/* -*- Mode: C++; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
 *     Copyright 2011-2020 Couchbase, Inc.
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 */
#define NOMINMAX // Because MS' CRT headers #define min and max :(
#include "config.h"
#include <sys/types.h>
#include <libcouchbase/couchbase.h>
#include <cerrno>
#include <iostream>
#include <queue>
#include <list>
#include <cstring>
#include <cstdio>
#include <cstdlib>
#include <fstream>
#include <csignal>
#ifndef WIN32
#include <pthread.h>
#include <libcouchbase/metrics.h>
#else
#define usleep(n) Sleep(n / 1000)
#endif
#include <cstdarg>
#include <exception>
#include <stdexcept>
#include "common/options.h"
#include "common/histogram.h"

#include "docgen/seqgen.h"
#include "docgen/docgen.h"
#include "internalstructs.h"

using namespace std;
using namespace cbc;
using namespace cliopts;
using namespace Pillowfight;
using std::string;
using std::vector;

// Deprecated options which still exist from previous versions.
struct DeprecatedOptions {
    UIntOption iterations;
    UIntOption instances;
    BoolOption loop;

    DeprecatedOptions() : iterations("iterations"), instances("num-instances"), loop("loop")
    {
        iterations.abbrev('i').hide().setDefault(1000);
        instances.abbrev('Q').hide().setDefault(1);
        loop.abbrev('l').hide().setDefault(false);
    }

    void addOptions(Parser &p)
    {
        p.addOption(instances);
        p.addOption(loop);
        p.addOption(iterations);
    }
};

static TemplateSpec parseTemplateSpec(const string &input)
{
    TemplateSpec spec;
    // Just need to find the path
    size_t endpos = input.find(',');
    if (endpos == string::npos) {
        throw std::runtime_error("invalid template spec: need field,min,max");
    }
    spec.term = input.substr(0, endpos);
    unsigned is_sequential = 0;
    int rv = sscanf(input.c_str() + endpos + 1, "%u,%u,%u", &spec.minval, &spec.maxval, &is_sequential);
    if (rv < 2) {
        throw std::runtime_error("invalid template spec: need field,min,max");
    }
    spec.sequential = is_sequential;
    if (spec.minval > spec.maxval) {
        throw std::runtime_error("min cannot be higher than max");
    }
    return spec;
}

class Configuration
{
  public:
    Configuration()
        : o_multiSize("batch-size"), o_numItems("num-items"), o_keyPrefix("key-prefix"), o_numThreads("num-threads"),
          o_randSeed("random-seed"), o_randomBody("random-body"), o_setPercent("set-pct"), o_minSize("min-size"),
          o_maxSize("max-size"), o_noPopulate("no-population"), o_numCycles("num-cycles"), o_sequential("sequential"),
          o_startAt("start-at"), o_rateLimit("rate-limit"), o_userdocs("docs"), o_writeJson("json"),
          o_templatePairs("template"), o_subdoc("subdoc"), o_noop("noop"), o_sdPathCount("pathcount"),
          o_populateOnly("populate-only"), o_exptime("expiry"), o_collection("collection"), o_durability("durability"),
          o_persist("persist-to"), o_replicate("replicate-to"), o_lock("lock")
    {
        o_multiSize.setDefault(100).abbrev('B').description("Number of operations to batch");
        o_numItems.setDefault(1000).abbrev('I').description("Number of items to operate on");
        o_keyPrefix.abbrev('p').description("key prefix to use");
        o_numThreads.setDefault(1).abbrev('t').description("The number of threads to use");
        o_randSeed.setDefault(0).abbrev('s').description("Specify random seed").hide();
        o_randomBody.setDefault(false).abbrev('R').description(
            "Randomize document body (otherwise use 'x' and '*' to fill)");
        o_setPercent.setDefault(33).abbrev('r').description("The percentage of operations which should be mutations");
        o_minSize.setDefault(50).abbrev('m').description("Set minimum payload size");
        o_maxSize.setDefault(5120).abbrev('M').description("Set maximum payload size");
        o_noPopulate.setDefault(false).abbrev('n').description("Skip population");
        o_numCycles.setDefault(-1).abbrev('c').description(
            "Number of cycles to be run until exiting. Set to -1 to loop infinitely");
        o_sequential.setDefault(false).description("Use sequential access (instead of random)");
        o_startAt.setDefault(0).description("For sequential access, set the first item");
        o_rateLimit.setDefault(0).description("Set operations per second limit (per thread)");
        o_userdocs.description("User documents to load (overrides --min-size and --max-size");
        o_writeJson.abbrev('J').description("Enable writing JSON values (rather than bytes)");
        o_templatePairs.description("Values for templates to be inserted into user documents");
        o_templatePairs.argdesc("FIELD,MIN,MAX[,SEQUENTIAL]").hide();
        o_subdoc.description("Use subdoc instead of fulldoc operations");
        o_noop.description("Use NOOP instead of document operations").setDefault(false);
        o_sdPathCount.description("Number of subdoc paths per command").setDefault(1);
        o_populateOnly.description("Exit after documents have been populated");
        o_exptime.description("Set TTL for items").abbrev('e');
        o_collection.description("Allowed collection full path including scope (could be specified multiple times)");
        o_durability.abbrev('d').description("Durability level").setDefault("none");
        o_persist.description("Wait until item is persisted to this number of nodes (-1 for master+replicas)")
            .setDefault(0);
        o_replicate.description("Wait until item is replicated to this number of nodes (-1 for all replicas)")
            .setDefault(0);
        o_lock.description("Lock keys for updates for given time (will not lock when set to zero)").setDefault(0);
        params.getTimings().description("Enable command timings (second time to dump timings automatically)");
    }

