summary: add bar graphs showing balances.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

summary/README.md

@@ -10,17 +10,49 @@ fiat amounts.
 
 ## Example Usage
 
+Unfortunately the python plugin framework doesn't pretty-print, nor does
+lightning-cli, and json_pp doesn't maintain order, so I use a hacky 'tr':
+
 ```
-$ lightning-cli summary | json_pp
+$ lightning-cli summary | tr ',' '\n'
-{
+{"network": "TESTNET"
-   "network" : "TESTNET",
+ "my_address": "031a3478d481b92e3c28810228252898c5f0d82fc4d07f5210c4f34d4aba56b769@165.227.30.200"
-   "utxo_amount" : "1.20119332000btc = USD $4582.22",
+ "num_utxos": 5
-   "avail_in" : "2.06940379btc = USD $7894.20",
+ "utxo_amount": "1.20119332000btc = USD $4589.24"
-   "avail_out" : "0.27095103btc = USD $1033.60",
+ "num_channels": 31
-   "my_address" : "031a3478d481b92e3c28810228252898c5f0d82fc4d07f5210c4f34d4aba56b769@165.227.30.200",
+ "num_connected": 1
-   "num_channels" : 31,
+ "num_gossipers": 32
-   "num_utxos" : 5,
+ "avail_out": "0.27095103btc = USD $1035.19"
-   "num_connected" : 1,
+ "avail_in": "2.06940379btc = USD $7906.30"
-   "num_gossipers" : 32
+ "channels": ["         ---------------------------/          :02ac05912f89e43b88de3472e8c3003b"
-}
+ "          -------------------------/-          :02dd4cef0192611bc34cd1c3a0a7eb0f"
+ "         /---------------------------          :02a13878947a133d7c96e70303a9bf27 (priv)"
+ "                      /-                       :033e2db012833d997e3c"
+ "                      /--                      :Kenny_Loggins"
+ "/--------------------------------------------- :DeutscheTestnetBank"
+ "/--------------------------------------------- :BlueLagoon1"
+ "/--------------------------------------------- :0270dd38e8af9a64b4a483ab12b6aeb1"
+ "                      /--                      :btctest.lnetwork.tokyo"
+ "                    /-----                     :microbet.fun"
+ "/--------------------------------------------- :02fcab6e34a2ad21be2a752ab96d13f5 (priv)"
+ "/--------------------------------------------- :htlc.me"
+ "                   /--------                   :02229ea9a7a4f9bf8bf25ce225079aed"
+ "/--------------------------------------------- :025d5b572a94235cfcbdc429181b2b88"
+ "          /-------------------------           :03c56de3a84336b4a939777ace9ecbef (priv)"
+ "              /------------------              :LiteStrikeBTClnd"
+ "      /----------------------------------      :037c9cf1cde4414c59407d547b7eac08 (priv)"
+ "                       /                       :03490a74e4def9125a84aee2d84e8cfe"
+ "  ---------------------/---------------------  :aranguren.org"
+ "                       /                       :03cc6603e1f6df535dd8b423284f2c09 (priv)"
+ "                      /-                       :cyclopes"
+ "/--------------------------------------------- :02b73a2160863e925e9fa978b0ddc56b (priv)"
+ "                   /--------                   :lnd-testnet.ignios.net"
+ "                    /-----                     :0327a104108173d4a4f34ab2cbc3084c (priv)"
+ "                     /----                     :dwarf"
+ "                      /-                       :028133777757ce281658804dd82f5758 (priv)"
+ "          /-------------------------           :02db62ffff5c35be74e7f856bba136db (priv)"
+ "                       /                       :Lightning Tea"
+ "                      /--                      :03015ac044f5fa9768ededf6fed9c0ff (priv)"
+ "                      /--                      :LND-Neutrino-TEST"
+ "/--------------------------------------------- :0270685ca81a8e4d4d01"]}
 ```

summary/summary.py

@@ -54,6 +54,7 @@ def summary(plugin):
 
     avail_out = Millisatoshi(0)
     avail_in = Millisatoshi(0)
+    chans = []
     reply['num_channels'] = 0
     reply['num_connected'] = 0
     reply['num_gossipers'] = info['num_peers']
@@ -65,12 +66,21 @@ def summary(plugin):
                 reply['num_connected'] += 1
                 reply['num_gossipers'] -= 1
             if c['our_reserve_msat'] < c['to_us_msat']:
-                avail_out += c['to_us_msat'] - c['our_reserve_msat']
+                to_us = c['to_us_msat'] - c['our_reserve_msat']
+            else:
+                to_us = Millisatoshi(0)
+            avail_out += to_us
+
             # We have to derive amount to them
-            to_them_msat = c['total_msat'] - c['to_us_msat']
+            to_them = c['total_msat'] - c['to_us_msat']
-            if c['their_reserve_msat'] < to_them_msat:
+            if c['their_reserve_msat'] < to_them:
-                avail_in += to_them_msat - c['their_reserve_msat']
+                to_them = to_them - c['their_reserve_msat']
+            else:
+                to_them = Millisatoshi(0)
+            avail_in += to_them
             reply['num_channels'] += 1
+            chans.append((c['total_msat'], to_us, to_them, p['id'], c['private']))
+
     reply['avail_out'] = avail_out.to_btc_str()
     reply['avail_in'] = avail_in.to_btc_str()
 
@@ -79,6 +89,24 @@ def summary(plugin):
         reply['avail_out'] += ' = ' + to_fiatstr(avail_out)
         reply['avail_in'] += ' = ' + to_fiatstr(avail_in)
 
+    if chans != []:
+        reply['channels'] = []
+        biggest = max(int(c[0]) for c in chans)
+        for c in chans:
+            # Create simple line graph
+            s = ('-' * int((int(c[1]) / biggest * 46))
+                 + '/' + '-' * int((int(c[2]) / biggest * 46)))
+            # Center it
+            s = "{:^47}".format(s)
+            node = plugin.rpc.listnodes(c[3])['nodes']
+            if len(node) != 0:
+                s += ':' + node[0]['alias']
+            else:
+                s += ':' + c[3][0:32]
+            if c[4]:
+                s += ' (priv)'
+            reply['channels'].append(s)
+
     return reply