup->members[oldgrp->second];
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fprintf(stderr, "%s.%s ignoring duplicate mapping %s%s and %s\n",
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grpname.c_str(), fldname.c_str(),
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recbase.c_str(), fld.channel.c_str(),
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other.pvname.c_str());
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continue;
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}
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p2p::auto_ptr<PVIFBuilder> builder(PVIFBuilder::create(fld.type));
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curgroup->members.push_back(GroupMemberInfo(recbase + fld.channel, fldname, builder));
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curgroup->members.back().index = curgroup->members.size()-1;
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curgroup->members_map[fldname] = curgroup->members.back().index;
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if(PDBProviderDebug>2) {
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fprintf(stderr, " pdb map '%s.%s' <-> '%s'\n",
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curgroup->name.c_str(),
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curgroup->members.back().pvfldname.c_str(),
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curgroup->members.back().pvname.c_str());
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}
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if(!fld.trigger.empty()) {
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GroupInfo::triggers_t::iterator it = curgroup->triggers.find(fldname);
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if(it==curgroup->triggers.end()) {
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std::pair<GroupInfo::triggers_t::iterator, bool> ins(curgroup->triggers.insert(
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std::make_pair(fldname, GroupInfo::triggers_set_t())));
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it = ins.first;
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}
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Splitter sep(fld.trigger.c_str(), ',');
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std::string target;
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while(sep.snip(target)) {
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curgroup->hastriggers = true;
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it->second.insert(target);
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}
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}
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}
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if(grp.atomic_set) {
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GroupInfo::tribool V = grp.atomic ? GroupInfo::True : GroupInfo::False;
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if(curgroup->atomic!=GroupInfo::Unset && curgroup->atomic!=V)
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fprintf(stderr, " pdb atomic setting inconsistent '%s'\n",
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curgroup->name.c_str());
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curgroup->atomic=V;
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if(PDBProviderDebug>2)
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fprintf(stderr, " pdb atomic '%s' %s\n",
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curgroup->name.c_str(), curgroup->atomic ? "YES" : "NO");
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}
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}
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}catch(std::exception& e){
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fprintf(stderr, "%s: Error parsing info(\"Q:group\", ... : %s\n",
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rec.record()->name, e.what());
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}
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}
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resolveTriggers();
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}
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};
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}
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size_t PDBProvider::num_instances;
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PDBProvider::PDBProvider(const epics::pvAccess::Configuration::shared_pointer &)
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{
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PDBProcessor proc;
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pvd::FieldCreatePtr fcreate(pvd::getFieldCreate());
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pvd::PVDataCreatePtr pvbuilder(pvd::getPVDataCreate());
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pvd::StructureConstPtr _options(fcreate->createFieldBuilder()
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->addNestedStructure("_options")
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->add("queueSize", pvd::pvUInt)
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->add("atomic", pvd::pvBoolean)
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->endNested()
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->createStructure());
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#ifdef USE_MULTILOCK
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// assemble group PVD structure definitions and build dbLockers
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FOREACH(it, end, proc.groups)
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{
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GroupInfo &info=it->second;
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try{
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if(persist_pv_map.find(info.name)!=persist_pv_map.end())
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throw std::runtime_error("name already in used");
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const size_t nchans = info.members.size();
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PDBGroupPV::shared_pointer pv(new PDBGroupPV());
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pv->weakself = pv;
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pv->name = info.name;
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pv->pgatomic = info.atomic!=GroupInfo::False; // default true if Unset
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pv->monatomic = info.hastriggers;
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pvd::shared_vector<PDBGroupPV::Info> members(nchans);
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std::vector<dbCommon*> records(nchans);
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pvd::FieldBuilderPtr builder(fcreate->createFieldBuilder());
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builder->add("record", _options);
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for(size_t i=0; i<nchans; i++)
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{
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GroupMemberInfo &mem = info.members[i];
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PDBGroupPV::Info& info = members[i];