    DURABILITY_GETTER()

    void processOptions()
    {
        opsPerCycle = o_multiSize.result();
        prefix = o_keyPrefix.result();
        setprc = o_setPercent.result();
        shouldPopulate = !o_noPopulate.result();
        durabilityLevel = durability();
        persistTo = o_persist.result();
        replicateTo = o_replicate.result();
        lockTime = o_lock.result();
        if (lockTime && o_numItems < opsPerCycle * o_numThreads) {
            fprintf(stderr,
                    "The --num-items=%d cannot be smaller than --batch-size=%d multiplied to --num-thread=%d when used "
                    "with --lock=%d\n",
                    (int)o_numItems, (int)opsPerCycle, (int)o_numThreads, (int)lockTime);
            exit(EXIT_FAILURE);
        }

        if (depr.loop.passed()) {
            fprintf(stderr, "The --loop/-l option is deprecated. Use --num-cycles\n");
            maxCycles = -1;
        } else {
            maxCycles = o_numCycles.result();
        }

        if (o_populateOnly.passed()) {
            // Determine how many iterations are required.
            if (o_numCycles.passed()) {
                throw std::runtime_error("--num-cycles incompatible with --populate-only");
            }
            size_t est = (o_numItems / o_numThreads) / o_multiSize;
            while (est * o_numThreads * o_multiSize < o_numItems) {
                est++;
            }
            maxCycles = est;
            o_sequential.setDefault(true);
            fprintf(stderr, "Populating using %d cycles\n", maxCycles);
        }

        if (depr.iterations.passed()) {
            fprintf(stderr, "The --num-iterations/-I option is deprecated. Use --batch-size\n");
            opsPerCycle = depr.iterations.result();
        }

        vector<TemplateSpec> specs;
        vector<string> userdocs;

        if (o_templatePairs.passed()) {
            vector<string> specs_str = o_templatePairs.result();
            for (auto &ii : specs_str) {
                specs.push_back(parseTemplateSpec(ii));
            }
        }

        // Set the document sizes..
        if (o_userdocs.passed()) {
            if (o_minSize.passed() || o_maxSize.passed()) {
                fprintf(stderr, "--min-size/--max-size invalid with userdocs\n");
            }

            vector<string> filenames = o_userdocs.result();
            for (auto &filename : filenames) {
                std::stringstream ss;
                std::ifstream ifs(filename.c_str());
                if (!ifs.is_open()) {
                    perror(filename.c_str());
                    exit(EXIT_FAILURE);
                }
                ss << ifs.rdbuf();
                userdocs.push_back(ss.str());
            }
        }

        if (specs.empty()) {
            if (o_writeJson.result()) {
                docgen = new JsonDocGenerator(o_minSize.result(), o_maxSize.result(), o_randomBody.numSpecified());
            } else if (!userdocs.empty()) {
                docgen = new PresetDocGenerator(userdocs);
            } else {
                docgen = new RawDocGenerator(o_minSize.result(), o_maxSize.result(), o_randomBody.numSpecified());
            }
        } else {
            if (o_writeJson.result()) {
                if (userdocs.empty()) {
                    docgen = new PlaceholderJsonGenerator(o_minSize.result(), o_maxSize.result(), specs,
                                                          o_randomBody.numSpecified());
                } else {
                    docgen = new PlaceholderJsonGenerator(userdocs, specs);
                }
            } else {
                if (userdocs.empty()) {
                    throw std::runtime_error("Must provide documents with placeholders!");
                }
                docgen = new PlaceholderDocGenerator(userdocs, specs);
            }
        }

        sdOpsPerCmd = o_sdPathCount.result();
        if (o_sdPathCount.passed()) {
            o_subdoc.setDefault(true);
        }

        if (o_collection.passed()) {
            collections = o_collection.result();
        }
    }

    void addOptions(Parser &parser)
    {
        parser.addOption(o_multiSize);
        parser.addOption(o_numItems);
        parser.addOption(o_keyPrefix);
        parser.addOption(o_numThreads);
        parser.addOption(o_randSeed);
        parser.addOption(o_randomBody);
        parser.addOption(o_setPercent);
        parser.addOption(o_noPopulate);
        parser.addOption(o_minSize);
        parser.addOption(o_maxSize);
        parser.addOption(o_numCycles);
        parser.addOption(o_sequential);
        parser.addOption(o_startAt);
        parser.addOption(o_rateLimit);
        parser.addOption(o_userdocs);
        parser.addOption(o_writeJson);
        parser.addOption(o_templatePairs);
        parser.addOption(o_subdoc);
        parser.addOption(o_noop);
        parser.addOption(o_sdPathCount);
        parser.addOption(o_populateOnly);
        parser.addOption(o_exptime);
        parser.addOption(o_collection);
        parser.addOption(o_durability);
        parser.addOption(o_persist);
        parser.addOption(o_replicate);
        parser.addOption(o_lock);
        params.addToParser(parser);
        depr.addOptions(parser);
    }

    int numTimings()
    {
        return params.numTimings();
    }

    bool isLoopDone(size_t niter) const
    {
        if (maxCycles == -1) {
            return false;
        }
        return niter >= (size_t)maxCycles;
    }

    uint32_t getRandomSeed()
    {
        return o_randSeed;
    }
    uint32_t getNumThreads()
    {
        return o_numThreads;
    }
    string &getKeyPrefix()
    {
        return prefix;
    }
    bool sequentialAccess()
    {
        return o_sequential;
    }
    bool isSubdoc()
    {
        return o_subdoc;
    }
    bool isNoop()
    {
        return o_noop.result();
    }
    bool useCollections()
    {
        return o_collection.passed();
    }
    bool writeJson()
    {
        return o_writeJson.result();
    }
    unsigned firstKeyOffset()
    {
        return o_startAt;
    }
    uint32_t getNumItems()
    {
        return o_numItems;
    }
    uint32_t getRateLimit()
    {
        return o_rateLimit;
    }
    unsigned getExptime()
    {
        return o_exptime;
    }

