Add new endpoint for dcrweb statistics.

Collects data from dcrdata and caches it, serves to JavaScript running
on the homepage of decred.org.

LICENSE

@@ -1,6 +1,6 @@
 ISC License
 
-Copyright (c) 2017-2023 The Decred developers
+Copyright (c) 2017-2024 The Decred developers
 
 Permission to use, copy, modify, and distribute this software for any
 purpose with or without fee is hereby granted, provided that the above

docs/api.md

@@ -32,3 +32,22 @@ Example: <https://api.decred.org/?c=vsp>
     },
 }
 ```
+
+## Get Web Info
+
+Collects data from dcrdata and caches it, serves to JavaScript running on the
+homepage of <https://decred.org>.
+
+Example: <https://api.decred.org/?c=webinfo>
+
+```json
+{
+    "circulatingsupply": 15802432.15830938,
+    "ultimatesupply": 20999999.9839432,
+    "stakedsupply": 9877100.80510565,
+    "blockreward": 6.44881,
+    "treasuryusd": 11627589.675361848,
+    "ticketprice": 253.5278664,
+    "daysuntilrewardchange": 16
+}
+```

go.mod

@@ -2,6 +2,60 @@ module github.com/decred/dcrwebapi
 
 go 1.18
 
-require github.com/gorilla/handlers v1.5.1
+require (
+	github.com/decred/dcrd/dcrutil/v4 v4.0.0
+	github.com/decred/dcrdata/exchanges/v3 v3.1.0
+	github.com/decred/dcrdata/v6 v6.0.0
+	github.com/gorilla/handlers v1.5.1
+)
 
-require github.com/felixge/httpsnoop v1.0.3 // indirect
+require (
+	decred.org/dcrdex v0.4.3 // indirect
+	decred.org/dcrwallet v1.7.0 // indirect
+	github.com/agl/ed25519 v0.0.0-20170116200512-5312a6153412 // indirect
+	github.com/carterjones/go-cloudflare-scraper v0.1.2 // indirect
+	github.com/carterjones/signalr v0.3.5 // indirect
+	github.com/dchest/siphash v1.2.2 // indirect
+	github.com/decred/base58 v1.0.3 // indirect
+	github.com/decred/dcrd/blockchain/stake/v3 v3.0.0 // indirect
+	github.com/decred/dcrd/blockchain/standalone/v2 v2.1.0 // indirect
+	github.com/decred/dcrd/certgen v1.1.1 // indirect
+	github.com/decred/dcrd/chaincfg/chainhash v1.0.3 // indirect
+	github.com/decred/dcrd/chaincfg/v3 v3.1.1 // indirect
+	github.com/decred/dcrd/crypto/blake256 v1.0.1-0.20200921185235-6d75c7ec1199 // indirect
+	github.com/decred/dcrd/crypto/ripemd160 v1.0.1 // indirect
+	github.com/decred/dcrd/database/v2 v2.0.2 // indirect
+	github.com/decred/dcrd/dcrec v1.0.1-0.20200921185235-6d75c7ec1199 // indirect
+	github.com/decred/dcrd/dcrec/edwards/v2 v2.0.2 // indirect
+	github.com/decred/dcrd/dcrec/secp256k1/v3 v3.0.0 // indirect
+	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1 // indirect
+	github.com/decred/dcrd/dcrjson/v3 v3.1.0 // indirect
+	github.com/decred/dcrd/dcrutil/v3 v3.0.0 // indirect
+	github.com/decred/dcrd/hdkeychain/v3 v3.1.0 // indirect
+	github.com/decred/dcrd/rpc/jsonrpc/types/v2 v2.3.0 // indirect
+	github.com/decred/dcrd/txscript/v3 v3.0.0 // indirect
+	github.com/decred/dcrd/txscript/v4 v4.0.0 // indirect
+	github.com/decred/dcrd/wire v1.5.0 // indirect
+	github.com/decred/go-socks v1.1.0 // indirect
+	github.com/decred/slog v1.2.0 // indirect
+	github.com/felixge/httpsnoop v1.0.3 // indirect
+	github.com/go-chi/chi/v5 v5.0.4 // indirect
+	github.com/golang/protobuf v1.4.3 // indirect
+	github.com/golang/snappy v0.0.4 // indirect
+	github.com/gorilla/websocket v1.4.2 // indirect
+	github.com/lib/pq v1.10.3 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/robertkrimen/otto v0.0.0-20180617131154-15f95af6e78d // indirect
+	github.com/syndtr/goleveldb v1.0.1-0.20210819022825-2ae1ddf74ef7 // indirect
+	go.etcd.io/bbolt v1.3.7-0.20220130032806-d5db64bdbfde // indirect
+	golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97 // indirect
+	golang.org/x/net v0.0.0-20210903162142-ad29c8ab022f // indirect
+	golang.org/x/sys v0.0.0-20210902050250-f475640dd07b // indirect
+	golang.org/x/text v0.3.6 // indirect
+	golang.org/x/time v0.0.0-20210220033141-f8bda1e9f3ba // indirect
+	google.golang.org/genproto v0.0.0-20201022181438-0ff5f38871d5 // indirect
+	google.golang.org/grpc v1.36.1 // indirect
+	google.golang.org/protobuf v1.25.0 // indirect
+	gopkg.in/ini.v1 v1.55.0 // indirect
+	gopkg.in/sourcemap.v1 v1.0.5 // indirect
+)