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DBCH chan(mem.pvname);
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info.builder = PTRMOVE(mem.builder);
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assert(info.builder.get());
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if(info.builder->buildsType) {
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std::vector<std::string> parts;
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{
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Splitter S(mem.pvfldname.c_str(), '.');
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std::string part;
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while(S.snip(part))
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parts.push_back(part);
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}
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assert(!parts.empty());
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for(size_t j=0; j<parts.size()-1; j++)
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builder = builder->addNestedStructure(parts[j]);
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builder->add(parts.back(), info.builder->dtype(chan));
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for(size_t j=0; j<parts.size()-1; j++)
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builder = builder->endNested();
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}
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info.attachment = mem.pvfldname;
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info.chan.swap(chan);
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info.triggers.reserve(mem.triggers.size());
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FOREACH(idx, endidx, mem.triggers) {
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info.triggers.push_back(*idx);
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}
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assert(info.chan);
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records[i] = dbChannelRecord(info.chan);
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}
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pv->members.swap(members);
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pv->fielddesc = builder->createStructure();
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pv->complete = pvbuilder->createPVStructure(pv->fielddesc);
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pv->complete->getSubFieldT<pvd::PVBoolean>("record._options.atomic")->put(pv->monatomic);
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DBManyLock L(&records[0], records.size(), 0);
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pv->locker.swap(L);
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for(size_t i=0; i<nchans; i++)
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{
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PDBGroupPV::Info& info = pv->members[i];
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if(info.triggers.empty()) continue;
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std::vector<dbCommon*> trig_records(info.triggers.size());
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for(size_t idx=0; idx<trig_records.size(); idx++) {
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trig_records[idx] = records[info.triggers[idx]];
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}
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DBManyLock L(&trig_records[0], trig_records.size(), 0);
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info.locker.swap(L);
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}
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persist_pv_map[info.name] = pv;
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}catch(std::exception& e){
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fprintf(stderr, "%s: Error Group not created: %s\n", info.name.c_str(), e.what());
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}
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}
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#else
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if(!proc.groups.empty()) {
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fprintf(stderr, "Group(s) were defined, but need Base >=3.16.0.2 to function. Ignoring.\n");
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}
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#endif // USE_MULTILOCK
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event_context = db_init_events();
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if(!event_context)
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throw std::runtime_error("Failed to create dbEvent context");
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int ret = db_start_events(event_context, "PDB-event", NULL, NULL, epicsThreadPriorityCAServerLow-1);
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if(ret!=DB_EVENT_OK)
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throw std::runtime_error("Failed to stsart dbEvent context");
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// setup group monitors
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try {
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#ifdef USE_MULTILOCK
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FOREACH(it, end, persist_pv_map)
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{
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const PDBPV::shared_pointer& ppv = it->second;
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PDBGroupPV *pv = dynamic_cast<PDBGroupPV*>(ppv.get());
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if(!pv)
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continue;
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// prepare for monitor
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size_t i=0;
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FOREACH(it, end, pv->members)
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{
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PDBGroupPV::Info& info = *it;
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info.evt_VALUE.index = info.evt_PROPERTY.index = i++;
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info.evt_VALUE.self = info.evt_PROPERTY.self = pv;
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info.pvif.reset(info.builder->attach(info.chan,
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pv->complete->getSubFieldT(info.attachment)));
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info.evt_PROPERTY.create(event_context, info.chan, &pdb_group_event, DBE_PROPERTY);
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if(!info.triggers.empty()) {
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info.evt_VALUE.create(event_context, info.chan, &pdb_group_event, DBE_VALUE|DBE_ALARM);
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}
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}
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}
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#endif // USE_MULTILOCK
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}catch(...){
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db_close_events(event_context);
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// TODO, remove PV and continue?
