From ed7f4ef6680a86641786510592f223cf5d333493 Mon Sep 17 00:00:00 2001
From: didier amyot <didier.amyot@behavox.com>
Date: Thu, 10 Sep 2020 12:47:41 -0400
Subject: [PATCH] started to refactor code.

---
 src/clj/skirmish/ledger/core.clj       |  96 ++-----------
 src/clj/skirmish/ledger/data_layer.clj |  88 ++++++++++++
 src/clj/skirmish/ledger/routes.clj     | 183 +++++++++++++++++++++++++
 test/clj/skirmish/ledger/core_test.clj |   6 -
 test/clj/skirmish/ledger/test_core.clj |  38 ++---
 5 files changed, 300 insertions(+), 111 deletions(-)
 create mode 100644 src/clj/skirmish/ledger/data_layer.clj
 create mode 100644 src/clj/skirmish/ledger/routes.clj
 delete mode 100644 test/clj/skirmish/ledger/core_test.clj

diff --git a/src/clj/skirmish/ledger/core.clj b/src/clj/skirmish/ledger/core.clj
index e7b20a3..967aa1a 100644
--- a/src/clj/skirmish/ledger/core.clj
+++ b/src/clj/skirmish/ledger/core.clj
@@ -7,6 +7,7 @@
             [compojure.route :refer [not-found]]
             [skirmish.exchange-gateway.exchange-gateway :refer [create-routes-for-exchange]]
             [skirmish.rest.util :refer [build-response get-body cors-middleware]]
+            [skirmish.ledger.data-layer :as data-layer]
             [skirmish.ledger.accounts]
             [datomic.api :as d]
             [taoensso.timbre :as timbre]
@@ -17,86 +18,6 @@
 
 ;; the ledger is the central
 
-
-
-(defn compute-simple-face-value [amount daily-interest-rate deposit-date value-date]
-  (let [min-in-milliseconds (infix 60 * 1000)
-        minute-interest-rate (infix daily-interest-rate / (24 * 60. * 10000.))
-        ite (quot (- (. value-date getTime) (. deposit-date getTime)) min-in-milliseconds)
-        base (infix 1 + minute-interest-rate)]
-    (infix amount * base ** ite)))
-
-(defn- in-interval? [[_ start end] x]
-  (let [x-time (. x getTime)]
-    (and (<= (. start getTime) x-time)
-         (< x-time (. end getTime)))))
-
-(defn- larger-then-interval? [[ _ start end] x]
-  (and (<= (. x getTime) (. end getTime))
-       (<= (. x getTime) (. start getTime))))
-
-
-(defn- split-interest-rate-intervals [interest-rates-intervals deposit-date value-date]
-  (let [xf (comp (drop-while #((comp not in-interval?) % deposit-date))
-                 (take-while #((comp not larger-then-interval?) % value-date)))
-        ret (into [] xf interest-rates-intervals)
-        ret (assoc-in ret [0 1] deposit-date)
-        ret (assoc-in ret [(-> ret count dec) 2] value-date)]
-    ret))
-
-(defn- find-interest-rate-for [interest-rates-intervals d]
-  (if (in-interval? (first interest-rates-intervals) d)
-    (ffirst interest-rates-intervals)
-    (recur (rest interest-rates-intervals) d)))
-
-
-(defn split-interest-rates [interest-rates deposit-date value-date]
-  (let [interest-rates (into  [[0 (new java.util.Date 0)]] interest-rates)
-        interest-rates (conj interest-rates [0 (new java.util.Date Long/MAX_VALUE)])
-        interest-rates-intervals (partition 2 1 interest-rates)
-        interest-rates-intervals (map (juxt ffirst (comp second first) (comp second second)) interest-rates-intervals)]
-    (if (= deposit-date value-date)
-      [[(find-interest-rate-for interest-rates-intervals deposit-date) deposit-date value-date]]
-      (split-interest-rate-intervals interest-rates-intervals deposit-date value-date))))
-
-(defn compute-face-value [amount interest-rates deposit-date value-date]
-  (loop [interest-rates (split-interest-rates interest-rates deposit-date value-date)
-         amount amount]
-    (let [[interest-rate start end] (first interest-rates)
-          amount (compute-simple-face-value amount interest-rate start end)]
-      (if (empty? (rest interest-rates))
-        (long amount)
