Add better error handling on Zulip (#1589)

* zulip: Treat unknown errors with a 10-second backoff.

An unknown error (including an unauthorized error) would fall through
with no calls to time.Sleep, resulting in hammering the server as
quickly as possible.

Add a 10-second sleep in the default error case.  The heartbeat is
left with no explicit sleep, but all other codepaths now contain one.

* version: Move version information into a separate package.

This will allow it to be accessed by other sections of the code.

* zulip: Use the matterbridge version in the user-agent.

Co-authored-by: Wim <wim@42.be>

7 files changed, 20 insertions, 13 deletions

diff --git a/.github/workflows/development.yml b/.github/workflows/development.yml
index ff7313cf..0f62c997 100644
--- a/.github/workflows/development.yml
+++ b/.github/workflows/development.yml
@@ -35,9 +35,9 @@ jobs:
       run: |
         mkdir -p output/{win,lin,arm,mac}
         VERSION=$(git describe --tags)
-        CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags "-s -X main.githash=$(git log --pretty=format:'%h' -n 1)" -o output/lin/matterbridge-$VERSION-linux-amd64
-        CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -ldflags "-s -X main.githash=$(git log --pretty=format:'%h' -n 1)" -o output/win/matterbridge-$VERSION-windows-amd64.exe
-        CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build -ldflags "-s -X main.githash=$(git log --pretty=format:'%h' -n 1)" -o output/mac/matterbridge-$VERSION-darwin-amd64
+        CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags "-s -X github.com/42wim/matterbridge/version.GitHash=$(git log --pretty=format:'%h' -n 1)" -o output/lin/matterbridge-$VERSION-linux-amd64
+        CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -ldflags "-s -X github.com/42wim/matterbridge/version.GitHash=$(git log --pretty=format:'%h' -n 1)" -o output/win/matterbridge-$VERSION-windows-amd64.exe
+        CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build -ldflags "-s -X github.com/42wim/matterbridge/version.GitHash=$(git log --pretty=format:'%h' -n 1)" -o output/mac/matterbridge-$VERSION-darwin-amd64
     - name: Upload linux 64-bit
       if: startsWith(matrix.go-version,'1.17')
       uses: actions/upload-artifact@v2
diff --git a/.goreleaser.yml b/.goreleaser.yml
index 5af21a85..c4f9064b 100644
--- a/.goreleaser.yml
+++ b/.goreleaser.yml
@@ -22,7 +22,7 @@ builds:
     - 6
     - 7
   ldflags:
-    - -s -w -X main.githash={{.ShortCommit}}
+    - -s -w -X github.com/42wim/matterbridge/version.GitHash={{.ShortCommit}}
 
 archives:
   -
diff --git a/Dockerfile b/Dockerfile
index 8e2dded6..6a2b8659 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,7 @@ FROM alpine:edge AS builder
 COPY . /go/src/matterbridge
 RUN apk --no-cache add go git \
         && cd /go/src/matterbridge \
-        && CGO_ENABLED=0 go build -mod vendor -ldflags "-X main.githash=$(git log --pretty=format:'%h' -n 1)" -o /bin/matterbridge
+        && CGO_ENABLED=0 go build -mod vendor -ldflags "-X github.com/42wim/matterbridge/version.GitHash=$(git log --pretty=format:'%h' -n 1)" -o /bin/matterbridge
 
 FROM alpine
 RUN apk --no-cache add ca-certificates mailcap
diff --git a/bridge/zulip/zulip.go b/bridge/zulip/zulip.go
index e66558a2..c912b6f0 100644
--- a/bridge/zulip/zulip.go
+++ b/bridge/zulip/zulip.go
@@ -2,6 +2,7 @@ package bzulip
 
 import (
 	"encoding/json"
+	"fmt"
 	"io/ioutil"
 	"strconv"
 	"strings"
@@ -11,6 +12,7 @@ import (
 	"github.com/42wim/matterbridge/bridge"
 	"github.com/42wim/matterbridge/bridge/config"
 	"github.com/42wim/matterbridge/bridge/helper"
+	"github.com/42wim/matterbridge/version"
 	gzb "github.com/matterbridge/gozulipbot"
 )
 
@@ -27,7 +29,7 @@ func New(cfg *bridge.Config) bridge.Bridger {
 }
 
 func (b *Bzulip) Connect() error {
-	bot := gzb.Bot{APIKey: b.GetString("token"), APIURL: b.GetString("server") + "/api/v1/", Email: b.GetString("login")}
+	bot := gzb.Bot{APIKey: b.GetString("token"), APIURL: b.GetString("server") + "/api/v1/", Email: b.GetString("login"), UserAgent: fmt.Sprintf("matterbridge/%s", version.Release)}
 	bot.Init()
 	q, err := bot.RegisterAll()
 	b.q = q
@@ -125,6 +127,7 @@ func (b *Bzulip) handleQueue() error {
 			b.Log.Debug("heartbeat received.")
 		default:
 			b.Log.Debugf("receiving error: %#v", err)
+			time.Sleep(time.Second * 10)
 		}
 		if err != nil {
 			continue
diff --git a/matterbridge.go b/matterbridge.go
index b9b7d6d3..7ab29784 100644
--- a/matterbridge.go
+++ b/matterbridge.go
@@ -10,15 +10,13 @@ import (
 	"github.com/42wim/matterbridge/bridge/config"
 	"github.com/42wim/matterbridge/gateway"
 	"github.com/42wim/matterbridge/gateway/bridgemap"
+	"github.com/42wim/matterbridge/version"
 	"github.com/google/gops/agent"
 	prefixed "github.com/matterbridge/logrus-prefixed-formatter"
 	"github.com/sirupsen/logrus"
 )
 
 var (
-	version = "1.23.1-dev"
-	githash string
-
 	flagConfig  = flag.String("conf", "matterbridge.toml", "config file")
 	flagDebug   = flag.Bool("debug", false, "enable debug")
 	flagVersion = flag.Bool("version", false, "show version")
@@ -28,7 +26,7 @@ var (
 func main() {
 	flag.Parse()
 	if *flagVersion {
-		fmt.Printf("version: %s %s\n", version, githash)
+		fmt.Printf("version: %s %s\n", version.Release, version.GitHash)
 		return
 	}
 
@@ -43,8 +41,8 @@ func main() {
 		}
 	}
 
-	logger.Printf("Running version %s %s", version, githash)
-	if strings.Contains(version, "-dev") {
+	logger.Printf("Running version %s %s", version.Release, version.GitHash)
+	if strings.Contains(version.Release, "-dev") {
 		logger.Println("WARNING: THIS IS A DEVELOPMENT VERSION. Things may break.")
 	}
 
diff --git a/tgs.Dockerfile b/tgs.Dockerfile
index 83a77e73..5badc0a7 100644
--- a/tgs.Dockerfile
+++ b/tgs.Dockerfile
@@ -5,7 +5,7 @@ RUN apk add \
     go \
     git \
   && cd /go/src/matterbridge \
-  && go build -mod vendor -ldflags "-X main.githash=$(git log --pretty=format:'%h' -n 1)" -o /bin/matterbridge
+  && go build -mod vendor -ldflags "-X github.com/42wim/matterbridge/version.GitHash=$(git log --pretty=format:'%h' -n 1)" -o /bin/matterbridge
 
 FROM alpine
 RUN apk --no-cache add \
diff --git a/version/version.go b/version/version.go
new file mode 100644
index 00000000..19f3fa3a
--- /dev/null
+++ b/version/version.go
@@ -0,0 +1,6 @@
+package version
+
+var (
+	Release = "1.23.1-dev"
+	GitHash string
+)