    uint32_t opsPerCycle{};
    uint32_t sdOpsPerCmd{};
    unsigned setprc{};
    string prefix;
    volatile int maxCycles{};
    bool shouldPopulate{};
    ConnParams params;
    const DocGeneratorBase *docgen{};
    vector<string> collections{};
    lcb_DURABILITY_LEVEL durabilityLevel{LCB_DURABILITYLEVEL_NONE};
    int replicateTo{};
    int persistTo{};
    int lockTime{};

  private:
    UIntOption o_multiSize;
    UIntOption o_numItems;
    StringOption o_keyPrefix;
    UIntOption o_numThreads;
    UIntOption o_randSeed;
    BoolOption o_randomBody;
    UIntOption o_setPercent;
    UIntOption o_minSize;
    UIntOption o_maxSize;
    BoolOption o_noPopulate;
    IntOption o_numCycles;
    BoolOption o_sequential;
    UIntOption o_startAt;
    UIntOption o_rateLimit;

    // List of paths to user documents to load.. They should all be valid JSON
    ListOption o_userdocs;

    // Whether generated values should be JSON
    BoolOption o_writeJson;

    // List of template ranges for value generation
    ListOption o_templatePairs;
    BoolOption o_subdoc;
    BoolOption o_noop;
    UIntOption o_sdPathCount;

    // Compound option
    BoolOption o_populateOnly;

    UIntOption o_exptime;

    ListOption o_collection;
    StringOption o_durability;
    IntOption o_persist;
    IntOption o_replicate;

    IntOption o_lock;
    DeprecatedOptions depr;
} config;

void log(const char *format, ...)
{
    char buffer[512];
    va_list args;

    va_start(args, format);
    vsprintf(buffer, format, args);
    if (config.numTimings() > 0) {
        std::cerr << "[" << std::fixed << lcb_nstime() / 1000000000.0 << "] ";
    }
    std::cerr << buffer << std::endl;
    va_end(args);
}

extern "C" {
static void noopCallback(lcb_INSTANCE *, int, const lcb_RESPNOOP *);
static void subdocCallback(lcb_INSTANCE *, int, const lcb_RESPSUBDOC *);
static void getCallback(lcb_INSTANCE *, int, const lcb_RESPGET *);
static void storeCallback(lcb_INSTANCE *, int, const lcb_RESPSTORE *);
}

class ThreadContext;

class InstanceCookie
{
  public:
    explicit InstanceCookie(lcb_INSTANCE *instance)
    {
        lcb_set_cookie(instance, this);
        lastPrint = 0;
        if (config.numTimings() > 0) {
            hg.install(instance, stdout);
        }
        stats.total = 0;
        stats.retried = 0;
        stats.etmpfail = 0;
        stats.eexist = 0;
        stats.etimeout = 0;
    }

    static InstanceCookie *get(lcb_INSTANCE *instance)
    {
        return (InstanceCookie *)lcb_get_cookie(instance);
    }

    static void dumpTimings(lcb_INSTANCE *instance, const char *header = nullptr, bool force = false)
    {
        time_t now = time(nullptr);
        InstanceCookie *ic = get(instance);

        if (now - ic->lastPrint > 0) {
            ic->lastPrint = now;
        } else if (!force) {
            return;
        }

        Histogram &h = ic->hg;
        if (header) {
            printf("[%f %s]\n", lcb_nstime() / 1000000000.0, header);
        }
        printf("                +---------+---------+---------+---------+\n");
        h.write();
        printf("                +----------------------------------------\n");
    }

    void setContext(ThreadContext *context)
    {
        m_context = context;
    }

    ThreadContext *getContext()
    {
        return m_context;
    }

    struct {
        size_t total;
        size_t retried;
        size_t etmpfail;
        size_t eexist;
        size_t etimeout;
    } stats{};

  private:
    time_t lastPrint;
    Histogram hg;
    ThreadContext *m_context{};
};

struct NextOp {
    NextOp() : m_seqno(0), m_mode(GET), m_cas(0) {}

    string m_key;
    string m_scope;
    string m_collection;
    uint32_t m_seqno;
    vector<lcb_IOV> m_valuefrags;
    vector<SubdocSpec> m_specs;
    // The mode here is for future use with subdoc
    enum Mode { STORE, GET, SDSTORE, SDGET, NOOP };
    Mode m_mode;
    uint64_t m_cas;
};

class OpGenerator
{
  public:
    explicit OpGenerator(int id) : m_id(id) {}

    virtual ~OpGenerator() = default;

    virtual void setNextOp(NextOp &op) = 0;
    virtual void setValue(NextOp &op) = 0;
    virtual void populateIov(uint32_t, vector<lcb_IOV> &) = 0;
    virtual bool inPopulation() const = 0;
    virtual void checkin(uint32_t) = 0;
    virtual const char *getStageString() const = 0;

  protected:
    int m_id;
};

class NoopGenerator : public OpGenerator
{
  public:
    explicit NoopGenerator(int ix) : OpGenerator(ix) {}

    void setNextOp(NextOp &op) override
    {
        op.m_mode = NextOp::NOOP;
    }

    void setValue(NextOp &) override {}
    void populateIov(uint32_t, vector<lcb_IOV> &) override {}

    bool inPopulation() const override
    {
        return false;
    }

    void checkin(uint32_t) override {}

    const char *getStageString() const override
    {
        return "Run";
    }
};