-        (recur (rest interest-rates) amount)))))
-
-(defn get-interest-rate-history [db sec-id]
-  (let [history (d/history db)
-        interest-rates (d/q '[:find ?interest-rate ?v
-                              :in $ ?eid
-                              :where [?e :skirmish.security/interest-rate ?interest-rate ?tx]
-                                     [?e :skirmish.security/sec-id ?sec-id]
-                              [?tx :db/txInstant ?v]]
-                            history sec-id)]
-    (sort-by second interest-rates)))
-
-(defn compute-face-value-from-db [db amount sec-id date]
-  (compute-face-value amount
-                      (get-interest-rate-history db sec-id)
-                      date
-                      (new java.util.Date)))
-
-(defn get-amount-in-account [db account-id]
-  (let [[amount sec-id pk date] (d/q '[:find [?amount ?sec-id ?pk ?v]
-                                       :in $ ?account-id
-                                       :where [?e :skirmish.ledger/owner-public-key ?account-id]
-                                              [?e :skirmish.ledger/amount ?amount ?tx]
-                                              [?e :skirmish.ledger/sec ?sec]
-                                              [?sec :skirmish.security/sec-id ?sec-id]
-                                              [?e :skirmish.ledger/owner-public-key ?pk]
-                                              [?tx :db/txInstant ?v]] db account-id)]
-    {:amount  (when (some? sec-id) (compute-face-value-from-db db amount sec-id date))
-     :sec-id sec-id
-     :account-public-key pk}))
-
 ;;  an :account-id is the public key of a
 ;;  an :account-secret is an :account-id private key
 
@@ -114,7 +35,7 @@
   "Returns the value of an account."
   (fn [{{account-id :account-id} :route-params :as request}]
     (let [db (d/db conn)
-          account-info (get-amount-in-account db account-id)]
+          account-info (data-layer/get-amount-in-account db account-id)]
       (get-account-body request account-info))))
 
 (s/def ::transaction (s/cat :type #{:transfer-immediately}
@@ -152,7 +73,7 @@
          name :skirmish.security/name
          number-of-decimal :skirmish.security/number-of-decimal
          type_ :skirmish.security/type} e
-         interest-rate-history (get-interest-rate-history db id)
+         interest-rate-history (data-layer/get-interest-rate-history db id)
          volumes (d/q '[:find ?amount ?date
                         :in $ ?id
                         :where [?e :skirmish.ledger/sec ?id]
@@ -160,7 +81,7 @@
                                [?tx :db/txInstant ?date]]
                       db id)
         now (new java.util.Date)
-        volume (reduce + 0 (map #(compute-face-value (first %) interest-rate-history (second %) now) volumes))]
+        volume (reduce + 0 (map #(data-layer/compute-face-value (first %) interest-rate-history (second %) now) volumes))]
     {:sec-id sec-id
      :interest-rate interest-rate
      :volume (or volume 0)
@@ -184,7 +105,7 @@
   (fn [{body :body :as request}]
     (try+
       (let [[sec-id interest-rate] (-> body get-body get-new-security)
-             new-sec @(d/transact conn [[:skirmish.ledger/create-security sec-id interest-rate]])]
+             new-sec @(data-layer/create-security conn sec-id interest-rate)]
         (build-response request {:body {:success true}
                                  :headers {"location" (str "/api/1" "/ledger/securities/" (name sec-id))}}))
       (catch [:error-type :4XX] e (build-response request e))
@@ -219,7 +140,8 @@
 
 (defn get-available-securities [conn]
   (fn [request]
-    (let [securities (d/q '[:find ?s :where [?e :skirmish.security/sec-id ?s]] (d/db conn))]
