Handle expired/missed ticket counts from VSPs. (#180)

* Use go 1.21 & update build tools.

* Handle expired/missed ticket counts from VSPs.

.github/workflows/docker.yml

@@ -5,7 +5,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 #v3.5.3
+    - uses: actions/checkout@8ade135a41bc03ea155e62e844d188df1ea18608 #v4.1.0
     - name: Build the Docker image
       run: docker build -t decred/dcrwebapi:$(date +%s) .
 

.github/workflows/go.yml

@@ -9,16 +9,16 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go: ["1.19", "1.20"]
+        go: ["1.20", "1.21"]
     steps:
       - name: Set up Go
-        uses: actions/setup-go@fac708d6674e30b6ba41289acaab6d4b75aa0753 #v4.0.1
+        uses: actions/setup-go@93397bea11091df50f3d7e59dc26a7711a8bcfbe #v4.1.0
         with:
           go-version: ${{ matrix.go }}
       - name: Check out source
-        uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 #v3.5.3
+        uses: actions/checkout@8ade135a41bc03ea155e62e844d188df1ea18608 #v4.1.0
       - name: Install Linters
-        run: "curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin v1.53.3"
+        run: "curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin v1.54.2"
       - name: Build
         run: go build ./...
       - name: Test

Dockerfile

@@ -1,5 +1,5 @@
 # build
-FROM golang:1.20-alpine AS builder
+FROM golang:1.21-alpine AS builder
 
 WORKDIR $GOPATH/src/github.com/decred/dcrwebapi
 COPY . .

docs/api.md

@@ -26,7 +26,9 @@ Example: <https://api.decred.org/?c=vsp>
         "closed": false,
         "voting": 3935,
         "voted": 57073,
-        "revoked": 83
+        "revoked": 83,
+        "expired": 73,
+        "missed": 10,
     },
 }
 ```

service.go

@@ -30,6 +30,8 @@ type Vsp struct {
 	Voting                     int64   `json:"voting"`
 	Voted                      int64   `json:"voted"`
 	Revoked                    int64   `json:"revoked"`
+	Expired                    int64   `json:"expired"`
+	Missed                     int64   `json:"missed"`
 	VspdVersion                string  `json:"vspdversion"`
 	BlockHeight                uint64  `json:"blockheight"`
 	EstimatedNetworkProportion float64 `json:"estimatednetworkproportion"`
@@ -204,6 +206,8 @@ func vspStats(service *Service, url string) error {
 	voting, hasVoting := info["voting"]
 	voted, hasVoted := info["voted"]
 	revoked, hasRevoked := info["revoked"]
+	expired, hasExpired := info["expired"]
+	missed, hasMissed := info["missed"]
 	version, hasVersion := info["vspdversion"]
 	blockheight, hasBlockHeight := info["blockheight"]
 	networkproportion, hasnetworkproportion := info["estimatednetworkproportion"]
@@ -230,6 +234,18 @@ func vspStats(service *Service, url string) error {
 	vsp.BlockHeight = uint64(blockheight.(float64))
 	vsp.EstimatedNetworkProportion = networkproportion.(float64)
 
+	// Expired and Missed were introduced in vspd 1.3.0 so they will be absent
+	// from the responses received from older versions. When every VSP is
+	// updated to 1.3.0+ these fields can be treated like every other required
+	// field.
+	if hasExpired {
+		vsp.Expired = int64(expired.(float64))
+	}
+
+	if hasMissed {
+		vsp.Missed = int64(missed.(float64))
+	}
+
 	vsp.LastUpdated = time.Now().Unix()
 
 	service.Mutex.Lock()