/** Stateful, per-thread generator */
class KeyGenerator : public OpGenerator
{
  public:
    explicit KeyGenerator(int ix)
        : OpGenerator(ix), m_gencount(0), m_force_sequential(false), m_in_population(config.shouldPopulate)
    {
        srand(config.getRandomSeed());

        m_genrandom = new SeqGenerator(config.firstKeyOffset(), config.getNumItems() + config.firstKeyOffset());

        m_gensequence = new SeqGenerator(config.firstKeyOffset(), config.getNumItems() + config.firstKeyOffset(),
                                         config.getNumThreads(), ix);

        if (m_in_population) {
            m_force_sequential = true;
        } else {
            m_force_sequential = config.sequentialAccess();
        }

        m_local_genstate = config.docgen->createState(config.getNumThreads(), ix);
        if (config.isSubdoc()) {
            m_mode_read = NextOp::SDGET;
            m_mode_write = NextOp::SDSTORE;
            m_sdgenstate = config.docgen->createSubdocState(config.getNumThreads(), ix);
            if (!m_sdgenstate) {
                std::cerr << "Current generator does not support subdoc. Did you try --json?" << std::endl;
                exit(EXIT_FAILURE);
            }
        } else {
            m_mode_read = NextOp::GET;
            m_mode_write = NextOp::STORE;
        }
    }

    void setValue(NextOp &op) override
    {
        m_local_genstate->populateIov(op.m_seqno, op.m_valuefrags);
    }

    void populateIov(uint32_t seq, vector<lcb_IOV> &iov_out) override
    {
        m_local_genstate->populateIov(seq, iov_out);
    }

    void setNextOp(NextOp &op) override
    {
        bool store_override = false;

        if (m_in_population) {
            if (m_gencount++ < m_gensequence->maxItems()) {
                store_override = true;
            } else {
                printf("Thread %d has finished populating.\n", m_id);
                m_in_population = false;
                m_force_sequential = config.sequentialAccess();
            }
        }

        if (m_in_population || !config.lockTime) {
            op.m_seqno = (m_force_sequential ? m_gensequence : m_genrandom)->next();
        } else {
            op.m_seqno = (m_force_sequential ? m_gensequence : m_genrandom)->checkout();
        }

        if (store_override) {
            // Populate
            op.m_mode = NextOp::STORE;
            setValue(op);

        } else if (shouldStore(op.m_seqno)) {
            op.m_mode = m_mode_write;
            if (op.m_mode == NextOp::STORE) {
                setValue(op);
            } else if (op.m_mode == NextOp::SDSTORE) {
                op.m_specs.resize(config.sdOpsPerCmd);
                m_sdgenstate->populateMutate(op.m_seqno, op.m_specs);
            } else {
                fprintf(stderr, "Invalid mode for op: %d\n", op.m_mode);
                abort();
            }
        } else {
            op.m_mode = m_mode_read;
            if (op.m_mode == NextOp::SDGET) {
                op.m_specs.resize(config.sdOpsPerCmd);
                m_sdgenstate->populateLookup(op.m_seqno, op.m_specs);
            }
        }

        generateKey(op);
    }

    bool inPopulation() const override
    {
        return m_in_population;
    }

    void checkin(uint32_t seqno) override
    {
        (m_force_sequential ? m_gensequence : m_genrandom)->checkin(seqno);
    }

    const char *getStageString() const override
    {
        if (m_in_population) {
            return "Populate";
        } else {
            return "Run";
        }
    }

  private:
    static bool shouldStore(uint32_t seqno)
    {
        if (config.setprc == 0) {
            return false;
        }

        float seqno_f = seqno % 100;
        float pct_f = seqno_f / config.setprc;
        return pct_f < 1;
    }

    static void generateKey(NextOp &op)
    {
        uint32_t seqno = op.m_seqno;
        char buffer[21];
        snprintf(buffer, sizeof(buffer), "%020d", seqno);
        op.m_key.assign(config.getKeyPrefix() + buffer);
        if (config.useCollections()) {
            std::string &path = config.collections[seqno % config.collections.size()];
            size_t dot = path.find('.');
            if (dot != std::string::npos) {
                op.m_scope = path.substr(0, dot);
                op.m_collection = path.substr(dot + 1);
            }
        }
    }

    SeqGenerator *m_genrandom;
    SeqGenerator *m_gensequence;
    size_t m_gencount;

    bool m_force_sequential;
    bool m_in_population;
    NextOp::Mode m_mode_read;
    NextOp::Mode m_mode_write;
    GeneratorState *m_local_genstate;
    SubdocGeneratorState *m_sdgenstate;
};

#define OPFLAGS_LOCKED 0x01

class ThreadContext
{
  public:
    ThreadContext(lcb_INSTANCE *handle, int ix) : niter(0), instance(handle)
    {
        if (config.isNoop()) {
            gen = new NoopGenerator(ix);
        } else {
            gen = new KeyGenerator(ix);
        }
    }

    ~ThreadContext()
    {
        delete gen;
        gen = nullptr;
    }

    bool inPopulation()
    {
        return gen && (gen->inPopulation() || !retryq.empty());
    }

    void checkin(uint32_t seqno)
    {
        if (gen) {
            gen->checkin(seqno);
        }
    }

    void singleLoop()
    {
        bool hasItems = false;

        lcb_sched_enter(instance);
        for (size_t ii = 0; ii < config.opsPerCycle; ++ii) {
            hasItems = scheduleNextOperation();
        }
        if (hasItems) {
            error = LCB_SUCCESS;
            lcb_sched_leave(instance);
            lcb_wait(instance, LCB_WAIT_DEFAULT);
        } else {
            lcb_sched_fail(instance);
        }
        purgeRetryQueue();
    }

    void purgeRetryQueue()
    {
        NextOp opinfo;
        InstanceCookie *cookie = InstanceCookie::get(instance);

        while (!retryq.empty()) {
            unsigned exptime = config.getExptime();
            lcb_sched_enter(instance);
            while (!retryq.empty()) {
                opinfo = retryq.front();
                retryq.pop();
                lcb_CMDSTORE *scmd;
                lcb_cmdstore_create(&scmd, LCB_STORE_UPSERT);
                lcb_cmdstore_expiry(scmd, exptime);
                if (config.writeJson()) {
                    lcb_cmdstore_datatype(scmd, LCB_VALUE_F_JSON);
                }
                lcb_cmdstore_key(scmd, opinfo.m_key.c_str(), opinfo.m_key.size());
                if (config.useCollections()) {
                    if (!opinfo.m_collection.empty() || !opinfo.m_scope.empty()) {
                        lcb_cmdstore_collection(scmd, opinfo.m_scope.c_str(), opinfo.m_scope.size(),
                                                opinfo.m_collection.c_str(), opinfo.m_collection.size());
                    }
                }