+    (let [db (d/db conn)
+          securities (data-layer/get-all-securities-id db)]
       (build-response request (get-available-securities-body securities)))))
 
 
@@ -259,8 +181,8 @@
 
 (defn get-available-accounts [conn]
   (fn [request]
-    (let [securities (d/q '[:find ?pk :where [?e :skirmish.ledger/owner-public-key ?pk]] (d/db conn))]
-      (build-response request (get-available-accounts-body securities)))))
+    (let [db (d/db conn)]
+      (build-response request (get-available-accounts-body (data-layer/get-all-account-public-key db))))))
 
 
 (defn get-api-description [request]
diff --git a/src/clj/skirmish/ledger/data_layer.clj b/src/clj/skirmish/ledger/data_layer.clj
new file mode 100644
index 0000000..7bd542f
--- /dev/null
+++ b/src/clj/skirmish/ledger/data_layer.clj
@@ -0,0 +1,88 @@
+(ns skirmish.ledger.data-layer
+  (:require [datomic.api :as d]
+            [infix.macros :refer [infix]]))
+
+(defn get-all-account-public-key [db]
+  (d/q '[:find ?pk :where [?e :skirmish.ledger/owner-public-key ?pk]] db))
+
+(defn compute-simple-face-value [amount daily-interest-rate deposit-date value-date]
+  (let [min-in-milliseconds (infix 60 * 1000)
+        minute-interest-rate (infix daily-interest-rate / (24 * 60. * 10000.))
+        ite (quot (- (. value-date getTime) (. deposit-date getTime)) min-in-milliseconds)
+        base (infix 1 + minute-interest-rate)]
+    (infix amount * base ** ite)))
+
+(defn- in-interval? [[_ start end] x]
+  (let [x-time (. x getTime)]
+    (and (<= (. start getTime) x-time)
+         (< x-time (. end getTime)))))
+
+(defn- larger-then-interval? [[ _ start end] x]
+  (and (<= (. x getTime) (. end getTime))
+       (<= (. x getTime) (. start getTime))))
+
+(defn- split-interest-rate-intervals [interest-rates-intervals deposit-date value-date]
+  (let [xf (comp (drop-while #((comp not in-interval?) % deposit-date))
+                 (take-while #((comp not larger-then-interval?) % value-date)))
+        ret (into [] xf interest-rates-intervals)
+        ret (assoc-in ret [0 1] deposit-date)
+        ret (assoc-in ret [(-> ret count dec) 2] value-date)]
+    ret))
+
+(defn- find-interest-rate-for [interest-rates-intervals d]
+  (if (in-interval? (first interest-rates-intervals) d)
+    (ffirst interest-rates-intervals)
+    (recur (rest interest-rates-intervals) d)))
+
+(defn split-interest-rates [interest-rates deposit-date value-date]
+  (let [interest-rates (into  [[0 (new java.util.Date 0)]] interest-rates)
+        interest-rates (conj interest-rates [0 (new java.util.Date Long/MAX_VALUE)])
+        interest-rates-intervals (partition 2 1 interest-rates)
+        interest-rates-intervals (map (juxt ffirst (comp second first) (comp second second)) interest-rates-intervals)]
+    (if (= deposit-date value-date)
+      [[(find-interest-rate-for interest-rates-intervals deposit-date) deposit-date value-date]]
+      (split-interest-rate-intervals interest-rates-intervals deposit-date value-date))))
+
+(defn compute-face-value [amount interest-rates deposit-date value-date]
+  (loop [interest-rates (split-interest-rates interest-rates deposit-date value-date)
+         amount amount]
+    (let [[interest-rate start end] (first interest-rates)
+          amount (compute-simple-face-value amount interest-rate start end)]
+      (if (empty? (rest interest-rates))
+        (long amount)
+        (recur (rest interest-rates) amount)))))
+
+(defn get-interest-rate-history [db sec-id]
+  (let [history (d/history db)
+        interest-rates (d/q '[:find ?interest-rate ?v
+                              :in $ ?eid
+                              :where [?e :skirmish.security/interest-rate ?interest-rate ?tx]
