add fail-test file instead of dep, closes #2638 (#2728)

original author of this file is @ebuchman:

https://github.com/ebuchman/fail-test

Gopkg.lock

@@ -35,13 +35,6 @@
   revision = "8991bc29aa16c548c550c7ff78260e27b9ab7c73"
   version = "v1.1.1"
 
-[[projects]]
-  digest = "1:c7644c73a3d23741fdba8a99b1464e021a224b7e205be497271a8003a15ca41b"
-  name = "github.com/ebuchman/fail-test"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "95f809107225be108efcf10a3509e4ea6ceef3c4"
-
 [[projects]]
   digest = "1:544229a3ca0fb2dd5ebc2896d3d2ff7ce096d9751635301e44e37e761349ee70"
   name = "github.com/fortytw2/leaktest"
@@ -503,7 +496,6 @@
   input-imports = [
     "github.com/btcsuite/btcutil/base58",
     "github.com/btcsuite/btcutil/bech32",
-    "github.com/ebuchman/fail-test",
     "github.com/fortytw2/leaktest",
     "github.com/go-kit/kit/log",
     "github.com/go-kit/kit/log/level",

Gopkg.toml

@@ -81,10 +81,6 @@
   name = "github.com/jmhodges/levigo"
   revision = "c42d9e0ca023e2198120196f842701bb4c55d7b9"
 
-[[constraint]]
-  name = "github.com/ebuchman/fail-test"
-  revision = "95f809107225be108efcf10a3509e4ea6ceef3c4"
-
 # last revision used by go-crypto
 [[constraint]]
   name = "github.com/btcsuite/btcutil"

consensus/state.go

@@ -9,8 +9,8 @@ import (
 	"sync"
 	"time"
 
-	fail "github.com/ebuchman/fail-test"
 	cmn "github.com/tendermint/tendermint/libs/common"
+	"github.com/tendermint/tendermint/libs/fail"
 	"github.com/tendermint/tendermint/libs/log"
 	tmtime "github.com/tendermint/tendermint/types/time"
 

libs/fail/fail.go

@@ -0,0 +1,78 @@
+package fail
+
+import (
+	"fmt"
+	"math/rand"
+	"os"
+	"strconv"
+)
+
+var callIndexToFail int
+
+func init() {
+	callIndexToFailS := os.Getenv("FAIL_TEST_INDEX")
+
+	if callIndexToFailS == "" {
+		callIndexToFail = -1
+	} else {
+		var err error
+		callIndexToFail, err = strconv.Atoi(callIndexToFailS)
+		if err != nil {
+			callIndexToFail = -1
+		}
+	}
+}
+
+// Fail when FAIL_TEST_INDEX == callIndex
+var (
+	callIndex int //indexes Fail calls
+
+	callRandIndex       int  // indexes a run of FailRand calls
+	callRandIndexToFail = -1 // the callRandIndex to fail on in FailRand
+)
+
+func Fail() {
+	if callIndexToFail < 0 {
+		return
+	}
+
+	if callIndex == callIndexToFail {
+		Exit()
+	}
+
+	callIndex += 1
+}
+
+// FailRand should be called n successive times.
+// It will fail on a random one of those calls
+// n must be greater than 0
+func FailRand(n int) {
+	if callIndexToFail < 0 {
+		return
+	}
+
+	if callRandIndexToFail < 0 {
+		// first call in the loop, pick a random index to fail at
+		callRandIndexToFail = rand.Intn(n)
+		callRandIndex = 0
+	}
+
+	if callIndex == callIndexToFail {
+		if callRandIndex == callRandIndexToFail {
+			Exit()
+		}
+	}
+
+	callRandIndex += 1
+
+	if callRandIndex == n {
+		callIndex += 1
+	}
+}
+
+func Exit() {
+	fmt.Printf("*** fail-test %d ***\n", callIndex)
+	proc, _ := os.FindProcess(os.Getpid())
+	proc.Signal(os.Interrupt)
+	//	panic(fmt.Sprintf("*** fail-test %d ***", callIndex))
+}

state/execution.go

@@ -4,9 +4,9 @@ import (
 	"fmt"
 	"time"
 
-	"github.com/ebuchman/fail-test"
 	abci "github.com/tendermint/tendermint/abci/types"
 	dbm "github.com/tendermint/tendermint/libs/db"
+	"github.com/tendermint/tendermint/libs/fail"
 	"github.com/tendermint/tendermint/libs/log"
 	"github.com/tendermint/tendermint/mempool"
 	"github.com/tendermint/tendermint/proxy"