                lcb_cmdstore_value_iov(scmd, &opinfo.m_valuefrags[0], opinfo.m_valuefrags.size());
                if (config.durabilityLevel != LCB_DURABILITYLEVEL_NONE) {
                    lcb_cmdstore_durability(scmd, config.durabilityLevel);
                } else if (config.persistTo > 0 || config.replicateTo > 0) {
                    lcb_cmdstore_durability_observe(scmd, config.persistTo, config.replicateTo);
                }
                error = lcb_store(instance, nullptr, scmd);
                lcb_cmdstore_destroy(scmd);
                cookie->stats.retried++;
            }
            lcb_sched_leave(instance);
            lcb_wait(instance, LCB_WAIT_DEFAULT);
            if (error != LCB_SUCCESS) {
                log("Operation(s) failed: %s", lcb_strerror_long(error));
            }
        }
    }

    bool scheduleNextOperation()
    {
        NextOp opinfo;
        unsigned exptime = config.getExptime();
        gen->setNextOp(opinfo);

        switch (opinfo.m_mode) {
            case NextOp::STORE: {
                if (!gen->inPopulation() && config.lockTime > 0) {
                    lcb_CMDGET *gcmd;
                    lcb_cmdget_create(&gcmd);
                    lcb_cmdget_key(gcmd, opinfo.m_key.c_str(), opinfo.m_key.size());
                    lcb_cmdget_locktime(gcmd, config.lockTime);
                    error = lcb_get(instance, (void *)OPFLAGS_LOCKED, gcmd);
                    lcb_cmdget_destroy(gcmd);
                } else {
                    lcb_CMDSTORE *scmd;
                    lcb_cmdstore_create(&scmd, LCB_STORE_UPSERT);
                    lcb_cmdstore_expiry(scmd, exptime);
                    if (config.writeJson()) {
                        lcb_cmdstore_datatype(scmd, LCB_VALUE_F_JSON);
                    }
                    lcb_cmdstore_key(scmd, opinfo.m_key.c_str(), opinfo.m_key.size());
                    if (config.useCollections()) {
                        if (!opinfo.m_collection.empty() || !opinfo.m_scope.empty()) {
                            lcb_cmdstore_collection(scmd, opinfo.m_scope.c_str(), opinfo.m_scope.size(),
                                                    opinfo.m_collection.c_str(), opinfo.m_collection.size());
                        }
                    }
                    lcb_cmdstore_value_iov(scmd, &opinfo.m_valuefrags[0], opinfo.m_valuefrags.size());
                    if (config.durabilityLevel != LCB_DURABILITYLEVEL_NONE) {
                        lcb_cmdstore_durability(scmd, config.durabilityLevel);
                    } else if (config.persistTo > 0 || config.replicateTo > 0) {
                        lcb_cmdstore_durability_observe(scmd, config.persistTo, config.replicateTo);
                    }
                    error = lcb_store(instance, nullptr, scmd);
                    lcb_cmdstore_destroy(scmd);
                }
                break;
            }
            case NextOp::GET: {
                lcb_CMDGET *gcmd;
                lcb_cmdget_create(&gcmd);
                lcb_cmdget_key(gcmd, opinfo.m_key.c_str(), opinfo.m_key.size());
                if (config.useCollections()) {
                    if (!opinfo.m_collection.empty() || !opinfo.m_scope.empty()) {
                        lcb_cmdget_collection(gcmd, opinfo.m_scope.c_str(), opinfo.m_scope.size(),
                                              opinfo.m_collection.c_str(), opinfo.m_collection.size());
                    }
                }
                lcb_cmdget_expiry(gcmd, exptime);
                error = lcb_get(instance, this, gcmd);
                lcb_cmdget_destroy(gcmd);
                break;
            }
            case NextOp::SDSTORE:
            case NextOp::SDGET: {
                lcb_SUBDOCSPECS *specs;
                bool mutate = false;
                lcb_subdocspecs_create(&specs, opinfo.m_specs.size());
                for (size_t ii = 0; ii < opinfo.m_specs.size(); ii++) {
                    SubdocSpec &spec = opinfo.m_specs[ii];
                    if (spec.mutate) {
                        mutate = true;
                        lcb_subdocspecs_dict_upsert(specs, ii, 0, spec.path.c_str(), spec.path.size(),
                                                    spec.value.c_str(), spec.value.size());
                    } else {
                        lcb_subdocspecs_get(specs, ii, 0, spec.path.c_str(), spec.path.size());
                    }
                }
                lcb_CMDSUBDOC *sdcmd;
                lcb_cmdsubdoc_create(&sdcmd);
                if (opinfo.m_mode == NextOp::SDSTORE) {
                    lcb_cmdsubdoc_expiry(sdcmd, exptime);
                }
                lcb_cmdsubdoc_key(sdcmd, opinfo.m_key.c_str(), opinfo.m_key.size());
                if (config.useCollections()) {
                    if (!opinfo.m_collection.empty() || !opinfo.m_scope.empty()) {
                        lcb_cmdsubdoc_collection(sdcmd, opinfo.m_scope.c_str(), opinfo.m_scope.size(),
                                                 opinfo.m_collection.c_str(), opinfo.m_collection.size());
                    }
                }
                if (mutate && config.durabilityLevel != LCB_DURABILITYLEVEL_NONE) {
                    lcb_cmdsubdoc_durability(sdcmd, config.durabilityLevel);
                }
                error = lcb_subdoc(instance, nullptr, sdcmd);
                lcb_subdocspecs_destroy(specs);
                lcb_cmdsubdoc_destroy(sdcmd);
                break;
            }
            case NextOp::NOOP: {
                lcb_CMDNOOP ncmd = {0};
                error = lcb_noop3(instance, nullptr, &ncmd);
                break;
            }
        }

        if (error != LCB_SUCCESS) {
            log("Failed to schedule operation: %s", lcb_strerror_long(error));
            return false;
        } else {
            return true;
        }
    }

    bool run()
    {
        do {
            singleLoop();

            if (config.numTimings() > 1) {
                InstanceCookie::dumpTimings(instance, gen->getStageString());
            }
            if (config.params.shouldDump()) {
                lcb_dump(instance, stderr, LCB_DUMP_ALL);
            }
            if (config.getRateLimit() > 0) {
                rateLimitThrottle();
            }