+                              [?e :skirmish.security/sec-id ?sec-id]
+                              [?tx :db/txInstant ?v]]
+                            history sec-id)]
+    (sort-by second interest-rates)))
+
+(defn compute-face-value-from-db [db amount sec-id date]
+  (compute-face-value amount
+                      (get-interest-rate-history db sec-id)
+                      date
+                      (new java.util.Date)))
+
+(defn get-amount-in-account [db account-id]
+  (let [[amount sec-id pk date] (d/q '[:find [?amount ?sec-id ?pk ?v]
+                                       :in $ ?account-id
+                                       :where [?e :skirmish.ledger/owner-public-key ?account-id]
+                                       [?e :skirmish.ledger/amount ?amount ?tx]
+                                       [?e :skirmish.ledger/sec ?sec]
+                                       [?sec :skirmish.security/sec-id ?sec-id]
+                                       [?e :skirmish.ledger/owner-public-key ?pk]
+                                       [?tx :db/txInstant ?v]] db account-id)]
+    {:amount  (when (some? sec-id) (compute-face-value-from-db db amount sec-id date))
+     :sec-id sec-id
+     :account-public-key pk}))
+
+(defn get-all-securities-id [db]
+  (d/q '[:find ?s :where [?e :skirmish.security/sec-id ?s]] db))
+
+(defn create-security [conn sec-id interest-rate]
+  (d/transact conn [[:skirmish.ledger/create-security sec-id interest-rate]]))
\ No newline at end of file
diff --git a/src/clj/skirmish/ledger/routes.clj b/src/clj/skirmish/ledger/routes.clj
new file mode 100644
index 0000000..e6ecd2b
--- /dev/null
+++ b/src/clj/skirmish/ledger/routes.clj
@@ -0,0 +1,183 @@
+(ns skirmish.ledger.routes
+  (:require [skirmish.rest.util :refer [build-response get-body cors-middleware]]
+            [skirmish.ledger.data-layer :as data-layer]
+            [skirmish.routes.core :as routes]
+            [compojure.core :as compojure]
+            [compojure.route :refer [not-found]]
+            [clojure.spec.alpha :as s]
+            [datomic.api :as d]
+            [slingshot.slingshot :refer [try+ throw+]]))
+
+
+
+(defn get-api-description [request]
+  (let [body  [{:url "ledger/accounts" :name "accounts"}
+               {:url "ledger/securities" :name "securities"}]]
+    (build-response request body)))
+
+(defn get-available-accounts-body [accounts]
+  (let [sec-id->url #(routes/get-path-for :ledger/account {:account-id (name %)})
+        to-security-description #(hash-map :account-public-key % :url (sec-id->url %))
+        xf (comp cat (map to-security-description))
+        securities-info  (sequence xf accounts)]
+    {:accounts securities-info}))
+
+
+(defn get-available-accounts [conn]
+  (fn [request]
+    (let [db (d/db conn)
+          resp (get-available-accounts-body (data-layer/get-all-account-public-key db))]
+      (build-response request resp))))
+
+(defn get-account-body [request {sec-id :sec-id amount :amount account-public-key :account-public-key}]
+  (if (nil? sec-id)
+    (build-response request {:status 404})
+    (let [sec-url (str "/api/1/ledger/securities/" (name sec-id))
+          beautify-account { :amount amount
+                            :sec-id sec-id
+                            :account-public-key account-public-key}
+          ret {:account beautify-account  :sec-url sec-url}]
+      (build-response request ret))))
+
+(defn get-account [conn]
+  "Returns the value of an account."
+  (fn [{{account-id :account-id} :route-params :as request}]
+    (let [db (d/db conn)
+          account-info (data-layer/get-amount-in-account db account-id)]
+      (get-account-body request account-info))))
+
+(defn get-account [conn]
+  "Returns the value of an account."