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throw;
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}
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epics::atomic::increment(num_instances);
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}
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PDBProvider::~PDBProvider()
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{
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epics::atomic::decrement(num_instances);
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destroy();
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}
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void PDBProvider::destroy()
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{
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dbEventCtx ctxt = NULL;
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persist_pv_map_t ppv;
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{
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epicsGuard<epicsMutex> G(transient_pv_map.mutex());
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persist_pv_map.swap(ppv);
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std::swap(ctxt, event_context);
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}
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ppv.clear(); // indirectly calls all db_cancel_events()
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if(ctxt) db_close_events(ctxt);
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}
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std::string PDBProvider::getProviderName() { return "PDBProvider"; }
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namespace {
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struct ChannelFindRequesterNOOP : public pva::ChannelFind
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{
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const pva::ChannelProvider::weak_pointer provider;
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ChannelFindRequesterNOOP(const pva::ChannelProvider::shared_pointer& prov) : provider(prov) {}
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virtual ~ChannelFindRequesterNOOP() {}
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virtual void destroy() {}
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virtual std::tr1::shared_ptr<pva::ChannelProvider> getChannelProvider() { return provider.lock(); }
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virtual void cancel() {}
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};
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}
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pva::ChannelFind::shared_pointer
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PDBProvider::channelFind(const std::string &channelName, const pva::ChannelFindRequester::shared_pointer &requester)
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{
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pva::ChannelFind::shared_pointer ret(new ChannelFindRequesterNOOP(shared_from_this()));
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bool found = false;
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{
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epicsGuard<epicsMutex> G(transient_pv_map.mutex());
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if(persist_pv_map.find(channelName)!=persist_pv_map.end()
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|| transient_pv_map.find(channelName)
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|| dbChannelTest(channelName.c_str())==0)
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found = true;
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}
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requester->channelFindResult(pvd::Status(), ret, found);
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return ret;
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}
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pva::ChannelFind::shared_pointer
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PDBProvider::channelList(pva::ChannelListRequester::shared_pointer const & requester)
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{
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pva::ChannelFind::shared_pointer ret;
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requester->channelListResult(pvd::Status(pvd::Status::STATUSTYPE_ERROR, "not supported"),
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ret, pvd::PVStringArray::const_svector(), true);
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return ret;
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}
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pva::Channel::shared_pointer
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PDBProvider::createChannel(std::string const & channelName,
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pva::ChannelRequester::shared_pointer const & channelRequester,
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short priority)
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{
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return createChannel(channelName, channelRequester, priority, "???");
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}
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pva::Channel::shared_pointer
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PDBProvider::createChannel(std::string const & channelName,
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pva::ChannelRequester::shared_pointer const & requester,
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short priority, std::string const & address)
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{
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pva::Channel::shared_pointer ret;
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PDBPV::shared_pointer pv;
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pvd::Status status;
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{
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epicsGuard<epicsMutex> G(transient_pv_map.mutex());
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pv = transient_pv_map.find(channelName);
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if(!pv) {
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persist_pv_map_t::const_iterator it=persist_pv_map.find(channelName);
|
|
if(it!=persist_pv_map.end()) {
|
|
pv = it->second;
|
|
}
|
|
}
|
|
if(!pv) {
|
|
dbChannel *pchan = dbChannelCreate(channelName.c_str());
|
|
if(pchan) {
|
|
DBCH chan(pchan);
|
|
pv.reset(new PDBSinglePV(chan, shared_from_this()));
|
|
transient_pv_map.insert(channelName, pv);
|
|
PDBSinglePV::shared_pointer spv = std::tr1::static_pointer_cast<PDBSinglePV>(pv);
|
|
spv->weakself = spv;
|
|
spv->activate();
|
|
}
|
|
}
|
|
}
|
|
if(pv) {
|
|
ret = pv->connect(shared_from_this(), requester);
|
|
}
|
|
if(!ret) {
|
|
status = pvd::Status(pvd::Status::STATUSTYPE_ERROR, "not found");
|
|
}
|
|
requester->channelCreated(status, ret);
|
|
return ret;
|
|
}
|