        } while (!config.isLoopDone(++niter));

        if (config.numTimings() > 1) {
            InstanceCookie::dumpTimings(instance, gen->getStageString(), true);
        }
        return true;
    }

    void retry(NextOp &op)
    {
        if (op.m_mode == NextOp::STORE) {
            gen->setValue(op);
        }
        retryq.push(op);
    }

    void populateIov(uint32_t seq, vector<lcb_IOV> &iov_out)
    {
        gen->populateIov(seq, iov_out);
    }

#ifndef WIN32
    pthread_t thr{};
#endif

    lcb_INSTANCE *getInstance()
    {
        return instance;
    }

  protected:
    // the callback methods needs to be able to set the error handler..
    friend void noopCallback(lcb_INSTANCE *, int, const lcb_RESPNOOP *);
    friend void subdocCallback(lcb_INSTANCE *, int, const lcb_RESPSUBDOC *);
    friend void getCallback(lcb_INSTANCE *, int, const lcb_RESPGET *);
    friend void storeCallback(lcb_INSTANCE *, int, const lcb_RESPSTORE *);

    Histogram histogram;

    void setError(lcb_STATUS e)
    {
        error = e;
    }

  private:
    static void rateLimitThrottle()
    {
        lcb_U64 now = lcb_nstime();
        static lcb_U64 previous_time = now;

        const lcb_U64 elapsed_ns = now - previous_time;
        const lcb_U64 wanted_duration_ns = (config.getNumThreads() * config.opsPerCycle * 1e9) / config.getRateLimit();
        // On first invocation no previous_time, so skip attempting to sleep.
        if (elapsed_ns > 0 && elapsed_ns < wanted_duration_ns) {
            // Dampen the sleep time by averaging with the previous
            // sleep time.
            static lcb_U64 last_sleep_ns = 0;
            const lcb_U64 sleep_ns = (last_sleep_ns + wanted_duration_ns - elapsed_ns) / 2;
            usleep(sleep_ns / 1000);
            now += sleep_ns;
            last_sleep_ns = sleep_ns;
        }
        previous_time = now;
    }

    OpGenerator *gen;
    size_t niter;
    lcb_STATUS error{LCB_SUCCESS};
    lcb_INSTANCE *instance{nullptr};
    std::queue<NextOp> retryq{};
};

static void updateOpsPerSecDisplay()
{

    static time_t start_time = time(nullptr);
    static int is_tty =
#ifdef WIN32
        0;
#else
        isatty(STDERR_FILENO);
#endif
    static volatile unsigned long nops = 0;
    time_t now = time(nullptr);
    time_t nsecs = now - start_time;
    if (!nsecs) {
        nsecs = 1;
    }
    unsigned long ops_sec = nops / nsecs;
    if (++nops % 10000 == 0) {
        fprintf(stderr, "OPS/SEC: %10lu%c", ops_sec, is_tty ? '\r' : '\n');
    }
}

static void updateStats(InstanceCookie *cookie, lcb_STATUS rc)
{
    cookie->stats.total++;
    switch (rc) {
        case LCB_ERR_TEMPORARY_FAILURE:
            cookie->stats.etmpfail++;
            break;
        case LCB_ERR_DOCUMENT_EXISTS:
            cookie->stats.eexist++;
            break;
        case LCB_ERR_TIMEOUT:
            cookie->stats.etimeout++;
            break;
        default:
            break;
    }
}

static void noopCallback(lcb_INSTANCE *instance, int, const lcb_RESPNOOP *resp)
{
    InstanceCookie *cookie = InstanceCookie::get(instance);
    ThreadContext *tc = cookie->getContext();
    tc->setError(resp->ctx.rc);
    updateStats(cookie, resp->ctx.rc);
    updateOpsPerSecDisplay();
}

static void subdocCallback(lcb_INSTANCE *instance, int, const lcb_RESPSUBDOC *resp)
{
    InstanceCookie *cookie = InstanceCookie::get(instance);
    ThreadContext *tc = cookie->getContext();
    lcb_STATUS rc = lcb_respsubdoc_status(resp);
    tc->setError(rc);
    updateStats(cookie, rc);

    const char *p;
    size_t n;
    lcb_respsubdoc_key(resp, &p, &n);
    (void)n;
    tc->checkin(std::strtol(p, nullptr, 10));
    updateOpsPerSecDisplay();
}

static void getCallback(lcb_INSTANCE *instance, int, const lcb_RESPGET *resp)
{
    InstanceCookie *cookie = InstanceCookie::get(instance);
    ThreadContext *tc = cookie->getContext();
    lcb_STATUS rc = lcb_respget_status(resp);
    tc->setError(rc);
    updateStats(cookie, rc);

    bool done = true;
    const char *p;
    size_t n;
    lcb_respget_key(resp, &p, &n);
    string key(p, n);

    const lcb_KEY_VALUE_ERROR_CONTEXT *ctx;
    lcb_respget_error_context(resp, &ctx);
    string scope;
    lcb_errctx_kv_scope(ctx, &p, &n);
    if (p && n) {
        scope.assign(p, n);
    }
    string collection;
    lcb_errctx_kv_collection(ctx, &p, &n);
    if (p && n) {
        collection.assign(p, n);
    }