+  (fn [{{account-id :account-id} :route-params :as request}]
+    (let [db (d/db conn)
+          account-info (data-layer/get-amount-in-account db account-id)]
+      (get-account-body request account-info))))
+
+(defn get-transactions [conn]
+  (fn [request]
+    (let [all-pending-transactions []]
+      (build-response request all-pending-transactions))))
+
+(defn create-transactions [conn]
+  (fn [{body :body :as request}]
+    (try+
+      (build-response request {:message "merci beaucoup"})
+      (catch [:error-type :4XX] e (build-response request e))
+      (catch [:error-type :5XX] e (build-response request e)))))
+
+(defn get-available-securities-body [securities]
+  (let [sec-id->url #(routes/get-path-for :ledger/security {:sec-id (name %)})
+        to-security-description #(hash-map :sec-id % :url (sec-id->url %))
+        xf (comp cat (map to-security-description))
+        securities-info  (sequence xf securities)];;
+    {:securities securities-info}))
+
+
+(defn get-available-securities [conn]
+  (fn [request]
+    (let [db (d/db conn)
+          securities (data-layer/get-all-securities-id db)]
+      (build-response request (get-available-securities-body securities)))))
+
+(defn get-new-security [raw-securities]
+  (if (s/valid? :skirmish.ledger.core/security raw-securities)
+    raw-securities
+    (throw+ {:error-type :4XX :status 400 :body {:error "Invalid security format."}})))
+
+(defn create-security [conn]
+  "Create a fresh new security."
+  (fn [{body :body :as request}]
+    (try+
+      (let [[sec-id interest-rate] (-> body get-body get-new-security)
+            new-sec @(data-layer/create-security conn sec-id interest-rate)]
+        (build-response request {:body {:success true}
+                                 :headers {"location" (str "/api/1" "/ledger/securities/" (name sec-id))}}))
+      (catch [:error-type :4XX] e (build-response request e))
+      (catch [:error-type :5XX] e (build-response request e)))))
+
+
+(defn prettify-security [e db]
+  (let [{interest-rate :skirmish.security/interest-rate
+         description :skirmish.security/description
+         id :db/id
+         sec-id :skirmish.security/sec-id
+         symbol :skirmish.security/symbol
+         name :skirmish.security/name
+         number-of-decimal :skirmish.security/number-of-decimal
+         type_ :skirmish.security/type} e
+         interest-rate-history (data-layer/get-interest-rate-history db id)
+         volumes (d/q '[:find ?amount ?date
+                        :in $ ?id
+                        :where [?e :skirmish.ledger/sec ?id]
+                               [?e :skirmish.ledger/amount ?amount ?tx]
+                               [?tx :db/txInstant ?date]]
+                       db id)
+         now (new java.util.Date)
+         volume (reduce + 0 (map #(data-layer/compute-face-value (first %) interest-rate-history (second %) now) volumes))]
+    {:sec-id sec-id
+     :interest-rate interest-rate
+     :volume (or volume 0)
+     :name name
+     :interest-rate-history interest-rate-history
+     :symbol symbol
+     :number-of-decimal number-of-decimal
+     :type type_
+     :description description}))
+
+(defn get-security-from-db [conn sec-id]
+  (let [db (d/db conn)
+        e (d/pull db '[*] [:skirmish.security/sec-id sec-id])]
+    (if (-> e :db/id nil?)
+      (throw+ {:error-type :4XX :status 404 :body {:error "Security not found."}})
+      (prettify-security e db))))
+
+(defn get-security [conn]
+  "Returns the security."
+  (fn [{{sec-id-str :sec-id} :route-params  :as request}]
+    (try+
+      (let [sec-id (keyword sec-id-str)]
+        (build-response request (get-security-from-db conn sec-id)))
+      (catch [:error-type :4XX] e (build-response request e))
+      (catch [:error-type :5XX] e (build-response request e)))))
+
+(defn update-security [conn]
+  "Update a security with new features."
