From 688f8c5f3f6410f85002962b46234b804a514b26 Mon Sep 17 00:00:00 2001
From: Vinnie Falco <vinnie.falco@gmail.com>
Date: Mon, 11 May 2015 18:50:24 -0700
Subject: [PATCH] Add historical ledger fetches per minute to get_counts

---
 src/ripple/app/ledger/InboundLedger.cpp  |  2 +-
 src/ripple/app/ledger/InboundLedgers.cpp | 25 ++++++++++++++++++++++++
 src/ripple/app/ledger/InboundLedgers.h   |  6 ++++++
 src/ripple/protocol/JsonFields.h         |  1 +
 src/ripple/rpc/handlers/GetCounts.cpp    |  3 +++
 5 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/src/ripple/app/ledger/InboundLedger.cpp b/src/ripple/app/ledger/InboundLedger.cpp
index 5dfc4d7768..a9c2b7fa37 100644
--- a/src/ripple/app/ledger/InboundLedger.cpp
+++ b/src/ripple/app/ledger/InboundLedger.cpp
@@ -353,9 +353,9 @@ void InboundLedger::done ()
     {
         mLedger->setClosed ();
         mLedger->setImmutable ();
-
         if (mReason != fcHISTORY)
             getApp().getLedgerMaster ().storeLedger (mLedger);
+        getApp().getInboundLedgers().onLedgerFetched(mReason);
     }
     else
         getApp().getInboundLedgers ().logFailure (mHash);
diff --git a/src/ripple/app/ledger/InboundLedgers.cpp b/src/ripple/app/ledger/InboundLedgers.cpp
index 1db464f4c5..ea80c100b6 100644
--- a/src/ripple/app/ledger/InboundLedgers.cpp
+++ b/src/ripple/app/ledger/InboundLedgers.cpp
@@ -21,6 +21,7 @@
 #include <ripple/app/ledger/InboundLedgers.h>
 #include <ripple/app/main/Application.h>
 #include <ripple/app/misc/NetworkOPs.h>
+#include <ripple/basics/DecayingSample.h>
 #include <ripple/basics/Log.h>
 #include <ripple/core/JobQueue.h>
 #include <beast/cxx14/memory.h> // <memory>
@@ -32,6 +33,11 @@ class InboundLedgersImp
     : public InboundLedgers
     , public beast::Stoppable
 {
+private:
+    std::mutex fetchRateMutex_;
+    // measures ledgers per second, constants are important
+    DecayWindow<30, clock_type> fetchRate_;
+
 public:
     typedef std::pair<uint256, InboundLedger::pointer> u256_acq_pair;
     // How long before we try again to acquire the same ledger
@@ -40,6 +46,7 @@ public:
     InboundLedgersImp (clock_type& clock, Stoppable& parent,
                        beast::insight::Collector::ptr const& collector)
         : Stoppable ("InboundLedgers", parent)
+        , fetchRate_(clock.now())
         , m_clock (clock)
         , mRecentFailures ("LedgerAcquireRecentFailures",
             clock, 0, kReacquireIntervalSeconds)
@@ -250,6 +257,24 @@ public:
         mLedgers.clear();
     }
 
+    std::size_t fetchRate()
+    {
+        std::lock_guard<
+            std::mutex> lock(fetchRateMutex_);
+        return 60 * fetchRate_.value(
+            m_clock.now());
+    }
+
+    void onLedgerFetched (
+        InboundLedger::fcReason why)
+    {
+        if (why != InboundLedger::fcHISTORY)
+            return;
+        std::lock_guard<
+            std::mutex> lock(fetchRateMutex_);
+        fetchRate_.add(1, m_clock.now());
+    }
+
     Json::Value getInfo()
     {
         Json::Value ret(Json::objectValue);
diff --git a/src/ripple/app/ledger/InboundLedgers.h b/src/ripple/app/ledger/InboundLedgers.h
index 726a31dde7..b7734611f9 100644
--- a/src/ripple/app/ledger/InboundLedgers.h
+++ b/src/ripple/app/ledger/InboundLedgers.h
@@ -71,6 +71,12 @@ public:
 
     virtual Json::Value getInfo() = 0;
 
+    /** Returns the rate of historical ledger fetches per minute. */
+    virtual std::size_t fetchRate() = 0;
+
+    /** Called when a complete ledger is obtained. */
+    virtual void onLedgerFetched (InboundLedger::fcReason why) = 0;
+
     virtual void gotFetchPack (Job&) = 0;
     virtual void sweep () = 0;
 
diff --git a/src/ripple/protocol/JsonFields.h b/src/ripple/protocol/JsonFields.h
index b237ab8b03..67468e7dc2 100644
--- a/src/ripple/protocol/JsonFields.h
+++ b/src/ripple/protocol/JsonFields.h
@@ -43,6 +43,7 @@ JSS ( Invalid );                    // out: app/misc/AccountState
 JSS ( LimitAmount );                // field.
 JSS ( OfferSequence );              // field.
 JSS ( Paths );                      // in/out: TransactionSign
+JSS ( historical_perminute );       // historical_perminute
 JSS ( SLE_hit_rate );               // out: GetCounts
 JSS ( SendMax );                    // in: TransactionSign
 JSS ( Sequence );                   // in/out: TransactionSign; field.
diff --git a/src/ripple/rpc/handlers/GetCounts.cpp b/src/ripple/rpc/handlers/GetCounts.cpp
index 5be73ecdc4..9484810853 100644
--- a/src/ripple/rpc/handlers/GetCounts.cpp
+++ b/src/ripple/rpc/handlers/GetCounts.cpp
@@ -20,6 +20,7 @@
 #include <BeastConfig.h>
 #include <ripple/app/data/DatabaseCon.h>
 #include <ripple/app/ledger/AcceptedLedger.h>
+#include <ripple/app/ledger/InboundLedgers.h>
 #include <ripple/basics/UptimeTimer.h>
 #include <ripple/nodestore/Database.h>
 
@@ -69,6 +70,8 @@ Json::Value doGetCounts (RPC::Context& context)
 
     ret[jss::write_load] = app.getNodeStore ().getWriteLoad ();
 
+    ret[jss::historical_perminute] = static_cast<int>(
+        app.getInboundLedgers().fetchRate());
     ret[jss::SLE_hit_rate] = app.getSLECache ().getHitRate ();
     ret[jss::node_hit_rate] = app.getNodeStore ().getCacheHitRate ();
     ret[jss::ledger_hit_rate] = app.getLedgerMaster ().getCacheHitRate ();