    uint32_t seqno = std::stol(key);
    uintptr_t flags = 0;
    lcb_respget_cookie(resp, (void **)&flags);
    if (flags & OPFLAGS_LOCKED) {
        if (rc == LCB_SUCCESS) {
            vector<lcb_IOV> valuefrags;
            tc->populateIov(seqno, valuefrags);

            lcb_CMDSTORE *scmd;
            lcb_cmdstore_create(&scmd, LCB_STORE_UPSERT);
            lcb_cmdstore_expiry(scmd, config.getExptime());
            uint64_t cas;
            lcb_respget_cas(resp, &cas);
            lcb_cmdstore_cas(scmd, cas);
            if (config.writeJson()) {
                lcb_cmdstore_datatype(scmd, LCB_VALUE_F_JSON);
            }
            lcb_cmdstore_key(scmd, key.c_str(), key.size());
            if (config.useCollections()) {
                if (!collection.empty() || !scope.empty()) {
                    lcb_cmdstore_collection(scmd, scope.c_str(), scope.size(), collection.c_str(), collection.size());
                }
            }
            lcb_cmdstore_value_iov(scmd, &valuefrags[0], valuefrags.size());
            if (config.durabilityLevel != LCB_DURABILITYLEVEL_NONE) {
                lcb_cmdstore_durability(scmd, config.durabilityLevel);
            } else if (config.persistTo > 0 || config.replicateTo > 0) {
                lcb_cmdstore_durability_observe(scmd, config.persistTo, config.replicateTo);
            }
            lcb_store(instance, nullptr, scmd);
            lcb_cmdstore_destroy(scmd);

            done = false;
        } else if (rc == LCB_ERR_TEMPORARY_FAILURE) {
            NextOp op;
            op.m_mode = NextOp::STORE;
            op.m_key = key;
            op.m_seqno = seqno;
            op.m_scope = scope;
            op.m_collection = collection;
            tc->retry(op);
            done = false;
        }
    }

    if (done) {
        tc->checkin(seqno);
    }
    updateOpsPerSecDisplay();
}

static void storeCallback(lcb_INSTANCE *instance, int, const lcb_RESPSTORE *resp)
{
    InstanceCookie *cookie = InstanceCookie::get(instance);
    ThreadContext *tc = cookie->getContext();
    lcb_STATUS rc = lcb_respstore_status(resp);
    tc->setError(rc);
    updateStats(cookie, rc);

    const char *p;
    size_t n;
    lcb_respstore_key(resp, &p, &n);
    string key(p, n);
    uint32_t seqno = std::stol(key);
    if (rc != LCB_SUCCESS && tc->inPopulation()) {
        NextOp op;
        op.m_mode = NextOp::STORE;
        op.m_key = key;
        op.m_seqno = seqno;

        const lcb_KEY_VALUE_ERROR_CONTEXT *ctx;
        lcb_respstore_error_context(resp, &ctx);
        string scope;
        lcb_errctx_kv_scope(ctx, &p, &n);
        if (p && n) {
            op.m_scope.assign(p, n);
        }
        string collection;
        lcb_errctx_kv_collection(ctx, &p, &n);
        if (p && n) {
            op.m_collection.assign(p, n);
        }

        tc->retry(op);
    } else {
        tc->checkin(seqno);
    }

    updateOpsPerSecDisplay();
}

std::list<ThreadContext *> contexts;

extern "C" {
typedef void (*handler_t)(int);

static void dump_metrics()
{
    std::list<ThreadContext *>::iterator it;
    for (it = contexts.begin(); it != contexts.end(); ++it) {
        lcb_INSTANCE *instance = (*it)->getInstance();
        lcb_CMDDIAG *req;
        lcb_cmddiag_create(&req);
        lcb_cmddiag_prettify(req, true);
        lcb_diag(instance, nullptr, req);
        lcb_cmddiag_destroy(req);
        if (config.numTimings() > 0) {
            InstanceCookie::dumpTimings(instance);
        }
    }
}

#ifndef WIN32
static void diag_callback(lcb_INSTANCE *instance, int, const lcb_RESPDIAG *resp)
{
    lcb_STATUS rc = lcb_respdiag_status(resp);
    if (rc != LCB_SUCCESS) {
        fprintf(stderr, "%p, diag failed: %s\n", (void *)instance, lcb_strerror_short(rc));
    } else {
        const char *json;
        size_t njson;
        lcb_respdiag_value(resp, &json, &njson);
        if (njson) {
            fprintf(stderr, "\n%.*s", (int)njson, json);
        }

        {
            InstanceCookie *cookie = InstanceCookie::get(instance);
            lcb_METRICS *metrics;
            size_t ii;
            lcb_cntl(instance, LCB_CNTL_GET, LCB_CNTL_METRICS, &metrics);

            fprintf(stderr, "%p: total: %lu, etmpfail: %lu, eexist: %lu, etimeout: %lu, retried: %lu, rq: %lu\n",
                    (void *)instance, (unsigned long)cookie->stats.total, (unsigned long)cookie->stats.etmpfail,
                    (unsigned long)cookie->stats.eexist, (unsigned long)cookie->stats.etimeout,
                    (unsigned long)cookie->stats.retried, (unsigned long)metrics->packets_retried);
            for (ii = 0; ii < metrics->nservers; ii++) {
                fprintf(stderr, "  [srv-%d] snt: %lu, rcv: %lu, q: %lu, err: %lu, tmo: %lu, nmv: %lu, orph: %lu\n",
                        (int)ii, (unsigned long)metrics->servers[ii]->packets_sent,
                        (unsigned long)metrics->servers[ii]->packets_read,
                        (unsigned long)metrics->servers[ii]->packets_queued,
                        (unsigned long)metrics->servers[ii]->packets_errored,
                        (unsigned long)metrics->servers[ii]->packets_timeout,
                        (unsigned long)metrics->servers[ii]->packets_nmv,
                        (unsigned long)metrics->servers[ii]->packets_ownerless);
            }
        }
    }
}