+  (fn [request]
+    (try+
+      (catch [:error-type :4XX] e (build-response request e))
+      (catch [:error-type :5XX] e (build-response request e)))))
+
+(defn get-emit-securities-request [[amount account] sec-id]
+  (if (s/valid? :skirmish.ledger.core/emit-securities [sec-id amount account])
+    [:skirmish.ledger/emit-securities sec-id amount account]
+    (throw+ {:error-type :4XX :status 400 :body {:error "Invalid emit request."}})))
+
+
+(defn emit-securities [conn]
+  "Emit securities in the specified wallet.  This is the only way to
+  create securities.
+
+  payload
+    [:amount :account]"
+  (fn [{{sec-id-str :sec-id} :route-params body :body :as request}]
+    (try+
+      (let [emit-request (-> body get-body (get-emit-securities-request (keyword sec-id-str)))]
+        @(d/transact conn [emit-request])
+        (build-response request {}))
+      (catch [:error-type :4XX] e (build-response request e))
+      (catch [:error-type :5XX] e (build-response request e)))))
+
+(defn create-routes-for-ledger [conn]
+  (compojure/routes
+    (routes/context :ledger []
+                    (routes/GET :ledger/home [] get-api-description)
+                    (routes/GET :ledger/accounts [] (get-available-accounts conn))
+                    (routes/GET :ledger/account [] (get-account conn))
+                    (routes/GET :ledger/transactions [] (get-transactions conn))
+                    (routes/POST :ledger/transactions [] (create-transactions conn))
+                    (routes/GET :ledger/securities [] (get-available-securities conn))
+                    (routes/POST :ledger/securities [] (create-security conn))
+                    (routes/GET :ledger/security [] (get-security conn))
+                    (routes/PUT :ledger/security [] (update-security conn)))   ;; not done
+                    ;(routes/POST :ledger/security [] (emit-securities conn))) ;; done
+    (not-found "not found")))
\ No newline at end of file
diff --git a/test/clj/skirmish/ledger/core_test.clj b/test/clj/skirmish/ledger/core_test.clj
deleted file mode 100644
index eb27f93..0000000
--- a/test/clj/skirmish/ledger/core_test.clj
+++ /dev/null
@@ -1,6 +0,0 @@
-(ns skirmish.ledger.core-test
-  (:require [clojure.test :refer :all])
-  (:require [skirmish.ledger.core :refer [get-amount-in-account]]))
-
-(deftest get-amount-in-account-test)
-
diff --git a/test/clj/skirmish/ledger/test_core.clj b/test/clj/skirmish/ledger/test_core.clj
index c2c69b0..255c7d9 100644
--- a/test/clj/skirmish/ledger/test_core.clj
+++ b/test/clj/skirmish/ledger/test_core.clj
@@ -1,13 +1,15 @@
 (ns skirmish.ledger.test-core
   (:require [midje.sweet :refer :all]
-            [datomic.api :as d]
-            [clojure.edn]
+            [skirmish.ledger.data-layer :as data-layer]
+            [skirmish.ledger.accounts :refer [create-connection schema]]
             [skirmish.rest.util :refer [build-response]]
             [skirmish.ledger.core :refer :all]
             [skirmish.rest.util :refer [edn->stream]]
+            [datomic.api :as d]
+            [clojure.edn]
             [clojure.spec.alpha :as s]
-            [infix.macros :refer [infix]]
-            [skirmish.ledger.accounts :refer [create-connection schema]]))
+            [infix.macros :refer [infix]]))
+
 
 (defn spec-check [spec]
   #(s/valid? spec %))
@@ -208,11 +210,11 @@
                    start #inst"2020-09-05T00:00:00.000-00:00"
                    start+1d #inst"2020-09-06T00:00:00.000-00:00"
                    start+2d #inst"2020-09-07T00:00:00.000-00:00"]
-               (compute-simple-face-value amount interest-rate start start) => (roughly amount)
