hashKey()返回值为uint32强转成int,idx计算出来为负数，直接panic了 about graph HOT 5 CLOSED

@niean

from graph.

把你panic的日志，贴一下~~

from graph.

2015/06/01 23:10:55 cfg.go:80: read config file: cfg.json successfully
2015/06/01 23:10:55 db.go:58: makeDbConn root:Wxt130506@tcp(127.0.0.1:3306)/graph?loc=Local&parseTime=true
2015/06/01 23:10:55 db.go:27: g.InitDB, ok
2015/06/01 23:10:55 index.go:14: index:Start, ok
2015/06/01 23:10:55 rpc.go:53: rpc listening 0.0.0.0:6070
2015/06/01 23:10:55 http.go:87: http listening 0.0.0.0:6071
2015/06/01 23:10:55 main.go:23: 3281 register signal notify
panic: runtime error: index out of range

goroutine 20 [running]:
runtime.panic(0x82c7fa0, 0x8649e57)
/usr/lib/go/src/pkg/runtime/panic.c:266 +0x9a
github.com/open-falcon/graph/store.(_GraphItemMap).First(0x1891c360, 0x189cc8a0, 0x20, 0x0)
/opt/devops/open-falcon/src/github.com/open-falcon/graph/store/store.go:70 +0x12f
github.com/open-falcon/graph/api.handleItems(0x189cb160, 0x56, 0x56)
/opt/devops/open-falcon/src/github.com/open-falcon/graph/api/graph.go:59 +0x111
created by github.com/open-falcon/graph/api.(_Graph).Send
/opt/devops/open-falcon/src/github.com/open-falcon/graph/api/graph.go:27 +0x3f

goroutine 1 [chan receive]:
main.start_signal(0xcd1, 0x1891cd50, 0x28, 0x189008e8, 0x4, ...)
/opt/devops/open-falcon/src/github.com/open-falcon/graph/main.go:27 +0x1b5
main.main()
/opt/devops/open-falcon/src/github.com/open-falcon/graph/main.go:82 +0x2a0

goroutine 3 [syscall]:
runtime.goexit()
/usr/lib/go/src/pkg/runtime/proc.c:1394

from graph.

遍历测试，问题没有复现。可能跟环境有关。私聊下吧。

from graph.

32位golang，uint32强转int为32、存在溢出问题。已修改代码中的问题。

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