static void sigquit_handler(int)
{
    dump_metrics();
    signal(SIGQUIT, sigquit_handler); // Reinstall
}

static void setup_sigquit_handler()
{
    struct sigaction action {
    };
    sigemptyset(&action.sa_mask);
    action.sa_handler = sigquit_handler;
    action.sa_flags = 0;
    sigaction(SIGQUIT, &action, nullptr);
}

static void sigint_handler(int)
{
    static int ncalled = 0;
    ncalled++;

    if (ncalled < 2) {
        log("\nTermination requested. Waiting threads to finish. Ctrl-C to force termination.");
        signal(SIGINT, sigint_handler); // Reinstall
        config.maxCycles = 0;
        return;
    }

    std::list<ThreadContext *>::iterator it;
    for (it = contexts.begin(); it != contexts.end(); ++it) {
        delete *it;
    }
    contexts.clear();
    exit(EXIT_FAILURE);
}

static void setup_sigint_handler()
{
    struct sigaction action {
    };
    sigemptyset(&action.sa_mask);
    action.sa_handler = sigint_handler;
    action.sa_flags = 0;
    sigaction(SIGINT, &action, nullptr);
}

static void *thread_worker(void *);

static void start_worker(ThreadContext *ctx)
{
    pthread_attr_t attr;
    pthread_attr_init(&attr);
    pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
    int rc = pthread_create(&ctx->thr, &attr, thread_worker, ctx);
    if (rc != 0) {
        log("Couldn't create thread: (%d)", errno);
        exit(EXIT_FAILURE);
    }
}
static void join_worker(ThreadContext *ctx)
{
    void *arg = nullptr;
    int rc = pthread_join(ctx->thr, &arg);
    if (rc != 0) {
        log("Couldn't join thread (%d)", errno);
        exit(EXIT_FAILURE);
    }
}

#else
static void setup_sigquit_handler() {}
static void setup_sigint_handler() {}
static void start_worker(ThreadContext *ctx)
{
    ctx->run();
}
static void join_worker(ThreadContext *ctx)
{
    (void)ctx;
}
#endif

static void *thread_worker(void *arg)
{
    auto *ctx = static_cast<ThreadContext *>(arg);
    ctx->run();
    return nullptr;
}
}

int main(int argc, char **argv)
{
    int exit_code = EXIT_SUCCESS;
    setup_sigint_handler();
    setup_sigquit_handler();

    Parser parser("cbc-pillowfight");
    try {
        config.addOptions(parser);
        parser.parse(argc, argv, false);
        config.processOptions();
    } catch (std::string &e) {
        std::cerr << e << std::endl;
        exit(EXIT_FAILURE);
    } catch (std::exception &e) {
        std::cerr << e.what() << std::endl;
        exit(EXIT_FAILURE);
    }
    size_t nthreads = config.getNumThreads();
    log("Running. Press Ctrl-C to terminate...");

#ifdef WIN32
    if (nthreads > 1) {
        log("WARNING: More than a single thread on Windows not supported. Forcing 1");
        nthreads = 1;
    }
#endif

    lcb_CREATEOPTS *options = nullptr;
    ConnParams &cp = config.params;
    lcb_STATUS error;

    for (uint32_t ii = 0; ii < nthreads; ++ii) {
        cp.fillCropts(options);
        lcb_INSTANCE *instance = nullptr;
        error = lcb_create(&instance, options);
        lcb_createopts_destroy(options);
        if (error != LCB_SUCCESS) {
            log("Failed to create instance: %s", lcb_strerror_short(error));
            exit(EXIT_FAILURE);
        }
        lcb_install_callback(instance, LCB_CALLBACK_STOREDUR, (lcb_RESPCALLBACK)storeCallback);
        lcb_install_callback(instance, LCB_CALLBACK_STORE, (lcb_RESPCALLBACK)storeCallback);
        lcb_install_callback(instance, LCB_CALLBACK_GET, (lcb_RESPCALLBACK)getCallback);
        lcb_install_callback(instance, LCB_CALLBACK_SDMUTATE, (lcb_RESPCALLBACK)subdocCallback);
        lcb_install_callback(instance, LCB_CALLBACK_SDLOOKUP, (lcb_RESPCALLBACK)subdocCallback);
        lcb_install_callback(instance, LCB_CALLBACK_NOOP, (lcb_RESPCALLBACK)noopCallback);
#ifndef WIN32
        lcb_install_callback(instance, LCB_CALLBACK_DIAG, (lcb_RESPCALLBACK)diag_callback);
        {
            int activate = 1;
            lcb_cntl(instance, LCB_CNTL_SET, LCB_CNTL_METRICS, &activate);
        }
#endif
        cp.doCtls(instance);
        if (config.useCollections()) {
            int use = 1;
            lcb_cntl(instance, LCB_CNTL_SET, LCB_CNTL_ENABLE_COLLECTIONS, &use);
        }

        auto *cookie = new InstanceCookie(instance);

        lcb_connect(instance);
        lcb_wait(instance, LCB_WAIT_DEFAULT);
        error = lcb_get_bootstrap_status(instance);

        if (error != LCB_SUCCESS) {
            std::cout << std::endl;
            log("Failed to connect: %s", lcb_strerror_long(error));
            exit(EXIT_FAILURE);
        }

        auto *ctx = new ThreadContext(instance, ii);
        cookie->setContext(ctx);
        contexts.push_back(ctx);
        start_worker(ctx);
    }

    for (auto &context : contexts) {
        join_worker(context);
    }
    if (config.numTimings() > 0) {
        dump_metrics();
    }
    return exit_code;
}