-               (compute-simple-face-value amount interest-rate start start+1d) => (roughly 1105.1670808)
-               (compute-simple-face-value amount interest-rate start start+2d) => (roughly 1221.3942766)
-               (compute-simple-face-value amount negative-interest-rate start start+2d) => (roughly 818.7250672)
-               (compute-simple-face-value amount 0 start start+2d) => (roughly amount)))
+               (data-layer/compute-simple-face-value amount interest-rate start start) => (roughly amount)
+               (data-layer/compute-simple-face-value amount interest-rate start start+1d) => (roughly 1105.1670808)
+               (data-layer/compute-simple-face-value amount interest-rate start start+2d) => (roughly 1221.3942766)
+               (data-layer/compute-simple-face-value amount negative-interest-rate start start+2d) => (roughly 818.7250672)
+               (data-layer/compute-simple-face-value amount 0 start start+2d) => (roughly amount)))
        (fact "split-interest-rates"
              (let [d-1d #inst"2020-09-04T00:00:00.000-00:00"
                    d-½d #inst"2020-09-04T12:00:00.000-00:00"
@@ -225,11 +227,11 @@
                    d+3d #inst"2020-09-08T00:00:00.000-00:00"
                    d+3½d #inst"2020-09-08T12:00:00.000-00:00";;
                    interest-rates [[10 d] [15 d+1d] [20 d+2d]]]
-               (split-interest-rates interest-rates d+½d d+3d) => [[10 d+½d d+1d] [15 d+1d d+2d] [20 d+2d d+3d]]
-               (split-interest-rates interest-rates d+3d d+3½d) => [[20 d+3d d+3½d]]
-               (split-interest-rates interest-rates d-1d d-½d) => [[0 d-1d d-½d]]
-               (split-interest-rates interest-rates d d+½d) => [[10 d d+½d]]
-               (split-interest-rates interest-rates d+2½d d+2½d) => [[20 d+2½d d+2½d]]))
+               (data-layer/split-interest-rates interest-rates d+½d d+3d) => [[10 d+½d d+1d] [15 d+1d d+2d] [20 d+2d d+3d]]
+               (data-layer/split-interest-rates interest-rates d+3d d+3½d) => [[20 d+3d d+3½d]]
+               (data-layer/split-interest-rates interest-rates d-1d d-½d) => [[0 d-1d d-½d]]
+               (data-layer/split-interest-rates interest-rates d d+½d) => [[10 d d+½d]]
+               (data-layer/split-interest-rates interest-rates d+2½d d+2½d) => [[20 d+2½d d+2½d]]))
        (fact "compute-face-value"
          (let [d-1d #inst"2020-09-04T00:00:00.000-00:00"
                d-½d #inst"2020-09-04T12:00:00.000-00:00"
@@ -243,15 +245,15 @@
                d+3½d #inst"2020-09-08T12:00:00.000-00:00"
                amount 10000000
                interest-rates [[10 d] [15 d+1d] [20 d+2d]]]
-           (compute-face-value amount interest-rates d+½d d+½d) => amount
-           (compute-face-value amount interest-rates d-1d d-½d) => amount
-           (compute-face-value amount interest-rates d-1d d+3d) => 10045101))
+           (data-layer/compute-face-value amount interest-rates d+½d d+½d) => amount
+           (data-layer/compute-face-value amount interest-rates d-1d d-½d) => amount
+           (data-layer/compute-face-value amount interest-rates d-1d d+3d) => 10045101))
        (fact "we had bugs... we need to fix them"
           (let [deposit-date #inst"2020-09-09T18:49:47.205-00:00"
                 value-date   #inst"2020-09-09T18:52:56.760-00:00"
                 amount 105402100
                 interest-rates (list [1000 #inst "2020-09-09T18:47:34.152-00:00"])]
-            (compute-face-value amount interest-rates deposit-date value-date) => 105424060)))
+            (data-layer/compute-face-value amount interest-rates deposit-date value-date) => 105424060)))
 
 
 ;;    4. transfer sec from one account to the other.